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# 9th Class Chapter 6 Physics Short Questions

An important facility for 9th class students preparing for short questions physics 9th class chapter 6 of BISE. Get hundreds of questions to prepare and get better marks in 9th physics

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##### Question: 1
Define gravitational potential energy.
1-118
Gravitational potential energy possessed due to height of the body is called gravitational potential energy. G.P.E.= mgh Example: The energy store in dam water.
##### Question: 2
Define watt.
2-118
The SI unit of power is watt, One watt is power of a device which does 1 J of work in 1 sec. 1 Watt = 1 Js-1
##### Question: 3
Define Elastic potential energy.
3-118
Elastic potential energy: The energy possessed due to stretched position in a body is called elastic potential energy. It is stored potential energy in compressed spring.
##### Question: 4
Define work. What is its SI unit.
4-118
Work: work is done when a force acting on a body displaces it in the direction it in the direction of force. W = Force x displacement w= F.S Unit: Its unit is newton meter or joule.
##### Question: 5
Define potential energy, also give its formula.
5-118
The energy possessed by a body due to to position is called potential energy. There are two type of potential energy. . Formula: P.E. = mgh i. Elastic potential energy ii.Gravitational potential energy.
##### Question: 6
Define unit of work.
6-118
Unit of work is joule. Amount of work is one joule when a force of one newton displaces a body through one meter in the direction of force. 1 J = 1 Nm
##### Question: 7
Define energy, give two types of mechanical energy.
7-118
A body possess energy if it is capable to do work. Unit: Its unit is joule Quantity: It is scalar quantity Types of mechanical energy: i. Kinetic energy ii. Potential energy
##### Question: 8
Define Kinetic energy, also give its formula.
8-118
The energy possessed by a body due to its motion is called kinetic energy . Formula: K.E.=1/2 mv2
##### Question: 9
What is meant by efficiency of a system?
9-118
Efficiency of a system is the ratio of required form of energy obtained from a system as output to the total energy given to it as input. Formula: Efficiency = Required form of output/total input energy
##### Question: 10
Name the device that converts mechanical energy into electrical energy.
10-118
Generator is a device which converts mechanical energy into electrical energy.
##### Question: 11
What is meant by term power?
11-118
The rate of doing work is called power. P = Work/time
##### Question: 12
What is meant by bio mass energy?
12-118
Biomass is plant or animal wastes that can be that can be burnt as fuel. Other forms of biomass are garbage, farm wastes, sugarcane and other plants. The energy obtained from biomass is called biomass energy.
##### Question: 13
When does a force do work? Explain.
13-118
When force acts on the body and body covers some distance in the direction of force then we said force do work.
##### Question: 14
What is photo cell?
14-118
A solar cell also called photo cell is made from silicon wafer. When sunlight falls on a solar cell. It converts the light directly into electrical energy.
##### Question: 15
What are solar panels.
15-118
Large number of solar cells are wired together to form solar panels
##### Question: 16
Define mechanical energy.
16-118
Energy in required form obtained from a working system is always less than the energy give to it as input. Because every system meet energy losses due to friction in the form of heat, noise etc.
##### Question: 17
Define work. Write formula and unit.
17-118
Work:
Work is done when a force acting on a body displaces it in the direction of a force
Work done = force x displacement
W= FS
##### Question: 18
Give a example of the renewable energy source.
18-118
Sun light and water power are renewable energy source.
##### Question: 19
Name the five devices that convert electrical energy into mechanical energy.

19-118
1- Electric Motor
2- Electric Fan
3- Elevator
4- Drill machine
5- Grinder Sewing machine
##### Question: 20
How a pole vaulter acquired changes of energy?
20-118
Pole culture is capableto store all the vaulter's Kinetic energy while bending in the form of potential energy.
##### Question: 21
Give the uses of solar cells.
21-118
Solar cells are used in calculators, watches and toys.
##### Question: 22
Define Elastic potential energy and give its example.
