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8
MCQ (Single Correct Answer)

Figure shows the circular motion of a particle. The radius of the circle, the period, sense of revolution and the initial position are indicated on the figure. The simple harmonic motion of the $x$-projection of the radius vector of the rotating particle $P$ is

A
$x(t)=B \sin \left(\frac{2 \pi t}{30}\right)$
B
$x(t)=B \cos \left(\frac{\pi t}{15}\right)$
C
$x(t)=B \sin \left(\frac{\pi t}{15}+\frac{\pi}{2}\right)$
D
$x(t)=B \cos \left(\frac{\pi t}{15}+\frac{\pi}{2}\right)$
9
MCQ (Single Correct Answer)

The equation of motion of a particle is $x=a \cos (\alpha t)^2$. The motion is

A
periodic but not oscillatory
B
periodic and oscillatory
C
oscillatory but not periodic
D
neither periodic nor oscillatory
10
MCQ (Single Correct Answer)

A particle executing SHM has a maximum speed of $30 \mathrm{~cm} / \mathrm{s}$ and a maximum acceleration of $60 \mathrm{~cm} / \mathrm{s}^2$. The period of oscillation is

A
$\pi \mathrm{sec}$
B
$\frac{\pi}{2} \mathrm{sec}$
C
$2 \pi \mathrm{sec}$
D
$\frac{\pi}{t} \mathrm{sec}$
11
MCQ (Multiple Correct Answer)

When a mass $m$ is connected individually to two springs $S_1$ and $S_2$, the oscillation frequencies are $v_1$ and $v_2$. If the same mass is attached to the two springs as shown in figure, the oscillation frequency would be

A
$v_1+v_2$
B
$\sqrt{v_1^2+v_2^2}$
C
$\left(\frac{1}{v_1}+\frac{1}{v_2}\right)^{-1}$
D
$\sqrt{v_1^2-v_2^2}$
12
MCQ (Multiple Correct Answer)

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
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