Which of the adjoining graphs represents ohmic resistance
|
(a)
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(b)
|
(c)
|
(d)
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Which of the adjoining graphs represents ohmic resistance
|
(a)
|
(b)
|
(c)
|
(d)
|
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When light rays are incident on a prism at an angle of 45°, the minimum deviation is obtained. If refractive index of the material of prism is , then the angle of prism will be
|
(a) 30° |
(b) 40° |
(c) 50° |
(d) 60° |
A parallel plate capacitor has a capacity C. The separation between the plates is doubled and a dielectric medium is introduced between the plates. If the capacity now becomes 2C, the dielectric constant of the medium is
|
(a) 2 |
(b) 1 |
(c) 4 |
(d) 8 |
An oscillator circuit consists of an inductance of 0.5mH and a capacitor of 20 μF. The resonant frequency of the circuit is nearly
|
(a) 15.92 Hz |
(b) 159.2 Hz |
(c) 1592 Hz |
(d) 15910 Hz |
In an experiment, a graph was plotted of the potential difference V between the terminals of a cell against the circuit current i by varying load rheostat. Internal conductance of the cell is given by
|
(a) xy |
(b) |
(c) |
(d) (x – y) |
Three charges 4q, Q and q are in a straight line in the position of 0, l/2 and l respectively. The resultant force on q will be zero, if Q =
|
(a) – q |
(b) -2q |
(c) |
(d) 4q |
X-rays are not used for radar purpose because
| (a) They are not reflected by the target |
| (b) They are not electromagnetic waves |
| (c) They are completely absorbed by the air |
| (d) They sometimes damage the target |