A 4 m long copper wire of cross-sectional area 1.2 cm2 is stretched by a force of 4.8 x 103 N. Young's modulus for copper is Y = 1.2 x 1011 N/m2, the increase in length of the wire is
1.32 mm
0.8 mm
0.48 mm
5.36 mm
A wire of length L and cross-sectional area A is made of a material of Young's modulus Y. It is stretched by an amount x. The work done is
The force of cohesion is
maximum in solids
maximum in liquids
maximum in gases
same in solid, liquid and gas
The manifestation of band structure in solids is due to
Heisenberg's uncertainly principle
Pauli's exclusion principle
Bob's correspondence principle
Boltzmann's law
When a force F is applied on a wire oflength L and radius r, extension produce is l. If same force F is applied on the same material wire of length 2 L and radius 2r, then extension will be
l
2l
l/2
4l
Copper has face centred cubic (fcc) lattice with interatomic spacing equals to 2.54 . The value of lattice constant for this lattice is
3.59
2.54
1.27
5.08
A copper wire and a steel wire of the same diameter and length are connected end to end and a force is applied which stretches their combined length by 1 cm. Then the two wires will have
the same stress and strain
the same stress but different strain
the same strain but different stress
different stress and strain
A solid sphere of radius r made of a material of bulk modulus K is surrounded by a liquid in cyliridrical container. The massless piston of area A floats on the surface of the liquid. If a mass m is placed on a piston to compress the liquid, then the fractional change in the radius of the sphere will be