If current flowing through shell of previous objective is equal to i, then energy density at a point distance 2R from axis of the shell varies according to the graph
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(a)
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(b)
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(c)
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(d)
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(b)
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Let 
and 
be the number of holes and conduction electrons respectively in a semiconductor. Then
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(a) |
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(b) |
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(c) |
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(d) |
99% of a radioactive element will decay between
|
(a) 6 and 7 half lives |
(b) 7 and 8 half lives |
|
(c) 8 and 9 half lives |
(d) 9 half lives |
A single slit of width a is illuminated by violet light of wavelength 400 nm and the width of the diffraction pattern is measured as y. When half of the slit width is covered and illuminated by yellow light of wavelength 600 nm, the width of the diffraction pattern is
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(a) The pattern vanishes and the width is zero |
(b) y / 3 |
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(c) 3y |
(d) None of these |
In a Young’s double slit experiment, the slit separation is 1 mm and the screen is 1 m from the slit. For a monochromatic light of wavelength 500 nm, the distance of 3rd minima from the central maxima is
|
(a) 0.50 mm |
(b) 1.25 mm |
(c) 1.50 mm |
(d) 1.75 mm |
What is the ratio of heat generated in R and 2R
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 4 : 1 |
(d) 1 : 4 |
If nearly 
coulomb liberate 1 gm equivalent of aluminium, then the amount of aluminium (equivalent weight 9) deposited through electrolysis in 20 minutes by a current of 50 amp will be
|
(a) 0.6 gm |
(b) 0.09 gm |
(c) 5.4 gm |
(d) 10.8 gm |
