6th Class Science Changes Around us Question Bank

done Changes Around us Total Questions - 117

• question_answer1)
  Which of the following is a reversible change?
  A)
  Change of raw egg to boiled egg done clear
  B)
  Change of stretched rubber band to its normal size. done clear
  C)
  Change of bud to flower done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer2)
  Any change in which the original substance can be obtained by reversing conditions is known as a
  A)
  reversible change         done clear
  B)
  periodic change done clear
  C)
  physical change           done clear
  D)
  Both (a) and (c) done clear
  View Solution play_arrow

• question_answer3)
  The melting of wax is an example of
  A)
  physical change           done clear
  B)
  chemical change done clear
  C)
  reversible change         done clear
  D)
  Both (a) and (c) done clear
  View Solution play_arrow

• question_answer4)
  Burning of candle is a
  A)
  physical change           done clear
  B)
  chemical change done clear
  C)
  periodic change           done clear
  D)
  Both (a) and (b) done clear
  View Solution play_arrow

• question_answer5)
  When a woolen yam is knitted to get a sweater, the change can be classified as
  A)
  physical change      done clear
  B)
  chemical change done clear
  C)
  exothermic change done clear
  D)
  endothermic change done clear
  View Solution play_arrow

• question_answer6)
  The change of milk to curd, when we add a small quantity of curd to milk, can be classified as
  A)
  Fast change                 done clear
  B)
  slow change done clear
  C)
  periodic change           done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer7)
  Which of the following are endothermic change?
  A)
  Condensation and melting done clear
  B)
  Condensation and freezing done clear
  C)
  Evaporation and melting done clear
  D)
  Evaporation and freezing done clear
  View Solution play_arrow

• question_answer8)
  The change of bud to flower is a/an
  A)
  physical change           done clear
  B)
  reversible change done clear
  C)
  irreversible change       done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer9)
  Which of the following is a periodic change?
  A)
  Change of season done clear
  B)
  Phases of moon done clear
  C)
  Beating of human heart done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer10)
  A chemical change is one which occurs with
  A)
  the formation of new substances done clear
  B)
  the evolution or absorption of energy done clear
  C)
  Both the above done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer11)
  A change is called physical change because in it
  A)
  only change in physical properties takes place done clear
  B)
  transfer of energy takes place done clear
  C)
  can be easily reversed done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer12)
  Select the one that is a chemical change.
  A)
  rusting of iron done clear
  B)
  tearing of paper done clear
  C)
  Both of these    done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer13)
  Select a reversible change.
  A)
  milk to paneer done clear
  B)
  growth of a tree done clear
  C)
  cow-dung to biogas done clear
  D)
  ice-cream to molten ice cream done clear
  View Solution play_arrow

• question_answer14)
  Which one is a periodic change?
  A)
  Earth-quake done clear
  B)
  Formation of rainbow in sky done clear
  C)
  Occurrence of tides in seas done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer15)
  Select the one that represents a periodic change.
  A)
  Occurrence of tides done clear
  B)
  Opening of a morning glory flower done clear
  C)
  Both the above done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer16)
  The change of a ball of dough to a rolled out roti is a
  A)
  physical change           done clear
  B)
  chemical change done clear
  C)
  periodic change           done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer17)
  An aeroplane was cut out from a rectangular sheet of paper. The change involved is a
  A)
  physical change           done clear
  B)
  temporary change done clear
  C)
  irreversible change       done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer18)
  Which type of change takes place when a rolled roti is baked on taw a?
  A)
  physical change           done clear
  B)
  permanent change done clear
  C)
  periodic change           done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer19)
  What type of change is used for fixing a metal rim on a wooden wheel of a cart?
  A)
  physical change           done clear
  B)
  chemical change done clear
  C)
  Both the above done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer20)
  Heating of wax in a pan is a
  A)
  reversible change done clear
  B)
  irreversible change done clear
  C)
  permanent change done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer21)
  The dissolution of salt in water is a
  A)
  reversible change done clear
  B)
  irreversible change done clear
  C)
  chemical change done clear
  D)
  periodic change done clear
  View Solution play_arrow

• question_answer22)
  Select the one that is not a chemical change.
  A)
  dissolution of ammonia in water done clear
  B)
  dissolution of carbon dioxide in water done clear
  C)
  dissolution of oxygen in water done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer23)
  Which one is reversible change?
  A)
  melting of ice candy done clear
  B)
  cooking of food done clear
  C)
  ripening of mango done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer24)
  Cooking of an egg in boiling water containing salt is a                               
  A)
  permanent change done clear
  B)
  temporary change done clear
  C)
  irreversible change done clear
  D)
  Both (a) and (c) done clear
  View Solution play_arrow

