Explanation:
As the air inside the jar is pumped out, the air pressure decreases. Thus, the pressure in the liquid near the bottom of the beaker decreases.
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A pellet carrying charge of 0.5 coulombs is accelerated through a potential of 2,000 volts. It attains a kinetic energy equal to
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(a) 1000 ergs |
(b) 1000 joules |
(c) 1000 kWh |
(d) 500 ergs |
An electric dipole is placed in an electric field generated by a point charge
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(a) The net electric force on the dipole must be zero |
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(b) The net electric force on the dipole may be zero |
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(c) The torque on the dipole due to the field must be zero |
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(d) The torque on the dipole due to the field may be zero |
A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is 
seconds. One of the magnets is removed and if the other magnet oscillates in the same field, then the time period in seconds is
(a) 
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(b)
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(c) 2 |
(d) 
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Consider the following statements A and B and identify the correct choice of the given answers
A : The width of the depletion layer in a P-N junction diode increases in forwards bias
B : In an intrinsic semiconductor the fermi energy level is exactly in the middle of the forbidden gap
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(a) A is true and B is false |
(b) Both A and B are false |
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(c) A is false and B is true |
(d) Both A and B are true |
Polarised glass is used in sun glasses because
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(a) It reduces the light intensity to half an account of polarisation |
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(b) It is fashionable |
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(c) It has good colour |
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(d) It is cheaper |