Question # 1

On heating Air become:

Choose an answer

Heavier

Lighter

Remain same

None of these

During recent years the percentage of __________ increased considerably on earth:

Choose an answer

Carbon dioxide

Nitrogen

Oxygen

Methane

Which surface is bad emitter:

Choose an answer

White surface

Black surface

Coloured surface

Silver surface

The insulator of heat is:

Choose an answer

Cork

Cotton

Wood

All

Unit of thermal conductivity is .

Choose an answer

Wmk

W m^-1 K^-1

Wm

None of these

Thermos flask, is used to maintain:

Choose an answer

Heat

Temperature

Density

Pressure

Thermal conductivities of Lead

Choose an answer

23

30

35

85

See breeze blows form sear to land during:

Choose an answer

day

night

after noon

morning

Birds are able to fly on ____________

Choose an answer

Radiations

Thermals

Air

Layers

Rooms are heated using gas heaters by

Choose an answer

Conduction only

Convection and radiation

Radiation only

Convection only

In houses, good thermal insulation means _____________ consumption of fuel:

Choose an answer

Lower

Higher

Normal

None

The radiation from sun is:

Choose an answer

Alpha

Gamma

Radio

Ultraviolet

What happens to the thermal conductivity of a wall if its thickness is doubled?

Choose an answer

Become double

Remain the same

Become half

Become one fourth

More Classes

Other Links

Physics 9th Class English Medium Unit 9 Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer