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physics-9-chapter-4-turning-effect-of-force-1
1.
Who was the first man to come up the idea of gravity?
a) Isaac Newton
b) Albert Einstein
c) James Watson
d) Francis Crick
2.
When Isaac Newton was trying to solve the mystery why planets revolve around the Sun?
a) 1665
b) 1965
c) 1765
d) 1565
e) 1695
3.
When Isaac Newton was trying to solve the mystery why planets revolve around the Sun, what fall from the tree under which he was sitting?
a) n apple
b) A mango
c) A banana
d) A pineapple
4.
Which idea was flashed in the mind of Newton when he saw an apple falling from the tree?
a) Idea of gravity
b) Idea of acceleration
c) Idea of speed
d) Idea of distance
5.
Who concluded that the force which causes an apple to fall on the Earth and the force which keeps the moon in its orbit are of the same nature?
a) saac Newton
b) Albert Einstein
c) James Watson
d) Francis Crick
6.
What is the force called with which everybody attracts every other body in this earth?
a) Force of gravitation
b) Force of inertia
c) Force of momentum
d) Force of friction
7.
Who called the force with which everybody attracts every other body in this earth as force of gravitation?
a) Isaac Newton
b) Albert Einstein
c) James Watson
d) Francis Crick
8.
Which law of Newton states that: “Everybody in universe attracts every other body with force which is directly proportional to product of their masses and inversely proportional to square of distance between their centres”?
a) Newton’s law of gravitation
b) Newton’s first law of motion
c) Newton’s second law of motion
d) Newton’s third law of motion
9.
Which of the following is CORRECT about force of gravitation?
a) Force is inversely proportional to the square of distance between centres of masses
b) Force is inversely proportional to the product of masses
c) Force is directly proportional to the sum of masses
d) Force is inversely proportional to the sum of masses
10.
Which of the following is directly proportional to the force of gravitation?
a) The product of masses
b) The sum of masses
c) The product of distance between centres of masses
d) The sum of distance between centres of masses
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