Class-9,Work and Energy

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Name of Student *

Contact No. *

Q1) Work done by centripetal force is *

1 point

Zero

greater than 0

one

less than 0

Q2) 9800 joule of energy was spent to raise a mass of 50kg, the mass was raised to a height of (take g = 9.8 m/s2) *

1 point

10m

980m

20m

80 m

Q3) A machine does 2000 joule of work in 400 seconds. What is the power of machine? *

1 point

0.5w

20w

Q4) Calculate the time taken by a 150 w bulb of consuming 3000 joule of energy. *

1 point

20s

30 s

40 s

25 s

Q5) What is the force required to lift a block of mass 2m? *

1 point

3/2mg

mg/2

2mg

Q6) Statement A: Work is said to be done when a camel is carrying a load on its back Statement B: Work is said to be done when a sailboat is moving due to wind energy Which of the above statement is true? *

1 point

statement A and B

statement A

neither A nor B

statement B

Q7) 1 W. S = ________? *

1 point

1 joule

10 joule

2 joule

5 joule

Q8) *

1 point

16535J

16537J

155874 J

15637J

Q9) *

1 point

200w

20w

40w

400w

Q10) For what value of θ is work done maximum? *

1 point

Option 1

Option 2

Option 3

Option 4

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