• question_answer25)
  Condensation is a physical change, why?
  A)
  Vapour turns into liquid done clear
  B)
  No heat is required done clear
  C)
  It happens automatically done clear
  D)
  No new substance is formed done clear
  View Solution play_arrow

• question_answer26)
  Which of the following is a natural change?
  A)
  Cutting hair     done clear
  B)
           graying hair done clear
  C)
  Oiling hair      done clear
  D)
  colouring hair done clear
  View Solution play_arrow

• question_answer27)
  Choose the correct alternative to complete the given analogy. Physical change : Boiling : : Chemical change: _________
  A)
  Melting             done clear
  B)
           Burning done clear
  C)
  Condensing     done clear
  D)
  Evaporating done clear
  View Solution play_arrow

• question_answer28)
  Which of the following is a reversible change?
  A)
  Ripening of the fruit done clear
  B)
  Melting of ice done clear
  C)
  Burning of paper done clear
  D)
  Converting wood into saw dust done clear
  View Solution play_arrow

• question_answer29)
  What is difference between making of furniture from wood and burning of wood?              
  A)
  First is irreversible and second is reversible change      done clear
  B)
     First is physical and second is chemical change done clear
  C)
  First is fast and second is slow change done clear
  D)
  First is periodic and second is non-periodic change done clear
  View Solution play_arrow

• question_answer30)
  A change that results in formation of new substances and can't be reversed easily is know as a
  A)
  physical changes          done clear
  B)
  chemical changes done clear
  C)
  reversible changes        done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer31)
  A physical change is a
  A)
  is a temporary change done clear
  B)
  change in which no new substance is formed done clear
  C)
  reversible change done clear
  D)
  All the above are correct done clear
  View Solution play_arrow

• question_answer32)
  Evaporation is
  A)
  physical change done clear
  B)
  temporary change done clear
  C)
  a change in state of matter done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer33)
  A periodic change is a change
  A)
   that get repeated many a times in our life done clear
  B)
  that get repeated after a certain definite interval done clear
  C)
  that never get repeated done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer34)
  Exothermic change is
  A)
  accompanied by release of energy done clear
  B)
  accompanied by absorption of energy done clear
  C)
  a change in which heat energy is neither released nor absorbed done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer35)
  What happens to the metals on heating:
  A)
  They expand done clear
  B)
  They contract done clear
  C)
  They remains unaffected done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer36)
  Which of the following is not a man-made change?
  A)
  Burning of fuels done clear
  B)
  Change of day and night done clear
  C)
  Drying of clothes done clear
  D)
  Formation of curd from milk done clear
  View Solution play_arrow

• question_answer37)
  Which of the following is an example of chemical change?
  A)
  Filling up a balloon with hot air. done clear
  B)
  Taking a glass of water and freezing it by placing it in the freezer. done clear
  C)
  A plant collecting sunlight and turning it into food. done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer38)
  When a new substance is formed with different properties than the original substance it is called
  A)
  chemical change          done clear
  B)
  physical change done clear
  C)
  freezing                        done clear
  D)
  boiling done clear
  View Solution play_arrow

• question_answer39)
  If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a
  A)
  chemical change          done clear
  B)
  physical change done clear
  C)
  slow change                 done clear
  D)
  periodic change done clear
  View Solution play_arrow

• question_answer40)
  Which is an example of a physical change?
  A)
  Metal rusting    done clear
  B)
  Silver tarnishing done clear
  C)
  Water boiling   done clear
  D)
  Paper burning done clear
  View Solution play_arrow

• question_answer41)
  Which is an example of chemical change?
  A)
  Water freezes done clear
  B)
           Wood is cut done clear
  C)
  Bread is baked done clear
  D)
  Wire is bent done clear
  View Solution play_arrow

• question_answer42)
  Find the odd one out.
  A)
  crushing           done clear
  B)
  pulling done clear
  C)
  burning            done clear
  D)
  tearing done clear
  View Solution play_arrow

• question_answer43)
  Artificial ripening of fruit is a
  A)
  reversible change         done clear
  B)
  periodic change done clear
  C)
  irreversible change       done clear
  D)
  fast change done clear
  View Solution play_arrow