22-118
Elastic Potential Energy:
The energy present in the stretchedbow is called elastic potential energy. A stretchedbow has potential energy due to its stretched position
##### Question: 23
Define potential energy also give its formula
23-118
Potential Energy: The energy possessed by a body to do work due to position is called potential energy There are two type of potential energy
##### Question: 24
State law of conservation of energy.
24-118
Energy can neither be created nor be destroyed but can be converted from one form in another . Example; When we rub our band our muscular energy converts into heat energy.
##### Question: 25
Why fossil fuels are called non- renewable source of energy?
25-118
Fossil fuels are called non renewable source of energy because they will run out like coal, oil and gas.
##### Question: 26
Which form of energy is most preferred and why
26-118
Solar energy is preferred to others.

##### Question: 27
What are effects of fossil fuels on human health?
27-118
It causes serious health problem such as headache, tension, nausea, allergic reaction and irritation of eyes. nose and throat.
##### Question: 28
Why output energy is always less than the input energy
28-118
The energy in required form obtained from a working system is always less than the energy given to it us input Because every system meet energy losses due to friction in the form of heat noise etc
##### Question: 29
Write the bigger units of power.
29-118
Bigger units of power are kilowatt , megawatt, horse power.
##### Question: 30
What are the major sources of energy?
30-118
Major sources of energy are as following .
1-Fossil fuels
2-Nuclear Fuels.
##### Question: 31
What is Magma?
31-118
In some parts of world,the Earth provided us hot water from geyser& hot spring there is hot molten part, deep in earth called magma.
##### Question: 32
When does a foce do work
32-118
When foce acts on the body and body covers some distance in the direction of force then we said force do work
##### Question: 33
How solar energy can be converted directly into electricity?
33-118
Solar energy can be converted directly into electricity by solar cells.
##### Question: 34
Write uses of energy, pollute our environment?
34-118
Burning of fuel and solid wastes in homes, automobiles and factories release harmful amounts of air pollutants
2- Nuclear power plants do not produce carbon dioxide, but they produce dangerous radioactive waste
##### Question: 35
Write down the name of two nuclear reactions
35-118
Fission and fusion are two major reactions which give out nuclear energy
##### Question: 36
Write down the name of two nuclear reactions.
36-118
Fission and Fusion are two major reactions which give out nuclear energy.
##### Question: 37
A cyclist does 12 joules of useful work while pedaling his bike from every 100 joules of food energy which he takes. What is his efficiency?
37-118
W= 12J
E= 100 J
Efficiency = 12J/100J
= 0.12
% Efficiency = 0.12 x100
= 12%
##### Question: 38
What is photo cell
38-118
A solar cell also called photo cell is made from silicon wafer. When sunlight falls on a solar cell it converts the light directly into electrical energy.
##### Question: 39
Mechanical energy converts into heat energy tive its example.
39-118
Mechanical energy converts into heat energy. Example: Rub your hands together quickly . You will feel them warm. You have used your muscular energy in rubbing hands as a result heat is produced.
##### Question: 40
How much work is done when a body moves with uniform velocity?
40-118
When a body moves with uniform velocity means moving with zero acceleration then work done will be zero
##### Question: 41
How is energy converted from one form to another
41-118
Energy can be converted from one from to another form For example heat energy is converted into mechanical energy and electrical energy can be converted into light energy
##### Question: 42
How can you find the efficiency of system
42-118
Efficiency of a system is the ratio of required form of energy obtained from a system as output to the total energy given to it as input
We can find the efficiency of a system by following formula
##### Question: 43
Define Potential energy and write its formula.
43-118
Potential Energy:
The energy possessed by a body due to its position is known as its potential energy P.E = mgh
##### Question: 44
When does a force work
44-118
In physics, work is done when a force acts on a body and moves it in the direction of the force
##### Question: 45
How much power is used by a 40Kg athleteby climbing 10m high ladder in 10s
45-118
m = 40 kg
t = 10s
h=S = 10m
F= w
F= mg
F= 4 x 10
F= 400N
##### Question: 46
Define Walt
46-118
Walt The SI unit of power is Walt One Watt is power of a device which does 1 j of work in 1 sec
##### Question: 47
Define kinetic EnergyWrite its equation
47-118
Kinetic Energy:
The energy possessed by a body due to its motion is called its kinetic energy.
