PHYSICS
1.
The scientist who
proposed the theory of evolution Darwin
2.
According to Kepler
concept the orbit of a planet around the sun is elliptical
3.
Einstein gives a
relation E=mc2
4.
The biggest planet of
the solar system Jupiter
5.
The nearest planet of
the sun is Mercury
6.
Number of satellites
revolving round the Jupiter is 14
7.
One Light year is equal
to 9.3x1015mts or
9.46x1012km
8.
Time taken by the moon
to complete one revolution around the earth is 27.3 days
9.
The earth complete one
revolution around the sun in 365 ¼
days
10.
A satellite revolves around the earth in an orbit.
When will its speed be greatest - it is nearest to the earth.
11.
What will be the weight of a body at equator if
the earth stops rotating - Increase
12.
What is the escape velocity from the earth’s surface? -11.2
km/sec.
13.
What are fundamental units - The units of length time and mass are
said to be fundamental units.
14.
Write any four
vector quantity Velocity,
Acceleration, Momentum, Force
15.
Write any four scalar quantities
Time, Volume, Density,
Distance
16.
The sum of potential energy and kinetic energy is mgh+1/2mv2
17.
The mass of a body is M and its
velocity V, then what will be its kinetic energy 1/2mv2
18.
Which type of energy associated with flowing water kinetic energy.
19.
Which instrument converts hear energy into mechanical energy - Heat engine
20.
Steam engine converts heat energy into Mechanical Energy.
21.
What converts heat energy into mechanical energy - Heat engine.
22.
Newton’s law of attraction is
known as universal law of
gravitation
23.
Where is the value of ‘g’ in zero
- Center of the earth
24.
Newton’s first law
of motion given the definition of Inertia.
25.
Why are the passengers pushed forward when a
moving bus stops suddenly - Due to
inertia of the passengers
26.
Define second law of motion - Rate of change of momentum is directly
proportional to the force.
27.
Momentum is a measure of Quantity of motion.
28.
Momentum is defined by IInd Law of Newton
29.
The product of mass and velocity is called Momentum
30.
Conversation of linear momentum is equivalent to Newton’s 3rd law of
motion
31.
Every action as an equal and opposite reaction is
the IIIrd
Law of Newton.
32.
Rate of change of velocity is called as Acceleration
33.
By which law of motion does swimming become
possible - Third law of motion.’
34.
What is the principle of launching rocket Newton’s Third Law.
35.
How does a freely falling body move towards the earth - With a uniform acceleration
36.
The unit of acceleration m/sec2
37.
Sound is a form of energy
38.
Sound propagates in the
form of longitudinal waves
39.
Velocity of sound is
maximum in metals or solids
40.
Sound does not travel in
vacuum
41.
Velocity of sound is
minimum in gases
42.
The unit of sound is Decible
43.
The number of vibration made by a particle in one second is called Frequency
44.
What range of frequency of sound can be heard by
human ear- 20 - 20000Hz
45.
Light waves are transverse in nature
46.
Give examples for
luminous bodies sund stars, electric bulb, burnig candle etc.,
47.
Give the examples for
non-luminous bodies Earth,moon,
table etc.,
48.
Velocity of light is
least in glasses
49.
Velocity of light is
maximum in vacuum
50.
Speed of light in vacuum
is 3x108 mts/sec
51.
Why does the clear sky look blue - Due
to dispersion light
52.
In the white light spectrum the colour of the lowest region is Red
toppest region Violet
53.
Violet colour of light which travels
through glass with minimum speed
54.
Rainbow is normally formed due to Refraction
of light.
55.
What type of image is formed by a concave mirror small and Virtual
56.
A myopic eye is corrected by the use of a which lens Concave.
57.
Hypermetropia rectified by using of convex lens
58.
Astigmatism for a human eye can be removed Cylindrical lens
59.
Doctor use Concave mirror to examine.
60.
The mirror in the dressing table is Plane.
61.
The lens used in microscope is Convex.
62.
What type of final image is seen in a compound microscope Virtual
& Inverted.
63.
Convex lenses are called convergent
lenses
64.
Concave lenses are known as divergent
lenses
65.
What type of mirror used automobile drivers
use. -
Concave mirror
66.
What type of mirror is used in shaving and
makeup -
Concave mirror
67.
How does Myopia, a defect of eye, can be corrected?
-by using concave lens.
68.
Concave
mirror
will form an image three times that of the object.
69.
Focal length of a convex lens is maximum for red light
70.
The human eye forms the image of an object at its Retina.
71.
A defect in
which part of the human eye causes colour blindness cones
72.
How many images are formed between two plane mirrors Infinity
73.
Power of the lens is measured in Diopters.
74.
What is zoom lens - It is a lens having variable focal length
75.
Steel is used to make permanent
magnets
76.
Soft iron is used to make electro magnets
77.
Led stone is called natural magnet
78.
A bar magnet consists of 2
poles (North and South)
79.
