# IIT JEE/IIT JEE Elasticity Sample Test,Sample questions

1.0.002

2.0.004

3.0.008

4.0.016

1.0.02

2.0.1

3.0.005

4.0.002

1.F / 2

2.2F

3.4F

4.F / 4

1.F

2.3 F

3.9 F

4.36 F

1.0.05

2.0.1

3.0.2

4.0.4

## Question: `A load suspended by a massless spring produces an extension of x cm in equilibrium. When it is cut into two unequal parts the same load produces an extension of 7.5 cm when suspended by the large part of length 60 cm. When it is suspended by the smaller part the extension is 5.0 cm. then:`

1.x = 12.5

2.x = 3.0

3.the length of the original spring is 90 cm

4.the length of the original spring is 80 cm

1.1%

2.2%

3.2.50%

4.3%

1.K / 2

2.K / 3

3.2K / 3

4.3K / 2

1.40 N

2.80 N

3.320 N

4.1640 N

## Question: `A uniform wire fixed at its upper end hangs vertically and supports a weight at its lower end. If its radius is r its length L and Young s modulus for the material of the wire is E the extension is (1) directly proportional to E(2) inversely proportional to r.(3) directly proportional to L`

1.if 1 2 3 are correct

2.if 1 2 are correct

3.if 2 3 are correct

4.if 3 only is correct

1.2.5 kg

2.5 kg

3.10 kg

4.15 kg

1.1

2.21

3.zero

4.1/2.

1.8

2.4

3.2

4.1

1.1 / 2 mm

2.1 / 4 mm

3.1 / 8 mm

4.1 / 16 mm

1.l / 2

2.l

3.2l

4.4l

1.0.2 J

2.10 J

3.20 J

4.0.1 J

1.0.1

2.0.2

3.0.3

4.0.4

## Question: `For gases:`

1.isothermal elasticity is greater than adiabatic elasticity

2.adiabatic elasticity is greater than isothermal elasticity

3.both the elasticities are equal

4.none of the above

## Question: `Four wires of the same material are stretched by the same load. The dimensions of the wires are as given below. The one which has the maximum elongation is of:`

1.diameter 1 mm and length 1 m

2.diameter 2 mm and length 2 m

3.diameter 0.5 mm and length 0.5 m

4.diameter 3 mm and length 3 m

1.YA/L

2.YA/2L

3.2YA/L

4.YL/A

1.1 / J

2.4 J

3.8 J

4.16 J

## Question: `On what factor should the coefficient of restitution depend when two bodies having masses m and M (m < M) collide with each other?`

1.Coefficient of restitution depends upon Youngs modulus of elasticity of heavier body only

2.Coefficient of restitution depends upon Youngs modulus of elasticity of lighter body only

3.Coefficient of restitution depends upon Youngs modulus of elasticity of both the bodies

4.Coefficient of restitution depends upon Nature of collision (wheather it is head on or oblique)

## Question: `The dimensions of four wire of the same material are given below. In which wire the increase in length will be maximum ?`

1.Length 100 cm Diameter 1 mm

2.Length 200 cm Diameter 2 mm

3.Length 300 cm Diameter 3 mm

4.Length 50 cm Diameter 0.5 mm.

1.0.01%

2.0.02%

3.0.03%

4.0.04%

1.0.25 mm

2.0.5 mm

3.2 mm

4.1 mm

1.5b - 4a

2.4a - 5b

3.a + b

4.b - a

1.4a ? 5b

2.5b ? 4a

3.9b ? 9a

4.a + b

## Question: `The longitudinal extension of any elastic material is very small. In order to have an appreciable change the material must be in the form of:`

1.thin block of any cross-section

2.thick block of any cross-section

3.long thin wire

4.short thin wire

## Question: `The modulus of elasticity is dimensionally equivalent to:`

1.surface tension

2.stress

3.strain

4.none of these

1.ductility

2.malleability

3.brittleness

4.elasticity

## Question: `The Youngs modulus of a wire is numerically equal to the stress which will:`

1.not change the length of the wire

2.double the length of the wire

3.increase the length by 50%

4.change the radius of the wire to half

## Question: `Three wires PQ and R of the same material and length have radii 0.1 cm 0.2 cm and 0.3 cm respectively. Which wire has the highest value of Young s modulus of elasticity ?PQR`

1.P

2.Q

3.R

4.All have the same value

1.16

2.8

3.4

4.1

1.1:03

2.2:01

3.3:01

4.4:01

1.1:01

2.1:02

3.1:03

4.1:04

1.3:02

2.9:04

3.2:03

4.4:09

1.3:02

2.9:04

3.2:03

4.4:09

1.1:02

2.2:01

3.1:03

4.1:08

1.3:02

2.2:03

3.4:09

4.9:04

## Question: `What happen to the elastic property of a substance after annealing (cooling slowly after heating)?`

1.Increases

2.Decreases

3.Remains as such

4.Becomes zero

1.4.9 J

2.2.45 J

3.0.495 J

4.0.245 J

1.0.5 cm

2.2 cm

3.4 cm

4.8 cm

1.1

2.0.25

3.0.5

4.0.75

1.1.2 cm

2.0.6 cm

3.0.3 cm

4.0.15 cm

1.1.2 cm

2.0.6 cm

3.0.3 cm

4.0.15 cm

## Question: `When the intermolecular distance decreases due to compressive force there is:`

1.zero resultant force between molecules

2.repulsive force between molecules

3.attractive force between molecules

4.no force between molecules

1.Steel

2.Rubber

3.Wood

4.Plastic

## Question: `You are given three wires A B and C of the same length and cross-section. They are each stretched by applying the same force to the ends. The wire A is stretched least and comes back to its original length when the stretching force is removed. The wire B is stretched more than A and also comes back to its original length when the stretching force is removed. The wire C is stretched most and remains stretched even when stretching force is removed. The greatest Young s modulus of elasticity is possessed by the material of wireABC`

1.A

2.B

3.C

4.Data is not sufficient

1.finite

2.one

3.zero

4.infinity

1.solid

2.liquid

3.gas

4.all of these

## More MCQS

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