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Question (1)

QN0035510

According to Hooke's law of elasticity, if stress is increased, then the ratio of stress to strain

(A)
becomes zero
(B)
decreases
(C)
remains constant
(D)
increases

Correct Answer: B

Explanation:

The ratio of stress to strain is always constant. If stress is increased, strain will also increase so that their ratio remains constant.

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Question (2)

QN0035511

Which of the following affects the elasticity of a substance?

(A)
Hammering and annealing
(B)
Change in temperature
(C)
Impurity in substance
(D)
All of the above

Correct Answer: D

Explanation:

The hammering increases elasticity while annealing decreases it. The increase in temperature increases the elasticity while decrease in temperature decreases it. The impurity in the substance increases the elasticity.

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Question (3)

QN0035512

The length of a metal is when the tension in it is and is when the tension is . The original length of the wire is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

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Question (4)

QN0035513

The length of an elastic string is metre when the longitudinal tension is and metre when the longitudinal tension is . The length of the string in metre when the longitudinal tension is is

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

Using Hooke's law, we can write

and

If be the length under tension , then

After solving above equations, we get

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Question (5)

QN0035514

A wire of length is hanging from a fixed support. The length changes to and when masses and are suspended respectively from its free end. Then the value of is equal to:

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

When length ' ' is hanging from fixed support

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Question (6)

QN0035515

The area of cross-section of the rope used to lift a load by a crane is . The maximum lifting capacity of the crane is 10 metric tons. To increase the lifting capacity of the crane to 25 metric tons, the required area of crosssection of the rope should be : take )

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

Since breaking stress (Maximum lifting capacity) is the property of material so it will remain same.

breaking stress

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Question (1)

According to Hooke's law of elasticity, if stress is increased, then the ratio of stress to strain

Explanation:

Link:

Question (2)

Which of the following affects the elasticity of a substance?

Explanation:

Link:

Question (3)

The length of a metal is when the tension in it is and is when the tension is . The original length of the wire is

Explanation:

Link:

Question (4)

The length of an elastic string is metre when the longitudinal tension is and metre when the longitudinal tension is . The length of the string in metre when the longitudinal tension is is

Explanation:

Link:

Question (5)

A wire of length is hanging from a fixed support. The length changes to and when masses and are suspended respectively from its free end. Then the value of is equal to:

Explanation:

Link:

Question (6)

The area of cross-section of the rope used to lift a load by a crane is . The maximum lifting capacity of the crane is 10 metric tons. To increase the lifting capacity of the crane to 25 metric tons, the required area of crosssection of the rope should be : take )

Explanation:

Link:

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