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Q.A light year is a unit of
1 Velocity
2 Distance
3 Time
4 Energy
Ans: 2
Q.Which one among the following is not a mixture?
1 Graphite
2 Steel
3 Glass
4 Brass
Ans: 1
Q.Which one among the following most correctly determines the atomic number of an element?
1 Number of protons and electrons
2 Number of nucleons
3 Number of ions
4 Number of protons
Ans: 4
Q.Which one among the following is used to make periscope?
1 Concave lens
2 Concave mirror
3 Plane mirror
4 None of these
Ans: 3
Q.Kilowatt-hour is the unit of1 electric energy
2 electric power
3 electric potential
4 potential difference
Ans: 1
Q.A stable nucleus (light with A < 10) has
1 no protons
2 no neutrons
3 exactly the same number of neutrons and protons
4 more neutrons than protonsAns: 3
Q.Which one among the following waves are called waves of heat energy?
1 Radio waves
2 Microwaves
3 Ultraviolet waves
4 Infrared waves
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Ans: 4
Q.Ultrasonic waves are those sound waves having frequency
1 between 20 hertz and 1000 hertz
2 between 1000 hertz and 20000 hertz
3 less than 20 hertz
4 more than 20 kilohertz
Ans: 4
Q.The best colours for a Sun umbrella will be -
1 white on top and black on inside
2 red on top and black on inside
3 black on top and white on inside
4 black on top and red on inside
Ans: 1
Q.Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt ofbarium because -
1 barium is a good absorber of X-rays and helps stomach to appear clearly
2 barium salts are white in colour and this helps stomach to appear clearly
3 barium allows X-rays to pass through the stomach
4 barium salts are easily available
Ans: 1
Q. In SONAR, we use -
1 radio waves
2 audible sound waves
3 infrasonic waves
4 ultrasonic waves
Ans: 4
Q.A liquid is kept in a regular cylindrical vessel up to a certain height. If this vessel is replacedby another cylindrical vessel having half the area of cross-section of the bottom, the pressureon the bottom will -
1 be increased to twice the earlier pressure
2 be reduced to one-fourth the earlier pressure
3 remain unaffected
4 be reduced to half the earlier pressure
Ans: 1
Q.The time period of a simple pendulum having a spherical wooden bob is 2 second. If the bob
is replaced by a metallic one twice as heavy, the time period will be -
1 more than 2 second
2 1 second
3 2 second
4 less than 1 second
Ans: 3
Q.Which one among the following statements about an atom is not correct?
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1 Atoms are the basic units from which molecules and ions are formed
2 Atoms always combine to form molecules
3 Atoms aggregate in large numbers to form the matter that we can see, feel and touch
4 Atoms are always neutral in nature
Ans: 3
Q.The working principle of a washing machine is -
1 Dialysis
2 Centrifugation
3 Reverse osmosis
4 Diffusion
Ans: 2
Q.A spherical ball made of steel when dropped in mercury container will
1 sink in mercury
2 will be on the surface of mercury
3 will be partly immersed in mercury
4 will dissolve in mercury
Ans: 3
Q.The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as
1 Ultrasonics
2 Audible sounds
3 Infrasonics
4 Megasonics
Ans: 2
Q.Pure water is bad conductor of electricity because it is
1 not volatile2 feebly ionized
3 a non-polar solvent
4 a very good solvent
Ans: 2
Q.The metals commonly used for electroplating are
1 Gold, Sodium & Chromium
2 Chromium, Copper & Nickel
3 Nickel, Lead & Chromium
4 Gold, Sodium & Potassium
Ans: 2
Q.Gamma rays have greatest similarity with
1 a-rays
2 b-rays
3 X-rays
4 U.V.rays
Ans: 3
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Q.Two 220 V, 60 W bulbs are used for 5 hours a day for 10 days. If each unit (1 kilowatt hour)costs Rs. 3.50, find the total expense for it -
1 Rs. 10.50
2 Rs. 38.50
3 Rs. 77.00
4 Rs. 21.00
Ans: 4
Q.There are four statements gives below explaining why mercury is chosen as a thermometricliquid. which of these statements is wrong?
