11th class (Fsc) Physics unit 7 MCQs
chapter 7 MCQs 11th Class Physics
Oscillation:
1. The relation between time period and frequency is:
a. f = T/2 𝜋
b. f = 2 𝜋T
c. fT = 1
d. f = 1/2𝜋T
2. The mathematical expression for the restoring force is:
a. F= dp/dt
b. f= kx
c. f= -kx
d. f= ma
3. The frequency of a second pendulum is:
a. 1.5 Hz
b. 1 Hz
c. 2 Hz
d. 0.5 Hz
4. In simple harmonic motion the velocity of a particle is maximum at:
a. in between extreme and mean position
b. Extreme position
c. Mean position
d. None of them
5. The force responsible for the vibratory motion of simple pendulum is:
a. mgsecθ
b. mgcosθ
c. mgtanθ
d. mgsinθ
6. If the time period of simple pendulum is 2 seconds, its frequency will be:
a. 1.5 Hz
b. 1 Hz
c. 2 Hz
d. 0.5 Hz
7. The frequency of waves produced in microwave oven is:
a. 1860 Hz
b. 1435 Hz
c. 2850 Hz
d. 2450 Hz
8. A spring of spring constant 10 mn-1 after loading the amplitude is 2m. then the maximum P.E is:
a. 30 J
b. 10 J
c. 40 J
d. 20 J
9. The wave produced in microwave oven have a wavelength of:
a. 18m
b. 12cm
c. 18cm
d. 12m
10. A phenomenon by which energy is dissipated from the oscillating system is called:
a. Simple harmonic oscillation
b. Forced oscillation
c. Damping
d. Free oscillation
11. The components of the weight which balances the tension in pendulum is:
a. mg tanθ
b. mg cosθ
c. -mg sinθ
d. mg sinθ
12. If 30 waves per second pass through a medium at speed of ms-1 , the wavelength is:
a. 1m
b. 30m
c. 900m
d. 15m
13. If the time period of a pendulum is 2 seconds then its frequency will be:
a. 0.5 Hz
b. 1 Hz
c. 0.25 Hz
d. 2 Hz
14. Time period of simple pendulum only depends on its:
a. Density
b. Mass
c. Length
d. Amplitude
15. The speed of sound is greater in solid than gases due to their high:
a. Temperature
b. Density
c. Oscillation
d. Elasticity
16. Maximum velocity in SHM is:
a. ϰꞷ
b. xoꞷ2
c. x2o ꞷ
d. xoꞷ
17. When three-fourth of the cycle of a vibrating body completed then the phase of vibration is:
a. 3 𝜋/2 radian
b. 𝜋 radian
c. 𝜋/4 radian
d. 𝜋/2 radian
18. When the amplitude of oscillation is doubled then its energy becomes:
a. One half
b. Double
c. Six times
d. Four times
19. The dimensions of spring constant “K” are:
a. [M2T-2]
b. [MT-2]
c. [MLT-2]
d. [M-2T]
20. Beats can be heard when difference of frequencies is not more than:
a. 2 Hz
b. 8 Hz
c. 4 Hz
d. 10 Hz
21. The time period of an oscillating mass spring system is 2 second. If the spring is cut in two equal parts and one spring is set for oscillation with the same mass, the new time period will be:
a. √2 sec
b. 2 sec
c. 4 sec
d. None of these
22. By increasing mass of the subject four times attached to a spring. Time period will becomes:
a. Thrice
b. same
c. Four times
d. Twice
23. One complete round trip of a vibrating body is called:
a. Vibration
b. Frequency
c. Amplitude
d. Time period
24. If amplitude of a simple pendulum is increased by 4 times, the time period will be:
a. Same
b. Four times
c. Two times
d. Half
25. The product of time period and frequency is:
a. 𝜋
b. zero
c. 2
d. 1