An object is immersed in a fluid. In order that the object becomes invisible, it should
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(a) Behave as a perfect reflector |
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(b) Absorb all light falling on it |
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(c) Have refractive index one |
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(d) Have refractive index exactly matching with that of the surrounding fluid |
(d) Have refractive index exactly matching with that of the surrounding fluid
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The correct curve between the stopping potential (V) and intensity of incident light (I) is
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(a)
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(b)
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(c)
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(d)
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You are given several identical resistances each of value R = 10 Ω and each capable of carrying maximum current of 1 ampere. It is required to make a suitable combination of these resistances to produce a resistance of 5 Ω which can carry a current of 4 amperes. The minimum number of resistances of the type R that will be required for this job
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(a) 4 |
(b) 10 |
(c) 8 |
(d) 20 |
Plane polarised light is passed through a polaroid. On viewing through the polaroid we find that when the polariod is given one complete rotation about the direction of the light, one of the following is observed
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(a) The intensity of light gradually decreases to zero and remains at zero |
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(b) The intensity of light gradually increases to a maximum and remains at maximum |
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(c) There is no change in intensity |
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(d) The intensity of light is twice maximum and twice zero |
What is the stopping potential when the metal with work function 0.6 eV is illuminated with the light of 2 eV
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(a) 2.6 V |
(b) 3.6 V |
(c) 0.8 V |
(d) 1.4 V |
When 
ampere current is passed in a tangent galvanometer, there is a deflection of 30° in it. The deflection obtained when 3 amperes current is passed, is
| (a) 30° | (b) 45° | (c) 60° | (d) 75° |
The current is flowing in south direction along a power line. The direction of magnetic field above the power line (neglecting earth's field) is
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(a) South |
(b) East |
(c) North |
(d) West |
Whenever light travels from denser medium to a rarer medium:
