Q.1 State tove or falte
False .!
computer can't perform multiply tasks together
Answers
Answer:
[20/05, 11:53 am] Khushbu Burnwal: Solar system
Chapter 1
D. Answer the following questions in brief.
1. What are celestial bodies?
Ans. All the objects in the sky, which appear similar to us, are the heavenly bodies. The sun, the
stars, the moon, the planets and other objects are all heavenly or celestial bodies
2. Why do stars look very small in the sky?
Ans .The stars are very, very far away from us. Hence, they look very small to us.
3. What is ‘Saptarishi Mandal’?
The seven stars called Saptarishi Mandal, is a part of Great Bear.
It is the constellation.
4. Name the planets which are gaseous bodies.
Two of the outer planets, Jupiter and Saturn, are known as gas giants whereas the
more distant, Uranus and Neptune, are called ice giants.
5. Which planet is the closest to Neptune?
Uranus
[20/05, 11:54 am] Khushbu Burnwal: E. Answer the following questions.
1. Describe the formation of solar system.
Some scientists believe that a giant cloud of gases and dust, called the Nebula,
appeared moving in the space about 4.6 billions of years ago.
It cooled and gained very fast rotation. The eight balls of gases of different sizes
were separated from the Nebula.
The remaining central mass of the Nebula changed into a star known as the Sun.
The other eight balls changed into planets.
2. State three features which make the earth a unique planet.
Firstly, the earth receives moderate heat and light from the sun. This much
quantity of heat and light is just sufficient to evolve and sustain all forms of life on
the earth’s surface. Other planets are either very hot or very cold.
Secondly, about two-third of earth’s area is covered with water. Water is essential
for human beings, animals and plants. No life can exist without water.
Thirdly, the earth has an envelope of air around it. It contains gases, water
vapours and dust particles which help in supporting life on the planet. Earth’s
atmosphere protects us from the incoming meteoroids.
3. Mention three main characteristics of a satellite.
a.The heavenly bodies that revolve around their respective planets are called
Satellites.
b.Like the planets, satellites also do not have their own light and heat.
c.They reflect light, which they receive from the sun.
[20/05, 11:54 am] Khushbu Burnwal: 4. Give a brief description on the Phases of Moon with the help of a diagram.
The visible portion goes on increasing gradually day by day after the New Moon
Day. At first, the moon appears in crescent shape. On eighth day, half portion of
the moon comes in our view. The full moon becomes visible after 15 days when
half of its revolution is completed. The day when the moon is completely visible
to us, is the Full Moon Day (Purnima). After this day, the decline of the moon’s
illuminated part starts. The illuminated part slowly disappears and the moon
again comes to the position of New Moon.
Refer pg 8(for diagram)
5. Write a short note on the other celestial bodies ( asteroids, meteoroids and
comets) in the solar system
Answer:
False .Multitasking is a common feature of computer operating systems.
Hope it helps you :)☺