In a PN-junction diode not connected to any circuit
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(a) The potential is the same everywhere |
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(b) The P-type is a higher potential than the N-type side |
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(c) There is an electric field at the junction directed from the N- type side to the P- type side |
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(d) There is an electric field at the junction directed from the P-type side to the N-type side |
(c) There is an electric field at the junction directed from the N- type side to the P- type side
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A person can see clearly only upto a distance of 25 cm. He wants to read a book placed at a distance of 50 cm. What kind of lens does he require for his spectacles and what must be its power
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(a) Concave, – 1.0 D |
(b) Convex, + 1.5 D |
(c) Concave, – 2.0 D |
(d) Convex, + 2.0 D |
The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm. The ground state energy of an electron of this ion will be
|
(a) 3.4 eV |
(b) 13.6 eV |
(c) 54.4 eV |
(d) 122.4 eV |
Which of the following (referred to a spherical mirror) do (does) not depend on whether the rays are paraxial or not?
The sun revolves around the galaxy with a speed of 250 km/sec and it's radius is 3 × 104 light year. The mass of the milky way is
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(a) 3 × 1040 kg |
(b) 3 × 1041 kg |
(c) 5 × 1040 kg |
(d) 6 × 1041 kg |
The time period of a bar magnet suspended horizontally in the earth's magnetic field and allowed to oscillate
| (a) Is directly proportional to the square root of its mass |
| (b) Is directly proportional to its pole strength |
| (c) Is inversely proportional to its magnetic moment |
| (d) Decreases if the length increases but pole strength remains same |
A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black, the image will
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(a) Be shifted downwards |
(b) Be shifted upwards |
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(c) Not be shifted |
(d) Shift on the principal axis |