When a 12 Ω resistor is connected with a moving coil galvanometer then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is
|
(a) 24 Ω |
(b) 36 Ω |
(c) 48 Ω |
(d) 60 Ω |
(c) 48 Ω
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A group of bright and faint stars is called
|
(a) Galaxy |
(b) Comet |
(c) Black hole |
(d) Constellation |
A steady current i is flowing through a conductor of uniform cross-section. Any segment of the conductor has
|
(a) Zero charge |
(b) Only positive charge |
|
(c) Only negative charge |
(d) Charge proportional to current i |
Two positive charges of 20 coulomb and Q coulomb are situated at a distance of 60 cm. The neutral point between them is at a distance of 20 cm from the 20 coulomb charge. Charge Q is
|
(a) 30 C |
(b) 40 C |
(c) 60 C |
(d) 80 C |
Three unequal resistors in parallel are equivalent to a resistance 1 ohm. If two of them are in the ratio 1 : 2 and if no resistance value is fractional, the largest of the three resistances in ohms is
|
(a) 4 |
(b) 6 |
(c) 8 |
(d) 12 |
The angle of minimum deviation measured with a prism is 30° and the angle of prism is 60°. The refractive index of prism material is
|
(a) |
(b) 2 |
(c) 3/2 |
(d) 4/3 |
A radioactive sample with a half life of 1 month has the label : “Activity=2 micro curies on 1.8.1991.'' What will be its activity two months later
|
(a) 1.0 micro curies |
(b) 0.5 micro curies |
(c) 4 micro curies |
(d) 8 micro curies |
