A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equillibrium state. The energy required to rotate it by 60⁰ is W. Now the torque required […]
A plumb line is suspended form a ceiling of a car moving with horizontal acceleration of ɑ. What will be the angle of inclination with vertical?
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(a) tan¯¹ (ɑ/g) (b) tan¯¹(g/ɑ) (c) […]
A body of mass 1.0 kg is falling with an acceleration of 10 ms⁻². Its apparent weight will be (g=10 ms⁻²)
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(a) 1.0 kg wt (b) 2.0 kg wt (c) zero (d) […]
The earth is assumed to be a sphere of radius R. A platform is arranged at a height R from the surface of the earth. The escape velocity of a body from this platform is […]
If the earth shrink such that its mass does not change but radius decreases to one quarter of its original value then one complete day will take
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(a) 96 hours (b) 48 […]
A electric dipole is placed at an angle of 30⁰ to a non-uniform electric field. The dipole will experience
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(a) a torque only (b) a translational force only in the direction of […]
A capacitor is charged to 200 volt. It has a charge of 0.1 coulomb. When it is discharged, energy liberated will be
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(a) 1 J (b) 4 J (c) 10 J (d) 20 […]
A Zenor diode has a contact potential of 1 V in the absence of biasing. It undergoes Zenor breakdown for an electric field of 10⁶ V/m at the depletion region of p-n junction. If the […]
A n-p-n transistor is connected in common emitter configuration in a given amplifier. A load resistance of 800Ω is connected in the collector circuit and the voltage drop across it is 0.8 V. If the […]
A short circuited coil is placed in a magnetic field varying with time. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be quadrupled and […]
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