• question_answer44)
  Which of the following is a chemical change to a piece of paper?
  A)
  Colouring         done clear
  B)
  Burning done clear
  C)
  Folding                        done clear
  D)
  Tearing done clear
  View Solution play_arrow

• question_answer45)
  Choose the correct alternative to complete the given analogy. Change in period in a school: Periodic change::________: Non periodic change
  A)
  Heart beating done clear
  B)
  Formation of day and night done clear
  C)
  Forest fire done clear
  D)
  Change in phases of moon done clear
  View Solution play_arrow

• question_answer46)
  Find the odd one out.
  A)
  Cutting of nails done clear
  B)
  Breaking of glass done clear
  C)
  Formation of ash from paper done clear
  D)
  Tearing of paper done clear
  View Solution play_arrow

• question_answer47)
  During which of the following changes a new substance is formed?
  A)
  Cooking done clear
  B)
           Melting done clear
  C)
  Freezing                       done clear
  D)
  Crushing done clear
  View Solution play_arrow

• question_answer48)
  Physical changes are usually
  A)
  periodic changes done clear
  B)
  a change in state of matter done clear
  C)
  fast changes done clear
  D)
  a change in composition done clear
  View Solution play_arrow

• question_answer49)
  DIRECTIONS: Match column-I with Column-II and select the correct answer using the code given below the columns.

  Column-I	Column-II
  A. Melting	(p)Change of state from liquid to solid
  B. Condensation	(q) Change of state from liquid to gas
  C. Evaporation	(r) Change of state from solid to liquid
  D. Freezing	(s) Change of state from gas to liquid

  A)
  \[A\to (p),B\to (q),C\to (r),D\to (s)\] done clear
  B)
  \[A\to (s),B\to (r),C\to (q),D\to (p)\] done clear
  C)
  \[A\to (r),B\to (s),C\to (q),D\to (p)\] done clear
  D)
  \[A\to (q),B\to (p),C\to (s),D\to (r)\] done clear
  View Solution play_arrow

• question_answer50)
  DIRECTIONS: Match column-I with Column-II and select the correct answer using the code given below the columns.

  Column-I	Column-II
  A. Burning of carbon in air to produce carbon dioxide	(p) Endothermic change
  B. Melting of wax	(q) Exothermic change
  C. A change accompanied by absorption of heat	(r) Physical change
  D. A change accompanied by evolution of heat	(s) Chemical change

  A)
  \[A\to (s),B\to (q),C\to (p),D\to (r)\] done clear
  B)
  \[A\to (s),B\to (q),C\to (p),D\to (r)\] done clear
  C)
  \[A\to (r),B\to (s),C\to (q),D\to (p)\] done clear
  D)
  \[A\to (r),B\to (q),C\to (s),D\to (p)\] done clear
  View Solution play_arrow

• question_answer51)
  DIRECTIONS: Match column-I with Column-II and select the correct answer using the code given below the columns.

  Column-I	Column-II
  A. On heating iron rod	(p) It melts
  B. On cooling water vapour	(q) Expands
  C. On heating candle wax	(r) Salt and Sugar
  D. Dissolves easily in water	(s) It condenses

  A)
  \[A\to (q);B\to (s);C\to (p);D\to (r)\] done clear
  B)
  \[A\to (s),B\to (r),C\to (p),D\to (q)\] done clear
  C)
  \[A\to (r),B\to (s),C\to (q),D\to (p)\] done clear
  D)
  \[A\to (r),B\to (q),C\to (s),D\to (p)\] done clear
  View Solution play_arrow

• question_answer52)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage -1 For changing milk into curd we add a small quantity of curd into milk. The milk is stirred and is set aside for a few hours at a warm place. In a few hours the milk changes into curd. The change of milk into curd is a
  A)
  physical change           done clear
  B)
  chemical change done clear
  C)
  periodic change           done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer53)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage -1 For changing milk into curd we add a small quantity of curd into milk. The milk is stirred and is set aside for a few hours at a warm place. In a few hours the milk changes into curd. The change of milk into curd is a
  A)
  slow change     done clear
  B)
           fast change done clear
  C)
  exothermic                   done clear
  D)
  endothermic change done clear
  View Solution play_arrow