The total number of magnetic lines of fore in a given area is called magnetic flex
80.
The center of a bar magnet’s magnetism is zero
81.
Magnetic flex is measured in the unit of weber
82.
SI unit of intensity of magnetic field is Ampere/meter
83.
The unit of Intensity of magnetic field is called Gauss.
84.
What is the sure test of magnetism of two magnets? - Repulsion
85.
The unit of current is coulombs/sec or Ampere
86.
Current is measured using an Ammeter
87.
Unit for Electric charge coulombe
88.
Electrolysis is the
process of the decomposition of an electrolyte by passing
electric current through it.
89.
Current flows from a point having a
higher electrical potential to a point with a lower electrical potential.
90.
Out of bulb of
100W and 40W which one as filament of higher resistance 40W
91.
One house power in 746watts.
92.
Voltmeter measures Voltage (potential
difference)
93.
The good conductor of heat and electricity is graphite
94.
Fuse wire is used to
protect an electric circuit
95.
Why does safety fuse use in electric supply in
houses - It stops the flow of
current while short circuit
96.
Why is the third (thicker) pin in a 3-pin plug
used - It is connected to escape
the feed back effect of the current.
97.
How does the municipal committee connect the
streetlight - Parallel
98.
For the conversion of low voltage steady D.C. into a high voltage weak
D.C., what instrument is used - Induction coil
99.
What is the device that steps up and steps down
the voltage in A.C. - Transformer
100.
For what purpose are rectifiers used - To convert D.C. to A.C.
101.
What principle is used in Dynamo - Electromagnetic induction
102.
What is the principal used in Electric motor - Electromagnetic induction
103.
What is the grouping of cells in a Torch Direct Current
104.
A fuse wire is used to protect an electric current
105.
Simi conductors are made
up of Silicon
106.
Who discovered gramophone T.A.Edison
107.
Who discovered thermo electricity Seebeck.
108.
Ice floats on water because of less density.
109.
To search the enemy’s invisible warship the instrument used is Radar.
110.
Which metal is used for storage battery lead.
111.
The heater element is made of Nichrome.
112.
The calorimeter is made of copper metal.
113.
The source of energy in Hydel Power station is Water
114.
Volume of water increasing on freezing Unit
of length is metre
115.
What is measured in Ricter Scale Intensity
of earthquake
116.
The sun light is a form of energy
117.
What Joule and erg are the units
- Work and Energy
118.
Which modes of transfer of heat are minimized in a
thermos flask - Radiation
119.
The surface water in a lake is just going to
freeze. What is the temperature of water
at the bottom – 4oc
120.
Relation between the
Centigrade , Fahrenheit and Kelvin …………………….
121.
Which mode of transfer of heat does not require
presence of an intervening medium - Radiation
122.
By which process we are receiving heat energy from
sun and heater - Radiation.
123.
A red when seen through a thick blue glass appears Blue.
124.
What type of vibrations produced by sound in air? -
Longitudinal
125.
Which color has got the maximum refractive index for glass - Red
126.
Which mode of transfer of heat does not require presence of an
intervening medium? - Radiation
127.
If force is expressed in Newton and the distance in meter, then what
is the unit of the work - Joule
128.
To whom the Law of Natural Selection is associated with - Darwin
129.
Why does the pressure cooker cook rice faster
- High
pressure raises the boiling point of water
130.
On what does rate of evaporation depends - Nature of liquid, exposed area of liquid
and temperature of liquid and air.
131.
Which state of matter has highest cohesion? -
Solids
132.
An atom bomb is based on chain nuclear reaction.
133.
A soft iron is used in making an electromagnet.
134.
At the moon, the Weight of the body is reduced
to one sixth of its weight on earth where as the Mass remains the
same.
135.
Petrol tanks are generally painted block to avoid
getting heated by the mode of radiation
136.
Fecal lenght of a lens varies with the colour of the light.
137.
The unit of electrical resistance is Ohm
138.
Natural magnet is known as load stone
139.
.
140.
Carrier waves have the capability of carrying
sound at the speed of 3 x 108 m/s
141.
A body weights more in vacuum than it does
in air.
142.
In bridges, allowance is made for expansion of girders.
143.
The sky appears blue due to Scattering of Light
144.
Heat radiation travel with a velocity light
145.
Which liquid has the greatest velocity Mercury
146.
Mercury freezes at -150OC
147.
In atom bomb we use the process called Nuclear Fission
148.
In hydrogen bomb we use the process called Nuclear fusion
149.
The Ozone layer protects us from ultraviolet
radiations from sun.
150.
Which of the ray are longest wave length X-rays
Dimensional
Analysis
Dimension of physical quantity: The fundamental units of mass, length
and time are denotes by capital letters, M, L and T.
Dimensional formula and Dimensional equation: A dimensional formula is
a compound expression showing how and which of the fundamental units enter into
the unit of a physical quantity.
