10th class Physics, Chapter 12: Waves MCQs

1. The direction of vibration in a longitudinal wave is:

1. (A) at right angles to the wave direction
2. (B) in circular motion
3. (C) opposite to the wave direction
4. (D) in the same direction as the wave travels ✓

2. Which part of a transverse wave carry the lowest point?

1. (A) Crest
2. (B) Compression
3. (C) Rarefaction
4. (D) Trough ✓

3. Which of the following wave type requires a medium to travel?

1. (A) X-rays
2. (B) Light waves
3. (C) Radiowaves
4. (D) Sound waves ✓

4. The property of a wave which indicates how much energy it carries is:

1. (A) crest
2. (B) amplitude ✓
3. (C) wavelength
4. (D) speed

5. A wave front is:

1. (A) the distance between two crests
2. (B) a region of high pressure in a wave
3. (C) a line joining points that vibrate in phase ✓
4. (D) the outer edge of a wave medium

6. The wave phenomenon which occurs when waves change direction due to a change in speed is:

1. (A) diffraction
2. (B) reflection
3. (C) absorption
4. (D) refraction ✓

7. What happens to wave speed and wavelength when a tsunami approaches shallow water?

1. (A) Speed increases, wavelength increases
2. (B) Speed decreases, wavelength shortens ✓
3. (C) Speed remains the same, wavelength shortens
4. (D) Speed increases, wavelength stays constant

8. Which wave behaviour explains how sound is heard around a corner?

1. (A) Reflection
2. (B) Refraction
3. (C) Interference
4. (D) Diffraction ✓

9. Waves transfer:

1. (A) neither matter nor energy
2. (B) energy without transferring matter ✓
3. (C) matter without energy
4. (D) both matter and energy

10. In a ripple tank the waves are produced by:

1. (A) heating the water
2. (B) passing an electric current
3. (C) a magnet
4. (D) a bar vibrated up and down by a motor ✓

11. Mechanical waves cannot pass through:

1. (A) a solid
2. (B) a vacuum ✓
3. (C) water
4. (D) air

12. Which of the following is a mechanical wave?

1. (A) Radiowaves
2. (B) Seismic waves ✓
3. (C) Light
4. (D) X-rays

13. Which of the following can travel through vacuum?

1. (A) Water waves
2. (B) Waves on a rope
3. (C) Electromagnetic waves ✓
4. (D) Sound waves

14. The speed of electromagnetic waves in vacuum is about:

1. (A) 3 × 10⁸ m s⁻¹ ✓
2. (B) 3 × 10⁶ m s⁻¹
3. (C) 340 m s⁻¹
4. (D) 3 × 10⁵ m s⁻¹

15. Radiowaves are electromagnetic waves which travel through air at a speed of about:

1. (A) 30 km per second
2. (B) 3,00,000 km per second ✓
3. (C) 340 m per second
4. (D) 3,000 km per second

16. Warm objects radiate light mostly in the:

1. (A) infrared region ✓
2. (B) ultraviolet region
3. (C) X-ray region
4. (D) gamma-ray region

17. In a transverse wave the particles of the medium vibrate:

1. (A) in a circle only
2. (B) not at all
3. (C) at right angles to the direction of the wave ✓
4. (D) parallel to the direction of the wave

18. A water wave is an example of a:

1. (A) transverse wave ✓
2. (B) longitudinal wave
3. (C) sound wave
4. (D) compression only

19. Sound waves in air are:

1. (A) transverse waves
2. (B) electromagnetic waves
3. (C) light waves
4. (D) longitudinal waves ✓

20. A region of a longitudinal wave where the particles are spread apart is called:

1. (A) compression
2. (B) crest
3. (C) trough
4. (D) rarefaction ✓