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Quantam nature of light is explained by which of the following phenomenon
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(a) Huygen wave theory |
(b) Photoelectric effect |
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(c) Maxwell electromagnetic theory |
(d) de-Broglie theory |
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:
Which of the nine planets is nearest to sun
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(a) Venus |
(b) Mercury |
(c) Mars |
(d) Jupiter |
$\text{Mr}^2$
$\frac{1}{2}\text{Mr}^2$
$\frac{1}4{}\text{Mr}^2$
$\frac{2}{5}\text{Mr}^2$
The ratio of the refractive index of red light to blue light in air is
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(a) Less than unity |
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(b) Equal to unity |
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(c) Greater than unity |
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(d) Less as well as greater than unity depending upon the experimental arrangement |
In the circuit shown in figure, each capacitor has a capacity of 3μF. The equivalent capacity between A and B is
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(a) |
(b) 3 |
(c) 6 |
(d) 5 |
In Young's double slit experiment using sodium light (λ = 5898 Å), 92 fringes are seen. If given colour (λ = 5461 Å) is used, how many fringes will be seen
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(a) 62 |
(b) 67 |
(c) 85 |
(d) 99 |
Below figures (1) and (2) represent lines of force. Which is correct statement
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(a) Figure (1) represents magnetic lines of force |
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(b) Figure (2) represents magnetic lines of force |
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(c) Figure (1) represents electric lines of force |
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(d) Both figure (1) and figure (2) represent magnetic lines of force |
When a dielectric material is introduced between the plates of a charged condenser then electric field between the plates
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(a) Decreases |
(b) Increases |
(c) Remain constant |
(d) First (b) then (a) |
