A rod of length l and radius r is held between two rigid walls so that it is not allowed to expand. If its temperature is increased, then the force developed in it is proportional to
1. l
2.
3.
4.
A uniform cubical block is subjected to volumetric compression, which decreases its each side by 2%. The Bulk strain produced in it is
1. 0.03
2. 0.02
3. 0.06
4. 0.12
A material has Poisson's ratio 0.5. If a uniform rod of it suffers a longitudinal strain of , what will be percentage increase in volume?
1. 2%
2. 3%
3. 5%
4. 0%
Hooke's law is applicable for:
1. | elastic materials only | 2. | plastic materials only |
3. | elastomers only | 4. | all of these |
When a load of 10 kg is suspended on a metallic wire, its length increase by 2mm. The force constant of the wire is
1.
2.
3.
4.
The figure shows the graph between stress and strain for a uniform wire at two different temperatures. Then:
1.
2.
3.
4. None of these
If two different types of rubber are found to have stress-strain curves as shown, then:
1. | A is suitable for shock absorbers. |
2. | B is suitable for shock absorbers. |
3. | B is suitable for car tires. |
4. | None of these |
The stress-strain graphs for two materials \(A\) and \(B\) are shown in the figure. The graphs are drawn to the same scale. Select the correct statement:
1. | material \(A\) has a greater Young's Modulus. |
2. | material \(A\) is ductile. |
3. | material \(B\) is brittle. |
4. | all of these. |
The load versus elongation graph for four wires of same length and the same material is shown in figure. The thinnest wire is represented by line:
1. OC
2. OD
3. OA
4. OB
In the given figure, if the dimensions of the two wires are the same but materials are different, then Young's modulus is
1. More for A than B
2. More for B than A
3. Equal for A and B
4. None of these