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An electron is travelling in east direction and a magnetic field is applied in upward direction then electron will deflect in
|
(a) South |
(b) North |
(c) West |
(d) East |
A magnet is placed in iron powder and then taken out, then maximum iron powder is at
|
(a) Some away from north pole |
(b) Some away from south pole |
|
(c) The middle of the magnet |
(d) The end of the magnet |
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 |
|
(b) 5 Ω when the resistance of wire A is 4.25 Ω |
|
(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 |
A spherical drop of capacitance 1 mF is broken into eight drops of equal radius. Then, the capacitance of each small drop is ......
|
(a) |
(b) 8μF |
(c) |
(d) |
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 |