• question_answer54)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage -1 For changing milk into curd we add a small quantity of curd into milk. The milk is stirred and is set aside for a few hours at a warm place. In a few hours the milk changes into curd. Chemical changes are generally
  A)
  reversible change done clear
  B)
  irreversible change done clear
  C)
  periodic change done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer55)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 2 Sheetal once preparing evening tea. In the mean while telephone bellrangs and she rushed upto attend telephone call. She got busy on phone and sudden heard a sound from kitchen. When she enter back in kitchen. She saw that tea water was boiling with steal over it and cover of tea container is flew a side with water droplets over it. Why cover of tea kettle flew away?
  A)
  Not properly tight done clear
  B)
  Tea is explosive in nature done clear
  C)
  Pressure of steam done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer56)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 2 Sheetal once preparing evening tea. In the mean while telephone bellrangs and she rushed upto attend telephone call. She got busy on phone and sudden heard a sound from kitchen. When she enter back in kitchen. She saw that tea water was boiling with steal over it and cover of tea container is flew a side with water droplets over it. Water droplets on cover of tea container represents
  A)
  condensation done clear
  B)
           evaporation done clear
  C)
  melting             done clear
  D)
  freezing done clear
  View Solution play_arrow

• question_answer57)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 2 Sheetal once preparing evening tea. In the mean while telephone bellrangs and she rushed upto attend telephone call. She got busy on phone and sudden heard a sound from kitchen. When she enter back in kitchen. She saw that tea water was boiling with steal over it and cover of tea container is flew a side with water droplets over it. Steam over tea represents phenomena of
  A)
  Condensation done clear
  B)
           Boiling done clear
  C)
  Fusion              done clear
  D)
           None of these done clear
  View Solution play_arrow

• question_answer58)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below Assertion A: The explosion of a fire cracker sis a physical changes. Reason R: A physical change is a reversible change.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer59)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below Assertion A: The process of conversion of liquid water to its vapours by heating the liquid is called boiling. Reason R: The process of conversion of water vapours to liquid by cooling the vapours is called condensation.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer60)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below Assertion A: Burning of paper is a physical change. Reason R: The products formed on burning of paper cannot be easily converted back to paper.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer61)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below Assertion A: The formation of rust is a chemical change. Reason R: For the formation of rust iron must be exposed to air and water.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer62)
  DIRECTIONS: Read the following two statements carefully and choose the correct option. (i) Rusting of iron is a chemical change. (ii) The change of liquid water to ice on cooling is a reversible change.
  A)
  Statement (i) is correct while statement (ii) is in correct. done clear
  B)
  Statement (ii) is correct while statement (i) is incorrect. done clear
  C)
  Both statements are correct. done clear
  D)
  Both statements are incorrect. done clear
  View Solution play_arrow

• question_answer63)
  DIRECTIONS: Read the following two statements carefully and choose the correct option. (i) Change of liquid water to steam, on boiling, is an irreversible change. (ii) Beating of human heart is a non-periodic change.
  A)
  Statement (i) is correct while statement (ii) is in correct. done clear
  B)
  Statement (ii) is correct while statement (i) is incorrect. done clear
  C)
  Both statements are correct. done clear
  D)
  Both statements are incorrect. done clear
  View Solution play_arrow

• question_answer64)
  In the figures below the change occurring is a
  A)
  physical change           done clear
  B)
  chemical change done clear
  C)
  periodic change           done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer65)
  Carefully observe the figures below and choose the correct      
  A)
  Both the changes show in 'A? and 'B' are irreversible done clear
  B)
  Both the changes 'A' and 'B' are reversible done clear
  C)
  'A' is reversible but 'B' is irreversible done clear
  D)
  'A' is irreversible but 'B' is reversible done clear
  View Solution play_arrow

• question_answer66)
  Look at the picture given below. What kind of change is shown in the picture? Choose the correct option.
  A)
  Irreversible change, melted wax cannot be solidified again. done clear
  B)
  Reversible change, melted wax can be solidified again. done clear
  C)
  Periodic change, candle melts after an interval of an hour. done clear
  D)
  Chemical change, melting of candle wax results in change in composition of candle. done clear
  View Solution play_arrow

• question_answer67)
  DIRECTIONS: Look at the following diagram and answer the following question. Which of the following represents 'P'?
  A)
  Freezing of water into ice done clear
  B)
  Burning of coal       done clear
  C)
  Cooking of food done clear
  D)
  Bursting of cracker   done clear
  View Solution play_arrow

• question_answer68)
  DIRECTIONS: Look at the following diagram and answer the following question. Which of the following represents 'Q? in the above diagram?
  A)
  Crushing of ice done clear
  B)
  Cooking of food              done clear
  C)
  Explosion of a bomb done clear
  D)
  Melting of ice      done clear
  View Solution play_arrow

