Work And Energy Class 9 Chapter 2 MCQ
Maharashtra State Board
Class: 9 #MCQ
|
1 |
Water stored in a dam possess? |
|
A |
No energy |
|
B |
Potential energy |
|
C |
Kinetic energy |
|
D |
Electrical energy |
|
ANS |
Potential energy |
|
2 |
When a body falls freely towards the earth then the total energy? |
|
A |
Remain constant |
|
B |
Increase |
|
C |
Decrease |
|
D |
First increase and then decrease |
|
ANS |
Remain constant |
|
3 |
Power of women is equal to? |
|
A |
Work/time |
|
B |
Work/time |
|
C |
work |
|
D |
Time/work |
|
ANS |
Work/time |
|
4 |
A spring is compress The P.E of the compressed spring? |
|
A |
Increase |
|
B |
Becomes zero |
|
C |
Remains unchanged |
|
D |
Decrease |
|
ANS |
Decrease |
|
5 |
A child on a skateboard is moving at a speed of 2 m/s. after a
force acts on the child, her speed is 3 m/s. what can you say about the work
done by the external force on the child? |
|
A |
Zero work was done |
|
B |
Negative work was done |
|
C |
Positive work was done |
|
D |
Infinite work was done |
|
ANS |
Positive work was done |
|
6 |
When force acts in opposite direction the work done is? |
|
A |
Negative |
|
B |
Positive |
|
C |
Infinity |
|
D |
Zero |
|
ANS |
Negative |
|
7 |
When a spring is compressed work is done on it. Its elastic
potential energy? |
|
A |
Increases |
|
B |
Decreases |
|
C |
Disappears |
|
D |
Dose not change |
|
ANS |
Decreases |
|
8 |
When a body rolls down an inclined plane, then it has? |
|
A |
It has no energy |
|
B |
Only kinetic energy |
|
C |
It has potential energy |
|
D |
Both kinetic and potential energy |
|
ANS |
Both kinetic and potential energy |
|
9 |
On a rough surface a mass is (a) pulled, (b) pushed by a force
acting at an angle with the surface? |
|
A |
Pulling is easier |
|
B |
Pushing is easier |
|
C |
Pushing and pulling both are easier |
|
D |
Pushing and pulling both are not easier |
|
ANS |
Pulling is easier |
|
10 |
A stone rubbed on a rough surface and placed on the skin will
show heating sensation, because? |
|
A |
Friction causes heat |
|
B |
Heat cannot flow from the skin to |
|
C |
Heat flows from the stone to skin |
|
D |
Heat cannot flow |
|
ANS |
Friction causes heat |
|
11 |
Work done by a body from force-distance curve is? |
|
A |
Area under the curve |
|
B |
Slope of the curve |
|
C |
Line parallel to the distance axis |
|
D |
Line parallel to the force axis |
|
ANS |
Area under the curve |
|
12 |
In the SI system, the unit of potential energy is? |
|
A |
Newton |
|
B |
Joule |
|
C |
Watt |
|
D |
Metre per second |
|
ANS |
Joule |
|
13 |
What is the commercial unit of energy? |
|
A |
Electron volt |
|
B |
w/s |
|
C |
kw h |
|
D |
Joule |
|
ANS |
Kw h |
|
14 |
9800 joule of energy was spent to raise a mass of 50kg, the mass
was raised to a height of? |
|
A |
20m |
|
B |
980m |
|
C |
10m |
|
D |
None of these |
|
ANS |
20m |
|
15 |
SI unit of power is? |
|
A |
Watt |
|
B |
Joule |
|
C |
Newton |
|
D |
Meter |
|
ANS |
Watt |
|
16 |
Work done by a body is? |
|
A |
Negative, positive or zero |
|
B |
Always positive |
|
C |
Always zero |
|
D |
Always negative |
|
ANS |
Negative, positive or zero |
|
17 |
A body is falling from a height h. after it has fallen a height
h/2, it will possess? |
|
A |
Only potential energy |
|
B |
Only kinetic energy |
|
C |
Half potential and half kinetic energy |
|
D |
More kinetic and less potential energy |
|
ANS |
Half Potential and half kinetic energy |
|
18 |
If speed of a car becomes 2 times, its kinetic energy becomes? |
|
A |
4 times |
|
B |
8 times |
|
C |
16 times |
|
D |
12 times |
|
ANS |
4 times |
|
19 |
The form of energy possessed by a flying bird is? |
|
A |
Kinetic energy |
|
B |
Potential energy |
|
C |
Both kinetic and potential energy |
|
D |
Can’t say |
|
ANS |
Both kinetic and potential energy |
|
20 |
Work done by the gravitational force of earth on a satellite
along a circular path? |
|
A |
0 |
|
B |
Minimum |
|
C |
Max |
|
D |
All of these |
|
ANS |
0 |
|
21 |
The formula to find the work done is? |
|
A |
W = F+S |
|
B |
W = F.S |
|
C |
W = F-S |
|
D |
W = F/S |
|
ANS |
W = F.S |
|
22 |
If a force acting on a body causes no displacement, the work done
is ---------? |
|
A |
-1 |
|
B |
1 |
|
C |
0 |
|
D |
Infinity |
|
ANS |
0 |
|
23 |
Objects in motion possess energy and can do work; this energy is
called---------? |
|
A |
Solar energy |
|
B |
Thermal energy |
|
C |
Potential energy |
|
D |
Kinetic energy |
|
ANS |
Kinetic energy |
|
24 |
The sum of kinetic energy and potential energy is ---------? |
|
A |
Mechanical energy |
|
B |
Thermal energy |
|
C |
Potential energy |
|
D |
Kinetic energy |
|
ANS |
Mechanical energy |
|
25 |
1 kilowatt =? |
|
A |
1 watt |
|
B |
10 watt |
|
C |
100 watt |
|
D |
1000 watt |
|
ANS |
1000 watt |
|
26 |
The energy used in one hour at the rate of 1 kw is known as
--------? |
|
A |
10 kwh |
|
B |
1 kwh |
|
C |
1 w |
|
D |
1 kw/h |
|
ANS |
1 kwh |
|
27 |
What are the various factors affecting kinetic energy? |
|
A |
Mass |
|
B |
Momentum |
|
C |
Velocity |
|
D |
All the above options |
|
ANS |
All the above options |
|
28 |
When two identical bodies are in motion, the body with a higher
velocity has-----------? |
|
A |
Lower kinetic energy |
|
B |
Higher kinetic energy |
|
C |
No kinetic energy |
|
D |
None of the options |
|
ANS |
Higher kinetic energy |
|
29 |
If the displacement is perpendicular to the force, then the work
done is said to be ---------? |
|
A |
-1 |
|
B |
1 |
|
C |
0 |
|
D |
Infinity |
|
ANS |
0 |
0 Comments