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CBSE

Subject

Physics

NEET Physics : Mechanical Properties of Solids

Multiple Choice Questions

31.

Assertion: Transverse sound wave does not occurs in gases.

Reason: Gases cannot sustain shearing strain.

If both assertion and reason are true and the reason is correct explanation of assertion.
If both assertion and reason are true but reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

32.

For a constant hydraulic stress on an object, the fractional change in the object's volume ( ΔV/V ) and its bulk modulus (B) are related as

$\frac{∆ V}{V} \propto B$
$\frac{∆ V}{V} \propto \frac{1}{B}$
$\frac{∆ V}{V} \propto B^{2}$
$\frac{∆ V}{V} \propto B^{- 2}$

33.

Which of the following graph depicts spring constant k versus length l of the spring correctly?

34.

Young's modulus for a steel wire is 2 x 10¹¹ Pa and its elastic limit is 2.5 x 10⁸ Pa. By how much can a steel wire 3 m long and 2 mm in diameter be stretched before the elastic limit is exceeded?

3.75 mm
7.50 mm
4.75 mm
4.00 mm

35.

A body of mass 5 kg moving with a speed of 1.5 m/s on a horizontal smooth surface collides with a nearly weightless spring of force constant k = 5 N/m. The maximum compression of the spring would be

0.5 m
0.15 m
1.5 m
0.12 m

36.

Assertion: The size of a hydrogen balloon increases as it rises in air.

Reason: The material of the balloon can be easily stretched.

if both assertion and reason are true and the reason is the correct explanation of the assertion
if both assertion and reason are true and the reason is not the correct explanation of the assertion
if assertion is true but reason is false
if both assertion and reason are false statements

37.

Shear modulus is zero for

solids
liquids
gases
liquids and gases

38.

The equivalent resistance between the points X and Y in the following circuit diagram will be

10 Ω
5 Ω
7 Ω
3 Ω

39.

If a wire is extended to a new length l, the work done is

$\frac{Y A}{l} (l - l')$
$\frac{YA}{l} {(l - l')}^{2}$
$\frac{1}{2} \frac{YA}{l} {(l - l')}^{2}$
$2 . \frac{YA}{l} {(l - l')}^{2}$

40.

Assertion: The size and shape of the rigid body remains unaffected under the effect of external forces.

Reason: The distance between two particles remains constant in a rigid body.

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false

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