Physics – Class 11 Practice Test 10

1. A particle is initially at the centre and going towards the left. Let T be the time period of the SHM it is undergoing. What will be its position and velocity at time 3T/4, if it starts from the centre at t=0?

2. A pipe is open at both ends. What should be its length such that it resonates a 10Hz source in the 2nd harmonic? Speed of sound in air = 340m/s.

3. An observer is standing stationary in air moving at a speed of 2m/s. A source of frequency 20Hz is moving in the direction of wind with speed 10m/s towards the observer. What will be the frequency as heard by the observer? Speed of sound in air is 330m/s.

4. A particle is performing a SHM. If its mass is doubled keeping the amplitude and force constant the same, total energy will become how many times the initial value?

5. If both the source of sound and observer are moving, the apparent frequency will be different from the actual frequency. True or False?

6. In the given phasor diagram what should be the minimum velocity of particle 2 at mean position so that it catches particle 1 before it reaches the extreme position? The projection of motion of particle 1 on x-axis is governed by the equation: x = 4sin(2t).

7. A particle starts from the extreme position, at t = 0, in a SHM. If the time period of motion is 2s & maximum speed is 5m/s, find the equation of motion.

8. The speed of sound in air is 330m/s. What is the mass of 1 mole of air? Assume it is an ideal gas.

9. Higher the value of damping constant, higher will be the amplitude at resonance. True or False?

10. If a body in uniform circular motion covers the given angle in 0.5s, what is the time period of projection, on the x-axis, undergoing SHM? Assume it moves anti-clockwise.