1 Volume of mercury increases equally for equal rises of temperature
2 Mercury is a good conductor of heat
3 Mercury does not stick to glass
4 Mercury has a large specific heat
Ans: 1
Q.The internal energy of a body means -
1 Sum total of its kinetic and potential energy of its constituent molecules.
2 its kinetic energy
3 Total kinetic energy of its constituent moleules
4 Sum total of its kinetic and potential energy
Ans: 1
Q.Which of the following is a dimensionless quantity?
1 Acceleration
2 Volume
3 Refractive Index
4 Kinetic energy
Ans: 3
Q.Four wires of same material and different dimensions are stretched under the equal weight,which one will suffer greater elongation? The dimensions are given below -
1 Length 100 cm, diameter 1 mm
2 Length 200 cm, diameter 2 mm
3 Length 300 cm, diameter 3 mm
4 Length 400 cm, diameter 0.5 mm
Ans: 4
Q.Water is used in hot water bags because
1 it is easily obtained
2 it has high specific heat
3 it is cheaper and is not harmful
4 it is easy to heat water
Ans: 2
Q.Water drops cannot stick to the oily surface due to
1 surface tension
2 lack of adhesive force
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3 water is lighter than oil
4 cannot mix each other
Ans: 2
Q.Energy in reflected light
1 does not depends on the angle of incidence
2 decreases with the increase in angle of incidence
3 increases with the increase in angle of incidence
4 becomes maximum for angle of incidence equal to 45 degree
Ans: 1
Q.The unit of power is called -
1 Watt
2 Dyne
3 Erg
4 Ohm
Ans: 1
Q.The sound produced by a bat is -
1 Ultrasonic
2 Infrasonic
3 Audible
4 Subsonic
Ans: 1
Q.When a bar magnet is cut into two equal halves, the pole strength of each piece -
1 Becomes zero
2 Remains the same
3 Becomes Half4 Becomes Double
Ans: 2
Q. In a refrigerator, cooling is produced by
1 the evaporation of a volatile liquid
2 the sudden expansion of a compressed gas
3 the ice which deposits on the freezer
4 None of the above
Ans: 1
Q.Which principle states that when a body is partially or totally immersed in a fluid, it
experiences an upward thrust equal to the weight of fluid displaced by it:1 Archimedes'
2 Hooke's
3 Pascal's
4 Newton's
Ans: 1
Q.Cream gets separated from milk when it is churned because of:
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1 Gravitational force
2 Centrifugal force
3 Frictional force
4 Cohesive force
Ans: 2
Q.Speed of sound is maximum in:
1 Gas
2 Same in all cases
3 Liquid
4 Solid
Ans: 4
Q.Newton is a unit of:
1 Force
2 Acceleration
3 Work
4 Energy
Ans: 1
Q.The mass of a body at the centre of earth is:
1 Zero
2 Remains constant
3 More than at the surface
4 Less than at the surface
Ans: 2
Q.1 Joule is equivalent to
1 103
ergs2 105 ergs
3 107ergs
4 1011
Ans: 3
Q.The coating of a thin layer of zinc on steel or iron objects is known as
1 Galvanising
2 Hot dipping
3 Tinning
4 Electroplating
Ans: 1
Q.Electric current in a metal wire is due to the flow of
1 Protons
2 Electrons
3 Ions
4 None of these
Ans: 2
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Q.Optic fibres are mainly used for
1 Weaving
2 Communication
3 Musical instruments
4 Food industry
Ans: 2
Q.Which among the following is a chemical change?
1 A wet towel dries in the sun
2 Lemon juice added to tea causing its colour to change
3 Coffee is brewed by passing steam through ground coffee
4 Hot air rises over a radiator
Ans: 2
Q.Which of the following is a vector quantity?
1 Force
2 Temperature
3 Energy
4 Momentum
Ans: 1
Q.At what point the Centigrade and the Fahrenheit temperatures are the same?
1 10 degree
2 0 degree
3 -10 degree
4 -40 degree
Ans: 4
Q.Which among the following is an element?1 Alumina
2 Brass
3 Graphite
4 Silica
Ans: 3
Q. In electro discharge machining, cutting tools are usually made of
1 High speed steel
2 Tool steel
3 Carbide-tipped tool
4 Graphite
Ans: 4
Q.Glass is made of
1 Sand & Silicate
2 Quartz & Mica
3 Sand & Silt
4 None of these
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Ans: 2
Q.Which of the following is called strategic metal?
