physics objective question

8/22/2019 Physics Objective Question

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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



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


16/23

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

physics objective question

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