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Physics 9 Chapter 6 - Work and Energy - 23
1.
What is ‘c’ in E = mc
2
?
a) Speed of sound
b) Speed of electron
c) Speed of earth
d) Speed of light
2.
What is the value of ‘c’?
a) 3x10
11
ms
-1
b) 3x10
12
ms
-1
c) 3x10
9
ms
-1
d) 3x10
8
ms
-1
3.
In Einstein’s mass-energy equation, ‘c’ is the...................?
a) Speed of sound
b) Speed of electron
c) Speed of earth
d) Speed of light
4.
What is the speed of light?
a) 3x10
12
ms
-1
b) 3x10
8
ms
-1
c) 3x10
9
ms
-1
d) 3x10
11
ms
-1
5.
On which of the following, the process of getting energy from our nuclear power plants is based?
a) Newton’s mass-work equation
b) Einstein’s mass-energy equation
c) Einstein’s mass-work equation
d) Newton’s mass-energy equation
6.
From which of the following, most of the electricity is obtained?
a) Coal
b) All of these
c) Gas
d) Oil
7.
Which energy, of a steam produced in a boiler, is used to turn a turbine?
a) Geothermal energy
b) Potential energy
c) Thermal energy
d) Electrical energy
8.
Which energy from turbines is used to run an electric generator?
a) Electrical energy
b) Geothermal energy
c) Mechanical energy
d) Thermal energy
9.
What is the change in the quality of environment that can be harmful and unpleasant for living things?
a) Oxidation
b) Pollution
c) Reduction
d) None of these
10.
On which of the following equations, the process of getting energy from our nuclear power plants is based?
a) E = mc
3
b) E = mc
2
c) E = mc
-2
d) E = mc
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