Blue colour of sky is due to:
- AScattering.
- BAbsorption.
- CReflection.
- DRefraction.
Blue colour of sky is due to:
Explanation:
Blue light is scattered the most. Hence, as sunlight travels the earth, most of the blue colour is scattered and hence spread. This causes the sky to appear blue in the day.
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Which of the following is used to produce radio waves of constant amplitude
|
(a) Oscillator |
(b) FET |
(c) Rectifier |
(d) Amplifier |
The field due to a long straight wire carrying a current I is proportional to
|
(a) I |
(b) |
(c) |
(d) 1/I |
In a compound microscope magnification will be large, if the focal length of the eye piece is
|
(a) Large |
(b) Smaller |
|
(c) Equal to that of objective |
(d) Less than that of objective |
A dip circle is at right angle to the magnetic meridian. What will be the apparent dip
| (a) 0° | (b) 30° | (c) 60° | (d) 90° |
$\text{v}$
$\frac{\text{v}}{2}$
$2\text{v}$
$\sqrt{2}\text{v}.$
The current sensitivity of a moving coil galvanometer can be increased by
|
(a) Increasing the magnetic field of the permanent magnet |
|
(b) Increasing the area of the deflecting coil |
|
(c) Increasing the number of turns in the coil |
|
(d) a, b, c |