10.The earth and her neighbors

Std 3

Science chapter no. 10

The Earth and Her Neighbours

Questions and answers

And pdf of textbook

Exercises

A. Tick(√) the correct options and fill in the blanks. 

1.we call the Moon_________when we can see more than half of it. 

Ans. gibbous

2.The spinning of the Earth on its axis is called_____________

Ans. rotation

3.____________was the earliest known Indian astronomer. 

Ans. Aryabhata

4.The galaxy that we live in is called_________.

Ans. The milky Way

5.Another name for the Hunter is __________

Ans. Orion

B. Fill in the blanks. 

1.__________was one of the earliest known astronomers from India. 

Ans. Aryabhata

2.people who work in space are called________

Ans. Astronomers

3.The half of the Earth that faces the sun has_________

Ans. Day

4.The ____________in Delhi can be used to measure time. 

Ans. Jantar mantar

5.____________are huge balls of fire and gas. 

Ans. Stars

C. Answer the following questions in one sentence. 

1.what is the name of the galaxy in which we live? 

Ans. Milky Way is the name of the galaxy. 

2.why can we not feel the movement of the earth? 

Ans. Because we are also moving along with the earth. 

3.If the Moon is smaller than the Earth and the sun, then why does it appear big? 

Ans. Because the moon is very near to the earth. 

4.what is the temperature on the surface of the sun? 

Ans. The temperature on the surface of the sun is 5400°c

D. Answer the following questions in two to threee sentences. 

1.Explain the features that make the Earth a special place. 

Ans. The land, water and air make the earth aspecial place. 

2.what is revolution? How long does the earth take to complete one revolution? 

Ans. Revolution-movement of the earth around the sun The earth take about 365 1/4  days to complete one revolution. 

3.write three sentences about the Moon. 

Ans. 1.The moon is round in shape

2.It is smaller than the earth and much smaller than the sun

3.The moon moves around the earth. 

4.what is a constellation? Name some well-known constellations. 

Ans. Constellation-A group of stars forming different shapes. 

Ursa major (great bear) 

Ursa minor (little bear) 

Orion (the lion) 

Cygnus (the swan) 

5.what do astronauts do? Name two women astronauts who have stayed in the space? 

Ans. The study object in space and conduct experiment some even stay in space for several months at a time Kalpana chawla and Sunita Williams are some of t women's astronauts who lived in spo for some time. 

E. Answer the following questions in brief. 

1.Explain the phases of the moon with diagrams. 

Ans. The changing shapes of the moon ate called the phases of the moon. 

When the moon is between the earth and the sun, we cannot see it at all. This is known as new moon. 

The moon looks like 'c' is called crescent moon. 

Within about week, we see half the moon, this is known as the first quarter. 

When more than half of the moon is visible, it is called it the gibbous moon. 

When the complete, moon is visible, it is called the full moon. 

2.write short notes on 

a. Aryabhata    b. Varahamihira    

C. Bhaskara I. 

Ans. Aryabhata- he was the first man to say that the earth rotates on its axis causing day and night. 

Varahamihira- He studied the astronomy of different countries along with Indian astronomy and wrote many books. 

Bhaskar- He was astronomer who lived about 900 year ago he wrote about the movement of planets and discussed the phases of moon. 

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