The most commonly used material for making transistor is
|
(a) Copper |
(b) Silicon |
(c) Ebonite |
(d) Silver |
The most commonly used material for making transistor is
|
(a) Copper |
(b) Silicon |
(c) Ebonite |
(d) Silver |
(b) Silicon
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A lens of focal power 0.5 D is
|
(a) A convex lens of focal length 0.5 m |
|
(b) A concave lens of focal length 0.5 m |
|
(c) A convex lens of focal length 2 m |
|
(d) A concave lens of focal length 2 m |
According to de-Broglie, the de-Broglie wavelength for electron in an orbit of hydrogen atom is 10–9 m. The principle quantum number for this electron is
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
A potentiometer is an ideal device of measuring potential difference because
|
(a) It uses a sensitive galvanometer |
|
(b) It does not disturb the potential difference it measures |
|
(c) It is an elaborate arrangement |
|
(d) It has a long wire hence heat developed is quickly radiated |
Six equal resistances are connected between points P, Q and R as shown in the figure. Then the net resistance will be maximum between
|
(a) P and Q |
(b) Q and R |
(c) P and R |
(d) Any two points |
X-rays are produced in X-ray tube operating at a given accelerating voltage. The wavelength of the continuous X-rays has values from
| (a) 0 to ∞ |
|
(b) |
|
(c) 0 to |
|
(d) |

In order to increase the sensitivity of a moving coil galvanometer, one should decrease
|
(a) The strength of its magnet |
(b) The torsional constant of its suspension |
|
(c) The number of turns in its coil |
(d) The area of its coil |
A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed
away, the number of electrons emitted by photo cathode would
|
(a) Decrease by a factor of 2 |
(b) Increase by a factor of 2 |
|
(c) Decrease by a factor of 4 |
(d) Increase by a factor of 4 |