# Simple harmonic motions & waves

Encircle the most appropriate answer from the following options:

1.         A spider detects its prey due to ____ produced in the web

(a) Movement

(b) Disturbance

(c) Vibration

(d) Elasticity

2.         A body is said to be ___ if it moves back and forth about a point

(a) least circulate

(b) vibrating

(c) rotating

(d) none of these

3.         The particles of the solid Can vibrate about their

(a). vertices

(b) edges.

(c) mean position

(d) length

4.         Vibration is also known as

(a) Trip

(b) Movement

(c) Oscillation

(d) Circulation  Motion of Mass Attached to spring

5.         Motion of mass attached to spring is an example of motion.

(a) simple harmonic

(b) linear

(c) circular

(d) vibration

6.         The force applied on a body is directly proportional to the change in length. This is,

(a) Weber Fechner law

(b) Hooke’s Law

(c) Law of gravitation

d) Archimedes principle

7.         The maximum potential energy of a vibrating mass attached to a spring is at ___

(a)Equilibrium position

(b) Extreme position

(c) Between equilibrium and extreme positions

(d) All the above

8.         In F = kx , k indicates,

(a)force constant

(b) spring constant

(c) constant

(d) displacement

9.         The value of k depends upon of spring.

(a)length

(b) width

c) elasticity

(d) stiffness

10.       The value of spring constant in case of soft spring is :

(a) Small

(b) large

(c ) mild

(d) none

1 1.      Force exerted on the body is always directed at the displacement of mass.

(a) towards

(b) opposite to

(c) at

(d) away from

12.       force always pushes or pulls the object performing oscillatory motion towards the mean position.

