At what distance from the centre of earth, the value of acceleration due to gravity will be half that on the surface (R=radius of earth)
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(a) 2 R (b) R (c) 1.414 […]
A rocket with a lift-off mass 3.5 x 10⁴ kg is blasted upwards with an initial acceleration of 10 m/s². The initial thrust of the blast is
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(a) 1.75 x 10⁵ N […]
In an LCR series A.C circuit, the voltage across each of the components, L, C and R is 50V. The voltage across the L.C combination will be
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(a) 50 V (b) 50 […]
The radius of gyration of a solid sphere of radius r about a certain axis is r. The distance of this axis from the centre of the sphere is
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(a) r (b) […]
The de-Broglie wavelength of a proton(charge = 1.6 x 10⁻¹⁹ C, Mass = 1.6 x 10⁻²⁷ kg) accelerated through a potential difference of 1 kV is
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(a) 600 Å (b) 0.9 x […]
The escape velocity from the earth is Ve. The escape velocity from a planet whose radius is 4 times and density is 9 times that of earth is
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(a) 36 Ve (b) […]
A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and of a 2 volt battery. The time constant of the circuit is
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(a) 5 sec […]
If a star converts all helium in its core to oxygen, then energy released per oxygen nuclei is(Mass of He=4.0026 amu, Mass of O=15.99994 amu)
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(a) 10.24 Mev (b) 0 (c) 7.56 […]
A carnot’s engine operates with source at 127° C and sink at 27° C. If the source supplies 40 kJ of heat energy, the work done by the engine is
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(a) 30 […]
A man measures time period of a pendulum(T) in stationary lift. If the lift moves upwards with acceleration g/4, then the new time period will be
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(a) 2T / √5 (b) √5T […]
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