# 7th Class Science Heat Question Bank

### done Heat

• A) always from hotter body to a cooler body

B) always from cooler body to a hotter body.

C) always from a body at a lower temperature to a body at higher temperature

D) All of the above

• A) Stethoscope

B) Clinical thermometer

C) Laboratory thermometer

D) None of these

• A) Celsius

B) Farenheit

C) Both (a) and (b)

D) None of these

• A) $35{}^\circ C$

B) $37{}^\circ C$

C) $39{}^\circ C$

D) None of these

• A) solids

B) liquids

C) gases

D) All of these

• A) Conduction

B) Convection

D) All of these

• A) ultra violet rays

B) infra-red rays

C) X-rays

D) gamma rays

• A) Wood

B) Plastic

C) Aluminium

D) None of these

• A) cold air moves from sea towards land during day time

B) hot air moves from sea towards land during day time

C) cold air moves from land towards sea during day time

D) None of the above is correct

• A) cold air moves from sea towards land during night.

B) hot air moves from sea towards land during night.

C) cold air moves from land towards sea during night.

D) None of the above is correct

• A) high fluidity

B) high density

C) high conductivity

D) high specific heat

• A) sand radiates heat less quickly as compared to earth

B) the sky is generally clear

C) sand radiates heat more quickly as compared to earth

D) the sky is generally cloudy.

• A) wood

B) paper

C) plastic

D) metal

• A) Boiling point of water is $212{}^\circ F$

B) The temperature will be equal to that on the Celsius scale at $-40{}^\circ C$

C) The difference between the upper fixed point and the lower fixed point is divided into 180 equal parts

D) All of the above

• A) nature of the substance

B) rise in temperature

C) both A and B

D) color of the substance

• A) On heating glass expands and lid contracts

B) Lid expands more than the neck and thus slides easily

C) Neck becomes slippery on heating

D) Lids of the bottles cannot bear the heat

• A) freezing

B) sublimation

C) boiling

D) condensation

• A) gained by the hotter body will be equal to the heat lost by the colder body

B) the heat gained by the hotter body will be less than the heat lost by the colder body

C) the heat gained by the hotter body will be greater than the heat lost by the colder body

D) the heat lost by the hotter body will be equal to the heat gained by the colder body.

• A) conduction

B) convection

D) yet to be found

• A) when the bodies are apart from each other

B) when the bodies have same temperature and in thermal contact

C) when they have different temperatures maintaining distance between them

D) bodies should be in contact and should have different temperatures

• A) metals are good conductors

C) metals are expensive

D) None of the above

• A) Temperature is a measure of total amount of heat contained in an object.

B) Temperature is a measure of degree of hotness or coldness of a body.

C) Both the above are correct

D) None of the above is correct

• A) heat

B) temperature

C) Both of these

D) None of these

• A) air breeze

B) sea breeze

C) land breeze

D) None of these

• A) Copper bottom makes the pan more durable

B) Copper bottom makes the pan appear beautiful

C) Copper is a better conductor of heat than steel

D) Copper can be cleaned more easily as compared to steel

• A) White color is good reflector. So the heat falling on the wall gets reflected and wall is not heated

B) White makes the wall look beautiful

C) Other colors will be expensive

D) None of the above

• A) Heat is a measure of temperature.

B) Heat is a form of potential.

C) It is form of energy which gets transferred from a hot to a cold body.

D) None of the above.

• A) Fahrenheit and Celsius

B) Celsius and Kelvin

C) Kelvin and Platinum

D) None of these

• A) Celsius

B) Fahrenheit

C) Reamer

D) Kelvin

• A) Calorie

B) Calorie

C) Joule

D) none of the above

• A) More is the rate of flow of heat from a body at a higher temperature to a body at lower temperature.

B) More is the rate of flow of heat from a body at a lower temperature to a body at higher temperature.

C) There is no change in the rate of flow of heat

D) None of the above

• A) during day time only

B) during night time only

C) throughout the day and night

D) none of the above

• A) Conduction only

B) Convection only

C) Conduction and convection only

• A) Thermometer

B) Clinical thermometer

C) Laboratory thermometer

D) None of these

• A) Conduction

B) Convection

D) all of these

• A) Cold air that moves from sea towards land during night time.

