Solution:
Key concept: As we know whenever the number of magnetic lines of force (magnetic flux) passing through a circuit changes, an e.m.f is produced in the circuit called induced e.m.f. The induced e.m.f persists only as long as there is a change or cutting of flux.
In this problem, magnetic flux linked with the isolated coil changes when the coil is placed in the region of a time varying magnetic field, the coil moving in a constant magnetic field or in time varying magnetic field.
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Which of the following is diamagnetism
|
(a) Aluminium |
(b) Quartz |
(c) Nickel |
(d) Bismuth |
In a working nuclear reactor, Cadmium rods, (control rods) are used to
|
(a) Speed up neutrons |
(b) Slow down neutrons |
|
(c) Absorb some neutrons |
(d) Absorb all neutrons |
If three capacitors each of capacity 1μF are connected in such a way that the resultant capacity is 1.5 μF, then
|
(a) All the three are connected in series |
|
(b) All the three are connected in parallel |
|
(b) All the three are connected in parallel |
|
(d) Two of them are in series and then connected in parallel to the third |
Three α - particles and one β - particle decaying takes place in series from an isotope 
. Finally the isotope obtained will be
|
(a) |
(b) |
(c) |
(d) |
Assertion : The ion cannot move with a speed beyond a certain limit in a cyclotron.
Reason : As velocity increases time taken by ion increases.
|
(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. |
The velocity factor of a transmission line x. If dielectric constant of the medium is 2.6, the value of x is
|
(a) 0.26 |
(b) 0.62 |
(c) 2.6 |
(d) 6.2 |
