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
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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
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.
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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
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
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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
9.
10.
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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
11.
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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
12.
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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
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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
13.
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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