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Physics Practice Assessment: Paper 1 (Section I)

This section includes multiple-choice questions covering a broad range of topics including mechanics, thermodynamics, and electricity.

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SECTION I (Multiple Choice Questions)

1. Which of the following pairs of physical quantities consists of both scalar quantities?

• A) moment and force

• B) energy and power

• C) Force and distance

• D) Velocity and momentum

2. Which of the following is a unit of pressure?

• A) $\text{Kgm}^2\text{s}^{-1}$

• B) $\text{kgms}^{-2}$

• C) $\text{kgm}^{-1}\text{s}^{-2}$

• D) $\text{kgm}^{-1}\text{s}$

3. An atom is electrically neutral because it has:

• A) more neutrons than electrons

• B) more protons than neutrons

• C) same number of protons as neutrons

• D) same number of protons as electrons

4. When you look at the speedometer of a moving car, the quantity you read is:

• A) acceleration

• B) instantaneous speed

• C) average speed

• D) average distance

5. Figure 1 shows a uniform beam placed on a pivot. The clockwise moment of the beam in Nm is:

(Figure 1 Details: Force of 4N at a distance of 0.4m from the pivot)

• A: 0.8

• B: 2.4

• C: 1.2

• D: 1.6

6. Silicon (Si) is an example of:

• A) a semiconductor

• B) a conductor

• C) an alloy

• D) an insulator

7. Which of the following actions will help increase the sensitivity of a moving coil galvanometer?

• A) Making the pointer shorter

• B) making the pointer fatter

• C) Increasing the diameter of pointer

• D) increasing the length of the pointer

8. A certain radioactive isotope has a half-life of 24 minutes. How long will it take for its activity to drop to 1/8 of its initial value?

• A) 12 minutes

• B) 24 minutes

• C) 72 minutes

• D) 96 minutes

9. A circuit component which is used to change an alternating current into a direct current is a:

• A) Transistor

• B) Transformer

• C) Diode

• D) Fuse

10. The change of state directly from gas to solid without passing through a liquid is called:

• A) deposition

• B) condensation

• C) solidification

• D) sublimation

11. A machine raises a load of 5000 N to a height of 6.0 m in 5 s. The power developed by the machine is:

• A) 150000 W

• B) 166.7 W

• C) 6000 W

• D) 4166.7

12. Which of the following instruments is used to measure pressure?

• A) sonometer

• B) thermometer

• C) micrometer

• D) manometer

13. The rate of doing work is also called:

• A) efficiency

• B) power

• C) energy

• D) conversion

14. The process of adding small amounts of impurities to an intrinsic semiconductor to increase its conductivity is called:

• A) ionization

• B) lagging

• C) insulation

• D) doping

15. Water is suitable for use as a cooling liquid because it:

• A) expands abnormally

• B) has a high specific heat capacity

• C) freezes at 0°C

• D) has a high density

16. A ray of light is incident at an angle of 30° from air into a transparent material. If the angle of refraction is found to be 19°, then the refractive index of this material is:

• A) 1.5

• B) 1.6

• C) 0.2

• D) 0.7

17. The inner surface of a vacuum flask is always made shiny. This helps to reduce heat loses by:

• A) conduction

• B) evaporation

• C) convection

• D) radiation

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END!