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Two wires A and B of same material and same mass have radius 2rand r. If resistance of wire A is 34 Ω, then resistance of B will be
|
(a) 544 Ω |
(b) 272 Ω |
(c) 68 Ω |
(d) 17 Ω |
Angle of dip is 90o at
|
(a) Poles |
(b) Equator |
(c) Both (a) and (b) |
(d) None of these |
The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature
|
(a) Decreases exponentially with increasing band gap |
|
(b) Increases exponentially with increasing band gap |
|
(c) Decreases with increasing temperature |
|
(d) Is independent of the temperature and the band gap |
While a collector to emitter voltage is constant in a transistor, the collector current changes by 8.2 mA when the emitter current changes by 8.3 mA. The value of forward current ratio hfe is
|
(a) 82 |
(b) 83 |
(c) 8.2 |
(d) 8.3 |
The dimension of the magnetic field intensity B is
|
(a) |
(b) |
(c) |
(d) |
Which of the following is used as a moderator in nuclear reactors
|
(a) Uranium |
(b) Heavy water |
(c) Cadmium |
(d) Plutonium |
A plane convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
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(a) 50 cm |
(b) 100 cm |
(c) 200 cm |
(d) 400 cm |
Light of frequency n is incident on a certain photoelectric substance with threshold frequency n0. The work function for the substance is
|
(a) hn |
(b) hn0 |
(c) |
(d) |
A nucleus of mass 218 amu in free state decays to emit an a-particle. Kinetic energy of the a-particle emitted is 6.7 MeV. The recoil energy (in MeV) of the daughter nucleus is
|
(a) 1.0 |
(b) 0.5 |
(c) 0.25 |
(d) 0.125 |