Advanced Sunrise and Delayed Sunset

Q. What is advanced sunrise and delayed sunset?

Q.

Why is the Sun seen a few minutes before it actually rises?

Q. With the help of suitable diagram, explain the phenomenon of early sunrise and delayed sunset.

Q.

What is the reason for the apparent flattening of the sun’s disc at sunset and sunrise?

1. Atmospheric refraction
2. Scattering
3. tyndall effect
4. Dispersion

Q.

Why is the actual position of a star different from the apparent position?

1. because star acts as a point source of light

2. because starlight undergo refraction while entering atmosphere

3. due to changing refractive index of atmosphere

4. all of the above

Q. Explain why, the sun can be seen about two minutes before actual sunrise. Draw a diagram to illustrate your answer.

Q.

The day is longer on the earth by about 4 minutes because :
(a) the earth is round in shape (b) the earth rotates on its axis
(c) the earth revolves around the sun (d) the earth has atmosphere

Q.

What is speed of light in a denser medium of Polarising angle ${30}^{\circ }$?

Q.

What is apparent flattening of sun's disc

Q.

How much time from sunrise to sunset is lengthened because of atmospheric refraction?

1. 2 minutes

2. 4 hours

3. 4 minutes

4. 2 hours

Q.

An object in a denser medium when viewed from a rearer medium appears to be raised.The shift is maximum for which colour of light.

Q.

Deviation of light as it passes through the atmosphere due to variation in air density is called

1. atmospheric scattering

2. atmospheric refraction

3. atmospheric dispersion

4. atmospheric reflection

Q.

The advanced sunrise and the delayed sunset are because of the atmospheric refraction.

1. True
2. False

Q. Atmospheric refraction causes advance sunrise and delayed sunset. By how much time is :
(a) sunrise advanced ?
(b) sunset delayed ?

Q.

Which phenomenon is responsible for increasing the apparent length of the day by 4 minutes?

1. Dispersion

2. Atmospheric refraction

3. Tyndall effect

4. Scattering

Q. What is atmospheric refraction?

Q.

The apparent flattening of sun at sunrise and sunset is due to atmospheric refraction?

1. True

2. False

Q.

Statement1: There is a time delay between the actual sunrise and the apparent sunrise.

Statement2: Since the earth is spinning on its axis, so it takes sunlight 4 minutes to travel from one longitude to another.

1. Both statements are wrong

2. Statement 1 is correct but statement 2 is incorrect.

3. statement 1 and 2 are correct but statement 2 is not the reason of statement 1

4. Statement 1 and 2 are correct and statement 2 is the correct reason for statement 1

Q.

The light of distant stars is affected by

1. (A) Interstellar Dust

2. (B) The Earths Atmosphere

3. (C) Both A & B

4. (D) None of the above

Q. Fill in the following blanks with suitable words :
We can see the sun about ___ minutes before the actual sunrise and about ___ minutes after the actual sunset because of atmospheric ___

Q. We can see the sun before the actual sunrise by about :
(a) 5 minutes (b) 2 minutes (c) 2 hours (d) 20 minutes

Q.

The apparent flattening of sunrise and sunset is due to atmospheric refraction.

1. True

2. False

Q.

When light rays from stars enter into earth's atmosphere, it travels from

1. rarer to denser medium

2. denser medium to vacuum

3. denser to rarer medium

4. rarer medium to vacuum

Q.

Why does the Sun appear circular at noon?

1. The rays of light from upper edges of sun have to pass maximum thickness.

2. The rays of the Sun have to pass through minimum thickness of air.

3. The rays of light from the lower edges of Sun are refracted more.

4. None of the above.

Q.

What is the reason for the apparent flattering of the sun’s disc at sunset and sunrise?

1. Atmospheric refraction
2. Scattering
3. tyndall effect
4. Dispersion

Q. Sun appears flattened at sunset and sunrise.pls explain in detail

Q. Which phenomenon makes us see the sun :
(a) a few minutes before actual sunrise ?
(b) a few minutes after actual sunset ?

Q. With the help of suitable diagram, explain the phenomenon of early sunrise and delayed sunset.

Q.

Statement 1 - Apparent position of the object keeps fluctuating when seen through a hot air

Statement2 - Hotter air and cooler air have same refractive index, so no dispersion happens.

1. statement 1 is true, statement 2 is true but statement 2 is not the correct reason of statement 1

2. both are incorrect.

3. statement 1 is true, statement 2 is true, and statement 2 is the correct reason for statement

4. statement 1 is correct, but statement 2 is incorrect

Q.

Statement 1: There is a time delay between actual sunrise and apparant sunrise.

Statement 2: Since the earth is spinning on its axis, therefore day and night occur.

1. Statement 1 is correct but statement 2 is incorrect.

2. Statement 1 and 2 are correct but statement 2 is not the reason of statement 1.

3. Both statements are wrong.

4. Statement 1 and 2 are correct and statement 2 is the correct reason for statement 1