work power energy and measurement techniques

8/2/2019 Work Power Energy and Measurement Techniques

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Grade – 11 PHYSICS

Name: _______________________ Date: __________________

Concepts: Work, Power and Energy / Measurement Techniques

Check Point - Knowledge/Mindfulness/Understanding/Application Max. Marks: 22

Duration: 35 mins

1. A metal sphere of radius r is dropped into a tank of water. As it sinks at speed v, it experiences a dragforce F given by F = krv, where k is a constant.

What are the SI base units of k?

A kg m2

s –1

B kg m –2

s –2

C kg m –1

s –1

D kg m s –2

2. The following physical quantities can be either positive or negative.

s : displacement of a particle along a straight line

θ : temperature on the Celsius scale q : electric charge

V : readings on a digital voltmeter

Which of these quantities are vectors?

A. s, θ, q, V B. s, q, V C. θ, V D. s only

3. What is the ratio 1µm / 1Gm?

A 10 –3 B 10 –9

C 10 –12 D 10 –15

4. To check calculations, the units are put into the following equations together with the numbers. Which

equation must be incorrect?

A. force = 300 J / 6m

B. power = 6000 J × 20 s

C. time = 6 m / 30m s –1

D. velocity = 4 m s –2

× 30 s




Name: _______________________ Date: __________________



Duration: 35 mins

5. A pendulum bob is held stationary by a horizontal force H . The three forces acting on the bob areshown in the diagram.

30 T

H

W

The tension in the string of the pendulum is T . The weight of the pendulum bob is W .

Which statement is correct?

A H = T cos30° B T= H sin30° C W = T cos30° D W = T sin30°

6. A concrete cube of side 0.50 m and uniform density 2.0 x 103 kg m –3 is lifted 3.0 m vertically by a crane.What is the change in the potential energy of the cube?

A 0.75 kJ B 7.4 kJ C 29 kJ D 470 kJ

7.




Name: _______________________ Date: __________________



Duration: 35 mins

8.

An electrical generator is started at time zero. The total electrical energy generated during the

first 5 seconds is shown in the graph.

50

energy / J 40

30

20

10

0 0 1 2 3 4 5

time / s

What is the maximum electrical power generated at any instant during these first 5 seconds?

A 10 W B 13 W C 30 W D 50 W




Name: _______________________ Date: __________________



Duration: 35 mins

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Name: _______________________ Date: __________________



Duration: 35 mins

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Name: _______________________ Date: __________________



Duration: 35 mins

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Name: _______________________ Date: __________________



Duration: 35 mins




Name: _______________________ Date: __________________



Duration: 35 mins

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Name: _______________________ Date: __________________



Duration: 35 mins

work power energy and measurement techniques

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