Question 1.
Motion of the earth on its axis in about 24 hours is called
(a) revolution
(b) rotation
(c) both (a) and (b)
(d) none of these
Answer
Answer: (b) rotation
Question 2.
Motion of the earth around the sun is known as
(a) revolution
(b) rotation
(c) both (a) and (b)
(d) none of these
Answer
Answer: (a) revolution
Question 3.
What is orbital plane?
(a) Plane formed by the axis
(b) Plane formed by the orbit
(r) Both (a) and (b)
(d) None of these
Answer
Answer: (b) Plane formed by the orbit
Question 4.
Which one of the following is the source of light on the earth?
(a) The moon
(b) The sun
(c) The satellite
(d) The space
Answer
Answer: (b) The sun
Question 5.
The circle that divides the globe into day and night is called
(a) circle of darkness
(b) circle of day and night
(c) circle of illumination
(d)none of these
Answer
Answer: (c) circle of illumination
Question 6.
The period of one rotation of the earth is known as
(a) the sun day
(b) the moon day
(c) the earth day
(d) none of these
Answer
Answer: (c) the earth day
Question 7.
What would have happened if the earth did not rotate?
(a) Cold conditions on earth’s half portion
(b) Warm conditions on earth’s another half portion
(c) No life possible in such extreme conditions
(d) All of these
Answer
Answer: (d) All of these
Question 8.
A year with 366 days is called
(a) leap year
(b) normal year
(c) both (a) and (b)
(d) none of these
Answer
Answer: (a) leap year
Question 9.
Why do seasons change on the earth?
(a) Due to change in the position of the earth around the sun
(b) Due to no change in the earth’s position
(c) Both (a) and (b)
(d) None of the above
Answer
Answer: (a) Due to change in the position of the earth around the sun
Question 10.
When do the longest day and the shortest night occur in the northern hemisphere?
(a) June 21
(b) September 23
(c) December 22
(d) March 21
Answer
Answer: (a) June 21
Question 11.
In which season Christmas is celebrated in Australia?
(a ) Winter season
(b) Summer season
(c) Autumn season
(d) Spring season
Answer
Answer: (b) Summer season
Question 12.
When do equinoxes occur on the earth?
(a) March 21
(b) September 23
(c) Both (a) and (b)
(d) None of these
Answer
Answer: (c) Both (a) and (b)
Question 13.
Days and nights occur on earth due to
(a) rotation
(b) revolution
(c) both (a) and (b)
(d) none of these
Answer
Answer: (a) rotation
Question 14.
Change of seasons occurs on earth due to
(a) rotation
(b) revolution
(c) both (a) and (b)
(d) none of these
Answer
Answer: (b) revolution