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question_answer1)
Which of the following' is incorrect about physical changes?
A)
No new substance is formed. done
clear
B)
Are reversible changes. done
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C)
Change in size is a physical change. done
clear
D)
Are irreversible changes. done
clear
E)
None of these done
clear
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question_answer2)
Rusting of iron is an example of:
A)
Reversible change done
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B)
Irreversible change done
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C)
Physical change done
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D)
No change done
clear
E)
None of these done
clear
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question_answer3)
Raghu in his craft class is making beads by using POP (plaster of paris). The setting of beads by using water is a/an:
A)
Physical change done
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B)
Reversible change done
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C)
Irreversible change done
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D)
No change done
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E)
None of these done
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question_answer4)
The energy required to start a chemical reaction is known as:
A)
Kinetic energy done
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B)
Activation energy done
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C)
Potential energy done
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D)
Magnetic energy done
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E)
None of these done
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question_answer5)
Which among the following is not an example of a reversible change?
A)
Dissolving sugar in water. done
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B)
Changing of wheat to flour. done
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C)
Folding up of a paper. done
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D)
Melting of coaltar. done
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E)
None of these done
clear
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question_answer6)
Name the gas which is produced when washing soda reacts with lemon juice.
A)
Oxygen done
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B)
Nitrogen done
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C)
Argon done
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D)
Carbon dioxide done
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E)
None of these done
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question_answer7)
The brown coloured deposition on an iron box when kept in humid air for some days is called:
A)
Dust done
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B)
Rust done
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C)
Argon done
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D)
All the above done
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E)
None of these done
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question_answer8)
Softening of iron on heating is:
i. Reversible change |
ii. Chemical change |
iii. Physical change |
iv. Irreversible change |
Which of the following is correct for the above statement?
A)
i and iii done
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B)
ii and iii done
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C)
i and iv done
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D)
iii and iv done
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E)
None of these done
clear
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question_answer9)
Which of the following is an example of periodic change?
A)
Occurrence of earthquake done
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B)
Heartbeat done
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C)
A car accident done
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D)
Landslide done
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E)
None of these done
clear
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question_answer10)
Which among the following is an irreversible change?
A)
Melting of ice. done
clear
B)
Formation of flower from bud. done
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C)
Heating of milk. done
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D)
Kicking a football. done
clear
E)
None of these done
clear
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question_answer11)
Which change among the following changes is not included in a reversible change?
A)
Change it state. done
clear
B)
Change of position. done
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C)
Change in internal structure. done
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D)
Change of colour. done
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E)
None of these done
clear
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question_answer12)
A substance present in plants which itself does not undergo any change but helps in changing water and carbon dioxide into food.
A)
Flower done
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B)
Bud done
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C)
Leaf done
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D)
Chlorophyll done
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E)
None of these done
clear
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question_answer13)
While making chapati, Radhika observed the following changes, which among the following is a reversible change?
A)
Changing of flour into dough. done
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B)
Rolling of chapati. done
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C)
Baking of chapati. done
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D)
Eating a chapati. done
clear
E)
None of these done
clear
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question_answer14)
Name the substance which initiates a chemical reaction.
A)
Products done
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B)
Reactants done
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C)
Inhibitors done
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D)
Catalysts done
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E)
None of these done
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question_answer15)
Match the following on the basis of given chemical reaction: \[6C{{O}_{2}}+6{{H}_{2}}O\xrightarrow[Chlorophyll]{Sunlight}{{C}_{6}}{{H}_{12}}{{O}_{6}}+6{{O}_{2}}\]
Column A | Column B |
(i) | \[C{{O}_{2}}\] | [A] | Product |
(ii) | Chlorophyll | [B] | Photosynthesis |
(iii) | \[{{O}_{2}}\] | [C] | Reactant |
(iv) | Process | [D] | Catalyst |
A)
(i-D), (ii-C), (iii-A), (iv-B) done
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B)
(i-B), (ii-D), (iii-C), (iv-A) done
clear
C)
(i-C), (ii-D), (iii-A), (iv-B) done
clear
D)
(i-C), (ii-B), (iii-D), (iv-A) done
clear
E)
None of these done
clear
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question_answer16)
Iron blade of spade is made slightly smaller than the wooden handle because:
A)
Iron ring contracts on heating. done
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B)
Iron ring expands on heating. done
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C)
Iron ring remains the same on heating. done
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D)
Wooden handle expands on heating. done
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E)
None of these done
clear
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question_answer17)
Which among the following is an irreversible change?
A)
Ageing of man. done
clear
B)
Making cheese from milk. done
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C)
Burning of incense stick. done
clear
D)
All the above done
clear
E)
None of these done
clear
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question_answer18)
Which pair among the following are the reversible change?
A)
Melting of wax and burning of wax. done
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B)
Melting of ice and freezing of ice. done
clear
C)
Rolling a roti and baking a roti. done
clear
D)
Folding of paper and burning of paper. done
clear
E)
None of these done
clear
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question_answer19)
Which of the following cannot be reversed?
