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
Unit of workdone is

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

Question-2
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-3
1 kilo watt =

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

Question-4
A boy of mass 50 kg runs up staircase of 45 steps in 9 s. If the height of each step is 15 cm, find his power. Take g = 10 m s^-1

(A) 400 W	(B) 275 W
(C) 375 W	(D) 575 W

Question-5
1 hp is equal to

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

Question-6
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-7
A radio set of 60 watts runs for 50 hours.How many 'units ' (kWh) of electrical energy is consumed ?

(A) 6 kWh	(B) 4 kWh
(C) 3 kWh	(D) 30 kWh

Question-8
Which is the correct expression for potential energy of an object?

(A) mgh	(B) 1/2 mv²
(C) 2mgh	(D) mgh²

Question-9
A person pulls a body on a horizontal surface by applying a force of 5.0 N at an angle of 30⁰ with the horizontal.Find the workdone by this force in displacing the body through 2.0 m?

(A) 5√3 J	(B) 6√2 J
(C) 7√3 J	(D) 4√3 J

Question-10
The energy used in households, industries and commercial establishments are usually expressed in

(A) Joule	(B) Watt
(C) Kilowatt - hour	(D) Volt

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Std 9

Tamil Nadu (English Medium)

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