IIT JEE Questions And Answers :: Elasticity: part1

IIT JEE : Elasticity QUESTIONS AND ANSWERS :: part1 : 1 to 5

Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2014 examinations :

Elasticity : 1.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:

x = 12.5
x = 3.0
the length of the original spring is 90 cm
the length of the original spring is 80 cm

Elasticity : 2.A force F is needed to break a copper wire having radius R. The force needed to break a copper wire of same length and radius 2R will be

F / 2
F / 4

Elasticity : 3.When a weight of 5 kg is suspended from a copper wire of length 30 m and radius 0.5 mm, the length of the wire increases by 2.4 cm. If the radius is doubled, the extension produced is:

1.2 cm
0.6 cm
0.3 cm
0.15 cm

Elasticity : 4.If a bar is made of copper whose coefficient of linear expansion is one and a half times that of iron, the ratio of the force developed in the cross-sections, when heated through the same temperature range (Young s modulus for copper may be taken to be equal to that of iron) is

3 /2
2 / 3
9 / 4
4 / 9

Elasticity : 5.For gases:

isothermal elasticity is greater than adiabatic elasticity
adiabatic elasticity is greater than isothermal elasticity
both the elasticities are equal
none of the above

More Elasticity QUESTIONS AND ANSWERS available in next pages

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