A)
Boiling of an egg. done
clear
B)
Folding of paper. done
clear
C)
Knitting of sweater. done
clear
D)
Melting of wax. done
clear
E)
None of these done
clear
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question_answer20)
The change which can be reversed.
A)
Chemical change done
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B)
Physical change done
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C)
Both [a] and [b] done
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D)
Either [a] or [b] done
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E)
None of these done
clear
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question_answer21)
Which among the following is a characteristic of physical change?
A)
Involvement of great amount of heat energy. done
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B)
Change in states. done
clear
C)
Change in chemical composition. done
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D)
Formation of a new substance done
clear
E)
None of these done
clear
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question_answer22)
The process in which iron is covered with a brown layer due to moisture and oxygen is called
A)
Evaporation done
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B)
Condensation done
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C)
Rusting done
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D)
Burning done
clear
E)
None of these done
clear
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question_answer23)
When water freezes to ice:
A)
Heat energy is absorbed. done
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B)
Heat energy is given out. done
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C)
Both [a] and [b] done
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D)
Either [a] or [b] done
clear
E)
None of these done
clear
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question_answer24)
Making of curd from milk is which kind of change?
A)
Unwanted change done
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B)
Reversible change done
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C)
Irreversible change done
clear
D)
No change done
clear
E)
None of these done
clear
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question_answer25)
______ is a substance in a chemical reaction which does not undergo any change but helps in increasing the rate of chemical reaction.
A)
Reactant done
clear
B)
Product done
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C)
Inhibitor done
clear
D)
Catalyst done
clear
E)
None of these done
clear
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question_answer26)
When cold water is poured over the hot iron rim in a wooden wheel:
A)
It expands. done
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B)
It contracts. done
clear
C)
It remains same. done
clear
D)
All the above done
clear
E)
None of these done
clear
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question_answer27)
In general, metals:
A)
Expand on heating done
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B)
Contract on heating done
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C)
Are not affected by heating done
clear
D)
All the above done
clear
E)
None of these done
clear
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question_answer28)
Which of the following is not required in the process of rusting?
A)
Water done
clear
B)
Oxygen done
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C)
Iron done
clear
D)
All the above done
clear
E)
None of these done
clear
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question_answer29)
Which of the following can be considered as a fast change?
A)
Growth of child done
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B)
Germination of seed done
clear
C)
Bursting of cracker done
clear
D)
Cooking of food done
clear
E)
None of these done
clear
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question_answer30)
When carbon dioxide and water combines they form glucose, this is an example of _____ change.
A)
Physical done
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B)
Chemical done
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C)
Reversible done
clear
D)
Undesirable done
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E)
None of these done
clear
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question_answer31)
Inflating a balloon is a/an _____ change.
A)
Irreversible done
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B)
Chemical done
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C)
Reversible done
clear
D)
Periodic done
clear
E)
None of these done
clear
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question_answer32)
Which among the following is a reversible change?
A)
Growth in plants and animals. done
clear
B)
Burning of cloth. done
clear
C)
Cooking of food. done
clear
D)
Bursting a balloon done
clear
E)
None of these done
clear
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question_answer33)
Which among the following is incorrect statement?
A)
Rusting of iron is irreversible change. done
clear
B)
Ripening of fruits is a chemical change. done
clear
C)
Breaking of glass is a reversible change. done
clear
D)
All the above done
clear
E)
None of these done
clear
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question_answer34)
Exothermic changes are changes in which:
A)
Heat is absorbed. done
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B)
Heat is liberated. done
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C)
Both [a] and [b] done
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D)
Either [a] or [b] done
clear
E)
None of these done
clear
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question_answer35)
Sawing a piece of wood is which kind of change?
A)
Reversible change done
clear
B)
Irreversible change done
clear
C)
Chemical change done
clear
D)
Periodic change done
clear
E)
None of these done
clear
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question_answer36)
Which kind of change it will be, if a sac of cement gets wet completely and left in open?
A)
Irreversible change done
clear
B)
Reversible change done
clear
C)
Biological change done
clear
D)
Desirable change done
clear
E)
None of these done
clear
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question_answer37)
Making biogas from cow-dung is which kind of change?
A)
Irreversible change done
clear
B)
Reversible change done
clear
C)
Both [a] and [b] done
clear
D)
Either [a] or [b] done
clear
E)
None of these done
clear
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question_answer38)
Spilled water on the table when evaporates, the process involves:
A)
Releasing of heat done
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B)
Absorption of heat done
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C)
Both [a] and [b] done
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D)
Either [a] or [b] done
clear
E)
None of these done
clear
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question_answer39)
Expansion of iron on heating is which kind of change?
A)
Chemical done
clear
B)
Desirable done
clear
C)
Reversible done
clear
D)
Both [b] and [c] done
clear
E)
None of these done
clear
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question_answer40)
The new substance formed during or after a chemical reaction is:
A)
Catalyst done
clear
B)
Inhibitor done
clear
C)
Product done
clear
D)
Reactant done
clear
E)
None of these done
clear
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