Physics MCQs for Class 9 with Answers Chapter 8

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Physics MCQs for Class 9 with Answers


Larger number of slots are made in radiators to increase:
Surface temperature
Surface area
Both A and B
Nonr

Leslie cube have faces:
2
3
4
5

Central heating systems in buildings operate by
Conduction
Radiation
Convection
Condensation

Heat form one of a metal rod a reaches to the other by the process of
convection
radiation
conduction
both (a) and (b)

Dull black surface are good ____________
Absorber
Radiator
Conductor
None of these

Rooms are heated using gas heater by:
Conduction only
Convection and radiation
Radiation only
Convection only

The main source of energy in the unierse is:
Moon
Stars
Sun
Planets

Which of the following is a good radiator of heat?
A shining slivered surface
A dull black surface
A white surface
A green coloured surfaced

……………. causes coastal breeze.
Conduction
Convection
Radiation
Nil

Glider pilots use __________ movement of hot air currents due to convection of heat:
Downward
Upward
Left
right

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