CBSE - IX

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CBSE - IX Science Solved Questions

Question 1

Work done by force acting on an object is equal to the magnitude of the force multiplied by the displacement of the object in the direction of the force.
A) True
B) False

Question 2

Work done by the electrostatic force on an electron revolving around the nucleus of hydrogen is ____ J.
A) 1.6 × 10-19
B) 1.6
C) 0
D) 2.56 × 10-28

Question 3

A body in motion comes to rest when force is applied on it. The work done by the force on the body is ____.
A) zero
B) positive
C) negative
D) infinite

Question 4

When the pendulum bob is in the mean position, total energy will be minimum.
A) True
B) False

Question 5

Work done by the gravitational pull of the Sun on the Earth is maximum in the month of July.
A) True
B) False

Question 6

Work done by the gravitational force on a body is ____.
A) always positive
B) always negative
C) zero
D) positive, negative or zero

Question 7

Work done by gravitational force in a closed path is zero.
A) True
B) False

Question 8

When a body is brought to a certain height, 'h' from the surface of the earth, the work done by the gravitational force is zero.
A) True
B) False

Question 9

Work done in raising a box on to a platform depends on ____.
A) how fast it is raised
B) strength of the man
C) the height to which it is raised
D) the path through which it is raised

Question 10

Work done in raising a box on a platform depends on the path through which it is raised.
A) True
B) False

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