Universal and Space

Samacheer Book Back Questions And Answers For Science Standard 7 Term 3 “Universal and Space“

I. Choose the correct answers:
1. The Moon takes _____ days to complete one revolution around the Earth.
(a) 25
(b) 26
(c) 27
(d) 28

2. If the Moon is appearing in the sky today near the star Karthikai, the position of the Moon after 27 days is near the Star
(a) Bharani
(b) Karthikai
(c) Rohini
(d) Asvini

3. Telescope was invented by
(a) Han Lippershey
(b) Galilio
(c) Nicolus Coppernicus
(d) Ptolomy

4. The galaxy containing young and hot stars is
(a) Elliptical galaxy
(b) Irregular galaxy
(c) Cluster
(d) Spiral galaxy

5. With the launch of this satellite, ISRO became capable of launching 4 ton heavy satellites
(a) GSAT- 13
(b) GSAT- 14
(c) GSAT-17
(d) Way par GSAT-19

II. Fill in the blanks:
1. Waxing of Moon means_____.
2. Heliocentric model is proposed by _____.
3. _____ is the prevailing model of Evolution of the Universe.
4. _____ is a large constellation which covers a large part of the sky.
5. _____ is the first satellite launched by India

Answers:
1. Growing or expanding
2. Nicolaus Copernicus
3. The Big Bang Theory
4. Ursa Major
5. Aryabhata

III. True or False – If False give the correct answer:
1. On a full moon day, when the Sun is setting in the west, Moon rises in the West.
2. The word crescent refers to the phases where the Moon is less than half illuminated.
3. Galilio accepted the Geo-centric model.
4. Our Milky Way galaxy is identified as an elliptical galaxy.
5. The planet Venus in our solar system doesn’t have a Moon.

Answers:
1. False (On a full moon day, when the Sun is setting in the west, Moon rises in the East)
2. True
3. False (Galilio did not accepted the Geo-centric model)
4. False (Our Milky Way galaxy is identified as a galaxy)
5. True

IV. Match the following:
1. Rohini                A. GSLV-Mark III
2. GSAT-14            B. GSLV Mark III D l
3. GSAT-19            C. SLV-3
4. Chandrayaan-2 D. PSLV-XL C25
5. Mangalyaan      E. GSLV-D5

Answers:
1. C
2. E
3. B
4. A
5. D

V. Analogy:
1. Older stars: elliptical galaxies:: younger stars: _____.
2. Nearest galaxy: Andromeda:: Nearest star: _____.

Answers:
1. Irregular galaxies
2. Alpha Centauri

VI. Very short answer:
1. The word _____ refers to the phases where the Moon is less than half illuminated (cresent / gibbous)
2. _____ and _____ planets never appear in the mid-night sky.
3. Number of days taken by the Mars to orbit around the Sun.
4. In which phase does the size of the planet Venus is small?
5. The only evidence of the big bang theory is
6. The galaxy which contains abundant amount of gas and dust is_____.
7. Which country launched the world’s first artificial launch vehicle?

Answers:
1. Cresent
2. Mercury, Venus
3. 687 days
4. When it was in Gibbous phase
5. Faint glow in space, called cosmic microwave background
6. Spiral galaxy
7. Russia launched the world’s first artificial launch vehicle

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