At noon the sun appears white because:
- ALight is least scattered.
- BAll the colours of the white light are scattered away.
- CBlue colour is scattered the most.
- DRed colour is scattered the most.
At noon the sun appears white because:
Explanation:
At noon because the sun is overhead, the light is scattered the least and hence appears white. When it is overhead, it has lesser air to travel through and the scattering from dust and other particles is reduced if the distance to be travelled in air is reduced.
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In the circuit shown, the point ‘B’ is earthed. The potential at the point ‘A’ is
|
(a) 14 V |
(b) 24 V |
(c) 26 V |
(d) 50 V |
Which of the following is used to produce radio waves of constant amplitude
|
(a) Oscillator |
(b) FET |
(c) Rectifier |
(d) Amplifier |
The focal length of the field lens (which is an achromatic combination of two lenses) of telescope is 90 cm. The dispersive powers of the two lenses in the combination are 0.024 and 0.036. The focal lengths of two lenses are
|
(a) 30 cm and 60 cm |
(b) 30 cm and – 45 cm |
|
(c) 45 cm and 90 cm |
(d) 15 cm and 45 cm |
Two condensers of capacities 1μF and 2 μF are connected in series and the system is charged to 120 volts. Then the P.D. on 1 μF capacitor (in volts) will be
|
(a) 40 |
(b) 60 |
(c) 80 |
(d) 120 |
In nuclear reaction
A denotes
|
(a) Electron |
(b) Positron |
(c) Proton |
(d) Neutron |
The lowest resistance which can be obtained by connecting 10 resistors each of 1/10 ohm is
|
(a) 1/250 Ω |
(b) 1/200 Ω |
(c) 1/100 Ω |
(d) 1/10 Ω |
Three resistors each of 4Ω are connected together to form a network. The equivalent resistance of the network cannot be
|
(a) 1.33 Ω |
(b) 3.0 Ω |
(c) 6.0 Ω |
(d) 12.0 Ω |