The angular position of cells remains the same for a sample of a crystal. This property is called___________________?
(A) Isotropy
(B) Cleavage
(C) Homogeneity
(D) The external symmetry of form
Materials in which valence electrons are tightly bound to their atoms at low temperature are called___________________?
(A) Semi conductor
(B) Super conductors
(C) Insulators
(D) Conductor
The energy band occupied by the valence electrons is called___________________?
(A) Energy state
(B) Valence band
(C) ve energy state
(D) conduction band
Formation of large molecule by joining small molecules is_________________?
(A) Fusion
(B) Polymerization
(C) Crystallization
(D) Subtraction
A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________?
(A) The extension of the wire is proportional to the force applied
(B) The weight of the wire is negligible
(C) The wire is not stretched beyond its elastic limit
(D) The cross sectional area of the wire remains constant
The ration stress to strain in youngs modulus of the material then tension is__________________?
(A) Directly proportional to extension
(B) Directly proportional to strain
(C) Directly proportional to square of amplitude
(D) Inversely proportional to extension
A certain stress applied to an elastic material produces a certain strain in it. If the elastic limit is not exceeded the energy gained per unit volume of the material is given by_________________?
(A) Stress/strain
(B) (stress/strain)
(C) Stress x strain
(D) (Stress / strain)
A wire suspended vertically from one end is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. How much energy is gained by the wire ?
(A) 0.01J
(B) 0.02J
(C) 0.04J
(D) 1.0J
A uniform steel wire of length 4m and area of cross-section 3×10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2×1011 Nm-2 the energy stored in the wire is___________________?
(A) 0.025J
(B) 0.50J
(C) 0.75J
(D) 0.100J
A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber ?
(A) 2×108 Nm-2
(B) 5×106 Nm-2
(C) 0.5×10-6 Nm-2
(D) 0.2×10-6Nm-2