CBSE
Multiple Choice QuestionsThe maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young's double slit experiment is
infinite
five
three
zero
Two bars A and B of circular cross-section and same volume made of same material are subjected under same tension. If the diameter of A is half that of B. The ratio of extension of A to B will be
16
2
4
The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is
13.2 cm
8 cm
16 cm
12.5 cm
If Young's double slit experiment is performed i water instead of air, then
no fringes would be seen
fringe width would decrease
fringe width would increase
fringe width would remain unchanged
A cube of side 40 mm has its upper face displaced by 0.1 mm by a tangential force of 8 kN. The shearing modulus of cube is
2 × 109 Nm-2
4 × 109 Nm-2
8 × 109 Nm-2
16 × 109 Nm-2
A ball falling in a lake depth 200 m shows a decrease of 0.1 % in its volume at the bottom then the bulk modulus of the material of the ball is
A wire can be broken by applying load of 200 N. The force required to break another wire of the same length and same material, but double in diameter is
200 N
400 N
600 N
800 N
The dimensional formula for Young's modulus is
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
l
Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by Δl on applying a force F, how much force is needed to stretch the second wire by the same amount?
9F
6F
F
4F
