MCQ
1 Volt = _____________ style-type: lower- alpha;”>
- A1 Coulomb
- B1 Newton/ 1 Coulomb
- C1 Joule/ 1 Coulomb
- D1 Newton/ 1 meter
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The relaxation time in conductors
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(a) Increases with the increase of temperature |
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(b) Decreases with the increase of temperature |
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(c) It does not depend on temperature |
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(d) All of sudden changes at 400 K |
$\text{y}=\text{a}_1\sin\omega\text{t}$
$\text{y}=\text{a}_2\sin(\omega\text{t}+\in)$
$\text{y}=\text{a}_1\sin2\omega\text{t}$
$\text{y}=\text{a}_2\sin2(\omega\text{t}+\in)$
A motor having an armature of resistance 2Ω is designed to operate at 220 V mains. At full speed, it develops a back e.m.f. of 210V. When the motor is running at full speed, the current in the armature is
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(a) 5A |
(b) 105A |
(c) 110A |
(d) 215A |
The current sensitivity of a moving coil galvanometer can be increased by
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(a) Increasing the magnetic field of the permanent magnet |
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(b) Increasing the area of the deflecting coil |
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(c) Increasing the number of turns in the coil |
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(d) a, b, c |
In a PN junction photo cell, the value of photo-electromotive force produced by monochromatic light is proportional to
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(a) The voltage applied at the PN junction |
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(b) The barrier voltage at the PN junction |
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(c) The intensity of the light falling on the cell |
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(d) The frequency of the light falling on the cell |
In P-N junction, the barrier potential offers resistance to
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(a) Free electrons in N region and holes in P region |
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(b) Free electrons in P region and holes in N region |
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(c) Only free electrons in N region |
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(d) Only holes in P region |