The potential energy of a long spring when stretched by 2 cm is U.
The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is
Options
(a) U/4 (b) […]
Physics
A stationary particle explodes into two particles of masses m₁ and m₂ which move
A stationary particle explodes into two particles of masses m₁ and m₂ which move in opposite directions with velocities v₁ and v₂. The ratio of their kinetic energy is
Options
(a) m₂/m₁ (b) […]
A uniform rope of length 12 m and mass 6 kg hangs vertically from a rigid support.
A uniform rope of length 12 m and mass 6 kg hangs vertically from a rigid support. A block of masses 2 kg is attached to the free end of the rope. A transverst pulse […]
The time of reverberation of a room A is one second. What will be the time (in seconds)
The time of reverberation of a room A is one second. What will be the time (in seconds) of reverbation of a room, having all the dimensions double of those of room A?
Options […]
A plane polarised light is incident normally on a tourmaline plate. Its E vector make
A plane polarised light is incident normally on a tourmaline plate. Its E vector make an angle of 60⁰ with the optic axis of the plate. Find the percentage difference between initial and final intensities […]
The interferance pattern is obtained with two coherent light sources of intensity
The interferance pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio Imax-Imin/ Imax+Imin will be
Options
(a) √n/n+1 (b) 2√n/n+1 (c) √n/(n+1)² (d) 2√n/(n+1)²
If sink is at a temperature of -39⁰C and source at 0⁰C, then efficiency will be
If sink is at a temperature of -39⁰C and source at 0⁰C, then efficiency will be
Options
(a) 14.20% (b) 20.20% (c) 35.20% (d) 45.50%
Correct Answer:
14.20%
Explanation:
No explanation available. Be […]
If ∆Q>0 when heat flows into a system, ∆W>0 when work is done on the system
If ∆Q>0 when heat flows into a system, ∆W>0 when work is done on the system, then the increase in the internal energy ∆U is
Options
(a) ∆W+∆Q (b) ∆W-∆Q (c) ∆Q-∆W (d) […]
A glass slab consists of thin uniform layers of progressively decreasing refractive
A glass slab consists of thin uniform layers of progressively decreasing refractive indices refractive index such that the refractive index of any layer is μ-m∆μ. Here μ and ∆μ denote the refractive index of 0th […]
If μᵥ=1.5230 and μʀ=15.145, then dispersive power of crown glass is
If μᵥ=1.5230 and μʀ=15.145, then dispersive power of crown glass is
Options
(a) 0.0164 (b) 0.00701 (c) 0.0132 (d) 0.032
Correct Answer:
0.0164
Explanation:
Here μᵥ=1.5230and μʀ=1.5145
Therefore, mean refractive index, μ =(1.523+1.5145) /2 […]