A satellite is revolving around the earth with a kinetic energy E. The minimum addition of kinetic energy needed to make it escape from its orbit is
Options
(a) 2E (b) 2/E (c) […]
Imagine a new planet having the same density as that of earth but it is 3 times bigger than the earth in size. If the acceleration due to gravity on the surface of earth is […]
A gaussian sphere encloses an electric dipole within it. The total flux across the sphere is
Options
(a) zero (b) half that due to a single charge (c) double that due to a […]
A capacitor is used to store 24 watt hour of energy at 1200 volt. What should be the capacitance of the capacitor?
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(a) 120 mF (b) 120 μF (c) 24 μF (d) […]
The necessary condition in making of a junction transistor (E- emitter, B- base and C- collector)
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(a) E and B are lightly doped and C is heavily doped (b) E is heavily […]
An amplifier has a voltage gain Av=1000. The voltage gain in dB is
Options
(a) 30 dB (b) 60 dB (c) 3 dB (d) 20 dB
Correct Answer:
60 dB
Explanation:
No explanation […]
Electromagnetic induction is not used in
Options
(a) speedometer (b) transformer (c) AC generator (d) room heater
Correct Answer:
room heater
Explanation:
No explanation available. Be the first to write the explanation for […]
A solenoid of length l metre has self inductance L henry. If number of turns are doubled, its self inductance
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(a) Becomes 2 L henry (b) Becomes 4 L henry (c) Remains […]
A light of wavelength 5000Å falls on a sensitive plate with photoelectric work function 1.90 eV. Kinetic energy of the emitted photoelectrons will be (given, h=6.62×10⁻³⁴ Js)
Options
(a) 0.1 eV (b) 2 […]
Bragg’s law for X-rays is
Options
(a) d sin θ = 2nλ (b) 2d sin θ = nλ (c) n sin θ = 2λd (d) None of these
Correct Answer:
2d sin θ […]
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