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CSIR NET Life Science Mock Test for Students
A wire of linear density 0.01 gm/em is stretched with a tension of 10N. It resonates at a frequency of 200Hz. The next higher frequency at which it resonates is 240 Hz. Find the length of the wire
1. 1.25 cm
2. 1.25 m
3. 125 m
4. 1m
Option 2 – 1.25 m
A wave traveling in a rod meets a metallic joint where the Young modulus is twice the value but density remains the same. Calculate the reflection and transmission coefficient of the amplitude
1. 0.17, 0.83
2. 0.88, 0.77
3. 0.83, 0.07
4. 1.17, 1.83
Option 1 – 0.17, 0.83
A stretched string is observed to vibrate with a frequency of 30 c.p.s in the fundamental note when the length of the string is 60 cm. The string has a mass of 0.5 gm/cm. Find the velocity of propagation of the transverse wave and compute the tension of the string
1. 360 m
2. 3600 cm/sec
3. 3600 m/sec
4. 36 m/sec
Option 2 – 3600 cm/sec
A tuning fork has a frequency of 256 and an amplitude of 0.5 cm. If the velocity of sound is 340 m/s, calculate the energy current (The density of air is 0.001293 gm/cc)
1. 119 J/s/m
2. 119 J/s/m²
3. 119 J/s
4. 109 J/s/m²
Option 2 – 119 J/s/m²
In a non-dispersive medium, the group velocity is
1. less than the phase velocity
2. greater than the phase velocity
3. equal to the phase velocity
4. independent of phase velocity
Option 3 – equal to the phase velocity
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