(a) gravitational

(b) applied

(c) spring

(d) restoring force

13.       The magnitude of the restoring force _____ with the distance from the mean position.

(a). decreases

(b) not change

(c) increases

(d) remains same

14.       Due to the mass it does not stop at the mean position but continues its motion.

(a) restoring force

(b) inertia

(c) reactional force

(d) gravitational force

15.      The speed of mass ____ As it moves towards the extreme position.

(a)remains sonle

(b) increases

(c) decreases

(d) none of these

16.       The ratio of exerted force to displacement is called

(a) Hooke’s. Law

(b) spring constant

(c) restoring force

(d) All of these

17.       Kinetic energy is ____ at an extreme position.

(a)minimum

(b) moderate

(c) high

(d) zero

18.       In the ball  and bowl system the ___ force acts as a restoring force.

(a) gravitational

(b) applied

(c) reactional

(d) none of these

19.       Ball and bowl system is an example of

(a)gravitational

(b) Law of mass action

(c) SHM

(d) Hooke’s law

20.       In ball and bowl system the mean position is at

(a) Earth

(b) extreme position

(c) floor of bowl

(d) centre of bowl

21.       A human eardrum can oscillate back and forth up to ____ times in one second

(a)20,000

(b) 2,000

(c) 200,000

(d) 200

22.       The displacement of an object in SHM when the kinetic energy and potential energy is equal ___

(a) Equilibrium position

(b) Extreme position

(c) In the middle of equilibrium and   extreme positions

(d) All the above

23.       The to and fro motion of ball about mean position Continues till all its energy is lost due to ___

(a) gravitational

(b) frictional force

(c) friction

(d) weight Motion of Simple Pendulum

24.       In ____ position, the net force on bob is zero and the bob is stationary.

(a)equilibrium

(b) frictional

(c) extreme

(d) none of these

25.       The period of a pendulum is independent of its

(a) length

(b) mass

(c) amplitude

(d) both b and c

26.       Transmission can be heard ira such areas where the waves can not reach directly due to:

(a) Reflection

(b) Refraction

(c) Interference

(d) Diffraction

27.       Which is example of simple harmonic motion

(a)up and         motion of’ leaf in water pond

(b) motion of a ceiling fan

(c) motion of   Clock

(d) none these

28.       The time in which the vibrating body to complete one vibration is called

(a) Frequency

(b) Time period

(c) Pitch

(d) Altitude

29.       If the mass of bob of a simple pendulum is doubled, its time period

(a) is doubled

(b) becomes four times

(c) remains the same

(d) none of the above

30.       Diffraction of waves can clearly be observed if size of the slit or obstacle is nearly  equal to ___ of wave:

(a)Trough

(b) Crest

(c) Amplitude

(d) Wax elength

31.       Frequency is of time period

(a) reciprocal

(b) inversely proportional

(c) directly proportional

(d) none these

32.      The product of frequency and time period is equal to:

a) V

b)  1

c)  0

d) H

33.      Christian Huygen invented the pendulum clock in

(a) 1658

(b) 1657

(c) 1656

(d) 1654

34.       The net force is zero when bob of simple pendulum is

(a) Moving with uniform speed

(b) at rest

(c) Both of these

(d) none of these

35.       In case of simple pendulum which component of weight acts as restoring force

(a) mg sin 0

(b) mg cos 0

(c) mg

(d) None of these

36.      In SHM acceleration of vibrating body is always directed towards

(a) extreme position

(b) away from extreme position

(c) towards Illean position

(d) way from extreme position

37.       In SHM acceleration of vibratory motion is maximum At

(a) mean position

(b) extreme position

(c) Both a and b

(d) None of these

38.       In SHM velocity of vibrating b ‘(l        maximum at

(a) Mean position

(b) extreme

(c.) both a & b

(d) none

39.       In SHM velocity of vibråiing body is zero at

(a) Mean position

(b) Extreme

(c) Both a and b

(d) non these

40.        The bending of waves around the corners of obstacles is:

(a) Reflection

(b) Refraction-

(c) Interference

(d) Diffraction

41.       Water and light waves are

(a) transverse waves

(b) longitudinal wave

(c) electromagnetic waves

(d) None of these

42.       If mass of bob of simple pendulum is twiced its time period will

(a) doubled

(b) Four tinies

(c) remain the same

(d) none of these

43.       Which one of the following is not example of SHM

(a) Mass attached to spring

(b) ball and bowel system

(c) simple pendulum

(d) A bouncing ball

44.       Time period of simple pendulum is independent of

(a) mass

(b) Amplitude

(c) length

(d) Both a and b

45.       Time required to complete one cycle is called

(a) alliplitude

(b) frequency

(c) Time period

(d) none of these

46.       Number of vibrations completed in one second is called

(a) Frequency

(b) tilne period

(e) Amplitude

(d) none of these

47.       ___  developed the first pendulum clock that could accurately measure time.

(a) Galileo

(b) Architnedes

(c) Einstein

(d) Huygens

48.       Vibratory motion of ideal systems when there is no friction or resistance continues ___

(a) indefinitely

(b) directly

(c) definitely

(d) all of these\

49.       The oscillations of a system in the presence of some resistive force are  ___

(a) ‘”ave motion

(b) wavelength

(c) damped oscillations

(d) both a and b

50.       Shock absorbers damp vibrations and convert their energy into       ___ energy of oil.

(a) kinetic

(b) potential

(c) solar

(d) heat

51.       ___ are travelling disturbances.

(a) waves

(b) Power

(c.) frequency

(d) tune

52.       Wave transfer

(a) energy

(b) Power

(c) frequency

(d) disturbance

53.      The are ___ basic types of waves:

(a) 2

(b) 3

(c) 4

(d) 5

54.       Such waves which require medium for their production and propagation are called            waves;

(b) some electromagnetic

(c) Mechanical rays

(d) x rays

55.       Electromagnetic. waves consist of electrié .and magnetic fields oscillating to each other

(a) opposite

(b) perpendicular

(c) in accordance

(d) both a and b

56.       Heat and light waves are

(a) electromagnetic

(b) daniped

(c) mechanical

(d) none

57.       __ are parts of longitudinal waves where loops of spring are far apart from each other.

(a) compression

(b) rarefactions

(c) crest

(d) troughs

58.      Waves which do not require medium is called

(a) Electromagnetic waves

(b) Mechanical waves

(c) Both a and b

(d) none of these

59.       Electromagnetic waves consist of

(a) electric field

(b) Mågnetic field

(c) electric field and magnetic field

(d) none of these

60.       Heat and light waves are some example of

(a) Mechanical waves

(b) Transverse wave

(c) Longitudinal aves

(d) Electromagnetic waves