A block $A$ is placed on a spring and causes it to be compressed; when another block $B$ is placed on top of the first one the compression increases by $125\%.$ The time period of small oscillations is $T_A$ when $A$ is present, and is $T_{AB},$ when both $A~\&~B$ are present. Then,

1. $T_{AB}=\dfrac{3}{2}~T_A$ 2. $T_{AB}=\dfrac{\sqrt5}{2}~T_A$

3. $T_{AB}=\dfrac{1}{2}~T_A$ 4. $T_{AB}=\dfrac{2}{3}~T_A$

Subtopic: Spring mass system |

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Q12:

A light rod

A B

$AB$ is hinged at

A

$A$ so that it is free to rotate about

A .

$A.$ It is initially horizontal with a small block of mass

m

$m$ attached at

B,

$B,$ and a spring (constant -

k

$k$ ) holding it vertically up at its mid-point. The time period of vertical oscillations of the system is:

1.	$2 \pi \sqrt{\dfrac{m}{k}}$	2.	$\pi \sqrt{\dfrac{m}{k}}$
3.	$4\pi \sqrt{\dfrac{m}{k}}$	4.	$\dfrac{\pi}{2} \sqrt{\dfrac{m}{k}}$

Subtopic: Spring mass system |

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Q13:

A particle moves in a plane such that its displacements are the sum of two displacements

{\to r}_{1}

$\vec{ r}_1$ , and

{\to r}_{2};

$\vec{r}_2;$ each of which undergo SHM in opposite phase with respect to the other, but of unequal amplitude. The resultant motion of the particle is:

1.	uniform circular motion
2.	elliptical motion
3.	linear SHM
4.	angular SHM along a circle

Subtopic: Simple Harmonic Motion |

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Q14:

A block of mass

m

$m$ is pushed towards a spring of spring constant

k,

$k,$ with a speed

u .

$u.$ It is very close to the spring, initially. After a time

t,

$t,$ the block rebounds and returns to its initial position. If

u

$u$ is increased, then:

1.	$t$ increases.
2.	$t$ decreases.
3.	$t$ remains unchanged.
4.	the effect on $t$ cannot be determined due to insufficient information.

Subtopic: Spring mass system |

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Q15:

Two springs are joined end-to-end and connected to a block of mass

m .

$m.$ The angular frequency

(ω)

$(\omega)$ of oscillation is:

1.	$\sqrt{\dfrac{2k}{3m}}$	2.	$\sqrt{\dfrac{3k}{2m}}$
3.	$\sqrt{\dfrac{3k}{m}}$	4.	$\sqrt{\dfrac{k}{3m}}$

Subtopic: Spring mass system |

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Q16:

Two identical simple pendulums are compared, one

(A)

$(A)$ located on the surface of the earth and the other

(B)

$(B)$ – at a height

(h)

$(h)$ above the earth's surface:

h = \frac{R}{1000} .

$h=\dfrac{R}{1000}.$
Their time periods are related as:
1.

T_{A} (1 + \frac{1}{1000}) = T_{B}

$T_A\Big(1+\dfrac{1}{1000}\Big)=T_B$
2.

T_{B} (1 + \frac{1}{1000}) = T_{A}

$T_B\Big(1+\dfrac{1}{1000}\Big)=T_A$
3.

T_{A} (1 + \frac{1}{2000}) = T_{B}

$T_A\Big(1+\dfrac{1}{2000}\Big)=T_B$
4.

T_{B} (1 + \frac{1}{2000}) = T_{A}

$T_B\Big(1+\dfrac{1}{2000}\Big)=T_A$

Subtopic: Angular SHM |

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Q17:

A particle undergoes SHM with an amplitude of

10

$10$ cm and a time period of

4

$4$ s. The average velocity of the particle during the course of its motion from its mean position to its extreme position is:
1.

5

$5$ cm/s
2.

10

$10$ cm/s
3. at least

10

$10$ cm/s
4. at most

10

$10$ cm/s

Subtopic: Simple Harmonic Motion |

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Q18:

Two SHMs of the form:

$x=A+A\text{sin}\omega t\\ y=A-A\text{sin}\omega t$
are superposed on a particle, along

$x$ and

$y$ directions. The resultant of these motions is:

1.	circular motion
2.	SHM along $x$ -axis
3.	SHM along $y$ -axis
4.	SHM, but along a direction other than $x$ or $y$ -axis

Subtopic: Simple Harmonic Motion |

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Q19:

Given below are two statements:

Statement I:	If the acceleration of a particle is directed towards a fixed point, and proportional to the distance from that point – the motion is SHM.
Statement II:	During SHM, the kinetic energy of the particle oscillates at twice the frequency of the SHM.

1.	Statement I is incorrect and Statement II is correct.
2.	Both Statement I and Statement II are correct.
3.	Both Statement I and Statement II are incorrect.
4.	Statement I is correct and Statement II is incorrect.

Subtopic: Energy of SHM |

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Q20:

Match the types of motion in List-I with their corresponding examples in List-II.

List-I		List-II
(a)	motion with constant speed	(i)	SHM
(b)	motion with constant acceleration	(ii)	uniform circular motion
(c)	oscillatory motion	(iii)	projectile motion
(d)	random motion	(iv)	molecular motion in gas

Choose the correct option from the given ones:

1.	(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
2.	(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
3.	(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
4.	(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

Subtopic: Simple Harmonic Motion |

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1.	$T_{AB}=\dfrac{3}{2}~T_A$	2.	$T_{AB}=\dfrac{\sqrt5}{2}~T_A$
3.	$T_{AB}=\dfrac{1}{2}~T_A$	4.	$T_{AB}=\dfrac{2}{3}~T_A$

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