Model Questions for Scientific Assistant (IMD) Exam (Paper-2) PHYSICS - Set 26

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1. A longitudinal wave travels in a material and creates a local region with lowered pressure.

a. Infrasonic
b. Ultrasonic
c. Compression
d. Rarefaction

2. An input signal is used to change the frequency of a carrier wave. The carrier wave now has regions of higher frequency and regions of lower frequency.

a. Carrier wave
b. Modulation
c. Amplitude Modulation
d. Frequency Modulation

3. Two sound waves of slightly different frequencies interfere and cause a throbbing effect.

a. Natural frequency
b. Resonance
c. Beats
d. Carrier wave

4. When the frequency of an oscillating force matches the natural frequency of the elastic body on which the force is applied, we have...

a. Resonance
b. Beats
c. Carrier wave
d. Modulation

5. An input signal is used to change the amplitude of a carrier wave. The carrier wave now has regions of higher frequency and regions of lower frequency.

a. Carrier wave
b. Modulation
c. Amplitude Modulation
d. Frequency Modulation

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6. A wave which is used as the base to carry a signal.

a. Beats
b. Carrier wave
c. Modulation
d. Amplitude Modulation

7. A force is applied to an elastic object and the force is then removed. The object now oscillates at a certain frequency.

a. Natural frequency
b. Resonance
c. Beats
d. Carrier wave

8. A process in which a lower frequency signal wave is impressed onto a higher frequency carrier wave.

a. Carrier wave
b. Modulation
c. Amplitude Modulation
d. Frequency Modulation

9. Compressions and rarefactions are not present with

a. longitudinal waves
b. transverse waves
c. both of these
d. neither of these

10. All other things being equal, the speed of a sound wave ____ if its wavelength increases.

a. increases
b. decreases
c. both of these
d. neither of these

Answer

1. (d) 2. (d) 3. (c) 4. (a) 5. (c) 6. (b) 7. (a) 8. (b) 9. (b) 10. (d)

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Study Kit for SSC Scientific Assistant (IMD) EXAM