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let’s start Physics MCQs 11 Class
- An oscillatory motion is always under
- a. a periodic force
- b. an elastic restoring force of inertia
- c. an elastic restoring forced
- d. an applied force and torque
- Answer: b. an elastic restoring force of inertia
- simple harmonic motion is the motion
- a. under the influence of damped restoring force
- b. with acceleration proportional to the displacement and oppositely directed.
- c. with acceleration proportional to the time
- d. with acceleration proportional to the displacement
- Answer: b. with acceleration proportional to the displacement and oppositely directed.
- simple harmonic motion is a type of
- a. irregular motion
- b. periodic motion
- c. spin motion
- d. none of these
- Answer: b. the periodic motion
- which of the following does not exhibit simple harmonic motion:
- a. A hanging spring supporting a weight, moving up and down
- b. The oscillating balance wheel of a watch
- c. The wheel of an automobile in motion
- d. The plucked string of a violin
- Answer: c. The wheel of an automobile is in motion
- when a particle is executing S.H.M., it is found the
- a. The acceleration depends upon its displacement
- b. the period depends upon its amplitude of motion
- c. The frequency depends on applied force
- d. The period and frequency are independent of each other
- Answer: a. The acceleration depends upon its displacement
- If there are no frictional effects, the mechanical energy of a system executing S.H.M
- a. is independent of amplitude
- b. depends on the amplitude
- c. is independent of mass
- d. remains conserved
- Answer: d. remains conserved
- The period of motion of a simple pendulum depends on:
- a. mass
- b. acceleration of gravity
- c. length
- d. b and c
- Answer: d. b and c
- The motion of a simple pendulum closely approximates SHM provided its maximum angular displacement does not exceed.
- a. 30 degrees
- b. 5 degrees
- c. 60 degrees
- d. 45 degrees
- Answer: b. 5 degrees
- with the help of a sonometer, the …….. of vibrating string can be found
- a. acceleration
- b. force
- c. frequency
- d. displacement
- Answer: c. frequency
- The velocity of sound in pace (vacuum) at 0.c is
- a. 332m/s
- b. 344m/s
- c. 323m/s
- d. Zero
- Answer: d. Zero
- The characteristics of a wave can be explained by three main physical concepts i.e wavelength, frequency and.
- a.acceleration
- b. velocity
- c. time period
- d. displacement
- Answer: d. displacement
- …… is not a simple harmonic motion
- a. motion of a simple pendulum
- b. the motion of a swing
- c. motion of a projectile
- d. vibrations of a tuning fork
- Answer: c. motion of a projectile
- The periodic variation in intensity at a given point due to the superposition of two waves of slightly different frequencies is called:
- a. pitch
- b. doppler effect
- c. SHM
- d. beats
- Answer: d. beats
- When two identical waves are superposed, the velocity of the resultant waves.
- a. increases
- b. decreases
- c. remains unchanged
- d. Become zero
- Answer: c. remains unchanged
- Which of the following properties of sound is affected by a change in air temperature:
- a. frequency
- b. amplitude
- c. intensity
- d. wavelength
- Answer: d. wavelength
- In a stationary wave, nodes are the points having
- a. minimum displacements
- b. minimum weights
- c. maximum displacements
- d. maximum weights
- Answer: a. minimum displacements
- choose the correct answer:
- a. A mechanical transverse wave motion is possible both in gas. metal and string.
- b. A mechanical transverse wave motion is possible in sting and metal but not in gas.
- c. A mechanical transverse wave motion is possible in water and gas
- d. A mechanical transverse wave motion is possible neither in gas nor in metal.
- Answer: b. A mechanical transverse wave motion is possible in sting and metal but no in gas.
- A sound wave travels from air to water. which one of the following quantities remains unchanged:
- a. intensity
- b. wavelength
- c. frequency
- d. velocity
- Answer: c. frequency
- If you go on increasing the stretching force on a wire in a guitar, then its frequency:
- a. increases
- b. decreases
- c. remains unchanged
- d. become zero
- Answer: a. increases
- The value of the velocity of sound is zero is the highest in
- a. Air
- b. space
- c. water
- d. steel
- Answer: d. steel
- The frequency of sound waves audible by humans is;
- a. 5 c/s
- b. 5000 c/s
- c. 27000 c/s
- d. 50000 c/s
- Answer: b. 5000 c/s
- A spring of force k is cut into 3 equal pieces, The force k of each part will be;
- a. k/3
- b. 3k
- c. k
- d. 9k
- Answer: b. 3k
- The Doppler effect applies to
- a. sound waves only
- b. light waves only
- c. heat waves only
- d. both sound waves and light waves.
- Answer; d. both sound waves and light waves.
- If more ‘weights’ are added to the mass attached with a vibrating spring, its time period:
- a. increases
- b. decreases
- c. remains constant
- d. become zero
- Answer;; a. increases
- If the tension in a stretched string is increased 4 times, then the speed of the transverse waves in the string will increase.
- a. 4 times
- b. 16 times
- c. 8 times
- d. 2 times
- Answer: d. 2 times
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