A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will […]
A 220 volts input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformers is 80%, the current drawn by the primary […]
A cricket ball of mass 250 g collides with a bat with velocity 10 m/s and returns with same velocity within 0.01 seconds. The force acted on bat is
Options
(a) 25 N […]
The potential energy of a 1 kg particle free to move along the x-axis is given by V(x)={x⁴/4-x²/2}J. The total mechanical energy of the particle 2 J. Then, the maximum speed (in m/s) is
A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2 m and 3 m respectively from the source. The ratio of the […]
If fundamental frequency of closed pipe is 50 Hz then frequency of 2nd overtone is
Options
(a) 100 Hz (b) 50 Hz (c) 250 Hz (d) 150 Hz
Correct Answer:
250 Hz
Explanation: […]
Which of the following phenomena support the wave theory of light? 1. Scattering 2. Interference 3. Diffraction 4. Velocity of light in a denser medium is less than the velocity of light in the rare […]
Two coherent monochromatic beams of intensities I and 4I respectively, are superposed. Then, the maximum and minimum intensities in the resulting pattern are
Options
(a) 5I and 3I (b) 9I and 3I (c) […]
An ideal heat engine works between temperature T₁=500 K and T₂=375 K. If the engine absorbs 600J of heat from the source then the amount of heat released to the sink is
Options
The molar specific heat at constant pressure of an ideal gas is (7/2)R. The ratio of specific heat at constant pressure to that at constant volume is
Options
(a) (9/7) (b) (7/5) (c) […]
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