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Published on: 29/10/2025
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Questions + Answers key
Take MCQ Science Test
1.
Which of the following is not a member of the solar system?
An asteroid
A satellite
A constellation
A comet
2.
Phases of the moon occur because
we can see only that part of the moon which reflects light towards us
our distance from the moon keeps changing
the shadow of the earth covers only a part of the moon's surface
the thickness of the moon's atmosphere is not constant
3.
The change in seasons on the earth occurs because
the distance between the earth and the sun is not constant
the axis of rotation of the earth is parellel to the plane of its orbit
the axis of rotation of the Earth is perpendicular to the plane of its orbit
the axis of rotation of the Earth is tilted with respect to the plane of its orbit
4.
Which star is nearest to the Earth?
Pole star
Cassiopeia
Orion
Sun
5.
Morning star is the name given to
Pole Star
star Sirius
planet Jupiter
planet Venus
6.
State, which planet of the solar system is largest and smallest in size.
7.
Give the name of the periodic comet. Why is it called so?
8.
As the Sun is also a star, then why does it appear so large as compared to the other stars?
9.
Why does the moon change its shape daily?
10.
What do you mean by constellation? Name any two.
11.
Meteors are not visible during the daytime. Explain the reason.
12.
Can you distinguish between planets and stars?
13.
Write the difference between revolution and rotation.
14.
What is waxing and vanning of moon?
15.
Last week, Ramesh (a science teacher) was teaching about the planets to his students of class 5th• After giving a small lecture on planets, he started cross questioning with his students on the same topic. He found that almost, all the students answered all the questions. He asked following questions:
(i) Give the names of all the planets of solar system with respect to their distance from the Sun.
(ii) Name the planet on which the life is known to exist.
(iii) Mention the values shown by students of Ramesh here.
16.
Explain the difference between a natural and an artificial satellite. Enlist any three applications of artificial satellite.
17.
Across:
(i) Groups of stars
(iii) A use of artificial satellite
Down:
(ii) Constellation with seven stars looking like questions mark.
(iv) The other name of Milky way.
1.
(c)
A constellation
2.
(a)
we can see only that part of the moon which reflects light towards us
3.
(a)
the distance between the earth and the sun is not constant
4.
(d)
Sun
5.
(d)
planet Venus
6.
Largest planet of solar system is Jupiter and smallest planet is Mercury.
7.
The periodic comet is Halley's comet, as it appears after regular interval of time (76 years).
8.
The stars are millions of times farther away than the Sun. So, the stars appear to us like points and the Sun is like a large sphere.
9.
Moon changes its shape daily because it revolves around the Earth and the light from the sun continuously changes due to the presence of Earth between moon and the Sun.
10.
The stars forming a group that has recognizable shape are called a constellation. Ursa major and Orion.
11.
Meteors are very small objects which glow due to friction when they enter the Earth's atmosphere.They are not visible during the daytime because of being very small in size and due to the Sun's brightness.
12.
Yes, stars twinkle whereas planets do not. Also the planets keep changing their position with respect to the stars.
13.
Difference between revolution and rotation:
| S.No | Revolution | Rotation |
| (i) | The time taken by a planet to complete one revolution is called its period of revolution. |
A planet also rotates on its own axis like a top. The time taken by a planet to complete one rotation is called its period of rotation |
| (ii) | The period of revolution increases as the distance of the planet increases from the sun | It is always fixed. |
14.
Different phases of moon are visible from the Earth. This change in shapes occurs due to variation in sunlight reflected by moon from its surface. At certain times, it appears to be bright whereas at others it appears to be dark. When brightness of moon is increasing, it is called waxing, when brightness of moon is decreasing, it is called vanning.
15.
(i) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
(ii) Earth is the planet on which the life is known to exist.
(ill) Students of Ramesh seem to be very sharp minded and intelligent. They learn all the facts immediately which Ramesh teaches them.
16.
Difference between a natural and an artificial satellite.
| Natural satellites | Artificial satellites |
| Those heavenly bodies which revolve around a planet in their fixed orbits. |
Those man made bodies which are fitted with large sensitive instruments and cameras |
| These are comparatively bigger in size and are made satellites up of rocky materials or gases. |
Made to rotate around their planets in pre-fixed orbits. These satellites are much closer to their planet, e.g. Earth. |
| Example of natural satellite is moon. | Examples of artificial satellite are IRS, INSAT, Kalpana-1, EDUSAT, etc. |
Applications of artificial satellites are
(i) These kinds of satellites are used for weather for casting such as rainfall, snowfall, etc.
(ii) For communication purpose such as long distance transmission of telephone calls, TV programmes, internet the artificial satellites are used.
(iii) The natural sources of earth are usually surveyed by the artificial satellites.
17.
(i) Constellations
(ii) Ursa Major
(iii) Remote sensing
(iv) Akash Ganga
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