Physics MCQs for Class 9 with Answers Chapter 7

Which expands on heating?

Water

Steel

Copper

All are true

Coefficient of linear thermal expansion of Steel?

1.2 x 10-5

2.2 x 10-5

0.2 x 10-5

1.3 x 10-5

How many scales of measurement of temperature are?

One

Two

Three

Four

Degree of hotness or coldness a body is called:

Heat

Internal Energy

Temperature

Potential energy

Melting point is also known as:

Moiling point

Freezing point

Fusion point

None of these

Crocus flower open when the temperature is:

23 oC

26oC

29oC

32oC

The specific heat of water is

2100 Jkg-1 k-1

4200 Jkg-1 k-1

2500 Jkg-1 k-1

2010 Jkg-1 k-1

The changing of a liquid into vapours from the surface of the liquid without heating:

Cooling

Vaporization

Evaporation

Sublimation

The energy store in an atom or molecule due to intermolecular force is:

Kinetic energy

Potential energy

Internal energy

G.P.E

In summers the railways bends due to:

Expansion

Contraction

Both

None