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Question (1)

QN0031308

A student in Ladakh observes 120 stars from a dark location, while another student in a brightly lit city observes only 30 stars. Which factor most likely explains this difference?

(A) Difference in Earth’s rotation
(B) Light pollution in the city
(C) Greater distance of city stars
(D) Different seasons in both places

Correct Answer: B

Explanation:

Excessive artificial lighting in cities causes light pollution, reducing the visibility of stars.

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Question (2)

QN0031309

The distance between Earth and the Sun is about 150 million km. If a spacecraft travels one-third of this distance, how far has it travelled?

(A) 25 million km
(B) 50 million km
(C) 75 million km
(D) 100 million km

Correct Answer: B

Explanation:

One-third of 150 million km = 150 ÷ 3 = 50 million km.

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Question (3)

QN0031310

A traveller in the Northern Hemisphere locates the Pole Star. In which direction should the traveller move to go north?

(A) Opposite to the Pole Star
(B) Towards the Pole Star
(C) Perpendicular to the Pole Star
(D) Towards the Moon

Correct Answer: B

Explanation:

The Pole Star appears nearly stationary in the northern direction and helps locate north.

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Question (4)

QN0031311

A student waits only 5 minutes after reaching a dark site for sky observation and sees fewer stars. What should the student have done?

(A) Used a brighter torch
(B) Waited about 30 minutes for eyes to adjust
(C) Observed near street lights
(D) Watched only at dawn

Correct Answer: B

Explanation:

Eyes need about 30 minutes to adapt to darkness for better night sky viewing.

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Question (5)

QN0031312

The Earth takes nearly one year to complete one revolution around the Sun. Approximately how many revolutions will Earth complete in 20 years?

(A) 10
(B) 20
(C) 365
(D) 730

Correct Answer: B

Explanation:

Earth completes one revolution around the Sun every year. Therefore, in 20 years it completes 20 revolutions.

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Question (6)

QN0031313

Which statement correctly explains why the Sun appears much larger than Sirius, although Sirius is actually very large?

(A) The Sun produces more light than Sirius
(B) The Sun is much closer to Earth
(C) Sirius is not a star
(D) Sirius reflects sunlight

Correct Answer: B

Explanation:

The Sun appears larger because it is much closer to Earth than Sirius.

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Question (7)

QN0031314

If the Moon completes one revolution around Earth in about 27 days, approximately how many revolutions does it complete in 54 days?

(A) 1
(B) 2
(C) 3
(D) 4

Correct Answer: B

Explanation:

Number of revolutions = 54 ÷ 27 = 2.

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Question (8)

QN0031315

A celestial object shines brightly at dawn and dusk and does not twinkle significantly. It is most likely

(A) Sirius
(B) Venus
(C) Pole Star
(D) Betelgeuse

Correct Answer: B

Explanation:

Venus is commonly seen at dawn and dusk and does not twinkle much.

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Question (9)

QN0031316

Which pair consists entirely of giant outer planets?

(A) Earth and Mars
(B) Mercury and Venus
(C) Jupiter and Saturn
(D) Venus and Neptune

Correct Answer: C

Explanation:

Jupiter and Saturn are giant outer planets composed mainly of gas.

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Question (10)

QN0031317

A comet approaches the Sun and develops a long tail. What causes the tail to form?

(A) Reflection from planets
(B) Evaporation of frozen material
(C) Collision with asteroids
(D) Rotation of the comet

Correct Answer: B

Explanation:

Heat from the Sun causes the comet's ice and gases to evaporate, forming a tail.

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Question (1)

A student in Ladakh observes 120 stars from a dark location, while another student in a brightly lit city observes only 30 stars. Which factor most likely explains this difference?

Explanation:

Link:

Question (2)

The distance between Earth and the Sun is about 150 million km. If a spacecraft travels one-third of this distance, how far has it travelled?

Explanation:

Link:

Question (3)

A traveller in the Northern Hemisphere locates the Pole Star. In which direction should the traveller move to go north?

Explanation:

Link:

Question (4)

A student waits only 5 minutes after reaching a dark site for sky observation and sees fewer stars. What should the student have done?

Explanation:

Link:

Question (5)

The Earth takes nearly one year to complete one revolution around the Sun. Approximately how many revolutions will Earth complete in 20 years?

Explanation:

Link:

Question (6)

Which statement correctly explains why the Sun appears much larger than Sirius, although Sirius is actually very large?

Explanation:

Link:

Question (7)

If the Moon completes one revolution around Earth in about 27 days, approximately how many revolutions does it complete in 54 days?

Explanation:

Link:

Question (8)

A celestial object shines brightly at dawn and dusk and does not twinkle significantly. It is most likely

Explanation:

Link:

Question (9)

Which pair consists entirely of giant outer planets?

Explanation:

Link:

Question (10)

A comet approaches the Sun and develops a long tail. What causes the tail to form?

Explanation:

Link:

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