In Young’s double slit experiment, a minimum is obtained when the phase difference of super imposing waves is
|
(a) Zero |
(b) (2n – 1)π |
(c) nπ |
(d) (n + 1) π |
(b) (2n – 1)π
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The ratio of the magnetic field at the centre of a current carrying coil of the radius a and at a distance ‘a’ from centre of the coil and perpendicular to the axis of coil is
|
(a) |
(b) |
(c) |
(d) 2 |
Consider an NPN transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current
|
(a) 1.1 mA |
(b) 1.01 mA |
(c) 0.01 mA |
(d) 10 mA |
Energy of photon whose frequency is 
, will be
|
(a) 4.14 |
(b) 4.14 |
(c) 4.14 |
(d) 4.14 |
Penetrating power of X-rays depends on
|
(a) Current flowing in the filament |
(b) Applied potential difference |
|
(c) Nature of the target |
(d) All the above |
Line spectrum contains information about
|
(a) The atoms of the prism |
|
(b) The atoms of the source |
|
(c) The molecules of the source |
|
(d) The atoms as well as molecules of the source |
What is the net force on the square coil
|
(a) 25 |
(b) 25 |
|
(c) 35 |
(d) 35 |
