- ATwo diodes
- BThree diodes
- CFour diodes
- DFive diodes
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If a rod has resistance 4 W and if rod is turned as half cycle then the resistance along diameter
|
(a) 1.56 W |
(b) 2.44 W |
(c) 4 W |
(d) 2 W |
The ratio of thermionic currents (I/I0) for a metal when the temperature is slowly increased
to T as shown in figure. (I and I0 are currents at T and respectively). Then which one is correct?

| (a) A | (b) B | (c) C | (d) D |

A simple microscope has:
A radioactive substance emits
|
(a) a-rays |
(b) b-rays |
(c) g-rays |
(d) All of these |
A current carrying loop is free to turn in a uniform magnetic field. The loop will then come into equilibrium when its plane is inclined at
|
(a) 0° to the direction of the field |
(b) 45 ° to the direction of the field |
|
(c) 90° to the direction of the field |
(d) 135° to the direction of the field |
X-rays are produced by accelerating electrons by voltage V and let they strike a metal of atomic number Z. The highest frequency of X-rays produced is proportional to
|
(a) V |
(b) Z |
(c) (Z – 1) |
(d) |