Time Left - 30:00 mins

Class XI Physics Mechanics of Solid 3

Attempt now to get your rank among 417 students!

Question 1

A force F is required to break a wire of length l and radius r. What force is required to break a wire, of same material having twice the length and six times the radius?

Question 2

In a wire stretched by hanging a weight from its end, the elastic potential energy per unit volume in terms of the longitudinal strain σ and modulus of elasticity Y is

Question 3

The following four wires of Length L and radius r are made of the same material. Which of these will have the largest extension, when the same tension is applied?

Question 4

A wire of initial length L and radius r is stretched by a length I. Another wire of same material but with initial length 2I and radius 2r is stretched by a length 2I. The ratio of the stored elastic energy per unit volume in the first and second wire is

Question 5

A material has Poisson’s ratio 0.50. If a uniform rod of it suffers a longitudinal strain of $Description: E:\WBJEE\2011\2011_Physics_files\image085.png$ , then the percentage change in volume is

Question 6

The length of a metal wire is L₁ when the tension is T₁ and L₂ when the tension is T₂. The unscratched length of the wire is

Question 7

Let L be the length and d be the diameter of cross section of a wire. Wires of the same material with different L and d are subjected to the same tension along the length of the wire. In which of the following cases, the extension of wire will be the maximum?

Question 8

If S is stress and Y is Young's modulus of material of a wire, the energy stored in the wire per unit volume is

417 attempts
11 upvotes
14 comments

Tags :

Jun 15JEE & BITSAT