# 150+ Most Important Physics GK Questions and Answers

The modern era is the science era, and Physics is considered one of the core components of Science. Generally, the scientific study and their rational representation of the natural phenomena occurring around us is known as Physics or Natural Science. This article has covered 150+ fundamental Physics GK Questions with useful answers for SSC, UPSC, Banking, and other competitive tests.

It is essential to have a solid understanding of Physics GK in order to perform well in General Science. Physics GK Questions have always come first, whether you are studying for a competitive test or an annual school exam. We are here with hundreds of most frequently asked Physics GK Questions and Answers to help you understand the basic concepts.

## The Complete Beginners Guide to Physics GK Questions:

Which guide book do you follow for Physics GK questions? Does it contain all the required chapters? We’ve gladly published a bundle of 100+ most repeated Physics GK Questions and Answers in PDF format. The series is equally essential for all forms of competitive exams in India including RRB, SSC, UPSC, Bank, etc. So be confident and start your preparation with 150+ free Physics General Knowledge Questions.

## The Importance of Physics GK Questions in Competitive Exam:

Physics is also a very essential and exciting subject like other subjects of science. Physics GK Questions are crucial for every academic and nonacademic career-oriented competitive test. It is just as vital for an engineering student as for a fifth-grade kid. In this article we have discussed 150+ most repeated Physics GK Questions in English from some of the most important chapters of Physics. Which includes:

• Units and Measurement
• Reflection and Refraction of Light
• Human Eye
• Magnetism
• Electric Current
• Various Sources of Energy
• Distance

## Get Ready With 150+ Most Important Physics General Knowledge Questions:

Q1) Which alloy is used to make clock pendulums:
A) Mischmetal
B) Invar
C) Brass
D) None of the Above

Q2) When the red light is exposed on a yellow flower, it will appear ________ in color:
A) Yellow
B) Orange
C) Black
D) Red

Q3) Longitudinal waves can’t travel through:
A) Solid
B) Vacuum
C) Gas
D) None of These

Q4) Rose appears red in sunlight, but the same Rose appears __________ in green light:
A) Red
B) Black
C) Green
D) Yellow

Q5) The current flowing in one direction is called _______:
A) Alternating Current
B) Induced Current
C) Direct Current
D) Ionic Current

Q6) When detergent is added to water, the surface tension will:
A) Increases
B) Decreases
D) No Change
D) Become Zero

Q7) What is the correct formula for Angular Momentum:
A) L= r×p
B) L= r.p
C) L= p×r
D) L= p.r

Q8) What is the unit of measurement for the universal gravitational constant:
A) Nm/Kg²
B) Nm²/Kg
C) Nm²/Kg²
D) Nm²Kg²

Q9) Rockets work on the principle of:
A) Newton’s First Law
B) Newton’s Second Law
C) Newton’s Third Law
D) Archimedes Principle

Q10) Tesla is a unit of magnetic ________:
A) Flux
B) Induction
C) Moment
D) Field

Q11) Doppler’s effect is associated with:
A) Electric Current
B) Light
C) Heat
D) Sound

Q12) What is the unit of noise pollution:
A) Decibel
B) Decimal
C) ppm
D) Hertz

Q13) Temperatures in centigrade and Fahrenheit are the same at:
A) 32°
B) 40°
C) -40°
D) -273°

Q14) Butter paper is an example of a ______ object:
A) Transparent
B) Translucent
C) Opaque
D) Luminous

Q15) Which of the following is not a part of the AC generator:
A) Slip Rings
B) Coil
C) Commutator
D) Galvanometer

Q16) What is the measuring unit for the length of light waves:
A) Barrel
B) Angstrom
C) Knot
D) Carat

Q17) A magnifying glass comprises a simple:
A) Convex Lens
B) Convex Mirror
C) Concave Lens
D) None of These

Q18) The intensity ratio of waves is 25:9. What is the ratio of their amplitudes:
A) 5:3
B) 3:5
C) 25:9
D) 50:18

Q19) Plank constant has the dimensions of:
A) Energy
B) Linear Momentum
C) Angular Momentum
D) Force

Q20) 1 CLS unit is equals to:
A) 1.2 Times the Mass of the Sun
B) 1.3 Times the Mass of the Sun
C) 1.4 Times the Mass of the Sun
D) 1.6 Times the Mass of the Sun