• question_answer69)
  The burning of magnesium in air is accompanied by production of heat and light. This can be classified as
  A)
  physical and exothermic change done clear
  B)
  chemical and exothermic change done clear
  C)
  physical and endothermic change done clear
  D)
  chemical and endothermic change done clear
  View Solution play_arrow

• question_answer70)
  To fix up the fractured bone a paste made of plaster of parts (POP) is used as a coating over the bandage on the fractured bone. After some time the plaster becomes hard and dry. This change in POP can be classified
  A)
  physical change done clear
  B)
  permanent change done clear
  C)
  change of state of mater done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer71)
  Consider the following changes and select the option that can be used to classify these. stretching of rubber band cooking of food heating of milk stretching of spring burning of paper
  A)
  periodic and non-periodic change done clear
  B)
  physical and chemical change done clear
  C)
  expansion and contraction done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer72)
  A list of changes is given below. Identify their type and choose correct option. Boiling of egg. Making curd from milk Flowering of bud Making flour from grain
  A)
  (i), (ii), (iii) and (iv) are irreversible changes done clear
  B)
  and (iv) are chemical changes done clear
  C)
  (i), (ii), and (iv) are natural changes done clear
  D)
  (ii), (iii) and (iv) are periodic changes done clear
  View Solution play_arrow

• question_answer73)
  In an experiment the following changes were observed, (i) It was accompanied by change in colour (ii) It was accompanied by a change in temperature (iii) It was accompanied by a change in energy. The change involved can be classified as a
  A)
  periodic change           done clear
  B)
  non-periodic change done clear
  C)
  physical change done clear
  D)
  chemical change done clear
  View Solution play_arrow

• question_answer74)
  The melting of gold is a physical change because
  A)
  melted gold is still gold but in different form done clear
  B)
  no new substance is formed in it done clear
  C)
  on cooling melted gold returns back to its original state done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer75)
  Why is spoiling of food considered a chemical change?
  A)
  In it the food changes from one chemical substance to another done clear
  B)
  It is not possible to get original food from spoiled food done clear
  C)
  It is a permanent change done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer76)
  Why is earthquake considered a non-periodic change?
  A)
  Its occurrence is possible at any time. done clear
  B)
  It occurs rarely at some places. done clear
  C)
  It occurs only in certain quake prone areas. done clear
  D)
  None of above done clear
  View Solution play_arrow

• question_answer77)
  Anaerobic bacteria digest animal waste and produce biogas (change-A). The biogas is then burnt as fuel (change-B). The following statements pertain to these changes. Choose the correct one.
  A)
  Process A is a chemical change done clear
  B)
  Process B is a chemical change done clear
  C)
  Both processes A and B are chemical changes done clear
  D)
  None of these processes is a chemical change. done clear
  View Solution play_arrow

• question_answer78)
  If few drops of petroleum are poured on your palm, you feel cool as the petrol evaporates. This change is
  A)
  slow change done clear
  B)
  chemical reaction done clear
  C)
  endothermic change   done clear
  D)
  periodic change done clear
  View Solution play_arrow

• question_answer79)
  Which of the following is an example of physical change?
  A)
  Mixing baking soda and vinegar together, and this causes bubbles and foam. done clear
  B)
  A glass cup falls from the counter and shatters on the ground. done clear
  C)
  Lighting a piece of paper on fire and the paper bums up and leaves ashes. done clear
  D)
  Baking a birthday cake for your mother.    done clear
  View Solution play_arrow

• question_answer80)
  Find the odd one out.
  A)
  respiration       done clear
  B)
           digestion done clear
  C)
  photosynthesis done clear
  D)
  freezing done clear
  View Solution play_arrow

• question_answer81)
  What new material is formed when a candle burns?
  A)
  Melted wax     done clear
  B)
           Water vapour done clear
  C)
  Carbon dioxide done clear
  D)
          Both (b) and (c) done clear
  View Solution play_arrow

• question_answer82)
  In which of the following cases is heat energy released? When ice melts When water freezes to ice When water vapour condenses into liquid water When water evaporate into water vapours
  A)
  A, B and C      done clear
  B)
  B, C and D done clear
  C)
  B and C           done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer83)
  Ramesh wants to buy a clay pot. For which he went to a potter. Ramesh asked potter to make Z pot of his desired design, shape and size. Will potter be able to do this? This is an example of which kind of change?
  A)
  Yes, physical change done clear
  B)
  Yes, chemical change done clear
  C)
  No, physical change done clear
  D)
  No, chemical change done clear
  View Solution play_arrow