K.E =1/2 mv²
##### Question: 48
What is meant by term power
48-118
The rate of doing work is called power
##### Question: 49
Mechanical energy can be converted in heat energy
49-118
Explain with an example: By rubbing hands quickly these will be warmed Its means b rubbing hand muscular energy is used and as a result heat is produced, In this process of rubbing hands mechanical energy is converted into heat energy
##### Question: 50
What are solar panels
50-118
Large number of solar cells are wired together to form solar panels
##### Question: 51
Define energy give two types of mechanical energy
51-118
Energy: A body possesses energy if it is carpetable to do work

##### Question: 52
A body of mass 50 kg is raised to a height of 3m what is its potential energy?
52-118
m= 50kg
h = 3m
P.E = Mgh
= 3 x10 x 50
P.E = 1500
##### Question: 53
State law of conservation of energy
53-118
Law of Conservation of Energy: Energy can neither be created nor be destroyed but can be converted from one form to another
##### Question: 54
What is meant by Geothermal energy
54-118
Geothermal energy: In some part of word the Earth provides us hot water from geysers and hot springs There is hot molten part deep in the Earth is called magma. Water reaching close to the magma changes to steam due to high temperature of megma This energy is called geothermal energy
##### Question: 55
Why do we need energy
55-118
Energy: A body possesses energy if it is capable to do work
##### Question: 56
On which factor work depends
56-118
Work: Work is done when a force acting on a body displaces in the direction of force
Formula: it is a scalar quantity
##### Question: 57
On which parts solar house heating system consist of
57-118
A collector
A storage device
Distribution system
##### Question: 58
What is magma
58-118
Magma In some parts of world, the Earth provided us hot water from geyser hot spring There is hot molten part deep in earth called magma.
##### Question: 59
Where and why catalytic converter is to be used
59-118
New cars have catalytic converters, These devices convert some polluting gases.
##### Question: 60
Define kinetic energy also give its formula
60-118
The energy possessed by a body due to its motion is called kinetic energy
##### Question: 61
Define heat energy
61-118
Heat Energy: A form of energy given out by hot bodies is called heat energy
##### Question: 62
Name the five devices that convert electrical energy into mechanical energy
62-118
The electrical energy is converted into mechanical energy by
Electrical motor
Drill machine
Electric fan
Grinder
Elevator
##### Question: 63
Write the uses of wind energy
63-118
Use of Wind Energy: Wind energy is used as a source of energy for centuries
It has been used by windmills to grind grain and pump water It is also used to turn wind turbines.
##### Question: 64
Define unit of work
64-118
Unit of work is joule (J)
Amount of work is one joule when a force of one newton displace a body through one meter in the direction of force
##### Question: 65
Write down two ases of thermal pollution.
65-118
Global warming is the major causes of thermal pollution. The heat produced bby fission reaction causes thermal polution.
##### Question: 66
Give purposes of solar panels
66-118
Solar panels can provide power to telephone booths, light house, scientific research centres and satellites.
##### Question: 67
Why fossil fuels are called non-renewable form of energy
67-118
The fossil fuels are one used to get energy that are consumed completely and these took millions of year for their formation So these are no renewable.
##### Question: 68
A crate is moved by pulling, with mass the attached to it.
68-118
Given Date: F=100 N
S =10M
##### Question: 69
Define Energy
69-118
Energy Ability of a body to do work is called energy
##### Question: 70
To construct such a working system whose efficiency is 100% is impossible Why
70-118
To construct such a working system, whose efficiency is 100% is impossible because every system meets energy losses due to friction that causes heat, noise etc These are not the useful form of energyh and go waste.
##### Question: 71
Mechanical energy converts into heat energy give its example
71-118
Mechanical energy converts into heat energy
Example: Rub your hands together quickly You will feel them warm You have used r muscular energy in rubbing hands as a result heat is produced
##### Question: 72
Define elastic potential energy
72-118
The energy possessed due to stretched position in a body is called elastic potential energy. It is stored potential energy in compressed spring
##### Question: 73
Differentiate between electrical energy and light
73-118
Electrical Energy: Electricity is one of the widely used form of energy
Electrical energy can be supplied through wires easily to any desired place
Electrical energy can get from batteries and electric generators.
