Class 5 General Science (G.Sc.) Notes: - Unit-9: Space and Satellites: Solved Exercise ( MCQs, Questions and Answers)

General Science (G.Sc.) Class 5 Notes

Based on the Single National Curriculum, PK

(New Book/New Syllabus for 2023-2024 Exams and onward)

National Book Foundation
as
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"1. Tick ( ✓ ) the Correct Answers"

i. Countless shining lights seen at night in the sky are: :

(a) the stars
(b) the moons
(c) the planets
(d) different heavenly bodies

... Answer is (d)  different heavenly bodies
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ii. How long does it take for a geostationary satellite to complete one orbit?

(a) One day
(b) One week
(c) One month
(d) One year

... Answer is (a)  One day
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iii. Who was the first man to step on the moon?

(a) Edwin Aldrin
(b) Neil Armstrong
(c) Yuri Gagarin
(d) Alan Shepard

... Answer is (b) Neil Armstrong
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v. The first artificial Satellite was sent into space in

(a) 1945
(b) 1957
(c) 1969
(d) 1973

... Answer is (b) 1957
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"2. Write Short Answers"

Q(i). Write five benefits we get from artificial Satellites.

Ans: 

1. Radio television transmissions and information via the internet reach every part of the world because of artificial satellites. 

2. Artificial satellites are used in weather forecasting i.e. rainfall, snowfall, storm, etc. 

3. We can contact distant locations by telephone or mobile using Satellite services.

4. Artificial satellite helps us to take precaution against floods, Storms, and forest fires effectively.

5. We can navigate effectively with the help of satellite-provided GPS services.

Q(ii) The Moon is a satellite of the Earth. Is the Earth also the satellite of a bigger heavenly object? What is the name of that object?

Ans: A Satellite is an object that moves around a large object. Earth is also a satellite because it moves around the sun.

Q(iii). Why does a geostationary satellite appear to be stationary? 

Ans: A geostationary satellite is launched in such a way that it follows an orbit parallel to the equator and travels in the same direction as the earth's rotation with the same period of 24 hours (1 day). Thus, it appears stationary with respect to the earth's surface. 

Q(iv). Why do the astronauts wear space suits? 

Ans: Space suits protect astronauts from getting too hot or cold. Space suits also give astronauts oxygen to breathe while they are working in space. The suits hold water to drink. They also keep astronauts from getting hurt by space dust.  Astronauts need space suits to stay alive. Space suits are specially designed to protect astronauts from the cold, radiation, and low pressure in space. Wearing a space suit allows an astronaut to survive and work in space.

Q(v). Why a telescope installed on a satellite can take clearer photographs than a telescope on the Earth?

Ans: Because the Hubble telescope is located in space. Earth's atmosphere does not interfere with light from objects the telescope is aimed at. This lack of interference allows it to obtain clearer images than ground-based telescopes with much larger mirrors. 

3. "Constructed Response Question"

Q(i). What provides the force needed to keep artificial satellites moving around the Earth? Indicates its direction on the two satellites shown in the given figure. 

Ans: When a satellite is in circular orbit gravity is the only force acting on it, which means the centripetal force and gravity must be equal Fc = Fg. Even when satellites are thousands of miles away, Earth's gravity still tugs on them.

Q(ii). The astronauts have to face lots of problems in space. Can you name some of those problems?

Ans: 

i. radiation     

ii. lack of gravity     

iii. disruption of senses 

iv. bone and muscle deterioration 

v. Health risks

Q(iii). How do the astronauts breathe in space?

Ans: Astronauts bring oxygen from Earth and they make oxygen by running electricity through water. This is called electrolysis. The air and water in the space station all originally came from the earth.

Q(iv) Why cannot you pour water in a glass in space?

Ans: Water poured into space (outside of the spacecraft) would rapidly vaporize or boil away. In space, because there is no air pressure, water boils away at an extremely low temperature.

4. "Investigate Question "

Q. Search in a public library or on the internet what kinds of experiments are conducted in the international space station that cannot be done while living on Earth? 

Ans:

Following are some experiments conducted in the international space station:

i. Space mice

ii. Headless flatworms 

iii. ISS, Robot

iv. Ant Farm

v. The Global Ecosystem Dynamics Investigation

vi. Cloud-Aerosol Transport Systems 

viii. Drug development using protein Crystals

ix.  Testing tissue chips in space

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1.  5th Class: English Notes

2.  5th Class: Social Study (S.St.) Notes

3.  5th Class: General Science (G.Sc.) Notes

4.  5th Class: Urdu (اُردو) Notes

5.  5th Class: Islamiyat (اسلامیات) Notes

6.  5th Class: Mathematics Notes

7.  Easy English Grammar Notes

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