Before using the tangent galvanometer, its coil is set in
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(a) Magnetic meridian (or vertically north south) |
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(b) Perpendicular to magnetic meridian |
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(c) At angle of 45o to magnetic meridian |
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(d) It does not require any setting |
(a) Magnetic meridian (or vertically north south)
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A NPN transistor conducts when
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(a) Both collector and emitter are positive with respect to the base |
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(b) Collector is positive and emitter is negative with respect to the base |
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(c) Collector is positive and emitter is at same potential as the base |
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(d) Both collector and emitter are negative with respect to the base |
A person using a lens as a simple microscope sees an:
The direction of line of magnetic field of bar magnet is
|
(a) From south pole to north pole |
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(b) From north pole to south pole |
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(c) Across the bar magnet |
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(d) From south pole to north pole inside the magnet and from north pole to south pole outside the magnet |
A thick wire is stretched so that its length become two times. Assuming that there is no change in its density, then what is the ratio of change in resistance of wire to the initial resistance of wire
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(a) 2 : 1 |
(b) 4 : 1 |
(c) 3 : 1 |
(d) 1 : 4 |