MCQ
A passenger in an aeroplane shall:
- ANever see a rainbow.
- BMay see a primary and a secondary rainbow as concentric circles.
- CMay see a primary and a secondary rainbow as concentric arcs.
- DShall never see a secondary rainbow.
✓
Answer
- May see a primary and a secondary rainbow as concentric circles.
Solution:
As aeroplane is at higher altitude, the passenger in an aeroplane may see a primary and a secondary rainbow like concentric circles.
Key Concept:
- If an object move with constant speed (V0) towards a convex lens from infinity to focus, the image will move slower in the beginning and then faster. Also $\text{V}_\text{i}=\Big(\frac{\text{f}}{\text{f}+\text{u}}\Big)^2\text{V}_0$.
- If an object approaches the lens, the image moves away from lens with a non-uniform acceleratiion.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A hole diffuses from the p-side to the n-side in a p-n junction. This means that.
A cube of a metal is given a positive charge Q. For the above system, which of the following statements is true
|
(a) Electric potential at the surface of the cube is zero |
|
(b) Electric potential within the cube is zero |
|
(c) Electric field is normal to the surface of the cube |
|
(d) Electric field varies within the cube |
The toroid of radius 10 cm has 100 turns. If a current of 0.1 ampere is flowing in it, then the value of the magnetic field on the axis of the toroid will be:
A nucleus decays by 
emission followed by a gamma emission. If the atomic and mass numbers of the parent nucleus are Z and A respectively, the corresponding numbers for the daughter nucleus are respectively.
|
(a) Z - 1 and A - 1 |
(b) Z + 1 and A |
(c) Z - 1 and A |
(d) Z + 1 and A - 1 |
NAND and NOR gates are called universal gates primarily because they:
Which among the following has a frequency range of 500 kHz to 1000 MHz?
How does the potential difference change with the effect of the dielectric when the battery is kept disconnected from the capacitor?
Assertion : Through the same current flows through the line wires and the filament of the bulb but heat produced in the filament is much higher then that in line wires.
Reason : The filament of bulbs is made of a material of high resistance and high melting point.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
When monochromatic source is kept at distance of $0.2$ m from photocell, cutoff voltage obtained is $0.6 V$ and saturation current is $18 mA$ . Now if source is kept at distance of $0.6 m$ __________ .
→Boron rods in a nuclear reactor are used to: