Explanation:
The magnetic susceptibility of diamagnetic materials doesn’t depend upon temperature. This is often because there’s an outsized barrier between the bottom state and therefore the excited states of diamagnetic substances. Hence, it remains constant during the change of temperature. All the other statements are false.
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A copper wire of resistance R is cut into ten parts of equal length. Two pieces each are joined in series and then five such combinations are joined in parallel. The new combination will have a resistance
|
(a) R |
(b) |
(c) |
(d) |
Resistivity of a semiconductor depends on
|
(a) Shape of semiconductor |
|
(b) Atomic nature of semiconductor |
|
(c) Length of semiconductor |
|
(d) Shape and atomic nature of semiconductor |
Assertion : Cyclotron is a device which is used to accelerate the positive ion.
Reason : Cyclotron frequency depends upon the velocity.
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(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. |
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(d) If the assertion and reason both are false. |
If the speed of light in vacuum is C m/sec, then the velocity of light in a medium of refractive index 1.5
|
(a) Is 1.5 × C |
(b) Is C |
|
(c) Is |
(d) Can have any velocity |
A small coil of N turns has area A and a current I flows through it. The magnetic dipole moment of this coil will be
|
(a) NI/A |
(b) |
(c) |
(d) NIA |
Two uniform wires A and B are of the same metal and have equal masses. The radius of wire A is twice that of wire B. The total resistance of A and B when connected in parallel is
|
(a) 4 Ω when the resistance of wire A is 4.25 Ω |
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(b) 5 Ω when the resistance of wire A is 4.25 Ω |
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(c) 4 Ω when the resistance of wire B is 4.25 Ω |
|
(d) 4 Ω when the resistance of wire B is 4.25 Ω |
Threshold frequency for a metal is 
Hz. Light of 
falls on its surface. Which of the following statements is correct
|
(a) No photoelectric emission takes place |
|
(b) Photo-electrons come out with zero speed |
|
(c) Photo-electrons come out with 103 m/sec speed |
|
(d) Photo-electrons come out with 105 m/sec speed |
