CBSE Class 8 Science Stars and the Solar System Assignment Set C

A.TICK THE CORRECT OPTIONS:

Question. When the moon is in between the Earth and the Sun, we see_____________ .
(a) New moon
(b) Full moon
(c) Quarter moon
(d) Crescent moon
Answer. a New moon

Question. Which of the following is not an inner planet?
(a) Mercury
(b) Neptune
(c) Mars
(d) Earth
Answer. b Neptune

Question. The planet that has minimum time period of rotation is the______________ .
(a) Earth
(b) Mercury
(c) Venus
(d) Jupiter
Answer. d Jupiter

Question. Which of the following has no satellite?
(a) Saturn
(b) Venus
(c) Neptune
(d) Jupiter
Answer. b Venus

Question. Which of the following planets is the largest planet of the solar system?
(a) Jupiter
(b) Earth
(c) Uranus
(d) Saturn
Answer. Jupiter

B.FILL IN THE BLANKS
1. The ________is the brightest star in the sky at night.
2. Orion constellation is also called the _________constellation.
3. ____________ comet appears nearly after every 76 years.
4. A meteoroid that lands on the Earth’s surface is called_________.
5. Ursa Major is also called _________________________.
6. Pole Star is not visible in _________________________.
7. The full moon night is also called __________________.
8. The moon rotates about its axis in about the __________ time that it to orbit the Earth.
Answer.
1.Sirius       4. Meteorite                      7. Purnima
2.Hunter     5.Great Bear constellation  8. 27days 8 hours
3. Halley’s   6.Southren hemisphere

C. VERY SHORT ANSWER QUESTIONS:

Question. What is the temperature of the moon’s surface (a) in daytime (b) at night?
Answer. The temperature of the moon’s surface is
(a) In daytime = 123o C (b) at night = --- 233o C

Question. In which parts of the sky can you find Venus if is visible as an evening star?
Answer. Venus appears in the western sky after sunset that is why it is called as evening star.

Question. Name the largest planet in our solar system.
Answer. The largest planet in our universe is Jupiter.

Question. Name two planets that rotate from the east to the west.
Answer. Venus and Uranus are the two planets that rotate from the east to the west.

Question. What is a comet?
Answer. A comet is a small body of ice and dust that revolves around the sun in highly elliptical orbit.

Question. Name two dwarf planets.
Answer. Two dwarf planets are Pluto and Ceres.

D. SHORT ANSWER QUESTIONS:

Question. Why does the Sun appear to be larger and brighter than other stars?
Answer. The Sun appear to be larger and brighter than other stars because it is closer to the Earth than any other star.

Question. Which planet is called red planet and why?
Answer. Mars is called as red planet as its whole surface is covered with red coloured dust (iron oxide) and rock.

Question. Why does the pole star appear stationary?
Answer. Pole star is situated above the axis of rotation of the earth, so it appears stationary from the earth.

Question. What do you mean by light year?
Answer. One light year is the distance travelled by the light in one year, that is equal to 9.46x 1012 Km.

Question. Why can we never see the backside of the moon from the Earth?
Answer. We never see the backside of the moon from the Earth because the moon rotates about its axis in about the same time that it takes to orbit the Earth. This results in the same face turned towards the Earth at all times.

Question. What are asteroids?
Answer. Asteroids are small irregular shaped heavenly bodies of rocks and metals that revolve around the Sun in the gap between the orbits of Mars and Jupiter.

Question. Write any three points about Ursa Minor constellation.
Answer. (1) It is clearly seen in the northern part of the sky in July during the summer season.
(2) There are seven prominent stars in this constellation that form the shape of a dipper.
(3) At the end of the tail of Ursa Minor is the pole star.

Question. Why does life exists on the Earth? Write three conditions.
Answer. The Earth is at the right distance from the Sun. So, it has some special environmental conditions like right temperature range, the presence of water, a suitable atmosphere and a blanket of ozone. These are responsible for the existence and continuation of life on the Earth.

Question. Write any three differences between meteors and meteorites.
Answer.

G. Long Answer Questions:

Question. What is meant by the following phases of the moon: -
(a) New moon, (b) crescent moon, (c) first quarter moon, (d) gibbous moon and (e) full moon?
Answer. (a) New moon:-
When the moon is between the Earth and the Sun and we do not see the moon at all, it is called new moon. It is also known as Amavasya.

(b) Crescent moon:-
When we see a small sun – lit portion of the moon, it is called crescent moon. The increasing size of the lighted part of the moon is called waxing crescent moon where as the decreasing size of the lighted part of the moon is called waning crescent moon.

(c) first quarter moon:-
After new moon, when we see half the moon, it is called the first quarter moon.

(d) Gibbous moon:-
When we see more than half of the moon, it is called gibbous moon. The increasing and decreasing size of the lighted part of the moon is called waxing and waning gibbous moon.

(e) Full moon:-
After two weeks when the whole sun –lit portion of the moon is visible, it is called full moon. The full moon night is called `purnima’. The full moon is very bright because of the maximum moonlight.

Question. Differentiate between a star and a planet.
Answer.

Question. (a) What are artificial satellites?
Answer. An artificial satellite is a human-made object that has been placed into the orbit around the Earth or other planets to perform specific fuctions.
First artificial satellite was Sputnik-I by USSR and the first Indian satellite was Aryabhatta.

(b) Give three uses of artificial satellites.
Answer. Artificial satellites are used for:-
1. Forecasting weather
2. Transmitting radio and television signals.
3. Telecommunication- -- cellular phones and long distance telephones, fax,etc., are few of the services provided by satellite communication.

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