Social Lesson 1. Wonder in the Sky
Q.1. Name the planets in the solar family?
Ans. Mercury. Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
Q.2 Why do stars appear small?.
Ans. *The stars are in the sky appear to be smaller than the sun because it is far away from the Sun.*The Sun is also a star but it is closer to the Earth.
Q3. Write a short note on meteor.
Ans. Meteors are a streak of bright light that can be seen from the Earth when meteorite enters the atmosphere. The actual object entering the atmosphere is called meteorite.
Q.4. Why is the light of the Moon not as hot as Suns light?
Ans. The Moon does not have its own light and heat. It reflects the light of the Sun.
Q.5. How do planets remain intact in space?
Planets are so big that they remain gravitionally bound together.
1.The first manmade satellite _Sputnik
2..The first woman to go into space is Valantina toreskara.
3. The first woman of India origin to go into the space _Kalpana Chawla.
4.The first man to go into space __Major Yuri Gagarine.
5. The first Indian artificial satellite was ___Aryabhatta.
Points to remember.
1.*The study of planets and stars is called Astronomy.
2.*The three drawf planets are Ceres,Pluto,Eris.
3. Howmea/2003EL61 is the new member of the solar system.
4.*It takes 1-3 seconds for the moonlight to reach us, while the sunlight takes about 8 minutes to reach us.
5. IRS,IB,INSAT 2A,INSAT 2C,INSAT 3B are names of some Indian artificial Satelites.
Social- lesson 2.Home Plannet.
Q.1. What is an axis?
Ans. An imaginary line which seems to run through the centre of the Earth.
Q.2.What is rotation ?
Ans. The movement of the Earth on its axis is called rotation.
Q3. What is Revolution?
Ans. The movement of the Earth around the sun in a fixed elliptical orbit is called Revolution.
Q.4. What is Globe?
Ans. *A Globe is a mini-model of the Earth.*It has land, water and countries marked on it.*It also has axis around which it moves just like the Earth.