B) Cold air that moves from sea towards land during day time.

C) Both the above.

D) None of the above.

• A) $1{}^\circ C$

B) $2{}^\circ C$

C) $3{}^\circ C$

D) $4{}^\circ C$

• A) a metal

B) a non-metal

C) neither a metal nor a non-metal

D) none of the above is correct

• A) Wood

B) Plastic

C) Both of these

D) None of these

•  Column-I Column-II (A) Summer (p) Land breeze blows (B) Winter (q) Sea breeze blows (C) Day (r) Dark colored clothes are preferred (D) Night (s) Light colored clothes are preferred

A) A$\to$ (s), B$\to$ (r), C$\to$ (q), D$\to$ (p)

B) A$\to$ (p), B$\to$ (q), C$\to$ (r), D$\to$ (s)

C) A$\to$ (q), B$\to$ (p), C$\to$ (r), D$\to$ (s)

D) A$\to$ (r), B$\to$ (s), C$\to$ (p), D$\to$ (q)

•  Column - I (Transfer of heat) Column - II (Medium) (A) Conduction (p) Black surface (B) Convection (q) Vacuum (C) Radiation (r) Air (D) Absorption (s) A solid medium

A) A$\to$ (r), B$\to$ (s), C$\to$ (p), D$\to$ (q)

B) A$\to$ (r), B$\to$ (s), C$\to$ (p), D$\to$ (q)

C) A$\to$ (s), B$\to$ (r), C$\to$ (q), D$\to$ (p)

D) A$\to$ (s), B$\to$ (p), C$\to$ (r), D$\to$ (q)

•  Column - I Column - II (A) Clinical thermo-meter (p) Kink (B) Laboratory thermometer (q) Scale marked in ${}^\circ C$ (C) Steel (r) Good conductor (D) Plastic (s) Bad conductor

A) A$\to$ (p), B$\to$ (q), C$\to$ (r), D$\to$ (s)

B) A$\to$ (q), B$\to$ (p), C$\to$ (r), D$\to$ (s)

C) A$\to$ (q), B$\to$ (p), C$\to$ (s), D$\to$ (r)

D) A$\to$ (p), B$\to$ (q), C$\to$ (s), D$\to$ (r)

• A) $35{}^\circ C$

B) $36{}^\circ C$

C) $37{}^\circ C$

D) $39{}^\circ C$

• A) To keep the mercury within the range of $35{}^\circ C$-$42{}^\circ C$

B) To allow the temperature reading to remain unchanged after the use of temperature until a jerk is given.

C) To make the thermometer size smaller.

D) All of the above are correct.

• A) It should be washed before use.

B) It should be washed after use.

C) It should be washed preferably with some antiseptic.

D) All the above.

• A) The hand that was kept above the flame.

B) The hand that was kept on the side of the flame.

C) Both hands feel equally hot.

D) None of these is correct.

• A) Conduction

B) convection

D) none of these

• A) The air near the heat source gets hot and rises.

B) The air from sides comes to take its place.

C) In this way air gets heated.

D) All the above are correct.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Statement (1) is correct while statement (2) is incorrect.

B) Statement (2) is correct while statement (1) is incorrect.

C) Both statements are correct

D) Both statements are incorrect.

• A) Statement (1) is correct while statement (2) is incorrect.

B) Statement (2) is correct while statement (1) is incorrect.

C) Both statements are correct

D) Both statements are incorrect.

• A) (i)

B) (ii)

C) (iii)

D) (iv)

• A) conduction only

B) conduction and convection

• A) A

B) B

C) C

D) D

• A) $80{}^\circ C$

B) more than $50{}^\circ C$ but less than $80{}^\circ C$

C) $20{}^\circ C$

D) between $30{}^\circ C$ and $50{}^\circ C$

• A) good absorbers and bad emitters of heat

B) good absorbers and good emitters of heat

C) bad absorbers and good emitters of heat

• A) Stainless steel

B) brass

C) Aluminum

D) copper

• A) long

B) narrow

C) uniform

D) All of these

• A) Heated molecules become less dense and rise

B) Colder molecules from above move down and get heated

C) The heat is transferred by convection

D) All of these are correct

• A) Both the thermometers will read the same temperature

B) Thermometer 'A' will show higher temperature than 'B'

C) Thermometer 'B' will show higher temperature than 'A'

D) None of the above is correct.

• A) Stirring the contents of cup continuously

B) Adding a piece of ice to the cup of hot tea

C) Pouring the hot tea in a saucer

D) Adding more sugar to the cup of tea.

• A) becomes cold by the process of conduction;

B) becomes cold by the process of convection;

C) becomes cold by the process of radiation;

D) does not become cold.

• A) conduction and convection

• A) $-98.5{}^\circ C$

B) $100{}^\circ C$

C) $-273.15{}^\circ C$

D) $-469.5{}^\circ C$

• A) Two blankets have more wool and hence provide greater warmth.

B) Two blankets enclose air which does not allow the cold to penetrate.

C) Two blankets compress the air in between the body and the blankets and this compression produces heat.

D) None of these.

• A) To keep it away from the hot compressor which is near the bottom?

B) so that it can cool the whole interior by setting up convection currents

C) for the sake of convenience

D) None of these

• A) glass might break down at low temperature

B) heat does not flow from the body whose measurement we are taking with the thermometer

C) at low temperatures mercury becomes transparent and it becomes difficult to take the readings

D) Mercury freezes at low temperatures

• A) Heat we supply assumes red color at high temperature

B) Mechanical energy is being converted into heat energy

C) All me fats glow in red color when heated

D) Heat energy is being converted into light energy

• A) gaps give the space to the tracks to expand in summer heat

B) gaps hold the tracks firmly

C) to produce gentle rhythmic sound when the train moves on the track

D) it is customary to leave the gaps

• A) It is dissipated as sound energy

B) It is consumed to increase the energy of the molecules

C) It is used to change the state of the substance

D) It is still an unsolved problem in science

• A) wax has a very high melting point

B) wax is a good conductor of heat

C) glass is a good conductor of heat

D) wax and glass are bad conductors

• A) conduction

B) convection

D) condensation

• A) produce electricity

B) to absorb more light

C) to prevent heating by radiation

D) to make to strong

• A) We can easily find the degree of hotness of a body by using the sense of touch.

B) We prefer to wear white clothes made of cotton during winter because cotton is a bad conductor of heat.

C) The thermometer that we use to measure body temperature is called clinical thermometer.

D) All the above are correct

• A) The range of clinical thermometer is $35{}^\circ C~-\,45{}^\circ C$

B) The normal body temperature of human body is $39{}^\circ C.$

C) Heat flows from a body containing larger amount of heat to a body containing lesser amount of heat.

D) All the above are correct.

• A) To keep its size compact

B) The temperature of human body can normally fluctuate between these two extreme ranges of lower and higher temperatures.

C) Both the above.

D) None of these.

• A) $P-100{}^\circ C,$ $Q-40{}^\circ C$

B) $P-90{}^\circ C,$ $Q-10{}^\circ C$

C) $P-50{}^\circ C,$ $Q-10{}^\circ C$

D) $P-60{}^\circ C,$ $Q-50{}^\circ C$

• A) the heat will stop flowing from P to Q

B) the heat will stop flowing from Q to P

C) the heat continue flowing from P to Q and vice versa

D) None of the above

• A) More than X

B) Less than X

C) Equal to X

D) None of the above

• A) cools slowly as compared to seawater

B) cools rapidly as compared to seawater

C) cools at the same rate as seawater

D) None of the above

• A) a fan supplies cool air

B) the evaporation of sweat

C) fan increases the humidity in air

D) fan decreases the humidity in air

• A) Metal are bad conductors

B) In gases, heat is transferred by conduction

C) In conduction, molecules move from hotter to colder parts transmitting energy.