Q21) What is the complete form of RADAR:
D) Region Device and Ranging

Q22) The rate of change in displacement over time is called _______:
A) Acceleration
B) Speed
C) Velocity
D) None of These

Q23) The _______ lens is thick at the middle and thin at the edges:
A) Concave
B) Convex
C) Bifocal
D) None of These

Q24) Which of the following metals has the greatest thermal and electrical conductivity:
A) Silver
B) Copper
C) Iron
D) None of These

Q25) The Tyndall effect is due to:
A) Scattering of Light
B) Dispersion of Light
C) Refraction of Light
D) Reflection of Light

Q26) Fulminology is the study of:
A) Volcanic Eruptions
B) Lightening
C) Natural Gases
D) Atmosphere

Q27) Which of the following statements is always true:
A) Displacement > Distance
B) Displacement < Distance
C) Displacement = Distance
D) None of These

Q28) The whistle of a fast-moving rail engine is heard ascending-descending when it crosses the station; it is called:
A) Peltier Effect
B) Doppler Effect
C) Ultrasonic Voice
D) Subsonic Effect

Q29) The velocity of sound doesn’t affect:
A) Heat
B) Medium
C) Pressure
D) Humidity

Q30) Curie is a unit of:
A) Current
B) Voltage
C) Luminous Intensity

Q31) A diode is used for:
A) Modulation
B) Oscillation
C) Amplification
D) Rectification

Q32) The scientist associated with flotation is:
A) Archimedes
B) Newton
C) Louis Pasteur
D) None of These

Q33) The unit of Viscosity is:
A) Poise
B) Pascal
C) Poiseuille
D) None of These

Q34) Acceleration is inversely proportional to:
A) Force
B) Velocity
C) Mass
D) Distance

Q35) Which among the following waves can’t be polarized:
A) Sound
C) Infrared
D) Ultraviolet

### Also Read:• 200+ Important Indian Polity MCQ for All India Competitive Exams

Q36) What is the frequency of direct current:
A) 50 Hz
B) 60 Hz
C) Zero
D) Infinite

Q37) The value of acceleration due to gravity at the equator will _______ when the earth stops rotating:
A) Increase
B) Decrease
C) Become Zero
D) Remains Same

Q38) Which of the following is used in the oven:
A) X-Rays
B) UV Rays
C) Microwaves

Q39) Who enunciated the laws of planetary motion:
A) Nicolaus Copernicus
B) Johannes Kepler
C) Issac Newton
D) Galileo

Q40) Which of the following diodes is most commonly used as a voltage regulator:
A) LED
B) Zener Diode
C) Var actor Diode
D) Tunnel Diode

Q41) Gamma rays can cause:
A) Gene Mutation
B) Sneezing
C) Burning
D) Fever

Q42) Hydraulic machines work on the principle of:
A) Newton’s Law
B) Joule’s Law
C) Pascal’s Law
D) Flotation Law

Q43) Name the commercial unit of electric energy:
A) Kwh
B) Ampere
C) Volt
D) Ohm

Q44) One calorie is equal to:
A) 1.284J
B) 4.186J
C) 6.418J
D) 8.146J

Q45) What is the refractive index of a diamond:
A) 1.44
B) 1.47
C) 1.77
D) 2.42

Q46) The upward force on a floating body is called ______:
A) Jerk
B) Buoyancy
C) Archimedal Force
D) Anti Gravity

Q47) Which colour is formed when Yellow and Cyan are mixed:
A) Red
B) Green
C) Blue
D) White

Q48) _____ are used in RADAR systems:
A) Ultraviolet
B) Infrared
D) All of These

Q49) 10⁴ Fermi is equal to:
A) 1 Meter
B) 100 Micron
C) 1 Angstrom
D) 0.1 Angstrom

Q50) Rad/sec is the unit of:
A) Angular Displacement
B) Angular Velocity
C) Angular Acceleration
D) None of These

Q51) 1 Micron is equal to:
A) 100 mm
B) 1000 mm
C) 0.01 mm
D) 0.001 mm

Q52) Which of the following is an auxiliary unit:
C) Ampere
D) Both A and B

Q53) _____ is used to examine the internal parts of our body:
A) Microscope
B) Periscope
C) Odometer
D) Endoscope

Q54) Which instrument is used to measure the height or elevation:
A) Micrometre
B) Telemeter
C) Hypsometer
D) Tonometer