##### Question: 74
What is meant by bio mass energy
74-118
Bio Mass: Biomass is plant or animal wastes that can be burnt as fuel Other forms of biomass are garbage, farm wastes, sugarcane and other plants. The energy obtained from biomass is called biomass energy
##### Question: 75
Write equation for K.E and P.E
75-118
Kinetic energy: K.E 1/2
Where m is mass and v is velocity of body
##### Question: 76
Differentiate between solar cell and solar penal
76-118
Solar Cell: Solar cell is made up from silicon water
Solar cells are used in calculators watches and toys.
##### Question: 77
What is meant by effieciency of a system
77-118
Efficiency of a system is the ration of required form of energy obtained from a system as output to the total energy given to it as input
##### Question: 78
Define potential energy and write its formula
78-118
Potential energy: The energy possessed by a bogy due to tis position is known as its potential energy
##### Question: 79
How is energy produced from nuclear fuels
79-118
The energy is produces from nuclear fuels by nuclear reactions such as fission and fusion reactions.
##### Question: 80
What are effects of fossil fuels on human health
80-118
It causes serious health problem such as headache, tension, nausea, allergic reaction and irritation of eyes, nose and throat.
##### Question: 81
What is meant by Energy from Biomass
81-118
Biomass is plant or animal wastes also when animal during dead plants and dead animal decompose, they give off a mixture of methane and carbon dioxide. Electricity can produce by burning methane.
##### Question: 82
Define chemical energy and write one method to obtain it
82-118
Chemical Energy: Energy produce during chemical reactions is called chemical energyMethod to Obtain it: Burning of coal, natural gas and wood in arit is chemical reaction which release energy as heat and light.
##### Question: 83
Differentiate between mechanical and chemical energy
83-118
Mechanical Energy: The energy possessed by a body both due to its motion or position is called mechanical energy moving car wind lifted hammar posses mechanical energy
##### Question: 84
Define power and watt
84-118
Power: The rate of doing work
Prove that
85-118
P=W/t
P=f.s/t
P=F.v
##### Question: 86
Write the bigger units of power
86-118
Bigger Units bigger units of power: Bigger of power are kilowatt (kw), megawatt (MW) horse power The relation between them is as follow
##### Question: 87
What is difference between kinetic Energy and potential Energy
87-118
Kinetic Energy: The energy possessed by a body due to its motion is called its kinetic energy.
Kinetic energy is represented by k.e
##### Question: 88
How solar energy can be converted directly into electricity
88-118
Solar energy can be converted directly into electricity by solar cells
##### Question: 89
Define mechanical energy
89-118
Mechanical Energy: Energy possessed by a body both due to its motion or position is called mechanical energy it has two types
Kinetic energy
Potential energy
##### Question: 90
What is meant by Nuclear Energy
90-118
Nuclear Energy: Energy released in various nuclear reactions like fission and fusion reaction is called nuclear energy
##### Question: 91
How Biomass is used to obtain energy
91-118
There are different ways to get energy from biomass Some of these are as follow
Different forms of biomass are used to run power plants.
Many Industries that use forest products get half of their electricity by burning Burk and other wood wastes electricity by burning Burk and other wood wastes
Plants and animal wastes can be burnt as fuel
##### Question: 92
Write two uses of wind energy
92-118
Uses of wind energy
Wind energy has powered sailing ships across the oceans
Wind energy has been used by windmills to rind grain and pump water
##### Question: 93
Give example of the renewable energy source
93-118
Sun light and wither power are renewable energy sources
##### Question: 94
What is the second name of solar cell and how it made
94-118
A solar cell also called photo cell. Solar cell made from silicon wafer. When sunlight falls on a solar cell, it converts the ight directly into electrical energy Solar cells are soused calculators, watches and toys.
