Tamil Nadu (English Medium) Std 9 Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in


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Question-1
What is the velocity of a body of mass 100 g having a K.E. of 20 J?

(A) 2 m s^-1	(B) 20 m s^-1
(C) 40 m s^-1	(D) 400 m/s

Question-2
1 kWh =

(A) 3.6 x 106 Js	(B) 3.6 x 105 Js
(C) 3.6 x 109 Js	(D) 3.6 x 10-6 Js

Question-3
1 kilo watt =

(A) 10 watts	(B) 100 watts
(C) 500 watts	(D) 1000 watts

Question-4
A force of 7N acts on an object. The displacement is 8m in the direction of force. What is the work done?

(A) 24 J	(B) 56 J
(C) 54 J	(D) 64 J

Question-5
The energy possessed by a body due to its motion is called

(A) Kinetic energy	(B) Potential energy
(C) Static energy	(D) Mechanical energy

Question-6
Which is the correct expression for potential energy of an object?

(A) mgh	(B) 1/2 mv²
(C) 2mgh	(D) mgh²

Question-7
Unit of workdone is

(A) Newton(N)	(B) Watt(W)
(C) Joule(J)	(D) Pascal

Question-8
1 hp is equal to

(A) 0.746 kW	(B) 7.46 kW
(C) 74.6 kW	(D) 746 kW

Question-9
Find the energy possessed by an object of mass 10 kg when it is at a height of 6 m above the ground.Given,g = 9.8 m / s²

(A) 588 J	(B) 688 J
(C) 858 J	(D) 600 J

Question-10
A porter lifts a luggage of 15 kg from the ground and pats it on his head 1.5 m above the ground. Calculate the work done by him on the luggage.

(A) 250 J	(B) 235 J
(C) 225 J	(D) 215 J

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Std 9

Tamil Nadu (English Medium)

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