• question_answer84)
  Peeled and unpeeled banana doesn't look same Does that means peeling banana is a chemical change?
  A)
  No, we just separated skin of banana and there is no change in is composition. done clear
  B)
  Yes, through peeling a new product is formed. done clear
  C)
  Yes, both chemical and physical change happen here done clear
  D)
  No, neither chemical nor physical change happen here.       done clear
  View Solution play_arrow

• question_answer85)
  Do you think we break molecules when we turn chalk into chalk powder? 
  A)
  Yes, chalk powder is formed by breaking chalk into small pieces.                   done clear
  B)
  Yes, because formation of chalk powder is a chemical change. done clear
  C)
  No because no new substance is formed molecules of chalk and chalk powder are same.     done clear
  D)
  Yes, because chalk is bigger in size than particles of chalk powder. done clear
  View Solution play_arrow

• question_answer86)
  Which of the following are examples of chemical changes? Cutting of wood Burning of wood Baking of cake   Growth in plants and animals                     
  A)
  A and D           done clear
  B)
  B and C               done clear
  C)
  A, B and C      done clear
  D)
  B, C and D      done clear
  View Solution play_arrow

• question_answer87)
  Charcoal burning on the grill is an example of           
  A)
  physical change           done clear
  B)
  chemical change             done clear
  C)
  periodic change done clear
  D)
  reversible change            done clear
  View Solution play_arrow

• question_answer88)
  During burning of paper which of the following acts as reactant?
  A)
  Flame              done clear
  B)
           Ash done clear
  C)
  Paper               done clear
  D)
           None of these done clear
  View Solution play_arrow

• question_answer89)
  Find the odd one out.
  A)
  Permanent change done clear
  B)
  Reversible done clear
  C)
  Change in composition done clear
  D)
  Formation of new substance done clear
  View Solution play_arrow

• question_answer90)
  A very hot glass on putting under cold water cracks. This change is due to _______.
  A)
  expansion        done clear
  B)
           contraction done clear
  C)
  formation of new substance done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer91)
  DIRECTIONS: Match Column-I with column ?II and select the correct answer using the codes given below the column.

  Column-I	Column-II
  A. Formation of day and night	(p) Chemical change
  B. Ripening of a mango	(q) Physical change
  C. Dissolving of sugar in water	(r) Periodic change
  D. Occurrence of rainbow	(s) Non-periodic change

  A)
  \[A\to (p),B\to (r),C\to (q),D\to (s)\] done clear
  B)
  \[A\to (q),B\to (r),C\to (p),D\to (r)\] done clear
  C)
  \[A\to (r),B\to (q),C\to (s),D\to (p)\] done clear
  D)
  \[A\to (r),B\to (p),C\to (q),D\to (s)\] done clear
  View Solution play_arrow

• question_answer92)
  DIRECTIONS: Match Column-I with column ?II and select the correct answer using the codes given below the column.

  Column-I	Column-II
  A. The process of photosynthesis	(p) This process involves reversible and irreversible process respectively
  B. Change in phases of moon	(q) This process involves presence of sunlight
  C. Candle wax melts and bums at same time	(r)This is the process which involves physical and chemical change respectively
  D. Cutting wood for furniture and burning of wood	(s) This process occur after a fixed interval of time

  A)
  \[A\to (s),B\to (q),C\to (p),D\to (r)\] done clear
  B)
  \[A\to (q),B\to (s),C\to (p),D\to (r)\] done clear
  C)
  \[A\to (p),B\to (s),C\to (q),D\to (r)\] done clear
  D)
  \[A\to (s),B\to (p),C\to (q),D\to (r)\] done clear
  View Solution play_arrow

• question_answer93)
  DIRECTIONS: Match Column-I with column ?II and select the correct answer using the codes given below the column.