Q55) To measure the strength of direct current _____ is used:
A) Tachometer
B) Spectrometer
C) Voltmeter
D) Tangent Galvanometer

Q56) Find out the true statements regarding thermal conductivity:
A) Steel>Wood>Water
B) Steel>Water>Plastic
C) Water>Wood>Steel
D) Water>Steel>Plastic

Q57) As the temperature increases, the thermal conductivity of the solid metal ______:
A) Increases
B) Decreases
C) Remains Same
D) None of These

Q58) _____ is the external energy applied on a body to change its state of rest or uniform motion:
A) Force
B) Pressure
C) Buoyancy
D) Impulse

Q59) If a car is running at a speed of 72 km/hr and stops after 45 seconds, then what will be the retardation:
A) 0.3 m/s²
B) 0.25 m/s²
C) 0.44 m/s²
D) 3 m/s²

Q60) Surface tension depends on:
A) Atmospheric Pressure
B) Nature of the Liquid
C) Temperature of the Liquid
D) All of These

Q61) The matric system is also called:
A) CGS
B) MKS System
C) SI
D) None of These

Q62) Plane angle and solid angle are:
A) Fundamental Quantity
B) Derived Quantity
C) Supplementary Quantity
D) None oy These

Q63) Which one of the following is not a secondary pigment:
A) Green
B) Red
C) Blue
D) Yellow

Q64) When you look at a mirror, the image you see in the mirror is a __________ image:
A) Virtual
B) Real
C) Reflected
D) Plain

Q65) What type of spectrum is the rainbow:
A) Natural Spectrum
B) Artificial Spectrum
C) Both A and B
D) None of These

Q66) Which of the following has no units:
A) Thermal Capacity
B) Magnetic Susceptibility
C) Angular Acceleration
D) None of These

Q67) The primary cause of motion is:
A) Velocity
B) Acceleration
C) Force
D) Energy

Q68) Gravitational mass is a _______ quantity:
A) Vector
B) Scalar
C) Tensor quantity
D) None of the above

Q69) The momentum of a body depends:
A) Only on its Velocity
B) Only on its Mass
C) Both A and B
D) None of the Above

Q70) The force acting on a body is always parallel to:
A) Velocity
B) Acceleration
C) Momentum
D) None of the Above

Q71) A body whose momentum is a constant must have a constant:
A) Acceleration
B) Force
C) Velocity
D) None of These

Q72) The motion of a bicycle wheel is:
A) Translatory
B) Rotary
C) Both A and B
D) Curvilinear

Q73) Force × time = _________:
A) Momentum
B) Impulse
C) Force
D) None of These

Q74) Inertia is proportional to:
A) Mass
B) Weight
C) Length
D) Height

Q75) The dimensional formula of the Planck’s constant is:
A) [ML2T-2]
B) [MLT]
C) [M2L2T3]
D) [ML2T-1]

Q76) Light cannot be polarized by:
A) Reflection
B) Diffraction
C) Refraction
D) All of These

Q77) Total internal reflection would takes place if:
light passes:
A) From Air to Water
B) From Water to Glass
C) From Glass to Diamond
D) From Glass to Water

Q78) If the length of a pendulum is doubled and the diameter of its ball is reduced to half, it’s time period will be:
A) √2
B) Half
C) Remains Same
D) Double

Q79) A particle is thrown upwards at a speed of 39.2 m/s. Calculate it’s time for maximum height:
A) 3 Sec
B) 4 Sec
C) 5 Sec
D) 6 Sec

Q80) Electric wires are generally coated with:
A) Polypropylene
B) Polyvinyl Chloride
C) Polyurethane
D) Polyethylene

Q81) The presence of free ___________ in a substance makes it a conductor of electricity:
A) Positrons
B) Protons
C) Electrons
D) Neutrons

Q82) During fog we cannot see because of:
A) Reflection
B) Internal Reflection
C) Refraction
D) Scattered Light

Q83) ___________ determines the speed of sound in a medium:
A) Tone of the Wave
B) Time of the Wave
C) Properties of the Medium
D) Amplitude of the Wave

Q84) When the angle between the force and the displacement is 90, the work done is __________:
A) Neutral
B) Negative
C) Zero
D) Positive

Q85) ________ is the change in velocity per unit time:
A) Acceleration
B) Momentum
C) Force
D) Inertia