##### Question: 95
Define Work and Joule
95-118
Work: Work is done when a force acting on a acting on a body displace it in the direction of a force
##### Question: 96
Write brief note on Einstein mass energy equation
96-118
Einstein predicted the interconversion of matter and energy. According to him, a loss in the mass of a body provides a lot of energy This happen in the nuclear reaction The reaction between the mass m and energy E is given by Einstein's mass energy equation
The above equation shows that tremendous amount of energy can be obtained from small quantity of matter It happens that matter is a highly concentrated form of energy
##### Question: 97
Write names of two non-renewable and renewable sources of energy
97-118
Non renewable sources of energy are
Fossil fuels
Nuclear fuels
Renewable source of energy are
solar energy, Wind energy
##### Question: 98
Give the use of solar cell
98-118
Solar cells are used in calculators watches and toys.
##### Question: 99
Define mechanical energy and write its types
99-118
Mechanical energy: The energy possessed by a body both due to its motion or position is called mechanical energy

##### Question: 100
Name such a device that converts mechanical energy into electrical energy
100-118
Generator is a device that converts mechanical energy into electrical energy
##### Question: 101
Define fission reaction
101-118
Fission reaction: Nuclear fussion is the process in which a large nucleus splits into smaller nuclei with the release of energy
##### Question: 102
How nuclear energy is obtained
102-118
Nuclear Energy: It is a form of energy which is released from the nucleus due to nuclear reactions such as fission or fusion reactions
##### Question: 103
Define kinetic energy and write tis equation
103-118
Kinetic energy: The energy possessed by a body due to its motion is called its kinetic energy
Education K.E=1/2
##### Question: 104
What two sources of non-renewable energy
104-118
Non-renewable: Those sources of energy which finish with continous use of these source are called source of non-renewable energy
Fossil fuels,Nuclear fuels
##### Question: 105
Define work and energy
105-118
Work: Work is said to be done when force acting on a body displaces it in the direction of the force.
##### Question: 106
Write the names of major sources of Energy
106-118
Major Source of Energy
Fossil fuels, Nuclear fuels, Sun, Water

##### Question: 107
Write down the two disadvantages of fossil fuels
107-118
Fossil fuels release harmful waste products. These wastes include carbon mono-oxide and other harmful gases which pollute the environment
Long espouse of these harmful gases may cause as the mas, lungs, cancer, heart diseases and even damage to bran, nerves and other organs of our body.
This causes serious health problems such as headache, Tension, nausea, allergic reactions, irritation of eyes, nose and throat.
##### Question: 108
What is soil erosion
108-118
As the rain water flows down its kinetic energy changes into thermal energy while parts of the kinetic energy of following water is used to wash away soil particles of rocks known as soil erosion.
##### Question: 109
Name two devices that convert electrical energy into mechanical energy
109-118
D.C motor and Electrical fane are those devices which convert electrical energy into mechanical energy
##### Question: 110
Write the mass energy equation and value of speed of light
110-118
Mass Energy Equation: The Einstein's mass-energy equation states that mass and energy are interconvertible to each other
##### Question: 111
Write two disadvantages of thermal pollution
111-118
Thermal pollution upsets the balance of lift
Thermal pollution endanger the survival of many species.
##### Question: 112
Define geothermal energy and elastic potential energy
112-118
Geothermal Energy: There is hot molton part, deep in the earth called magma water reaching close to the magma charges to steam due to the high temperature of magma This energy is called geothermal energy This energy can be utilized by drilling deep in the earth
##### Question: 113
Differcreate between Mechanical energy and Sound energy
113-118
Mechanical Energy: energy possessed by a body due to its motion or change in position is called mechanical energy

##### Question: 114
What is meant by chemical energy
114-118
Chemical Energy: The energy released from substances during chemical reactions is called chemical energy
##### Question: 115
How do we gain energy from air
115-118
Wind has power sailing ships across the oceans It has been used by windmills to grind grain and puop water Now wind power is used to turn wind turbines. When many wind machines are grouped together on wind forms they generate enough power to operator a power plant
##### Question: 116
On what parts a heating system consist of
116-118
A heating system consists of the following factors
A collector, A storage device, A distribution system
##### Question: 117
Write names of two renewable energy sources