1 Silicon
2 Titanium
3 Uranium
4 Germanium
Ans: 3
Q.Heavy water is
1 Sea water(H2O + salt)
2 D2O2
3 H2O2
4 None of the above
Ans: 2
Q.The operation of threading a drilled hole is called
1 Tapping2 Broaching
3 Lapping
4 Reaming
Ans: 1
Q.The first symbol in a grinding wheel code is the
1 Bond Type
2 Grain size
3 Structure
4 Abrasive Type
Ans: 4
Q.Thermit welding is a form of
1 Gas welding
2 Fusion welding
3 Resistance welding
4 Arc welding
Ans: 2
Q.Electrode gets consumed in which type of welding process?
1 Arc
2 Thermit
3 T.I.G.
4 Gas
Ans: 1
Q.Which of the following metals can be easily drawn into the wire?
1 Lead
2 Copper
3 Tin
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4 Zinc
Ans: 2
Q.Base of a transistor is
1 Heavily doped
2 Moderately doped
3 Lightly doped
4 None of the above
Ans: 4
Q.Lube oil is used in diesel engines
1 To ignite
2 To cool the engine
3 To reduce friction
4 2 and 3 both
Ans: 4
Q.Air is charged in the cylinder of diesel engine by1 Exhaust valve
2 Inlet valve
3 Injector
4 Air Box
Ans: 2
Q.Type of filter fitted in a tractor is
1 Paper Type
2 Cotton Type
3 Oil-bath Type
4 Wire Mesh TypeAns: 1
Q.Nichrome is commonly used for
1 Transformer windings
2 Battery connetions
3 Lamp filament
4 Heater coils
Ans: 4
Q. In a telescope of magnification power 10, the focal length of the objective lens is 60 cm, whatwill be the total length of eyepiece
1 6 cm2 25 cm
3 30 cm
4 50 cm
Ans: 1
Q.A hollow cylindrical rod is filled with air, to make it a resonance column. To produce a wave oflength 48 cm the minimum length of rod should be
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1 12 cm
2 24 cm
3 48 cm
4 96 cm
Ans: 2
Q.An object is placed between the pole of concave mirror and the focus of the mirror, the imageformed will be
1 Behind the mirror, virtual, erect and magnified
2 At infinity, real inverted and highly enlarged
3 Byond centre of curvature, real inverted and enlarged
4 Beyond 2F, real inverted and enlarged
Ans: 1
Q.When 1 litre of water freezes, the volume of ice formed will be
1 0.9 litre
2 1.0 litre
3 1.11 litre
4 1.5 litre
Ans: 3
Q.A body is thrown vertically upwards with a speed of 100 m/sec. While coming back onground, its speed at starting point will be
1 100 m/sec
2 1000 m/sec
3 50 m/sec
4 200 m/sec
Ans: 1
Q.Which one of the following is not a radioactive element?
1 Uranium
2 Radium
3 Thorium
4 Cadmium
Ans: 4
Q.Superconductors are those materials
1 Which become non-conductors at transition point
2 Which looses all electrical resistance when cooled below a certain temperature
3 In which resistance rises to infinity below certain temperature
4 Which conducts electricity in extra widths
Ans: 2
Q.Which of the following is a physical change?
1 Boiling of Water
2 Rusting of Iron
3 Boiling of an Egg
4 Burning of Candle
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Ans: 1
Q. In an atom no two electrons have all the four quantum numbers identical. This is known as
1 Paulis Exclusion principle
2 Hunds Rule
3 Aufbau Principle
4 Avogadros Law
Ans: 1
Q.What is the power factor of a pure resistor circuit?
1 One
2 Zero
3 Leading
4 Lagging
Ans: 1
Q.A transformer mainly transforms -
1 Current2 Voltage
3 Frequency
4 Power
Ans: 2
Q.There is 20 volt accross the inductor and 15 volt across the resistance in the a.c. suppliedseries R-L circuit. What would be the supply voltage?
1 20 volt
2 15 volt
3 25 volt
4 17.5 volt
Ans: 3
Q.What is the value of knee voltage of silicon diode?
1 0.3V
2 0.33V
3 0.7V
4 1.1V
Ans: 3
Q.Estimated time period of a pendulum of length 0.2m is closer to is
1 .5 sec
2 1 sec3 2 sec
4 None of these
Ans: 2
Q.Which of the following light waves is outside the visible spectrum?
