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. 1l
3. r2
4. r-2
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 3×10-3, 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. 3×104 N/m
2. 2.5×103 N/m
3. 5×104 N/m
4. 7.5×103 N/m
The figure shows the graph between stress and strain for a uniform wire at two different temperatures. Then:
1. T1>T2
2. T2>T1
3. T1=T2
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