Given below are two statements:
Statement I: | Almost for all metals, the modulus of elasticity decreases with a rise in temperature. |
Statement II: | By increasing temperature, the intermolecular force decreases. |
1. | Statement I is false but Statement II is true. |
2. | Both Statement I and Statement II are true. |
3. | Both Statement I and Statement II are false. |
4. | Statement I is true but Statement II is false. |
The Poisson's ratio of a material is If a force is applied to a wire of this material, there is a decrease in the cross-section area by %. In such a case the percentage increase in its length will be:
1. | % | 2. | % |
3. | % | 4. | % |
For a given material, Young's modulus is 2.4 times the modulus of rigidity. Its Poisson's ratio is-
1. 0.1
2. 0.15
3. 0.2
4. 0.4
Given below are two statements:
Statement I: | Air is more elastic than iron. |
Statement II: | Elasticity is directly proportional to Bulk modulus and the Bulk modulus of air is more than that of steel. |
1. | Statement I is false but Statement II is true. |
2. | Both Statement I and Statement II are true. |
3. | Both Statement I and Statement II are false. |
4. | Statement I is true but Statement II is false. |
Given below are two statements:
Assertion (A): | Hooke's law is applicable up to the elastic limit. |
Reason (R): | Up to the elastic limit, stress is directly proportional to strain. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Given below are two statements:
Statement I: | Rubber is more elastic than steel. |
Statement II: | Deformation in steel is less than rubber for equal forces |
1. | Statement I is false but Statement II is true. |
2. | Both Statement I and Statement II are true. |
3. | Both Statement I and Statement II are false. |
4. | Statement I is true but Statement II is false. |
The ratio of Young's modulus of wire to wire is:
1.
2.
3.
4.
In which of the following cases, an elastic metal rod will not undergo elongation?
(1) The rod falls freely.
(2) It is pulled with constant acceleration on a smooth surface.
(3) It is pulled with constant velocity on a rough surface.
(4) All of these
A metallic rope of diameter breaks at force. If the wire of the same material has a diameter of then the breaking force is:
1. | 2. | ||
3. | 4. |
If stress versus strain plot for a metal at two different temperatures are shown below, then:
1.
2.
3.
4.