10th SCIENCE REFRESHER COURSE MODULE 8 Answer key

• EVALUATION ANSWERS -8
• EVALUATION

I.  CHOOSE THE BEST ANSWER: -

1. Which of the following is a celestial body?

(a) Sun         

(d) Mercury

 (b) Moon 

(c) Stars 

2. Mangalyaan was sent to _____________.

(a) Moon          

(c) Venus

(b) Mars

(d) All the above

3. Chandrayan –I was launched on ___________________.

(a) 22nd October 2008

(c) 22nd July 201

(b) 8th November 2008  

(d) 22nd October 2019

4. ________________ is called as Red Planet.

(a) Mercury     (b) Venus 

(d) Mars        (c) Earth 

5. Which of the following is the working principle of rockets?

(b) Newton’s Second Law 

(a) Newton’s First Law

(c) Newton’s Third Law

(d) All the above

II. FILL IN THE BLANKS:

1. The study of stars and planets are known as ___________________.                                  

Answer : Astronomy

2. Our sun belongs to _________________________ Galaxy.                                                   

Answer :  milky way

3. _________________ is Inida’s                                           

Answer :  mangalyan    first interplanetary mission.

4. _________________ was the first man to walk on the surface of the moon.

Answer :  Neil Armstrong 

5. A study of very low temperature is __________________.                               

Answer :    cryogenic

III. SAY TRUE OR FALSE:

1. The sun and the celestial bodies form solar system.

Answer :  True

2. Chandrayan –I was launched from Sriharikota.

Answer :  True

3. Mars is the smallest planet in the Solar System. 

Answer :  False

4. PSLV and GSLV are India’s popular satellites.

Answer :  False

5. The propellant of a rocket is only in the form of solids.  

Answer :  False

IV. MATCH THE FOLLOWING: -

1. a)  Chandrayan    -  System of millions of stars  d)

b) Mangalyaan  -  Moon a)

c) Cryogenic   -   Mars  b)

d) Galaxy   - Satellites kept in  the launching rockets e)

e) Payload-      Fuel  c)

V.  ANSWER THE FOLLOWING:

1. Give an account of Solar system.

• the planets are much more spread out.Thus the distance between Saturn and Uranus is much greater(about20times) than between the Earth and the Mars.
• ThefourplanetsgroupedtogetherintheinnersolarsystemareMercury,Venus,EarthandMars. Theyarecalledinnerplanets.Theyhaveasurfaceofsolidrockcrustandsoarecalled terrestrialorrockyplanets.Theirinsides,surfacesandatmospheresareformedinasimilarway andformsimilarpattern.Ourplanet,Earthcanbetakenasamodeloftheotherthreeplanets. ThefourlargeplanetsJupiter,Saturn,UranusandNeptunespreadoutintheoutersolarsystem thatslowlyorbittheSunarecalledouterplanets.Theyaremadeofhydrogen,heliumandother gasesinhugeamountsandhaveverydenseatmosphere.Theyareknownasgasgiantsandare calledgaseousplanets.ThefourouterplanetsJupiter,Saturn,UranusandNeptunehaverings whereasthefourinnerplanetsdonothaveanyrings.Theringsareactuallytinypiecesofrock covered with ice.

2.  Explain Kepler’s law.