If the lattice parameter for a crystalline structure is 3.6 Å, then the atomic radius in fcc crystal is
Options
(a) 2.92 Å (b) 1.27 Å (c) 1.81 Å (d) 2.1 Å
Correct […]
Reactance of a capacitor of capacitance C µF for A.C freqency (400 / π) Hz is 25 ohm. The value of C is
Options
(a) 25 µF (b) 100 µF (c) 75 µF […]
A ball is dropped from a height of 20 cm. Ball rebounds to a height of 10cm. What is the loss of energy?
Options
(a) 25% (b) 75% (c) 50% (d) 100%
Correct […]
A radiotransmitter radiates 1 kW power at a wavelength 198.6 m. How many photons does it emit per second
Options
(a) 10¹⁰ (b) 10²⁰ (c) 10³⁰ (d) 10⁴⁰
Correct Answer:
10³⁰
Explanation:
No […]
The temperature of ideal gas is reduced from 927° C to 27° C. The r.m.s velocity of the molecules becomes
Options
(a) double the initial value (b) half the initial value (c) four […]
The resistance of a wire is 5 ohm at 50° C and 6 ohm at 100° C. The resistance of the wire at 0° C will be
Options
(a) 3 ohm (b) 2 […]
The flux linked with a coil at any intant t is given by ?=10t² – 50t + 250. The induced emf at t=3 sec is
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(a) 190 V (b) -190 V (c) […]
A cricketer catches a ball of mass 150 g in 0.1 sec moving with speed 20 m/s. Then he experiences force of
Options
(a) 30 N (b) 3 N (c) 0.3 N (d) […]
The fluctuation in the input voltage of 200 V to a domestic circuit is +10 V. The power fluctuation will be
Options
(a) 5% (b) 10% (c) 20% (d) 40%
Correct Answer:
10%
An A.C source is rated at 220 V, 50 Hz. The time taken for voltage to change from its peak value to zero is
Options
(a) 50 sec (b) 0.02 sec (c) 5 […]
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