Ch 1

1

Which surface is a good emitter of heat?

A Shiny surface B Polished surface C Black surface D White surface

2

Black pots are used in solar cookers because:

A They reflect heat B They absorb heat C They conduct electricity D They cool fast

3

Heat transfer in room heaters mainly occurs by:

A Conduction B Radiation C Convection D Evaporation

4

Handles of cooking pans are made of wood because:

A Wood is heavy B Wood is cheap C Wood is a poor conductor of heat D Wood looks good

5

Solar cooker works mainly on:

A Conduction B Convection C Radiation D Evaporation

6

Thermos flask reduces heat loss by:

A Conduction only B Convection only C Radiation only D All three modes

7

Which surface reflects most heat?

A Black B Rough C Shiny D Dark

8

Geothermal energy produces less:

A Heat B Electricity C Pollution D Steam

9

Global warming can cause:

A Melting of glaciers B Decrease in sea level C Lower temperature D Stable climate

10

Why are cooking utensils made of metal?

A They are light B They are shiny C They conduct heat well D They are cheap

11

Which gas traps heat in atmosphere?

A Oxygen B Nitrogen C Carbon dioxide D Helium

12

Which material is a good conductor of heat?

A Wood B Plastic C Glass D Copper

13

Global warming is mainly due to:

A Deforestation B Greenhouse gases C Volcanoes D Ocean currents

14

Main source of energy for greenhouse effect is:

A Earth’s core B Sun C Moon D Fossil fuels

15

Formula for heat is:

A Q = mcΔT B Q = m/ΔT C Q = c/ΔT D Q = mc

16

Which mode of heat transfer does not require a medium?

A Conduction B Convection C Radiation D Evaporation

17

Which substance has a high specific heat capacity?

A Iron B Copper C Water D Aluminium

18

Which gas is mainly responsible for greenhouse effect?

A Oxygen B Nitrogen C Carbon dioxide D Hydrogen

19

Convection occurs mostly in:

A Solids B Liquids and gases C Vacuum D Metals only

20

Which factor does not affect specific heat capacity?

A Nature of substance B Mass C Temperature change D Material

21

Sea breeze occurs due to:

A Radiation B Conduction C Convection D Evaporation

22

Geothermal energy is considered:

A Non-renewable B Renewable C Polluting D Limited

23

Which energy source is eco-friendly?

A Coal B Oil C Geothermal D Gasoline

24

High specific heat capacity of water helps in:

A Rapid heating B Climate moderation C Fast cooling D Heat insulation

25

Which material heats up fastest?

A High specific heat capacity B Low specific heat capacity C Large mass D High density