Twinkling of Stars

Q.

Why do stars twinkle?

Q.

Why are stars twinkling while planets arent?

Q.

What the sun gives us?

Q. Twinkling of stars is due to

1. Reflection
2. None of these
3. Dispersion
4. Atmospheric refraction

Q. Why does the sun appear flat during sunrise and sunset. Please explain deeply..

Q.

Why the planets do not twinkle?

Q. Which of the following is the correct order of decreasing wavelength of the waves of the electromagnetic spectrum?

1. Gamma rays > X- rays > Ultraviolet rays
2. X-rays > Gamma rays > Ultraviolet rays
3. Ultraviolet rays > Gamma rays > X- rays
4. Ultraviolet rays > X- rays > Gamma rays

Q. The stars twinkle but the planets do not twinkle at night because :
(a) the stars are small but the planets are large
(b) the stars are very large but planets are small
(c) the stars are much nearer but planets are far off
(d) the stars are far off but planets are nearer to earth

Q.

Explain why planets do not twinkle at night.

Q. Explain with reason :-
a) Twinkling of stars.
b) Advanced sunset and delayed sunrise.
c) Blue colour of sky.
d) Reddish colour of sky during sunrise and sunset.

Q.

Both Sun and a Star have Helium and Hydrogen but the sun light is yellow or orange and the star light is white.

Why?

Q. As light from a far off star comes down towards the earth :
(a) it bends away from the normal
(b) it bends towards the normal
(c) it does not bend at all
(d) it is reflected back

Q.

All the stars are at the same distance from us.

1. True
2. False

Q.

State whether the following statement is true or false :
The planets twinkle at night due to atmospheric refraction of light.

Q.

Why does Earth look blue-green when viewed from the space?

1. Because, Earth has a blue-green colour.

2. Because, Earth emits only blue and green light.

3. Due to scattering of light reflected from water and landmass on its surface.

4. Due to the reflection of light by moon and stars.

Q.

Just before the time of sunset the sun appears to be bigger because

1. sun changes its shape at that time

2. of the scattering of light

3. of the effect of refraction

4. of reflection

Q.

What's the reason for twinkling of stars?

Q.

Explain why planets do not twinkle at night. [2 MARKS]

Q.

Light from the stars reaches our eyes instantaneously. True or false?

1. False

2. True

Q.

STATEMENT 1: Stars appear to twinkle when seen ​from the Moon.​

STATEMENT 2: The refractive index of the Earth’s ​atmosphere is different at different altitudes.​

Q.

The brightest visible star from Earth is _________.

Q.

Why do stars appear twinkling in the sky?

Q. Which among the following is the cause for twinkling of stars?

1. Atmospheric refraction
2. Reflection
3. Persistence of vision
4. None of these

Q.

Question 30
How does refraction takes place in the atmosphere? Why do stars twinkle but not the planets?

Q. Name the phenomenon which causes the twinkling of stars.

Q. What is the reason for the twinkling of stars? [1 Marks]

Q. As there is no atmosphere on the moon, stars do not appear to twinkle when seen from there.

1. False
2. True

Q.

Question 11
Explain why the planets do not twinkle?

Q. Why do stars appear twinkling?

Q.

Explain why the planet do not twinkle