# 7th Class Science Heat Question Bank

### done Heat

• A) The difference in the temperatures of the two bodies

B) The difference in the pressures exerted on the two bodies

C) The difference in the densities of the two bodies

D) The difference in the sizes of the two bodies

• A) Heat is a form of energy.

B) Water can boil by itself.

C) Water develops heat on its own.

D) Water is a universal solvent.

• A) The bore should be narrow.

B) The wall of stem should be thin.

C) The bulb should contain a lot of mercury.

D) The wall of glass bulb should be thin.

• A) Copper has low melting point.

B) Copper is an insulator of heat.

C) Copper is a good conductor of heat.

D) Copper is cheap.

• A) Keep it clean.

B) Polish it to shine.

C) Paint it green.

D) Paint it black.

• A) Heat energy

B) Celsius

C) Kelvin

D) Temperature

• A) Air is enclosed in between them.

B) The outer thin blanket transfers heat faster.

C) Air acts as medium to transfer the energy.

D) There is a decrease in the sensation of touch.

• A) copper.

B) iron.

C) aluminium.

D) vacuum.

• A) They are good conductors of heat.

B) They are bad conductors of heat.

C) They are costly.

D) They have nice look.

•  (i) Mercury is easily available in pure form. (ii) Mercury is opaque. (iii) Mercury has a constant coefficient of expansion.

A) Only (i) and (ii)

B) Only (ii) and (iii)

C) Only (i) and (iii)

D) (i), (ii) and (iii)

• A) Due to convection of heat

B) Due to conduction of heat

C) Due to radiation of heat

D) Due to conduction, convection and radiation of heat

• A) Kelvin scale

B) Celsius scale

C) Fahrenheit scale

D) Richter scale

• A) 100

B) 273

C) 180

D) 50

• A) $0-100{{\,}^{o}}C$

B) $32-214{{\,}^{o}}F$

C) $0-273\text{ }{{\,}^{o}}C$

D) $35-42\text{ }{{\,}^{o}}C$

• A) $32{{\,}^{o}}F$

B) $212{{\,}^{o}}F$

C) $100.4{{\,}^{o}}F$

D) $~98.4{{\,}^{o}}F$

• A) Conduction

B) Convection

D) Expansion

• A) Conduction

B) Convection

D) Diffusion

• A) To prevent bursting due to expansion

B) To prevent heat loss due to conduction

D) All of the above

• A) For the conduction of heat

B) For the insulation of heat

C) For the radiation of heat

D) All of the above

• A) Ventilation

C) Ocean currents

D) All of the above

• A) Plastic

B) Water

C) Glass

D) Copper

• A) Conduction

B) Convection

D) Insulation

• A) Wood

B) Aluminium

C) Iron

D) Bronze

• A) Conduction

B) Convection

D) Insulation

• A) From a high pressure to a low pressure region

B) From a colder to a hotter region

C) From a hotter to a colder region

D) From a low pressure to a high pressure region

• A) Silver

B) Iron

C) Aluminium

D) Copper

• A) Metals are good conductors of heat.

B) Metals are lustrous.

C) Metals are expensive.

D) Metals have high melting point.

• A) Glass

B) Copper

C) Plastic

D) Wood

• A) Conduction

B) Convection

D) Condensation

• A) Conduction of heat in the air

C) Convection currents of air

D) More sugar in their body cells

• A) Steel, being a good conductor, absorbs heat from our body.

B) Paper being a good conductor, absorbs more heat from our body.

C) Heat flows from steel to our body.

D) Heat flows from the paper to our body.

• A) Chemical energy is converted to electrical energy.

B) Electrical energy is converted to chemical energy.

C) Heat energy is converted to electrical energy.

D) Electrical energy is converted to heat energy.

• A) In solids, heat is transferred only by convection.

B) Convection occurs in cold liquids.

C) Convection requires a medium for transmission.

D) Heat flows from the cold end to the hot end in a substance.

• A) Outer-Silver/Inner-Silver

B) Outer-Black/Inner-Black

C) Outer - Silver, Inner ? Black

D) Outer - Black, Inner ? Silver

• A) Vacuum

B) Cork stopper

C) Double glass walls

D) Shiny/silvery wall

• A) Kinetic energy of the molecules of the substance increases.

B) Kinetic energy of the molecules of the substance decreases.

C) The amplitude of vibrations of molecules of the substance about their mean position decreases.

D) It does not cause any change.

• A) The rate of expansion of an object

B) The loss of heat energy

C) The volume of a gas occupied

D) The degree of hotness or coldness of a body

• A) Because they are good absorbers of heat

B) Because they are bad absorbers of heat

C) Because they are good reflectors of heat

• A) Silver cup

B) Aluminium cup

C) Wooden cup

D) Copper cup