Physics-Some Mechanical Properties of Matter

Test Preparation on Physics-Some Mechanical Properties Of Matter

1.

A one metre long steel wire of cross-sectional area1 mm2 is extended by 1 mm. If Y = 2 x 1011 Nm-2 , thenthe work done is :

10.1 J
20.2 J
30.3 J
40.4 J

F = YA ?L Work done 1/2 F?L = 1/2 x YA?L2/L 2 x 1011

2.

A long rod of radius 1 cm and length 2 m which is fixedat one end is given a twist of 0.8 radian. The shear straindeveloped will be :

10.002
20.004
30.008
40.016

3.

Two wires of the same material and length are stretchedby the same force. Their masses are in the ratio 3 : 2, theirelongations are in the ratio :

13 : 2
29 : 4
32 : 3
44 : 9

Y = FL/A ?L or ?L

4.

A long wire hangs vertically with its upper end clamped.A torque of 8 Nm applied to the free end twisted it Hthrough45

1p joule
2p / 2 joule
3p/4 joule
4p/8 joule

5.

Theoretically the value of Poisson's ratio s lies between :

10 < s < 1
2-1 < s < 0.5
30.2 < s < 0.4
4-1 < s < 1

6.

When a rubber cord is stretched, the change in volumewith respect to change in its linear dimension isnegligible, the Poisson's ratio for rubber is :

11
20.25
30.5
40.75

7.

A uniform rod suffers a longitudinal strain of 2 x 10-3.The Poisson's ratio of the material of the rod is 0.50. Thepercentage change in volume is :

1zero
20.1
30.2
40.6

8.

A cable that can support a load of 800 N is cut into twoequal parts. The maximum load that can be supportedby either part is :

1100 N
2400 N
3800 N
41600 N

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