- AFerromagnetic materials.
- BParamagnetic materials.
- CDiamagnetic materials.
- DAll of the above.
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The process by which a heavy nucleus splits into light nuclei is known as
|
(a) Fission |
(b) α- decay |
(c) Fusion |
(d) Chain reaction |
Coating of strontium oxide on Tungsten cathode in a valve is good for thermionic emission because
|
(a) Work function decreases |
|
(b) Work function increases |
|
(c) Conductivity of cathode increases |
|
(d) Cathode can be heated to high temperature |
Three wires of copper, iron and nickel are joined to form three junctions as shown in Fig. When the temperature of junction 1 is kept 50℃ with the other two junctions at 0℃, the sensitive galvanometer gives a deflection of 14 divisions. When the temperature of junction 3 is kept 50℃, with the other two junctions at 0℃, the galvanometer gives a deflection of 11 divisions. Then the deflection given by the galvanometer, when temperature of the junction 2 is kept at 50℃, with the other two junctions at 0℃, will be
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(a) 3 div |
(b) 11 div |
(c) 14 div |
(d) 25 div |
A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region

|
(a) Is zero |
(b) Decreases as |
(c) Increases as r |
(d) Decreases as |
The equivalent resistance of the circuit shown in the figure is
|
(a) 8 W |
(b) 6 W |
(c) 5 W |
(d) 4 W |
A thermoelectric refrigerator works on
|
(a) Joule effect |
(b) Seeback effect |
(c) Peltier effect |
(d) Thermonic emission |
The energy equivalent of 1 kilogram of matter is about
|
(a) |
(b) 1 J |
(c) |
(d) |