Question # 1

The restoring force is ______ and opposite tot he applied force within ______

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Equal, Elastic limit

Different, The walls of the laboratory

Different, Elastic limit

None of these

When a body is vibrating, the displacement from mean position

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Increases with time

Decreases with time

Changes with time

None of these

The body oscillates due to ______ accelerates and overshoots the rest position due to _____:

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Applied force , inertia

Restoring force, friction

Frictional force, inertia

Restoring force, inertia

The unit of spring constant is

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J-sec

Metre

Nm^-1

None of these

The S.I unit of frequency is

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Vibrations s^-2

Ms^-1

Hertz

s^-1

To and from motion of a body about its mean position is known as:

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Translatory motion

Vibratory motion

Rotatory motion

None of these

If mass of 10 gm is suspended from a spring of K=0.8 Nm^-1then the extension will be:

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10 cm

1 m

10 mn

None of these

The SI unit of spring constant is identical with that of:

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Force

Surface tension

Pressure

Loudness

A spring of constant k = 0.4 N m^-1_{is to be extended thorugh 10 cm at a place where g = 10 m sec}^-2. The mass to be suspended should be:

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4 gms

0.4 gms

40 gms

None of these

The acceleration of body executing SHM is directly proportional to

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Applied force

Amplitude

Displacement

Frictional force

If a force of 0.05 N produces an elongation of 20 mm in a string, then its spring constant will be:

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250 N m^-1

25 N m^-1

2.5 N m^-1

None of these

The wave form of SHM is

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Pulsed wave

Square wave

Triangular waved

Sine wave

When quarter of a circle is completed, the phase of vibration is:

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90°

180°

45°

360°

Acceleration of body executing SHM is always directed towards

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Extreme position

Mean position

Along the direction of motion

None

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