In the given figure, when galvanometer shows no deflection, the current (in ampere) flowing through 5Ω resistance will be
|
(a) 0.5 |
(b) 0.6 |
(c) 0.9 |
(d) 1.5 |
(b) 0.6
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A piece of fuse wire melts when a current of 15 ampere flows through it. With this current, if it dissipates 22.5 W, the resistance of fuse wire will be
|
(a) Zero |
(b) 10 Ω |
(c) 1 Ω |
(d) 0.10 Ω |
The refractive index of water is 1.33. The direction in which a man under water should look to see the setting sun is
|
(a) 49o to the horizontal |
(b) 90o with the vertical |
|
(c) 49o to the vertical |
(d) Along the horizontal |
Referring to the figure below, the effective resistance of the network is
|
(a) 2 r |
(b) 4 r |
(c) 10 r |
(d) 5r/2 |
A star is moving away from the earth with a velocity of 100 km/s. If the velocity of light is 3 
then the shift of its spectral line of wavelength 5700 Å due to Doppler's effect will be
|
(a) 0.63 Å |
(b) 1.90 Å |
(c) 3.80 Å |
(d) 5.70 Å |
Two long and parallel wires are at a distance of 0.1 m and a current of 5 A is flowing in each of these wires. The force per unit length due to these wires will be
|
(a) 5 |
(b) 5 |
(c) 2.5 |
(d) 2.5 |
An average induced e.m.f. of 1V appears in a coil when the current in it is changed from 10A in one direction to 10 A in opposite direction in 0.5 sec. Self-inductance of the coil is
|
(a) 25 mH |
(b) 50 mH |
(c) 75 mH |
(d) 100 mH |
