Thermal physics

1.On heating, the amplitude of vibration of the atoms or molecules of an object

• increases

• decreases

• remains constant

• remain same

2.The coefficient of volume expansion of solids is

• greater than liquids

• equal to gases

• less than liquids

• equal to liquids

3.Gaps are left in railway tracks to compensate thermal expansion during

• rainy season

• winter

• hot season

• wind

4.An increase in breadth, length, and thickness of a substance is due to

• fusion

• thermal expansion

• stress

• boiling

5.When the temperature of a rod of copper is increased, its length:

• stays the same

• increases

• decreases

• None of above

6. The amount by which unit length of a material increases when the temperature is raised one degree is called the coefficient of

• cubic expansion

• superficial expansion

• linear expansion

• Real expansion

7.The symbol used for volumetric expansion is:

• γ

• β

• L

• α

8. Some iron has a coefficient of linear expansion of 12 × 10−6 K−1. A 100 mm length of iron piping is heated through 20 K. The pipe extends by:

• 0.24 mm

• 0.024 mm

• 2.4 mm

• 0.0024 mm

9.Bimetallic strip when heated bends

• upwards

• downwards

• straight

• inside

10.Blocks of concrete which are few meters long are laid with gaps to overcome

• expansion

• conduction

• convection

• radiation