Samacheer Kalvi 7th Science Term 3 Unit 2 Book Back Questions and Answers:

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TN State Board Class 7th Science Subject Term 3 Unit 2 one mark and two mark solutions guide PDF available below.

Science – Term 3

Unit 2 – 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
Answer: (c) 27

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
Answer: (d) Asvini

3. Telescope was invented by
(a) Han Lippershey
(b) Galileo
(c) Nicolus Coppernicus
(d) Ptolemy
Answer: (a) Han Lippershey

4. The galaxy containing young and hot stars is
(a) elliptical galaxy
(b) irregular galaxy
(c) cluster
(d) spiral galaxy
Answer: (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
Answer: (d) Way par GSAT-19

II. Fill in the blanks:

1. Waxing of Moon means _______
2. The heliocentric model is proposed by _______
3. _______ is the prevailing model of the Evolution of the Universe.
4. _______ is a large constellation that covers a large part of the sky.
5. _______ is the first satellite launched by India

Answer:

1. growing or expanding
2. Nicolus copernicus
3. The Big Bang Theory
4. Ursa Major
5. Aryabhatta

III. True or False – If False gives the correct answer:

1. On a full Moon day, when the Sun is setting in the west, Moon rises in the West.
Answer: False
Correct statement: On a full Moon day, when the Sun is setting in the west, Moon rises in the East

2. The word crescent refers to the phases where the Moon is less than half illuminated.
Answer: True.

3. Galileo accepted the Geo-centric model.
Answer: False
Correct statement: Galilio did not accept the Geo-centric model.

4. Our Milky Way galaxy is identified as an elliptical galaxy.
Answer: False
Correct statement: Our Milky Way galaxy is identified as a galaxy.

5. The planet Venus in our solar system doesn’t have a Moon.
Answer: True

IV. Match the following:

Answer:

V. Analogy:

1. Older stars : elliptical galaxies :: younger stars : ___________
Answer: Irregular galaxies.

2. Nearest galaxy: Andromeda :: Nearest star : ___________
Answer: Alpha Centauri.

VI. Very short answer:

1. The word _______ refers to the phases where the Moon is less than half illuminated (crescent / gibbous)
Answer: crescent.

2. ___________ and ___________ planets never appear in the mid-night sky.
Answer: Mercury, Venus.

3. Number of days taken by Mars to orbit around the Sun.
Answer: 687 days.

4. In which phase does the size of the planet Venus is small?
Answer: When it was in Gibbous phase.

5. The only evidence of the big bang theory is
Answer: The only evidence of the big bang theory is a faint glow in space, called cosmic microwave background.

6. The galaxy which contains abundant amount of gas and dust is ___________ ?
Answer: Spiral galaxy.

7. Which country launched the world’s first artificial launch vehicle?
Answer:
Russia launched the world’s first artificial launch vehicle.

VII. Short Answer Questions:

1. What is epicyclic model?
Answer:

1. To explain the puzzling phenomena astronomers in early times proposed a change in the simple geocentric model. This is called as epicycle model.
2. A small circle whose centre is on the circumference of a larger circle, in ptolemic astronomy.
3. It was seen as the basis of revolution of the seven plants, given a fixed central Earth.

2. Name the four different types of Galaxies.
Answer:

1. Spiral galaxy
2. Elliptical galaxy
3. Irregular galaxy
4. Barred spiral galaxy

3. What is a constellation?
Answer: A constellation is a recognizable pattern of stars in the night sky when viewed from the Earth.

4. Give the expansions of PSLV and GSLV.
Answer:
PSLV: Polar Satellite Launch Vehicle.
GSLV: Geosynchronous Satellite Launch Vehicle.

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