A wire of diameter 1mm breaks under a tension of 1000 N. Another wire, of the same material as that of the first one, but of diameter 2 mm, breaks under a tension of:
(1) 500 N
(2) 1000 N
(3) 10000 N
(4) 4000 N
There is no change in the volume of a wire due to change in its length on stretching. The Poisson's ratio of the material of the wire is
(1) + 0.50
(2) – 0.50
(3) 0.25
(4) – 0.25
The force required to stretch a steel wire of cross-section to 1.1 times its length would be
(1)
(2)
(3)
(4)
The ratio of two specific heats of gas for argon is 1.6 and for hydrogen is 1.4. Adiabatic elasticity of argon at pressure P is E. Adiabatic elasticity of hydrogen will also be equal to E at the pressure :
(1) P
(2)
(3)
(4) 1.4P
A fixed volume of iron is drawn into a wire of length L. The extension x produced in this wire by a constant force F is proportional to:
(1)
(2)
(3)
(4) L
The length of an elastic string is a metre when the longitudinal tension is 4 N and b metre when the longitudinal tension is 5 N. The length of the string in metre when the longitudinal tension is 9 N is
(1) a - b
(2) 5b - 4a
(3) 2b -
(4) 4a - 3b
How much force is required to produce an increase of 0.2% in the length of a brass wire of diameter 0.6 mm ?
(Young’s modulus for brass = )
(a) Nearly 17 N (b) Nearly 34 N
(c) Nearly 51 N (d) Nearly 68 N
A 5 m long aluminium wire of diameter 3 mm supports a 40 kg mass. In order to have the same elongation in a copper wire of the same length under the same weight, the diameter of the copper wire should be, in mm:
(a) 1.75 (b) 1.5
(c) 2.5 (d) 5.0
A steel wire of 1 m long and cross section area is hang from rigid end. When mass of 1kg is hung from it then change in length will be: (given )
(1) 0.5 mm
(2) 0.25 mm
(3) 0.05 mm
(4) 5 mm
An iron rod of length 2m and cross section area of 50 X , is stretched by 0.5 mm, when a mass of 250 kg is hung from its lower end. Young's modulus of the iron rod is-
(1)
(2)
(3)
(4)