Which two of the following five physical parameters have the same dimensions? 1. energy density 2. refractive index 3. dielectric constant 4. Young’s modulus 5. magnetic field
Options
(a) 1 and 4 (b) […]
The unit of surface tension is
Options
(a) N/cm (b) N/cm² (c) N/cm³ (d) None of these
Correct Answer:
N/cm
Explanation:
No explanation available. Be the first to write the explanation for this […]
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) […]
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 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) 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 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 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
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, then the increase in the internal energy ∆U is
Options
(a) ∆W+∆Q (b) ∆W-∆Q (c) ∆Q-∆W (d) […]
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