10th Class Physics Chapter 1 TestTHERMAL PHYSICS

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Running warm water over a tight metal lid of a jar helps to open it because:

   1. The glass jar expands

   2. The metal lid expands slightly

   3. The liquid inside freezes

   4. The lid contracts

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

   1. Remains the same

   2. Increases

   3. Decreases

   4. Becomes double

3. Which substance has the highest melting point?

   1. Aluminum

   2. Gold

   3. Copper

   4. Lead

4. At what temperature does lead become a superconductor?

   1. Below 4.2 k

   2. Below 7.2 k

   3. At 35 degree

   4. At 0 degree

5. Evaporation is a natural process that occurs:

   1. Only when a liquid reaches its boiling point

   2. At all temperature, involving molecules at the surface

   3. Only in direct sunlight

   4. Only when the air is 100% humid

6. Evaporation occurs at which part of a liquid?

   1. The bottom

   2. The center

   3. The surface

   4. Throughout the entire liquid

7. Mercury becomes a superconductor below which temperature?

   1. 7.2 K

   2. 135 K

   3. 4.2 K

   4. 0 K

8. In the kinetic molecular model, the strongest intermolecular forces are found in:

   1. Solids

   2. Liquids

   3. Gases

   4. Superconductors

9. In an automobile cooling system, what is the primary rule of the radiator?

   1. To heat the water

   2. To control the water passing through it using a fan

   3. To pomp the fuel

   4. To store oil

10. Modern refrigeration systems avoid using which environmentally harmful chemicals?

    1. Carbon dioxide 

    2. Chlorofluorocarbons

    3. Oxygen

    4. Nitrogen