PN-junction diode works as a insulator, if connected
| (a) To A.C. | (b) In forward bias | (c) In reverse bias | (d) None of these |
PN-junction diode works as a insulator, if connected
| (a) To A.C. | (b) In forward bias | (c) In reverse bias | (d) None of these |
(c) In reverse bias
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The number of dry cells, each of e.m.f. 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit is
|
(a) 2 |
(b) 8 |
(c) 10 |
(d) 12 |
Two thick wires and two thin wires, all of the same materials and same length form a square in the three different ways P, Q and R as shown in fig with current connection shown, the magnetic field at the centre of the square is zero in cases
|
(a) In P only |
(b) In P and Q only |
(c) In Q and R only |
(d) P and R only |
The maximum magnification that can be obtained with a convex lens of focal length 2.5 cm is (the least distance of distinct vision is 25 cm)
|
(a) 10 |
(b) 0.1 |
(c) 62.5 |
(d) 11 |
If there are n capacitors in parallel connected to V volt source, then the energy stored is equal to
|
(a) CV |
(b) |
(c) |
(d) |
The resistance of a galvanometer coil is R. What is the shunt resistance required to convert it into an ammeter of range 4 times
|
(a) |
(b) |
(c) |
(d) 4 R |
Assertion : Diamond glitters brilliantly.
Reason : Diamond does not absorb sunlight.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
In any Bohr orbit of the hydrogen atom, the ratio of kinetic energy to potential energy of the electron is
|
(a) 1/2 |
(b) 2 |
(c) -1/2 |
(d) -2 |
Two identical coaxial circular loops carry current i each circulating in the clockwise direction. If the loops are approaching each other, then
|
(a) Current in each loop increases |
|
(b) Current in each loop remains the same |
|
(c) Current in each loop decreases |
|
(d) Current in one-loop increases and in the other it decreases |