Physics class ix notes 9th class board pattern model paper
Physics Chapter No-06 Important questions, if you attempt these question you will get InshaAllah 100% marks.
(Chapter-06) Important MCQs
Choose the right
option.
10×1=10
A
|
B
|
C
|
D
|
||
1
|
The work done in
lifting a brick of a mass 2 kg through a height of 5m above ground will be:
|
2.5J
|
10J
|
50J
|
100J
|
2
|
Fossil fuels are
usually compounds of:
|
Carbon
|
Hydrogen
|
Carbon and hydrogen
|
Carbon and nitrogen
|
3
|
In nuclear power
plants, we get energy as a result of:
|
Fission reaction
|
Fusion reaction
|
Chemical reaction
|
Nuclear reaction
|
4
|
One kilo joule is
equal to:
|
102J
|
103J
|
105J
|
106J
|
5
|
A solar house
heating system consists of:
|
A collector
|
A storage device
|
A distribution
system
|
All of these
|
6
|
In the United
States, some wind farms in a day generate electricity upto:
|
1000MW
|
1100MW
|
1200MW
|
1300MW
|
7
|
Speed of light is:
|
3×104ms-1
|
3×106ms-1
|
3×108ms-1
|
3×108ms
|
8
|
The energy
possessed by a body due to its motion is called
|
Kinetic energy
|
Potential energy
|
Gravitational
energy
|
Elastic potential
energy
|
9
|
Rate of doing work
is called:
|
Energy
|
Torque
|
Power
|
Momentum
|
10
|
Unit of power is
|
Joule
|
Newton
|
Nm
|
Watt
|
Subjective
Answer
the following short questions.
10×2=20
1. Define
work and also define its unit.
2. A
body of mass 50kg is raised to a height of 30m. What is its potential energy?
(g= 10ms-2)
3. Write
a short note on nuclear energy?
4. Define efficiency. How we can find out the percentage efficiency?
5. Why
fossil fuels are called non-renewable form of energy? Also give its examples.
6. Which
form of energy is most preferred and why?
7. What
do you mean by an ideal system?
8. What
is meant by the term power? Write its formula, its unit and its bigger units.
9. How
can we produce energy from a biomass?
10. What
is meant by interconversion of energy?
Long Questions 5×1=5
1. (a)
Write a note on solar cell and fossil fuels.
3
(b) A motor boat moves at a steady speed
of 4ms-1. Water resistance acting on it is 4000N. Calculate the
power of its engine?
2
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