- AAre available universally.
- BCan be combined to produce OR, AND and NOT gates.
- CAre widely used in Integrated circuit packages.
- DAre easiest to manufacture.
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A current of 2 A passing through conductor produces 80 J of heat in 10 seconds. The resistance of the conductor is
|
(a) 0.5 Ω |
(b) 2 Ω |
(c) 4 Ω |
(d) 20 Ω |
The effective resistance of two resistors in parallel is . If one of the resistors is disconnected the resistance becomes 4 W. The resistance of the other resistor is
|
(a) 4 W |
(b) 3 W |
(c) |
(d) |
The dispersive powers of glasses of lenses used in an achromatic pair are in the ratio 5 : 3. If the focal length of the concave lens is 15 cm, then the nature and focal length of the other lens would be
|
(a) Convex, 9 cm |
(b) Concave, 9 cm |
(c) Convex, 25 cm |
(d) Concave, 25 cm |
The time period of oscillation of a freely suspended bar magnet with usual notations is given by
|
(a) T = 2π |
(b) T = 2π |
(c) T = |
(d) T = 2π |
A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point p a distance
from the centre of the shell is
|
(a) |
(b) |
(c) |
(d) |
A convex lens is used to form real image of an object on a screen. It is observed that even when the positions of the object and that screen are fixed there are two positions of the lens to form real images. If the heights of the images are 4 cm and 9 cm respectively, the height of the object is
|
(a) 2.25 cm |
(b) 6.00 cm |
(c) 6.50 cm |
(d) 36.00 cm |
The line on the earth's surface joining the points where the field is horizontal is
| (a) Magnetic meridian | (b) Magnetic axis | (c) Magnetic line | (d) Magnetic equator |
Peltier coefficient for the junction of a pair of metals is proportional to
|
(a) T absolute temperature of the junction |
|
(b) Square of absolute temperature of the junction |
|
(c) |
|
(d) |