- ANon-magnetic.
- BPara magnetic.
- CDia magnetic.
- DFerro magnetic.
Explanation:
Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetisation of a material in response to an applied magnetic field.
Substances such as copper, iron have negative susceptibility as these substances are diamagnetic substances.
Substances with negative susceptibility signifies that they are repelled by magnets.
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The emf of a thermocouple, one junction of which is kept at 0℃, is given by
the Peltier co-efficient will be
|
(a) (t + 273) (a + 2bt) |
(b) (t + 273) (a – 2bt) |
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(c) (t – 273) (a- 2bt) |
(d) (t – 273) (a – 2bt) |
When
transforms to
, then the number of the emitted a- and b-particles is, respectively
|
(a) 8α, 7β |
(b) 4α, 7β |
(c) 4 α, 4β |
(d) 4α, 1β |
In a photo cell, the photo-electrons emission takes place
|
(a) After 10–1 sec on incident of light rays |
|
(b) After 10–3 sec on incident of light rays |
|
(c) After 10–6 sec on incident of light rays |
|
(d) After 10–8 sec on incident of light rays |
In a transistor circuit shown here the base current is 35 mA. The value of the resistor Rb is
| (a) 123.5 kW | (b) 257 kW | (c) 380.05 kW | (d) None of these |
NPN transistor are preferred to PNP transistor because they have
|
(a) Low cost |
|
(b) Low dissipation energy |
|
(c) Capability of handing large power |
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(d) Electrons having high mobility than holes |
In the diagram shown if a bar magnet is moved along the common axis of two single turn coils A and B in the direction of arrow

|
(a) Current is induced only in A & not in B |
|
(b) Induced currents in A & B are in the same direction |
|
(c) Current is induced only in B and not in A |
|
(d) Induced currents in A & B are in opposite directions |