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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 ### 0

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##### Question: 1
When does a foce do work
1-118
When foce acts on the body and body covers some distance in the direction of force then we said force do work
##### Question: 2
How is energy converted from one form to another
2-118
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: 3
Define energy give two types of mechanical energy
3-118
Energy: A body possesses energy if it is carpetable to do work

##### Question: 4
Define potential energy also give its formula
4-118
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: 5
What is meant by effieciency of a system
5-118
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: 6
Define kinetic energy also give its formula
6-118
The energy possessed by a body due to its motion is called kinetic energy
##### Question: 7
Why do we need energy
7-118
Energy: A body possesses energy if it is capable to do work
##### Question: 8
Name the five devices that convert electrical energy into mechanical energy
8-118
The electrical energy is converted into mechanical energy by
Electrical motor
Drill machine
Electric fan
Grinder
Elevator
##### Question: 9
Why fossil fuels are called non-renewable form of energy
9-118
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: 10
How can you find the efficiency of system
10-118
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: 11
What is meant by term power
11-118
The rate of doing work is called power
##### Question: 12
Which form of energy is most preferred and why
12-118
Solar energy is preferred to others.

##### Question: 13
Define Walt
13-118
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: 14
State law of conservation of energy
14-118
Law of Conservation of Energy: Energy can neither be created nor be destroyed but can be converted from one form to another
##### Question: 15
Why output energy is always less than the input energy
15-118
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: 16
Name the device that converts mechanical energy into electrical energy.
16-118
Generator is a device which converts mechanical energy into electrical energy.
##### Question: 17
Define unit of work
17-118
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: 18
Define energy, give two types of mechanical energy.
18-118
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: 19
Give example of the renewable energy source
19-118
Sun light and wither power are renewable energy sources
##### Question: 20
Define elastic potential energy
20-118
The energy possessed due to stretched position in a body is called elastic potential energy. It is stored potential energy in compressed spring
##### Question: 21
What is Magma?
21-118
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: 22
A crate is moved by pulling, with mass the attached to it.
22-118
Given Date: F=100 N
S =10M
##### Question: 23
What are effects of fossil fuels on human health
23-118
It causes serious health problem such as headache, tension, nausea, allergic reaction and irritation of eyes, nose and throat.
##### Question: 24
Define work. What is its SI unit.
24-118
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: 25
Define mechanical energy
25-118
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: 26
State law of conservation of energy.
26-118
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: 27
What is magma
27-118
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: 28
Write down the name of two nuclear reactions
28-118
Fission and fusion are two major reactions which give out nuclear energy
##### Question: 29
What is meant by term power?
29-118
The rate of doing work is called power. P = Work/time
##### Question: 30
Define mechanical energy.
30-118
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: 31
On which parts solar house heating system consist of
31-118
A collector
A storage device
Distribution system
##### Question: 32
What is meant by efficiency of a system?
32-118
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: 33
Write the uses of wind energy
33-118
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: 34
Give purposes of solar panels
34-118
Solar panels can provide power to telephone booths, light house, scientific research centres and satellites.
##### Question: 35
Define Kinetic energy, also give its formula.
35-118
The energy possessed by a body due to its motion is called kinetic energy . Formula: K.E.=1/2 mv2
##### Question: 36
How solar energy can be converted directly into electricity
36-118
Solar energy can be converted directly into electricity by solar cells
##### Question: 37
Define Elastic potential energy.
37-118
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: 38
Write the bigger units of power
38-118
Bigger Units bigger units of power: Bigger of power are kilowatt (kw), megawatt (MW) horse power The relation between them is as follow
##### Question: 39
Define potential energy, also give its formula.
39-118
