In the formation of primary rainbow, the sunlight rays emerge at minimum deviation from rain-drop after
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(a) One internal reflection and one refraction |
|
(b) One internal reflection and two refractions |
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(c) Two internal reflections and one refraction |
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(d) Two internal reflections and two refractions |
(b) One internal reflection and two refractions
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The speed of electromagnetic wave in vacuum depends upon the source of radiation
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(a) Increases as we move from g-rays to radio waves |
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(b) Decreases as we move from g-rays to radio waves |
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(c) Is same for all of them |
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(d) None of these |
In a P-type semiconductor
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(a) Current is mainly carried by holes |
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(b) Current is mainly carried by electrons |
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(c) The material is always positively charged |
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(d) Doping is done by pentavalent material |
On giving 220V to a resistor the power dissipated is 40W then value of resistance is
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(a) 1210 W |
(b) 2000 W |
(c) 1000 W |
(d) None of these |
Which statement is correct
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(a) N-type germanium is negatively charged and P-type germanium is positively charged |
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(b) Both N-type and P-type germanium are neutral |
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(c) N-type germanium is positively charged and P-type germanium is negatively charged |
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(d) Both N-type and P-type germanium are negatively charged |
Electric lines of force about negative point charge are
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(a) Circular, anticlockwise |
(b) Circular, clockwise |
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(c) Radial, inward |
(d) Radial, outward |
The size of an atom is of the order of
|
(a) |
(b) |
(c) |
(d) |