  Column-I	Column-II
  A. Crushing of an ice cube	(p) periodic change
  B. Making of curd	(q) Slow change
  C. Germination of seed into plant	(r) Physical change
  D. Formation of day and night	(s) Chemical change

  A)
  \[A\to (s),B\to (r),C\to (q),D\to (p)\] done clear
  B)
  \[A\to (r),B\to (s),C\to (q),D\to (p)\] done clear
  C)
  \[A\to (s),B\to (r),C\to (p),D\to (q)\] done clear
  D)
  \[A\to (r),B\to (p),C\to (q),D\to (s)\] done clear
  View Solution play_arrow

• question_answer94)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 1 Copper statues exposed to carbon dioxide and water in the air become coated with patina. The patina is not copper, it is not carbon dioxide, and not water. It is a new substance formed by the reaction of these chemicals with one another. The appearance of patina on copper statues when these are exposed to moist air is which type of change?
  A)
  Physical change done clear
  B)
  Chemical change done clear
  C)
  Periodic change done clear
  D)
  Non-periodic change done clear
  View Solution play_arrow

• question_answer95)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 1 Copper statues exposed to carbon dioxide and water in the air become coated with patina. The patina is not copper, it is not carbon dioxide, and not water. It is a new substance formed by the reaction of these chemicals with one another. The change described above is a
  A)
  reversible change done clear
  B)
  irreversible change done clear
  C)
  expansion done clear
  D)
  contraction done clear
  View Solution play_arrow

• question_answer96)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 1 Copper statues exposed to carbon dioxide and water in the air become coated with patina. The patina is not copper, it is not carbon dioxide, and not water. It is a new substance formed by the reaction of these chemicals with one another. The change of copper to patina as described above is a
  A)
  fast change done clear
  B)
  slow change done clear
  C)
  exothermic change done clear
  D)
  endothermic change done clear
  View Solution play_arrow

• question_answer97)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 2 What is the term used to describe the phase change of a liquid to a gas?
  A)
  Boiling             done clear
  B)
           Condensation done clear
  C)
  Melting                         done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer98)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 2 What term is used to describe the phase change of a solid to a liquid?
  A)
  Freezing           done clear
  B)
           Melting done clear
  C)
  Boiling                         done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer99)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 2 What is the term used to describe the phase change as a liquid becomes a solid?
  A)
  Evaporation    done clear
  B)
           Condensation done clear
  C)
  Freezing           done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer100)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 3 Which of the following represents ?A??
  A)
  Solar eclipse done clear
  B)
  Formation of rainbow done clear
  C)
  Occurrence of season done clear
  D)
  both (a) and (c) done clear
  View Solution play_arrow

• question_answer101)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 3 Which of the following represents ?D??
  A)
  Making tea done clear
  B)
  Burning of sulphur done clear
  C)
  Dissolving salt in water done clear
  D)
  Burning of coal done clear
  View Solution play_arrow

• question_answer102)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 3 Which of the following represent ?C??
  A)
  Solar eclipse done clear
  B)
  Raining done clear
  C)
  Formation of rainbow done clear
  D)
  Growth of a plant done clear
  View Solution play_arrow

• question_answer103)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 4 Mohan was boiling water in a pan for making tea. His brother Ram came there and observed that during boiling of water some bubbles are formed. He told his brother Mohan that boiling of water is a chemical change as gas is evolved in this process. But Mohan argued that this is not a chemical change. Do you agree with Mohan? What kind of change is this?
  A)
  Yes, physical change done clear
  B)
  No, chemical change done clear
  C)
  No, irreversible change done clear
  D)
  No, Periodic change done clear
  View Solution play_arrow

• question_answer104)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 4 Mohan was boiling water in a pan for making tea. His brother Ram came there and observed that during boiling of water some bubbles are formed. He told his brother Mohan that boiling of water is a chemical change as gas is evolved in this process. But Mohan argued that this is not a chemical change. According to you what is the gas that is observed by Ram?
  A)
  Oxygen            done clear
  B)
           Water vapours done clear
  C)
  Carbon dioxide done clear
  D)
          No gas is formed done clear
  View Solution play_arrow

• question_answer105)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 4 Mohan was boiling water in a pan for making tea. His brother Ram came there and observed that during boiling of water some bubbles are formed. He told his brother Mohan that boiling of water is a chemical change as gas is evolved in this process. But Mohan argued that this is not a chemical change. What kind of change takes place after formation of tea?
  A)
  Physical change           done clear
  B)
  Chemical change done clear
  C)
  Reversible change        done clear
  D)
  Both  and done clear
  View Solution play_arrow