1 Violet
2 Blue
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3 Yellow
4 Ultraviolet
Ans: 4
Q.A periscope works by the principle of
1 Refraction
2 Total Internal reflection
3 Diffraction
4 Reflection and refraction
Ans: 2
Q.A falling drop of rain water acquires the spherical shape due to
1 Surface Tension
2 Gravitational force
3 Atmospheric pressure
4 Viscosity
Ans: 1
Q.Each of 3 capacitors of capacity C are connected together in series. This combination is addedin paralled to a capacitor of capacity C. Resultant capacity will be
1 C
2 3C
3 4C
4 4C/3
Ans: 4
Q.A boy has five resistance of 1/5 ohm each. The maximum resistance that can be formed withthem is
1 0.5 ohm
2 1 ohm
3 1/25 ohm
4 1/5 ohm
Ans: 2
Q.For generating large currents on D.C. generators which winding is generally preferred?
1 Progressive wave winding
2 Lap winding
3 Retrogressive wave winding
4 Current depends on design
Ans: 2
Q.Calorie value is the least of the following materials -
1 Coal gas
2 Producer gas
3 Steam fiery gas
4 Oil gas
Ans: 2
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Q.Which of the following is not a property of difference amplifier?
1 Capacitor is used in it
2 It is used to compare two signals
3 Difference amplifier yields more than the direct couple ampliier
4 Frequency of difference amplifier remains flat from zero to high frequency
Ans: 1
Q.Germanium possesses -
1 Two valence electrons
2 Three valence electrons
3 Four valence electrons
4 Five valence electrons
Ans: 3
Q.Moisture can be removed from lubricating oil using -
1 Tubular centrifugal
2 Clarifier3 Sparkler filter
4 Vacuum leaf filter
Ans: 1
Q.The information is sent by CW transmitter by -
1 Changing the audio frequency
2 Interrupting radio signal
3 Using microphone
4 Using camera
Ans: 1
Q. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the--
1 Exhaust will be smokey
2 Piston rings would stik into piston grooves
3 Scavenging occurs
4 Engine starts overheating
Ans: 1
Q.What is the proper use of signal generator?
1 Designing
2 Testing
3 Repairing4 All of the Above
Ans: 4
Q.Which type of oscillator is most stable in simple circuit?
1 Crystalline oscillators
2 Clapp oscillators
3 Colepitts oscillator
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4 Armstong oscillator
Ans: 1
Q.What is the S. I. unit of magnetic flux density?
1 Gauss
2 Tesla
3 Oersted
4 Weber
Ans: 2
Q.What are Ferrites?
1 Magnetic but have low resistance
2 Magnetic but have high resistance
3 Non-magnetic with low resistance
4 Non-magnetic with high resistance
Ans: 2
Q.An electronics circuits in which different components such as Diode, Resistor and Capacitoretc. are connected separately is called -
1 Chassis
2 Printed board
3 Integrated circuit
4 Discrete circuit
Ans: 3
Q.Selectivity of the receiver can be increased by which of the following?
1 By using more tuned circuit
2 By decreasing number of tuned circuit
3 By using loudspeaker
4 By increasing gain of the receiver
Ans: 4
Q. In case of ball bearings, which part is made harder than others -
1 Ball
2 Outer race
3 Inner race
4 All are made equally hard
Ans: 4
Q.Which of the following motors is preferred when quick speed reversal is the mainconsideration?
1 Squirrel cage induction motor
2 Wound rotor induction motor
3 Synchronous motor
4 D. C. motor
Ans: 4
Q.Motor-generator set for D. C. arc welding has generator of -
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1 Series type
2 Shunt type
3 Differentially compound type
4 Level compound type
Ans: 3
Q. ...signal will become zero when the feedback signal and reference signs are equal.
1 Input
2 Actuating
3 Feedback
4 Reference
Ans: 2
Q.The capacitance, in force-current analogy, is analogous to -
1 Momentum
2 Velocity
3 Displacement
4 Mass
Ans: 4
Q.Co-efficient of velocity as compared to the coefficient of discharge is -
1 Less
2 More
3 Equal
4 Less or more depending on flow
Ans: 2
Q.A. C. servomotor is basically a/an ...