Q86) When speed of an object exceeds the velocity of sound, then it is said to be moving with ______ speed:
A) Subsonic Speed
B) Supersonic Speed
C) Ultrasonic Speed
D) None of These

Q87) Ultrasound is used to detect ________ in metal blocks:
A) Metal heat
B) Cracks and Flaws
C) Metal Opacity
D) Metal Heaviness

Q88) Water exists as _______ in its solid state:
A) Ice
B) Clouds
C) Foam
D) Steam

Q89) 18 Volts= ________ × 3 Ohms:
A) 6 Amperes
B) 6 Watts
C) 6 Milliamperes
D) 6 Joules

Q90) Solar energy __________ generates more power than wind energy:
A) Sometimes
B) Always
C) Never
D) Often

Q91) Plasma is formed in stars due to _________:
A) High Temperature
B) High Pressure
C) Low Temperature
D) None of These

Q92) _________ waves include visible light waves, X-rays, gama rays, radio waves, microwaves, ultraviolet and infrared waves:
A) Mechanical
B) Magnetic
C) Electromagnetic
D) Electric

Q93) Which of the following is not a characteristic of sound waves:
A) Velocity
B) Nature
C) Wavelength
D) None of These

Q94) Echocardiogram is used in __________:
A) Bioelectricity
C) X-rays
D) None of These

Q95) Which of the following lamp has the highest energy efficiency:
A) LED
B) CFL
C) Arc Lamp
D) None of These

Q96) The minimum speed required by a spacecraft to escape the gravitational pull is ________:
A) 6 Miles/sec
B) 7 Km/sec
C) 7 Miles/sec
D) 10 Miles/sec

Q98) Acceleration due to gravity (g)= ___________:
A) G/MR²
B) GR²/M
C) GM/R²
D) GM/R

Q99) Mechanical energy is equal to:
A) Kinetic + Chemical Energy
B) Kinetic + Potential Energy
C) Kinetic + Heat Energy
D) Kinetic + Electrical Energy

Q100) If a plane travels a distance of 4000 M with the work done of 2000 J, then the force applied is:
A) 5 N
B) 10 N
C) 25 N
D) 50 N

Q101) What is the physical state of water at 12°C:
A) Liquid
B) Solid
C) Ionic
D) None of These

Q102) What is the lowest freezing point of mercury:
A) 0°C
B) -4°C
C) -39°C
D) -69°C

Q103) Which of the following places has the highest value of g:
A) Mt. Everest
B) The Equator
C) Somewhere in Antarctica
D) None of These

Q104) When pressure is increased in a gas cylinder, its mass will ___________:
A) Increase
B) Decrease
C) Both A and B
D) Remain Unchanged

Q105) Angstrom is a unit of expressing ________:
A) Time
B) Mass
C) Length
D) Force

Q106) The focus distance of a convex lens is 0.25 cm. Its capacity will be:
A) 2D
B) -2D
C) 4D
D) -4D

Q107) A ball falls from a height of 20 m and then bounces back up to a height of 10 m. The loss of energy is:
A) 5%
B) 25%
C) 50%
D) 75%

Q108) If a bulb of 100 W is burnt for 5 hours daily, then how much will it cost in 30 days at the rate of 50 paise per unit:
A) 7.50
B) 9.50
C) 11.50
D) 13.50

Q109) When the sound moves, it carries _________ with it:
A) Mass
B) Energy
C) Potential Difference
D) None of These

Q110) Secondary cells are those, which _____________:
A) Can’t be Recharged
B) Can be Recharged
C) Can be Used Only Once
D) Both B and C

Q111) Photovoltaic cells are:
A) Solar Cell
B) Thermal Cell
C) Sulphur Cell
D) Molar Cell

Q112) Which of the following radiation types has the most energy:
A) Visible Rays
B) Ultraviolet
C) X-rays
D) None of These

Q113) The pressure inside a soap bubble is:
A) Higher than the Atmospheric Pressure
B) Less than the Atmospheric Pressure
C) Equal Atmospheric Pressure
D) Half of the Atmospheric Pressure

Q114) What portion of the iceberg is above the surface of the sea while floating in the sea:
A) 1/4
B) 1/6
C) 1/9
D) 1/10

Q115) __________×__________= Force:
A) Mas and Velocity
B) Mass and Acceleration
C) Weight and Velocity
D) Weight and Heat

