physics set 13

Q.1 A wire is stretched by a force which causes an extension. The energy is stored in it only when:
A) Extension of wire is proportional to force applied C) The wire is not stretched beyond its elastic limit
B) The cross-section area of the wire remains constant D) The weight of wire is negligible
Q.2 Which statement is correct:
A) Elasticity is that property of body which enables body to regain its original dimension
B) Elasticity is that property of a body that does not allow it to return to its original shape
C) Elasticity is that property of a body that allows it to retain its original shape and dimension after the stress
is removed.
D) Elasticity is that property of a body that obeys Hooke’s law.

Q.3 The ratio of tensile strength to tensile strain is called
A) Modulus of elasticity              C) Young’s Modulus
B) Bulk Modulus                        D) Shear Modulus
Q.4 A wire is stretched by a force ‘F’ which causes an extension ∆l, the energy stored in the wire is:
A) F∆l                           C) ½ F∆l2
B) 2F∆l                         D) ½ F∆l

Q.5 The stress­strain graph, deduced the following limits successively:
A) Proportional limit, yield limit, elastic limit C) Proportional limit, elastic limit, yield limit
B) Yield limit, elastic limit, proportional limit D) Elastic limit, proportional limit, yield limit