NEET

Elastomers are the materials which

are not elastic at all
have very small elastic range
do not obey Hooke’s law
None of these

The load versus elongation graph for four wires is shown.The thinnest wire is

Which of the following affects the elasticity of a substance?

hammering and annealing
change in temperature
impurity in substance
All of these

Which of the following has no dimensions ?

strain
angular velocity
momentum
angular momentum

Minimum and maximum values of Possion’s ratio for a metallies between

– ∞ to + ∞
0 to 1
– ∞ to 1
0 to 0.5

In solids interatomic forces are

totally repulsive
totally attractive
both (a) and (b)
None of these

Which one of the following is not a unit of Young’s modulus ?

Nm^-1
Nm^-2
dyne cm^-2
mega pascal

A cube is subjected to a uniform volume compression. If the side of the cube decreases by 2% the bulk strain is

0.02
0.03
0.04
0.06

The value of tan (90 – θ) in the graph gives

Young's modulus of elasticity
compressibility
shear strain
tensile strength

Solution

\(tan(90-\Theta )=\frac{stress}{strain}\)

A wire suspended vertically from one of its ends is stretched by attaching a weight of 200N to the lower end.The weight stretches the wire by 1mm. Then the elastic energy stored in the wire is

0.2 J
10 J
20 J
0.1 J

Solution

Elastic energy\(=\frac{1}{2}\times F\times X\)

F =200 N, x = 1mm = 10^-3 m

∴E\(=\frac{1}{2}\times 200\times 1\times 10^{-3}=0.1J\)

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