In the middle of the depletion layer of a reverse-biased P-N junction, the
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(a) Potential is zero (b) Electric field is zero (c) Potential is maximum (d) Electric field is maximum
Correct […]
If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li⁺⁺ is
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(a) 122.4 eV […]
A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10 sec. Then the coefficient of friction is
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(a) 0.01 (b) […]
The physical quantities not having same dimensions are
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(a) Speed and (μ₀ε₀)⁻¹/₂ (b) Torque and work (c) Momentum and Planck’s constant (d) Stress and Young’s modulus
Correct Answer:
Momentum and Planck’s constant
A boy playing on the roof of a 10m high building throws a ball with a speed of 10 m/s at an angle of 30⁰ with the horizontal. How far from the throwing point will […]
A 220 volt and 1000 watt bulb is connected across a 110 volt mains supply. The power consumed will be
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(a) 1000 W (b) 750 W (c) 500 W (d) 250 W
Correct […]
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 […]
A spring of spring constant 5 x 10³ N/m is stretched initially by 5 cm from the unstretched position. The work required to stretch it further by another 5 cm is
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(a) […]
Azospirillum is a
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(a) Nitrogen fixing vibroid bacterium (b) Gram +ve N fixing bacterium (c) Actinomycetous form which can fix nitrogen (d) Stringent anaerobe which fixes N
Correct Answer:
Nitrogen fixing vibroid […]
The displacement of a particle varies according to the relation x=4 (cos π t + sin π t). The amplitude of the particle is
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(a) 8 (b) -4 (c) 4 (d) 4 […]
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