1 Universal motor2 Single phase induction motor
3 Two phase induction motor
4 Three phase induction motor
Ans: 3
Q. In resistance heating, highest working temperature is obtained from heating elementsmadeof...
1 Nickel and copper
2 Nichrome
3 Silicon carbide
4 Silver
Ans: 2
Q.Among the following statement which is the false?
1 Only minority impurities are added in a junction diode
2 Higher temperature increases the leakage current of diode
3 A simple zener diode works when connected between anode to cathode
4 Zener is mostly used in voltage regulator
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Ans: 1
Q. In steam turbine the action of steam is -
1 Stable
2 Dynamic
3 Stable and dynamic
4 Neither stable nor dynamic
Ans: 2
Q.Protein is not available in which of the following?
1 Meat
2 Milk
3 Rice
4 Pulse
Ans: 3
Q.Lever functions on which of the following principles?
1 Crank-shaft2 Joining rod
3 Crank pin
4 Cross head
Ans: 1
Q.What would be the expenditure in 30 days at the rate of 50 paise per unit, if a bulb of 100 Wis used five hours per day?
1 Rs. 10.50
2 Rs. 8.50
3 Rs. 7.50
4 Rs. 9.50
Ans: 3
Q.What is the frequency of the receiver?
1 488 kHz
2 445 kHz
3 455 kHz
4 456 kHz
Ans: 4
Q.A diode....
1 Functions only in one direction
2 Functions in both the directions3 Does not function at all
4 It gets damaged, when voltage is applied
Ans: 1
Q.What is the unit of electrical energy?
1 Ampere
2 Volt
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3 Watt
4 Kilowatt-hour
Ans: 4
Q.How will a red flower appear, if it is seen through a green glass?
1 Red
2 Brown
3 White
4 Green
Ans: 2
Q.Which one of the following allotropes of carbon is used for cutting and drilling?
1 Diamond
2 Graphite
3 Activated carbon
4 Carbon black
Ans: 1
Q.Which of the following is used in semi-conductors?
1 Aluminium
2 Copper
3 Silicon
4 None of these
Ans: 3
Q.The blue colour of the clear sky is due to -
1 Diffraction of light
2 Dispersion of light
3 Reflection of light4 Refraction of light
Ans: 2
Q. In amplitude modulation -
1 Amplitude of the carrier is kept constant
2 Change occurs in carrier frequency
3 Amplitude is varied according to the instaneous value of modelling wave
4 None of these
Ans: 3
Q.While checked with a multimeter, an open resistor reads -
1 Zero
2 Infinite
3 High but within tolerance.
4 Low but not zero
Ans: 2
Q.Pulley in a belt drive acts as -
1 Cylindrical pair
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2 Turning pair
3 Rolling pair
4 Sliding pair
Ans: 1
Q.Minority carrier in P-type semiconductor is -
1 Free electrons
2 Free holes
3 Holes and electrons both
4 Holes minus electrons
Ans: 2
Q.Which of the following can be used to control the speed of a D. C. motor?
1 Thermistor
2 Thyristor
3 Thyratron
4 Transistor
Ans: 2
Q.To convert moving coil galvanometer into an ammeter, which of the following methods isused?
1 Small resistance in series
2 Small resistance in parallel
3 High resistance in series
4 High resistance in parallel
Ans: 2
Q.When the load is above ....., a synchronous motor is found to be more economical.
1 2 KW
2 20 KW
3 50 KW
4 100 KW
Ans: 3
Q.Transistors used in electronic equipments are mostly made of
1 Silver
2 Copper
3 Silicon
4 Carbon
Ans: 3
Q.Which of the following is a unit of angle measurement?
1 Hour
2 Second
3 Millimeter
4 None of these
Ans: 2
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Q.Find the incorrect one
1 Hertz is used to measure frequency.
2 Kelvin is used to measure temperature.
3 Bel is used to measure atmospheric pressure.
4 ohm is used to measure electrical resistance.
Ans: 3
Q. If the radius of the earth were to shrink by 1 %, its mass remaining the same, the value of 'g'on the earth's surface would
1 increase by 0.5%
2 increase by 2%
3 decrease by 0.5%
4 decrease by 2%
Ans: 2
Q.Which of the statements is NOT correct?
