The radius of gyration of a solid sphere of radius r about a certain axis is r
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) […]
Physics
The de-Broglie wavelength of a proton(charge = 1.6 x 10⁻¹⁹ C, Mass = 1.6 x 10⁻²⁷ kg)
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
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
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
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
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
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 […]
A capacitor of 10 µF charged upto 250 volt is connected in parallel with another
A capacitor of 10 µF charged upto 250 volt is connected in parallel with another capacitor of 5 µF charged upto 100 volt. The common potential is
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(a) 500 V (b) 400 […]
The 6563 Å line emitted by hydrogen atom in a star is found to be red shifted by 5Å
The 6563 Å line emitted by hydrogen atom in a star is found to be red shifted by 5 Å. The speed with which the star is receding from the earth is
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A beaker of radius 1.5 cm is filled with a liquid of surface tension 0.075 N/m
A beaker of radius 1.5 cm is filled with a liquid of surface tension 0.075 N/m. Force across an imaginary diameter on the surface of the liquid is
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(a) 0.75 N (b) […]