Q116) If a person stands on a sensitive scale and takes a deep breath, then the scale’s reading will:
A) Increase
B) Decrease
C) No Effect on the Reading
D)  None of These

Q117) The weight of an object falling freely under the gravity is __________:
A) Maximum
B) Minimum
C) Constant
D) Variable

Q118) In which of the following medium the speed of sound will be maximum at a temperature of about 20°C:
A) Air
B) Granite
C) Water
D) Iron

Q119) Sound is produced by ___________:
A) Vibrating Objects
B) Moving Objects
C) Talking Phone
D) Swinging Bodies

Q120) If a toy car of 300 gm runs at a speed of 10 m/s, then the momentum will be:
A) 3 Kg.m/s
B) 5 Kg.m/s
C) 14 Kg.m/s
D) 29 Kg.m/s

Q121) Heat can be transferred by convection in _________:
A) Solid and Liquid
B) Solid and Vaccum
C) Vaccum and Gas
D) Gas and Liquid

Q122) Changing the amount of the matter _________ will remain unchanged:
A) Volume
B) Mass
C) Density
D) Weight

Q123) If the distance between two masses is reduced to half, then how many times the gravitational force increases between them:
A) 4 Times
B) 5 Times
C) 6 Times
D) 7 Times

Q124) A body absorbs most of the heat when it is:
A) Black and Raugh
B) Black and Smooth
C) White and Raugh
D) White and Smooth

Q125) The Endoscope is based on the principle of:
A) Scattering
B) Total Internal Reflection
C) Both A and B
D) None of These

Q126) Mesons are found in _________:
A) Cosmic Rays
B) Gama Rays
C) X-rays
D) Leaser Beam

Q127) Which of these parts of the ear response to sound waves like a microphone’s diaphragm:
A) Pinna
B) Lobe
C) Fluid in the Inner Ear
D) Eardrum

Q128) Which of the following is generally used to reduce reverberation in an auditorium as sound absorbents:
A) Compressed Fibreboard
B) Rough Plaster
C) Draperies
D) All of These

Q129) How many colours does sunlight consist of:
A) Two
B) Three
C) Five
D) Seven

Q130) The velocity of a particle located at the centre of a pipeline will be:
A) Maximum
B) Minimum
C) Zero
D) None of These

Q131) The incident angle for a beam going through the centre of curvature of a concave mirror will be:
A) 0°
B) 60°
C) 90°
D) 180°

Q132) At what point does the Fahrenheit temperature double:
A) -6.7°C
B) -12°C
C) 118°C
D) 160°C

Q133) A convex lens has a focal length of 20cm. Its power in dioptre is:
A) 2
B) 5
C) -7
D) -9

Q134) Light enters eye through a transparent membrane known as __________:
A) Cornea
B) Pupil
C) Retina
D) None of These

Q135) If the force of 3N is applied to a 50 kg object, then what will be the velocity of the object after 4 sec:
A)  0.24 m/s
B) 0.36 m/s
C) 0.68 m/s
D) 1.03 m/s

Q136) In which of the following medium sound will travel with greater speed at 0°C:
A) Water
B) Hydrogen
C) Aluminium
D) All of These

Q137) _______________ waves are used in echocardiography:
A) Ultrasonic
B) Infrasonic
C) Between 20 to 2000 hz
D) None of These

Q138) The length of a person is 6 feet. The minimum height of a vertical mirror to see the full image in the mirror is:
A) 2 feet
B) 3 feet
C) 4 feet
D) None of These

Q139) Due to the ____________ we see the sun a few minutes before the actual sunrise:
A) Scattering of Light
B) Diffraction of Light
C) Refraction of Light
D) Both A and C

Q140) The pendulum clock can be run at high speed in _______:
A) Summer
B) Winter
C) Spring
D) Rainy Season

Q141) How much work is done to carry a 2-coulomb charge between two points, which has a potential difference of 5 volts:
A) 0.4 Joule
B) 2.5 Joule
C) 10 Joule
D) 20 Joule

Q142) Identify the odd colour from the following:
A) Green
B) Brown
C) Red
D) Yellow

Q143) Kepler’s first law is known as the law of _________:
A) Ellipse
B) Harmonies
C) Motion
D) Equal Area

