Solid State Physics for CSIR NET. We covered all the Solid State Physics for CSIR NET in this post for free so that you can practice well for the exam.
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MCQ on Solid State Physics for CSIR NET Exam
Two identical pipes are sounding notes of frequency 500 Hz. The air temperature in both is 25°C. The temperature of the air in one pipe is increased to 30°C. How many beats are heard per second, when both pipes are blown?
1. Two
2. One
3. Four
4. Three
Option 3 – Four
A locomotive approaching a crossing at a speed of 82 miles/hour sounds a whistle of frequency 400 cycles/sec. When 1.00 miles from the crossing. There is no wind and the speed of sound in the air is 0.200 miles/sec. What frequency is heated by an observer 0.60 miles on the straight road from the crossing at a right angle?
1. 242 vibrations/sec
2. 442 vibrations/sec
3. 450 vibrations/sec.
4. None of above
Option 2 – 442 vibrations/sec
The microwave which travels with the speed of light is dv reflected from a distant airplane approaching the wave source, It is found that when the reflected waves beat against the wave radiating from the source, the beat frequency is 990 cycles/sec. If the microwave is 0.01 meter in wavelength, what is the approach speed of an airplane?
1. 59.5 m/sec.
2. 49.5 m/sec.
3. 39.9 m/sec.
4. 69.5 m/sec.
Option 2 – 49.5 m/sec
On a calm day, the pitch of an engine whistle drops to (4/5)th of its value as it passes you. If the temperature of the day is 20°C. Find the velocity of the engine, the velocity of sound at 0°C is 332 m/sec.
1. 38.2 m/sec.
2. 48.2 m/sec.
3. 46.2 cm/sec.
4. 42.6 m/sec.
Option 1 – 38.2 m/sec
If the earth is moving towards a stationary star at a speed of 30 kilometers per second, find the apparent wavelength of light emitted from the star. The real wavelength has the value 5875A°.
1. 5600A
2. 5863 A
3. 5874.41A
4. 5983A
Option 3 – 5874.41A
In a non-dispersive medium group, velocity is
1. greater than the phase velocity
2. less than the phase velocity
3. independent of phase velocity
4. equal to the phase velocity
Option 4 – equal to the phase velocity
The velocity of sound in air at 4°C is 340 m/s. What will it be when the pressure of the gas is doubled and its temperature is raised to 157°C?
1. 420 m/s
2. 416.41 m/s
3. 416.4 m/s
4. 816.4 m/s
Option 2 – 416.41 m/s
The speed of sound in hydrogen is 1270 m/sec. What will be the speed in a mixture of oxygen and hydrogen mixed in a volume ratio 1 : 4
1. 635 m/s
2. 635 cm/s
3. 1230 m/s
4. none of above
Option 1 – 635 m/s
Two tuning forks with natural frequencies of 340 Hz. move relative to a stationary observer. One fork moves away from the observer, while the other moves towards him at some speed. The observer hears beats of frequency 3 Hz. Find the speed of the tuning fork, and the speed of sound in air at the given temperature.
1. 1.8 m/s
2. 1.4 m/s
3. 1.2 m/s
4. 1 m/s
Option 2 – 1.4 m/s
Columns of air at 51°C and a tuning fork produce 4 beats per second when sounded together. As the temperature of the air column is decreased the number of beats per second tends to decrease and when the temperature is 16°C the two produce 1 beat per second. Find the frequency of the tuning fork.
1. 50 Hz
2. 500 Hz
3. 250 Hz
4. 100 Hz
Option 1 – 50 Hz
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