D) Metals conduct heat better than the gases

• A) Poor emitters

B) non-emitters

C) Good emitters

D) highly polished

• A) Platinum thermometer

B) Gas thermometer

C) Pyrometer

D) Vapor pressure thermometer

• A) microscopic concept

B) macroscopic concept

C) space-time concept

D) none of the above

• A) by conduction only

C) by conduction and convection

• A) Wool is a poor conductor of heat

B) Wool is a good conductor of heat

C) Both the above are correct

D) None of the above is correct

• A) Copper bottom makes the pan more durable

B) Copper bottom makes the pan appear beautiful

C) Copper is a better conductor of heat than steel

D) Copper can be learned more easily as compared to steel

• A) There is no movement of the substance

B) The heat transfer takes place from higher temperature part of body to lower temperature part of body

C) Occurs when one end of an iron rod is heated on a burner

D) All the above are correct

• A) Iron being a good conductor, conducts away heat given to paper.

B) Wood being an insulator, takes away all the heat.

C) In case of iron rod, the candle is near the paper.

D) Paper around iron rod is thicker.

•  Column - I Column - II (A) Range of clinical thermometer (p) $\text{35 }\!\!{}^\circ\!\!\text{ C}\,\,\text{to 42}{}^\circ \text{C}$ (B) Range of Laboratory thermometer (q) $-10{}^\circ C$to $110{}^\circ C$ (C) Normal body temperature (r) $37{}^\circ C$ (D) A liquid metal (s) Mercury

A) A$\to$ (p), B$\to$ (q), C$\to$ (r), D$\to$ (s).

B) A$\to$ (q), B$\to$ (r), C$\to$ (s), D$\to$ (p)

C) A$\to$ (r), B$\to$ (s), C$\to$ (p), D$\to$ (q)

D) A$\to$ (s), B$\to$ (p), C$\to$ (q), D$\to$ (r)

•  Column - I Column - II (A) Melting (p) Solid to gas (B) Sublimation (q) Solid to liquid (C) Condensation (r) Gas to liquid (D) Vaporization (s) Liquid to gas

A) A$\to$ (q), B$\to$ (p), C$\to$ (r), D$\to$ (s)

B) A$\to$ (p), B$\to$ (q), C$\to$ (r), D$\to$ (s)

C) A$\to$ (s), B$\to$ (p), C$\to$ (q), D$\to$ (r)

D) A$\to$ (r), B$\to$ (s), C$\to$ (p), D$\to$ (q)

• A) Metal is a poor conductor of heat.

B) The expansion of the glass after heating is uniform and therefore it cracks.

C) In case of glass the heat is transmitted quickly when heated.

D) Glass is a poor conductor of heat.

• A) air

B) silver

C) iron

D) water

• A) Iron being a good conductor conducts more heat from our body

B) Paper being a good conductor conducts more heat from our body

C) More heat flows from the iron to our body

D) More heat flows from the paper to our body

• A) The temperature in cup A will decrease and the temperature in cup B will increase.

B) The temperature in cup A will decrease and the temperature in cup B will decrease.

C) The temperature in cup A will increase and the temperature in cup B will increase.

D) The temperature in cup A will increase and the temperature in cup B will decrease.

• A) Radiation of heat from the water in the cups to the thermometers

B) Conduction of heat through the aluminum bar

C) Radiation of heat from the water in the cups into the air

D) Conduction of heat through the air to the Water in the cups

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Statement (1) and (3) are incorrect while statement (2) is correct.

B) Statement (1) and (2) are incorrect while (3) is correct.

C) All the statements are correct.

D) All the statements are incorrect.

• A) Statement (1) and (3) are incorrect while statement (2) is correct.

B) Statement (1) and (2) are incorrect while (3) is correct.

C) All the statements are correct.

D) All the statements are incorrect.

• A) The ball will not pass through because there is no change in the ring.

B) The ball can now pass through it because the ring diameter expands on heating.

C) The ball gets stuck because the diameter of the hole decreases on expansion.

D) None of the above

• A) The level of alcohol falls in both limbs.

B) The level of alcohol in the limb X rises while that in limb Y falls.

C) The level of alcohol in limb X falls while that in limb Y rises.

D) There is no change in the levels of alcohol in the two limbs.

• A) Both hands give the same feeling about hotness of water to both the hands.

B) The hand taken out from ice cold water will tell that the water in (ii) is hot while the other hand will tell the water in (ii) is cold.

C) The hand taken out from ice cold water will tell that the water in (ii) is cold while the other hand will tell that water in (ii) is hot.

D) None of the above is correct.

• A) A

B) B

C) C

D) D