1. Which of the following best defines a wavefront?
Answer:
Explanation:
A wavefront is the locus of points having the same phase of oscillation.
2. The phenomenon of bending of waves around obstacles is called:
Answer:
Explanation:
Diffraction refers to the bending of waves around the corners of an obstacle or aperture into the region of the geometrical shadow of the obstacle.
3. Which wave property changes when it passes from one medium to another?
Answer:
Explanation:
The speed of a wave changes when it moves from one medium to another, causing refraction. Frequency remains unchanged.
4. The time taken by a wave to complete one oscillation is called:
Answer:
Explanation:
Time period is the time taken by a wave to complete one oscillation or cycle.
5. Which of the following is a longitudinal wave?
Answer:
Explanation:
Sound waves are longitudinal waves where particles of the medium oscillate parallel to the direction of wave propagation.
6. If the frequency of a wave is 10 Hz, its time period is:
Answer:
Explanation:
Time period = 1/frequency. Hence, the time period is 0.1 seconds.
7. In a standing wave, the points that appear to remain stationary are called:
Answer:
Explanation:
In a standing wave, nodes are points where there is no movement or displacement.
8. The phenomenon of splitting of white light into its component colors is known as:
Answer:
Explanation:
Dispersion refers to the splitting of white light into its constituent colors due to differences in the refractive index for different wavelengths.
9. Which of the following waves cannot travel in a vacuum?
Answer:
Explanation:
Sound waves are mechanical waves and require a medium to propagate. They cannot travel in a vacuum.
10. The number of oscillations per second is termed as:
Answer:
Explanation:
Frequency represents the number of oscillations or cycles completed by a wave in one second.
11. The speed of a wave is given by:
Answer:
Explanation:
The speed (v) of a wave is given by v = λf, where λ is the wavelength and f is the frequency.
12. Waves generated in a pond due to a stone dropped are:
Answer:
Explanation:
Ripples on the surface of the water are transverse waves with particles moving perpendicular to the direction of wave propagation.
13. In which of the following waves is polarization observed?
Answer:
Explanation:
Polarization is a property specific to transverse waves, and among the given options, light waves exhibit polarization.
14. The distance between two consecutive compressions or rarefactions in a sound wave represents:
Answer:
Explanation:
In a sound wave, the distance between consecutive compressions or rarefactions represents one complete cycle or wavelength.
15. The Doppler effect is associated with:
Answer:
Explanation:
The Doppler effect relates to the change in frequency or wavelength of a wave concerning an observer moving relative to the source of the wave.