The diagrams represent the potential energy U as a function of interatomic separation r. Which of the following diagrams corresponds to stable molecules found in nature?
1.
2.
3.
4.
The maximum load that a wire can bear is W. If the wire is cut to half of its length, then the maximum load it can sustain is:
1.
2.
3.
4. W
Two wires and of the same length are made of the same material. The figure represents the load versus extension graph for the two wires. Hence:
1. | Modulus of elasticity of is greater than that of . |
2. | Stiffness of is more than that of . |
3. | The cross-sectional area of is less than that of . |
4. | All of these |
When a helical spring is stretched, then the kind of strain produced in it is:
(1) Longitudinal
(2) shear
(3) Volumetric
(4) Longitudinal and Shear
If stress versus strain plot for a metal at two different temperatures are shown below, then:
1.
2.
3.
4.
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. |
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
The ratio of Young's modulus of wire to wire is:
1.
2.
3.
4.
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. |
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. |