Q144) ____________ is an example of gravitational potential energy:
A) A Moving Car
B) Bullet Fired from a Gun
C) Dam Water
D) None of These

Q145) __________ waves are also known as heat waves:
A) X-rays
B) Gamma Rays
C) Light Waves
D) Infrared Waves

Q146) The English physicist James P. Joule outlined the basis of the _________:
A) Principle of Conversation
B) Phenomenon of Gravitation
C) Theory of Vibrating Receptacle
D) None of These

Q147) A source produces ten crests and ten troughs in 0.1 sec. What is the frequency of the wave produced:
A) 100Hz
B) 108Hz
C) 118Hz
D) 140Hz

Q148) Weber per second is equivalent to _________:
A) Coulomb
B) Volt
C) Ohm
D) Ampere

Q149) 30°C is equal to ________ Kelvin (Approximately):
A) -30
B) 130
C) -243
D) 300

Q150) MHO is the unit of _________ of a substance:
A) Conductance
B) Resistivity
C) Conductivity
D) None of These

Q151) The difference in temperature between the two bodies is 30° centigrade. What is the difference in Fahrenheit:
A) 54
B) 64
C) 68
D) 85

Q152) Which Greek letter denotes wavelength:
A) Epsilon
B) Mu
C) Omega
D) Lambda

Q153) The absolute refractive index of air is:
A) 1.03
B) 1.003
C) 1.0003
D) None of These

Q154) What is the standard room temperature on the Kelvin scale:
A) 198K
B) 210K
C) 273K
D) 298K

Q155) Identify the use of the Isotopes in uranium:
A) Fuel in Nuclear Reactor
B) Treatment of Goitre
C) Treatment of Cancer
D) Fuel in Aeroplanes

Q156) The ability to do work is referred to as _________:
A) Pressure
B) Force
C) Energy
D) None of These

Q157) Which of the following principles is involved in all the electric appliances such as electric irons, toasters, electric kettles, hair
dryers etc:
A) Resistance in Circuit
B) Current Passing in Series
C) Heating Effect of Current
D) Generation of Electric Current

Q158) In which of the following two ways can resistance be combined:
A) Series and Parallel
B) Serial and Across
C) Line and Across
D) Straight and Between

Q159) The mass of an atom resides in _________ of the atom:
A) Nucleus
B) Vacant Space
C) Electron Cloud
D) Proton Cloud

Q160) Which of the following is directly proportional to the potential difference:
A) Current
B) Time
C) Resistivity
D) Power

Q161) __________ is an aperture which controls light passage in the eye:
A) Sclerotic Coat
B) Pupil
C) Iris
D) Blind Spot

Q162) The resistance of a metallic wire _______ with the increase in temperature:
A) Decrease
B) Increase
C) No Change
D) Sometimes Increases and Decreases

Q163) Sound is recorded in water with the help of _____:
A) Hydrophone
B) Megaphone
C) Microphone
D) Loudspeaker

Q164) Which of the following properties doesn’t change when electromagnetic waves pass from one medium to another:
A) Frequency
B) Speed
C) Wavelength
D) All of These

Q165) Asteroids are found between the orbits of _____ and ______.
A) Mars and Earth
B) Earth and Venous
C) Mars and Jupiter
D) Jupiter and Uranus

Q166) The resistance of an ideal ammeter is _______, whereas that of an ideal voltmeter is ________:
A) Zero and Infinity
B) Two and Zero
C) One and Infinity
D) None of These

Q167) ________ is used to measure humidity:
A) Anemometer
B) Barometer
C) Hygrometer
D) None of These

Q168) Which of the following radioactive isotopes is used to control Leukemia:
A) Carbon 14
B) Cobalt 60
C) Hydrogen 3
D) Uranium 235

Q169) The introduction of impurities into a semiconductor crystal for modification of conductivity is known as ________:
A) Dilution
B) Formation
C) Doping
D) Mixing

Q170) Which of the following allows direct current to pass through it but obstructs the path of alternating current:
A) Choke Coil
B) Electric Coil
C) Dynamo
D) All of These

Q171) The instrument which is used for taking photographs of the sun in light of one wavelength only is known as ________:
A) Spectrophotometer
B) Bifocal Camera
C) Spectroheliograph
D) Voltmeter

Q172) The study of sound is called _________:
A) Acoustics
B) Musicology
C) Cymatics
D) None of These

Weber

Yellow

3.08 km/sec