Engineering Physics I Mock Test 7

10%

Question 1 of 10

1. Statement: Ocean waves hitting a beach are always found to be nearly normal to the shore.
Reason: Once waves hitting a beach are assumed to be plane waves.

Statement is true but the reason is false

Both statement and reason are true and the reason is the correct explanation of the statement

Both statement and reason are true but the reason is not the correct explanation of the statement

Both statement and reason are false

Question 1 of 10

Question 2 of 10

2. A wave of frequency 100Hz travels along a string towards its fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10cm from the fixed end. The speed of the wave (incident and reflected) is?

5m/s

40m/s

10m/s

20m/s

Question 2 of 10

Question 3 of 10

3. In an experiment with sonometer a tuning fork of frequency 256Hz resonates with a length of 25cm and another tuning fork resonates with a length of 16x\cm. Tension of the spring remaining constant the frequency of the second tuning fork is?

20.4Hz

320Hz

163.84Hz

400Hz

Question 3 of 10

Question 4 of 10

4. Speed of recession of a galaxy is proportional to its distance __________

Linearly

Directly

Inversely

Exponentially

Question 4 of 10

Question 5 of 10

5. A vehicle, with a horn of frequency n is moving with a velocity of 30m/s in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency n+n₁. Then (if the sound velocity in air is 300m/s)

n₁=0.1n

n₁=10n

n₁=0

n₁=-0.1n

Question 5 of 10

Question 6 of 10

6. The apparent frequency in Doppler’s effect does not depend upon ___________

Frequency of the source

Speed of the source

Distance between the observer and source

Speed of the observer

Question 6 of 10

Question 7 of 10

7. Sensitivity increases with a decrease in intensity.

False

True

Question 7 of 10

Question 8 of 10

8. How are sound waves with a frequency of 20Hz to 20,000Hz termed?

Audible sound

Infrasonics

Ultrasonics

Inaudible sounds

Question 8 of 10

Question 9 of 10

9. A train is approaching with velocity 25m/s towards a pedestrian standing on the track, frequency of horn of train is 1 kHz. Frequency heard by the pedestrian is (v=350m/s).

985Hz

1077Hz

945Hz

1167Hz

Question 9 of 10

Question 10 of 10

10. A transverse wave passes through a string with the equation
y=10sinπ(0.02x-2t)
Where x is in metres and t in seconds. What is the maximum velocity of the particles in wave motion?

78m/s

63m/s

100m/s

121m/s

Question 10 of 10