Page 138 - Physics - XI

Q7. What would happen, if the resonant tube is vertical? (NCERT)
Ans. According to the experimental procedure, the resonant tube should be set vertical fi rstly because
the whole experimental apparatus and its procedure depend upon its position. Moreover, if it is not
vertical, then it would lead to an error in the result.

COMPETENCY-BASED QUESTIONS
COMPETENCY-BASED QUESTIONS

Multiple Choice Questions
Q1. A 1 kg block attached to a spring vibrates with a frequency of 1 Hz on a frictionless horizontal

table. Two springs identical to the original spring are attached in parallel to an 8 kg block
placed on the same table. So, the frequency of vibration of the 8 kg block is

1 1 1
a. 2 Hz b. Hz c. Hz d. Hz
4 22 2
Q2. A mass M attached to a horizontal spring executes S.H.M. with amplitude A . When the mass
1
M passes through its mean position, then a smaller mass m is placed over it and both of them

A
is
move together with amplitude A . The ratio of A 1 2
2

a. M + m b. M 12/ c. M m 12/ d. M

M M m M M + m
Q3. A spring is stretched by 5 cm by a force 10 N. The time period of the oscillation when a mass
of 2 kg is suspended by it is
a. 3.14 s b. 0.628 s c. 6.28 s d. 0.0628 s
Q4. The displacement of a particle along the X-axis is given by x = a sin ωt. The motion of the
2
particle corresponds to

a. non-simple harmonic motion b. simple harmonic motion of frequency ω/2π
c. simple harmonic motion of frequency ω/π d. simple harmonic motion of frequency 3ω/2π.

Q5. The period of oscillation of a mass M suspended from a spring of negligible mass is T. If along
with it another mass M is also suspended, the period of oscillation will now be

a. 2T b. 2T c. T d. T /2

Q6. Which represents S.H.M. out of the following functions representing motion of a particle?

3
(i) y = sin ωt – cos ωt (ii) y = sin ωt (iii) y 5cos 3 t (iv) y = 1 + ωt + ω t
2 2
3

4
a. only (i) b. only (iv)
c. only (i) and (iii) d. only (i) and (ii)

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