• question_answer106)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 5 Ravi and Tina were working on a project based on' changes around us?, for which they were observing different changes occurring in their daily life. They went to kitchen where they saw there mother was cooking food on LPG stove. Ravi said that burning of LPG in LPG stove involves chemical change. But Tina argued that both physical and chemical changes are involved this process. According to you what is the physical change involved as mentioned by Tina?
  A)
  Burning of LPG gas done clear
  B)
  Conversion of liquid form of LPG into gaseous form. done clear
  C)
  Cooking of food done clear
  D)
  There is no physical change done clear
  View Solution play_arrow

• question_answer107)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 5 Ravi and Tina were working on a project based on' changes around us?, for which they were observing different changes occurring in their daily life. They went to kitchen where they saw there mother was cooking food on LPG stove. Ravi said that burning of LPG in LPG stove involves chemical change. But Tina argued that both physical and chemical changes are involved this process. Burning of LPG gas is which kind of change?
  A)
  Chemical change         done clear
  B)
  Physical change done clear
  C)
  Periodic change           done clear
  D)
  Reversible change done clear
  View Solution play_arrow

• question_answer108)
  DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 5 Ravi and Tina were working on a project based on' changes around us?, for which they were observing different changes occurring in their daily life. They went to kitchen where they saw there mother was cooking food on LPG stove. Ravi said that burning of LPG in LPG stove involves chemical change. But Tina argued that both physical and chemical changes are involved this process. Which one of the following examples in volves both chemical and physical changes?
  A)
  Cutting of wood done clear
  B)
  Melting of ice done clear
  C)
  Burning of a candle done clear
  D)
  Burning of paper done clear
  View Solution play_arrow

• question_answer109)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion A: Respiration is an exothermic process. Reason R: In an exothermic process heat is evolved.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer110)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion A: The change of water from liquid to steam on heating is a physical change. Reason R: Conversion of liquid into steam is called evaporation.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer111)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion A: Explosion of a bomb is an exothermic change. Reason R: Large amount of heat energy is released during explosion of bomb.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer112)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion A: Small gap is left between the rails of a railway track. Reason R: Cooling of substances result in contraction.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer113)
  DIRECTIOS: Read the following three statements carefully and choose the correct option. (i) A physical change is one in which the substance undergoing change is not destroyed and no new substance is formed. (ii) Glowing of an electric bulb is a physical change. (iii) When antacid tablet is dropped in water, it fizzes. This is a chemical change.
  A)
  Statements (i) and (iii) are in correct but (ii) is correct. done clear
  B)
  Statements (i) and (ii) are in correct but (iii) is correct. done clear
  C)
  All three statements are correct. done clear
  D)
  All three statements are in correct. done clear
  View Solution play_arrow

• question_answer114)
  DIRECTIOS: Read the following three statements carefully and choose the correct option. (i)  Turning off of a bulb is a irreversible change (ii) When the leaves of the touch-me-not plant is touched, they close. This is an reversible change. (iii) Ripening of fruits is a reversible change as we can get unriped fruit from riped one.
  A)
  Statements (i) and (iii) are in correct but (ii) is correct. done clear
  B)
  Statements (i) and (ii) are in correct but (iii) is correct. done clear
  C)
  All three statements are correct. done clear
  D)
  All three statements are in correct. done clear
  View Solution play_arrow

• question_answer115)
  Carefully observe the figures A and B below and choose the correct option. A. B.
  A)
  Both 'A' and 'B' are periodic changes done clear
  B)
  Both 'A' and ' B ' are non-periodic change done clear
  C)
  'A' is periodic and 'B' is non-periodic change done clear
  D)
  'B' is periodic and 'A' is non-periodic change done clear
  View Solution play_arrow

• question_answer116)
  The picture given below represents a chemical process On the basis of given figure choose the correct option.
  A)
  Reactant\[\to \] Bicarbonate of soda, Product\[\to \]Vinegar done clear
  B)
  Reactant \[\to \]Vinegar, Product \[\to \] Carbon dioxide done clear
  C)
  Reactant\[\to \]Vinegar, Product \[\to \]Bicarbonate of soda and carbon dioxide done clear
  D)
  Reactant\[\to \] Vinegar, Bicarbonate of soda, product \[\to \]Carbon dioxide done clear
  View Solution play_arrow

• question_answer117)
  Look at the following figures and choose the correct option. (i) (ii) (iii) (iv) (v)
  A)
  (i), (ii) and (iii) represent exothermic change done clear
  B)
  (ii), (iv) and (v) represent endothermic change done clear
  C)
  (i), (iii) and (v) represent exothermic change done clear
  D)
  only (ii) and (iv) represent endothermic change done clear
  View Solution play_arrow