MCQ
Name the unit of electrical potential:
- ACoulomb
- BWatt
- CJoule
- DVolt
Explanation:
Electrical potential is a type of potential energy, and refers to the energy that could be released if electric current is allowed to flow.
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On heating a liquid, the refractive index generally
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(a) Decreases |
|
(b) Increases or decreases depending on the rate of heating |
|
(c) Does not change |
|
(d) Increases |
The minimum distance between an object and its real image formed by a convex lens is
|
(a) 1.5 f |
(b) 2 f |
(c) 2.5 f |
(d) 4 f |
In a diode valve the cathode temperature must be (f = work function)
|
(a) High and ∅ should be high |
(b) High and ∅ should be low |
|
(c) Low and ∅ should be high |
(d) Low and ∅ should be high |
The deflection in a moving coil galvanometer is
|
(a) Directly proportional to the torsional constant |
|
(b) Directly proportional to the number of turns in the coil |
|
(c) Inversely proportional to the area of the coil |
|
(d) Inversely proportional to the current flowing |
In which of the following the final image is erect?
A transistor is used as an amplifier in CB mode with a load resistance of 5 k W the current gain of amplifier is 0.98 and the input resistance is 70 W, the voltage gain and power gain respectively are
|
(a) 70, 68.6 |
(b) 80, 75.6 |
(c) 60, 66.6 |
(d) 90, 96.6 |