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: 40
What is photo cell
40-118
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: 41
How solar energy can be converted directly into electricity?
41-118
Solar energy can be converted directly into electricity by solar cells.
##### Question: 42
What are the major sources of energy?
42-118
Major sources of energy are as following .
1-Fossil fuels
2-Nuclear Fuels.
##### Question: 43
Mechanical energy converts into heat energy tive its example.
43-118
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: 44
Define work. Write formula and unit.
44-118
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: 45
Write the bigger units of power.
45-118
Bigger units of power are kilowatt , megawatt, horse power.
##### Question: 46
How nuclear energy is obtained
46-118
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: 47
Define unit of work.
47-118
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: 48
Define Energy
48-118
Energy Ability of a body to do work is called energy
##### Question: 49
Define watt.
49-118
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: 50
What are effects of fossil fuels on human health?
50-118
It causes serious health problem such as headache, tension, nausea, allergic reaction and irritation of eyes. nose and throat.
Prove that
51-118
P=W/t
P=f.s/t
P=F.v
##### Question: 52
When does a force do work? Explain.
52-118
When force acts on the body and body covers some distance in the direction of force then we said force do work.
##### Question: 53
What are solar panels.
53-118
Large number of solar cells are wired together to form solar panels
##### Question: 54
When does a force work
54-118
In physics, work is done when a force acts on a body and moves it in the direction of the force
##### Question: 55
Write names of two non-renewable and renewable sources of energy
55-118
Non renewable sources of energy are
Fossil fuels
Nuclear fuels
Renewable source of energy are
solar energy, Wind energy
##### Question: 56
Define Elastic potential energy and give its example.
56-118
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: 57
How Biomass is used to obtain energy
57-118
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: 58
Why fossil fuels are called non- renewable source of energy?
58-118
Fossil fuels are called non renewable source of energy because they will run out like coal, oil and gas.
##### Question: 59
Differentiate between electrical energy and light
59-118
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: 60
Define gravitational potential energy.
60-118
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: 61
Write uses of energy, pollute our environment?
61-118
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: 62
Give a example of the renewable energy source.
62-118
Sun light and water power are renewable energy source.
##### Question: 63
Give the use of solar cell
63-118
Solar cells are used in calculators watches and toys.
##### Question: 64
What is soil erosion
64-118
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: 65
What is photo cell?
65-118
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: 66
Define Potential energy and write its formula.
66-118
Potential Energy:
The energy possessed by a body due to its position is known as its potential energy P.E = mgh
##### Question: 67
Mechanical energy converts into heat energy give its example
67-118
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: 68
Give the uses of solar cells.
68-118
Solar cells are used in calculators, watches and toys.
##### Question: 69
Define kinetic energy and write tis equation
69-118
Kinetic energy: The energy possessed by a body due to its motion is called its kinetic energy
Education K.E=1/2
##### Question: 70
Write down the name of two nuclear reactions.
70-118
Fission and Fusion are two major reactions which give out nuclear energy.
##### Question: 71
Mechanical energy can be converted in heat energy
71-118
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: 72
Differentiate between solar cell and solar penal
72-118
Solar Cell: Solar cell is made up from silicon water
Solar cells are used in calculators watches and toys.
##### Question: 73
What is meant by chemical energy
73-118
Chemical Energy: The energy released from substances during chemical reactions is called chemical energy
##### Question: 74
How much power is used by a 40Kg athleteby climbing 10m high ladder in 10s
74-118
m = 40 kg
t = 10s
h=S = 10m
F= w
F= mg
F= 4 x 10
F= 400N
##### Question: 75
Define mechanical energy and write its types
75-118
Mechanical energy: The energy possessed by a body both due to its motion or position is called mechanical energy

##### Question: 76
What is meant by bio mass energy?
76-118
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: 77
What is meant by bio mass energy
77-118
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: 78
Differcreate between Mechanical energy and Sound energy
78-118
Mechanical Energy: energy possessed by a body due to its motion or change in position is called mechanical energy

