In a PN-junction diode not connected to any circuit
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(a) The potential is the same everywhere |
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(b) The P-type is a higher potential than the N-type side |
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(c) There is an electric field at the junction directed from the N- type side to the P- type side |
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(d) There is an electric field at the junction directed from the P-type side to the N-type side |
(c) There is an electric field at the junction directed from the N- type side to the P- type side
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The ratio of intensities of two waves are given by 4 : 1. The ratio of the amplitudes of the two waves is
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(a) 2 : 1 |
(b) 1 : 2 |
(c) 4 : 1 |
(d) 1 : 4 |
Assertion : Silicon is preferred over germanium for making semiconductor devices.
Reason : The energy gap for germanium is more than the energy gap of silicon.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
Assertion : A loosely round helix made of stiff wire is suspended vertically with the lower end just touching a dish of mercury. When a current is passed through the wire, the helical wire executes oscillatory motion with the lower end jumping out of and inside of mercury.
Reason : When electric current is passed through helix, a magnetic field is produced both inside and outside the helix.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
If the length of potentiometer wire is increased, then the length of the previously obtained balance point will
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(a) Increase |
(b) Decrease |
(c) Remain unchanged |
(d) Become two times |
Given below are symbols for some logic gates
The XOR gate and NOR gate respectively are
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(a) 1 and 2 |
(b) 2 and 3 |
(c) 3 and 4 |
(d) 1 and 4 |