Title Class XI Physics Exemplar Problem 2.8 MB 220
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C K

C K

Class XI

PHYSICS

Exemplar Problems

Page 110

Exemplar Problems–Physics

100

d
is

p
la

c
e
m

e
n

t

0 1 2 3 4 5 6 7 time (s)

attached to the two springs as shown in Fig. 14.3, the oscillation
frequency would be

(a) 1 + 2.

(b)
2 2

1 2
.

(c)

1

1 2

1 1
.

(d)
2 2

1 2
.

MCQ II

14.12 The rotation of earth about its axis is

(a) periodic motion.
(b) simple harmonic motion.
(c) periodic but not simple harmonic motion.
(d) non-periodic motion.

14.13 Motion of a ball bearing inside a smooth curved bowl, when
released from a point slightly above the lower point is

(a) simple harmonic motion.
(b) non-periodic motion.
(c) periodic motion.
(d) periodic but not S.H.M.

14.14 Displacement vs. time curve for a particle executing S.H.M. is
shown in Fig. 14.4. Choose the correct statements.

Fig. 14.4

Fig. 14.3

(a) Phase of the oscillator is same at t = 0 s and
t = 2 s.

(b) Phase of the oscillator is same at t = 2 s and
t = 6 s.

(c) Phase of the oscillator is same at t = 1 s and
t = 7 s.

(d) Phase of the oscillator is same at t = 1 s and
t = 5 s.

14.15 Which of the following statements is/are true for a simple
harmonic oscillator?

(a) Force acting is directly proportional to displacement from the
mean position and opposite to it.

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Oscillations

101

(b) Motion is periodic.
(c) Acceleration of the oscillator is constant.
(d) The velocity is periodic.

14.16 The displacement time graph of a particle executing S.H.M. is
shown in Fig. 14.5. Which of the following statement is/are true?

(a) The force is zero at
3
4
T

t .

(b) The acceleration is maximum at
4
4
T

t .

(c) The velocity is maximum at
4
T

t .

(d) The P.E. is equal to K.E. of oscillation at
2
T

t .

14.17 A body is performing S.H.M. Then its

(a) average total energy per cycle is equal to its maximum kinetic
energy.

(b) average kinetic energy per cycle is equal to half of its
maximum kinetic energy.

(c) mean velocity over a complete cycle is equal to
2

times of its

maximum velocity.

(d) root mean square velocity is
1

2
times of its maximum velocity.

14.18 A particle is in linear simple harmonic motion between two points
A and B, 10 cm apart (Fig. 14.6). Take the direction from A to B
as the + ve direction and choose the correct statements.

Fig. 14.6

Fig.14.5

d
is

p
la

ce
m

en
t

0
T/4

2T/4

3T/4 T 5T/4 time (s)

(a) The sign of velocity, acceleration and force on the particle when
it is 3 cm away from A going towards B are positive.

(b) The sign of velocity of the particle at C going towards O is
negative.

(c) The sign of velocity, acceleration and force on the particle when
it is 4 cm away from B going towards A are negative.

(d) The sign of acceleration and force on the particle when it is at
point B is negative.