2. Q2 Name these:
1) FIRST MAN TO GO INTO SPACE- YURI GAGARIN
2) FIRST WOMAN TO GO INTO SPACE- VALENTINA TERESHKOVA
3) FIRST PEOPLE TO VISIT THE MOON:
NEIL ARMSTRONG
EDWIN ALDRIN
MICHAEL COLLINS
4) FIRST SPACECRAFT TO VISIT MOON
APOLLO 11
3. Q3 Give reasons
a) There is no life on Moon
Ans- Since Moon has no air and water , there is no
life on it.
4. b) Moon cannot keep an atmosphere around itself
Ans Gravity on the Moon is one-sixth that of the
Earth. Due to weak gravity it cannot keep an
atmosphere around itself.
5. c) There is no sound on Moon
Ans Since there is no air on Moon, there is no
sound on it.
6. d)Moon is extremely hot during the day and
freezing cold at night.
Ans As Moon has no atmosphere , it becomes too
hot during the day and freezing cold at night.
7. e) Moon has no light of its own
Ans Moon has no light of its own. It shines
because it reflects the sun’s light falling on it.
8. Q4 What are tides?
Ans The rise and fall of the level of water
bodies in water bodies like seas and oceans
caused by gravitational pull of the Moon is
called tides.
Diagram of tide – book page no - 119
9. Q5 What are high tides and low tides ?
Ans- High and low tides refer to the regular rise and fall
of the ocean's waters.
High tide is when water covers much of the shore after
rising to its highest level.
Low tide is when the water retreats to its lowest level,
moving away from the shore .
10. Q6 What is an eclipse?
Ans - An eclipse occurs when one
heavenly body such as a moon or
planet moves into the shadow of
another heavenly body
12. Q8. What are Artificial Satellites ?
Ans - Artificial Satellites are man made satellites that revolves
around the Earth . These Satellites perform different functions like
a. Weather Satellites - Predict weather and sends information
about storms , ocean current . This information helps in warning
people about the upcoming storms and flood
b. Science Satellites - Collect information about outer space. This
information is of great use to the astronomers
c. Communication Satellites- Are used to send signals for TV ,
radio programmes , functioning of fax machines , internet ,
navigation of ships and aircrafts .
13. Q9. Write names of few Indian Satellites
Ans - Arya Bhatta , IRS- IB , Insat – 2 A , Rohini are few Indian Satellite .
Q10. Write features of spacesuit that helps astronauts to survive in the
space .
Ans - Features of space suit that helps astronauts to survive in space are :
a. They wear helmet which have microphones to communicate , glass for
protection against UV rays
b. Insulated boots to maintain temperature
c. Propulsion system to control movement
d. Oxygen control to breathe