1 The velocity of sound in air increases with the increase of temperature
2 The velocity of sound in air is independent of pressure
3 The velocity of sound in air decreased as humidity increases
4 The velocity of sound in air is not affected by the change in amplitude and frequency
Ans: 3
Q.Diffusion of light in the atmosphere takes place due to
1 Carbon dioxide
2 Dust particles
3 Helium
4 Water vapours
Ans: 2
Q.Consider the following statements: A 4-wheel vehicle moving a sharp circular path at highspeed will 1. Overturn about its outer wheels 2. Overturn about its inner wheels 3. Skidoutwards 4. Skid inwards Which of these statements are correct?
1 1 & 3
2 2 & 4
3 2 & 3
4 1 & 4
Ans: 3
Q.The power of lens is - 2D. What is its focal length?
1 2m
2 0.5m
3 1.0m
4 0.5m
Ans: 4
Q.X-rays comprise of:
1 Electrons only
2 Protons only
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3 Neutrons only
4 Electromagnetic radiations
Ans: 4
Q.Which one of the following is a vector?
1 Kinetic energy
2 Pressure
3 Rate of change of momentum
4 Density
Ans: 3
Q.One complete set of positive and negative values of an alternating quantity is known as a
1 Phase
2 Time Period
3 Frequency
4 Cycle
Ans: 4
Q.Which of the following is an example of class - I Lever?
1 Pliers
2 Nut Cracker
3 Tongs
4 All of the Above
Ans: 1
Q.The special filters used to reduce pollutants from the exhaust of a car are called
1 Water Jacket
2 Exhaust Manifold
3 Baffle plate4 Catalytic Converter
Ans: 4
Q. If two electrically charged bodies are connected by a wire, then the electric current will notflow if
1 Both have the same capacity
2 Both have the same temperature
3 Both have the same potential
4 None of these
Ans: 3
Q.The colour of light which travels through glass with the minimum speed is1 Red
2 Yellow
3 Green
4 Violet
Ans: 2
Q.The device used for converting A. C. from higher voltage to lower voltage or vice versa is
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called
1 Transmitter
2 Commutator
3 Transformer
4 Generator
Ans: 3
Q. If the linear momentum of a particle is doubled, then its kinetic energy will be
1 Doubled
2 Quadrupled
3 Halved
4 None of these
Ans: 2
Q.Watt-hour is the unit of
1 Energy
2 Power
3 Potential
4 Current
Ans: 1
Q.Which device mixes air and petrol (gas) for the internal combination engine?
1 Carburetor
2 Choke
3 Crankshaft
4 Cylinder
Ans: 4
Q.The black hole theory was discovered by1 S. Chandrashekhar
2 Har Gobind Khorana
3 C. V. Raman
4 S. Ramanujan
Ans: 1
Q. It is difficult to magnetise steel because of its
1 Low permeability
2 High retentivity
3 High permeability
4 High densityAns: 1
Q. In electric machines, laminated cores are used with a view to reduce the
1 Friction loss
2 Copper loss
3 Eddy current loss
4 Hysteresis loss
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Ans: 3
Q. In DC generators, the brushes are always placed
1 Along the Geometric Neutral Axis (GNA)
2 Along the Magnetic Neutral Axis (MNA)
3 Perpendicular to MNA
4 Perpendicular to GNA
Ans: 2
Q.Critical resistance of a DC generator RC is
1 Inversely proportional to speed
2 Proportional to speed
3 Inversely proportional to the square of speed
4 Proportional to the square of speed
Ans: 1
Q. If the current and the voltage are out of phase by 90 degree, then the power is
1 Minimum2 Maximum
3 1.1 VI
4 Zero
Ans: 4
Q.Megger is an instrument to measure
1 Very low resistance
2 Insulation resistance
3 Q of a coil
4 Inductance of a coil
Ans: 2
Q.The forward resistance of a diode is
1 Zero
2 Infinity
3 Very small
4 Very large
Ans: 1
Q.For lubricating roller bearing, lubricant generally required is
1 Semi-solid
2 Solid
3 Liquid
4 None of the above
Ans: 1
Q.Which type of reaction produces the most harmful radiation?
1 Fusion reaction
2 Chemical reaction
3 Fission reaction
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4 Photo-Chemical reaction
Ans: 3