A metallic rod of Young's modulus 2x1011 N/m2 undergoes

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

81.

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

      

  • 10 Ω

  • 5 Ω

  • 7 Ω

  • 3 Ω


82.

Shear modulus is zero for

  • solids

  • liquids

  • gases

  • liquids and gases


83.

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

  • VV  B

  • VV  1B 

  • VV  B2

  • VV B-2


84.

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


Advertisement
85.

The breaking stress of a wire depends upon

  • length of  the wire

  • material of the wire

  • radius of the wire

  • shape of the cross-section


86.

Assertion: Stress is the internal force per unit area of a body.

Result: Rubber is more elastic than steel.

  • If both the assertion and reason are true and reason is a correct explanation of the assertion.

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

  • If the assertion is true but the reason is false.

  • If both assertion and reason are false.


87.

A body weighs 200 N at the surface of earth. If it be placed in an artificial satellite revolving at height where acceleration due to gravity is half of that at earth's surface. It will weigh

  • 2×109 N/m2

  • 2 ×108 N/m2

  • 2×106 N/m2

  • 2× 104 N/m2


88.

A metal wire of length l, area of cross-section A and Young's modulus Y behaves as a spring of spring constant k given by

  • k= YAl

  • k= 2YAl

  • k= YA2l

  • k= YlA


Advertisement
89.

The breaking strength of a rod of diameter 2 cm is 2x 105 N. Then that for rod of same material but diameter 4 cm will be

  • 2 × 105 N

  • 1 × 105 N

  • 8 × 105 N

  • 0.5 × 105 N


Advertisement

90.

A metallic rod of Young's modulus 2x1011 N/m2 undergoes a strain of 0.5%. Then the energy stored per unit volume in the rod will be

  • 2.5 × 106 J/m3

  • 5 × 108 J/m3

  • 2.5 × 108 J/m3

  • 0.5 × 1011 J/m3


A.

2.5 × 106 J/m3

Energy stored per unit volume

12 = Y × (strain)2

= 12 × 2 × 1011 × 0.51002 = 2.5 × 106 J/m3


Advertisement
Advertisement