##### Question: 79
Define Work and Joule
79-118
Work: Work is done when a force acting on a acting on a body displace it in the direction of a force
##### Question: 80
Define kinetic EnergyWrite its equation
80-118
Kinetic Energy:
The energy possessed by a body due to its motion is called its kinetic energy.
K.E =1/2 mv²
##### Question: 81
What are solar panels
81-118
Large number of solar cells are wired together to form solar panels
##### Question: 82
What is meant by Geothermal energy
82-118
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: 83
Define power and watt
83-118
Power: The rate of doing work
##### Question: 84
Write equation for K.E and P.E
84-118
Kinetic energy: K.E 1/2
Where m is mass and v is velocity of body
##### Question: 85
Define chemical energy and write one method to obtain it
85-118
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: 86
Write names of two renewable energy sources
86-118
Name of renewable energy sources are
Energy from water, Energy from the sun, Biomass, Wind energy, Geothermal energy sources.
##### Question: 87
Write down the two disadvantages of fossil fuels
87-118
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: 88
Write brief note on Einstein mass energy equation
88-118
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: 89
How a pole vaulter acquired changes of energy?
89-118
Pole culture is capableto store all the vaulter's Kinetic energy while bending in the form of potential energy.
##### Question: 90
How is energy produced from nuclear fuels
90-118
The energy is produces from nuclear fuels by nuclear reactions such as fission and fusion reactions.
##### Question: 91
Where and why catalytic converter is to be used
91-118
New cars have catalytic converters, These devices convert some polluting gases.
##### Question: 92
Name the five devices that convert electrical energy into mechanical energy.

92-118
1- Electric Motor
2- Electric Fan
3- Elevator
4- Drill machine
5- Grinder Sewing machine
##### Question: 93
Name such a device that converts mechanical energy into electrical energy
93-118
Generator is a device that converts mechanical energy into electrical energy
##### Question: 94
On what parts a heating system consist of
94-118
A heating system consists of the following factors
A collector, A storage device, A distribution system
##### Question: 95
A body of mass 50 kg is raised to a height of 3m what is its potential energy?
95-118
m= 50kg
h = 3m
P.E = Mgh
= 3 x10 x 50
P.E = 1500
##### Question: 96
Write the mass energy equation and value of speed of light
96-118
Mass Energy Equation: The Einstein's mass-energy equation states that mass and energy are interconvertible to each other
##### Question: 97
Define work and energy
97-118
Work: Work is said to be done when force acting on a body displaces it in the direction of the force.
##### Question: 98
How much work is done when a body moves with uniform velocity?
98-118
When a body moves with uniform velocity means moving with zero acceleration then work done will be zero
##### Question: 99
What is meant by Energy from Biomass
99-118
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: 100
Define fission reaction
100-118
Fission reaction: Nuclear fussion is the process in which a large nucleus splits into smaller nuclei with the release of energy
##### Question: 101
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?
101-118
W= 12J
E= 100 J
Efficiency = 12J/100J
= 0.12
% Efficiency = 0.12 x100
= 12%
##### Question: 102
What two sources of non-renewable energy
102-118
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: 103
Name two devices that convert electrical energy into mechanical energy
103-118
D.C motor and Electrical fane are those devices which convert electrical energy into mechanical energy
##### Question: 104
On which factor work depends
104-118
Work: Work is done when a force acting on a body displaces in the direction of force
Formula: it is a scalar quantity
##### Question: 105
Write the names of major sources of Energy
105-118
Major Source of Energy
Fossil fuels, Nuclear fuels, Sun, Water

##### Question: 106
Write two disadvantages of thermal pollution
106-118
Thermal pollution upsets the balance of lift
Thermal pollution endanger the survival of many species.
##### Question: 107
Define potential energy and write its formula
107-118
Potential energy: The energy possessed by a bogy due to tis position is known as its potential energy
##### Question: 108
What is difference between kinetic Energy and potential Energy
108-118
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: 109
Define geothermal energy and elastic potential energy
109-118
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: 110
Differentiate between mechanical and chemical energy
110-118
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: 111
Define heat energy
111-118
Heat Energy: A form of energy given out by hot bodies is called heat energy
##### Question: 112
How do we gain energy from air
112-118
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: 113
Write two uses of wind energy
113-118
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: 114
What is meant by Nuclear Energy
114-118
Nuclear Energy: Energy released in various nuclear reactions like fission and fusion reaction is called nuclear energy
##### Question: 115
Write down two ases of thermal pollution.
115-118
Global warming is the major causes of thermal pollution. The heat produced bby fission reaction causes thermal polution.
##### Question: 116
Define efficiency and write its equation
116-118
Efficiency: Efficiency of a system is the ratio of required form of energy obtained from a system as output to the total energy give to it as input
##### Question: 117
What is the second name of solar cell and how it made