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1
The point in the orbit of a planet nearest to the sun is called ________________________.
Perihelion
Aphelion.
Phelion.
None of these.
2
Gravitational Force is an example of _________________.
Contact Force
Non Contact Force
Chemical Force
None of these
3
What is the SI unit of weight ?
Kilogram
Newton
Newton/metre
Gram
4
Kepler’s Second Law states that an imaginary line from the sun to the planet sweeps out equal areas in _______________ intervals of time.
Unequal
Equal
Both (a) and (b) are correct.
5
It has been observed that an object dropped from a height falls towards the Earth because of ________________
Electrostatic Force
Gravitational Force
6
The gravitational force of attraction between any two particles in the universe is _____________________ proportional to the product of the masses of the particles.
Directly
Inversely
7
___________________ of an object is the force with which it is attracted towards the Earth.
Mass
Weight
Force
8
The force of _____________________ between two objects is called the force of gravitation or gravitational force.
Attraction
Repulsion
9
Weight is a _______________ quantity and in the space, where g = 0, weight of an object is ________________.
Vector , zero.
Scalar, zero.
Scalar, infinity.
Vector , infinity.
10
Which of the following is incorrect:
1. It has been observed that an object dropped from a height falls towards the Earth i.e. earth pulls everything towards itself.
2. Newton generalized this idea and said that not only earth but every object in the universe attracts every other body.
Only 1
Only 2
Both 1 and 2
11
Which of the following are correct :
(a) The motion of the moon around the earth is due to centripetal force provided by the force of attraction of the Earth.
(b) Planets around the sun is due to centripetal force.
Only (a) is correct.
Only (b) is correct.
12
(a) The mass of the body can be zero.
(b) The mass of the body cannot be zero.
13
Which of the following statements are correct:
1. Gravitational force is defined as the non contact force of attraction between any two bodies in the universe.
2. The earth attracts (or pulls) all objects lying on or near its surface towards its centre.
14
(a) The force of attraction was first observed by Sir Isaac Newton
(b) The force of attraction between two objects is called the force of gravitation or gravitational force.
(c) If a body(ball) is thrown upwards, it reaches a certain height and falls downwards because of the frictional force of the earth.
Only (a) and (b) are correct.
Only (b) and (c) are correct.
Only (a) and (c) are correct.
All of these
15
(a) The motion of the moon around the earth is due to centrifugal force provided by the force of attraction of the Earth.
(b) Going through aloop on aroller coaster is due to centripetal force.
(c) The motion of the moon around the earth is due to centripetal force provided by the force of attraction of the Earth.