Eg: Velocity = Distance = L =LT-1
Time
T
Dimensional formula of velocity is M0 L1 T-1
Dimensional equation: It is a equation which expresses the given
physical quantity in terms of fundamental unit of mass, length and time.
Eg:
Equation of the formula = M1 L1 T-2
The
dimensional formula of some physical quantities are given below
S.No
|
Quantity
|
Definition
|
Dimensional Formuls
|
1.
|
Area
|
(Length)2
|
M0 L2 T0
|
2.
|
Volume
|
(Length)3
|
M0 L3 T0
|
3.
|
Velocity
|
Displacement(L)/Time(T)
|
M0 L1 T-1
|
4.
|
Speed
|
Distance/Time(T)
|
M0 L1 T-1
|
5.
|
Acceleration
|
Velocity/Time(T)
|
M0 L1 T-2
|
6.
|
Force
|
mass x acceleration
|
M1 L1 T-2
|
7.
|
Work done
|
Force x displacement
|
M1 L2 T-2
|
8.
|
Power
|
Work done/Time(T)
|
M1 L2 T-3
|
9.
|
Energy
|
Total work done
|
M1 L2 T-3
|
10
|
Momentum
|
mass x velocity
|
M1 L1 T-1
|
11
|
Torque
|
Force x Velocity
|
M1 L2 T-2
|
12
|
Impulse
|
Force
|
M1 L1 T-1
|
13
|
Angle (0)
|
Arc/Radius
|
M0 L0 T0
|
14
|
Density
|
mass/Volume
|
M0 L-3 T0
|
Measurements and Units
1.
The units length in MKS system is meter
(m)
2.
The unit of mass in MKS system Kilogram
(Kg)
3.
The units of time in MKS system is Seconds
(s)
4.
The unit of area in MKS system is m2
5.
The unit of valume in MKS system is m3
6.
The unit of velocity in MKS system is m/s
7.
The unit of acceleration in MKS system is m/s2
8.
The unit of force in MKS (SI) system is Newton
9.
The unit of force in CGS system is Dyne
10. The unit of
work in CGS system is Erg
11. The unit of
work in MKS (SI) system is Joule
12. The unit of
energy in MKS (SI) system is Joule
13. The unit of
Power in MKS (SI) system is Watt
14. 1 watt equal to J/S
(1 Joule/1 Second)
15. 1 Kilo watt
equal to 1000 watts
16. 1 Astronomical
Unit 1.496 x 1011 metres
17. Velocity of
Light – 3 x 108 m/s
18. One Newton equal to 105 dynes
19. 1 light year
is equal to 9.46 x 1012 km
20. 1 watt is
equal to 107 ergs/sec
21. 1 watt is
equal to 700 lumens
22. ‘g’ value on
Moon is 1.64 m/s2
23. ‘g’ value on
Sun is 27.4 m/s2
24. ‘g’ value on
Earth is 9.8 m/s2
25. 1 Mega watt is
equal to 10,00,000 watts
26. 1 Hourse Power
(1HP) is equal to 746 watts
27. The unit
of frequency in SI system is Hertz (Hz)
28. The unit of
electric charge in SI system is Coulomb
29. The unit
of Magnetic flux in SI system is Weber (Wb)
30. The unit of
induct in SI system is Henry (H)
31. The unit of
Magnetic Induction in SI system is Tesla
32. The unit of
Density in MKS system is Kh/m3
33. The unit of
light intensity in SI system is Candela
(Cd)
34. The amount of
matter in SI system is Mole (mol)
35. The unit of
plane angle in SI system is Radiar
(rad)
Scientific
Instruments
Altimeter: It is used for measuring
altitudes (height) specially used in air crafts.
Ammeter: It is used for measuring the
strength of the current in amperes directly.
Anemometer : It is used for recording winds
velocity.
Audiometer: It is used for measuring the
intensity of sound.
Barometer: It is used for measuring the
atmospheric pressure.
Calorimeter: It is used for recording the
quantities of heat.
Computer: It is an electronic instrument
used for data collection.
Chronometer: It is used for measuring
accurate time.
Fathom-meter: It is used for measuring depth
of ocean.
Galvanometer: It is used for detecting the
presence of current.
Hydrometer: It is an instrument used for
measuring the specific gravity of liquids.
Hygrometer: It is used for measuring
humidity in air.
Hydrophone: It is used for recording sound
under the water.
Lactometer: It is used for measuring the
purity of milk.
Megaphone: It is used for carrying sound
to a long distance.
Microscope: It is used for magnifying minute
objects by a lens system.
Manometer: It is used for determining the
pressure of gas.
Odanmeter: It is used for measuring the
distance covered by wheeled cycles.
Photometer: It is used for measuring the
intensity of light.
Techometer: It is an instrument to measure
speed of moving bodies (especially aeroplanes)
Transformer: It is used to reduce or
increase the voltage of an alternating current.
Telestar: It is an instrument to transmit
wireless or television broadcast more distance across continents via space.
Voltmeter: It measures the potential
difference.