100+ Most Important Physics GK DHS Exam Questions And Answers

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100+ Most Important Physics Gk Questions And Answers

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100+ Most Important Physics GK DHS Exam Questions And Answers

Get Ready With 100+ 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

Ans: B) Invar

Q2) When the red light is exposed on a yellow flower, it will appear ________ in color:

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  • A) Yellow
  • B) Orange
  • C) Black
  • D) Red

Ans: D) Red

Q3) Longitudinal waves can’t travel through:

  • A) Solid
  • B) Vacuum
  • C) Gas
  • D) None of These

Ans: B) Vacuum

Q4) Rose appears red in sunlight, but the same Rose appears __________ in green light:

  • A) Red
  • B) Black
  • C) Green
  • D) Yellow

Ans: B) Black

Q5) The current flowing in one direction is called _______:

  • A) Alternating Current
  • B) Induced Current
  • C) Direct Current
  • D) Ionic Current

Ans: C) Direct Current

Q6) When detergent is added to water, the surface tension will:

  • A) Increases
  • B) Decreases
  • C) No Change
  • D) Become Zero

Ans: B) Decreases

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

Ans: A) L= r×p

Q8) What is the unit of measurement for the universal gravitational constant:

  • A) Nm/Kg²
  • B) Nm²/Kg
  • C) Nm²/Kg²
  • D) Nm²Kg²

Ans: C) Nm²/Kg²

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

Ans: C) Newton’s Third Law

Q10) Tesla is a unit of magnetic ________:

  • A) Flux
  • B) Induction
  • C) Moment
  • D) Field

Ans: B) Induction

Q11) Doppler’s effect is associated with:

  • A) Electric Current
  • B) Light
  • C) Heat
  • D) Sound

Ans: D) Sound

Q12) What is the unit of noise pollution:

  • A) Decibel
  • B) Decimal
  • C) ppm
  • D) Hertz

Ans: A) Decibel

Q13) Temperatures in centigrade and Fahrenheit are the same at:

  • A) 32°
  • B) 40°
  • C) -40°
  • D) -273°

Ans: C) -40°

Q14) Butter paper is an example of a ______ object:

  • A) Transparent
  • B) Translucent
  • C) Opaque
  • D) Luminous

Ans: B) Translucent

Q15) Which of the following is not a part of the AC generator:

  • A) Slip Rings
  • B) Coil
  • C) Commutator
  • D) Galvanometer

Ans: C) Commutator

Q16) What is the measuring unit for the length of light waves:

  • A) Barrel
  • B) Angstrom
  • C) Knot
  • D) Carat

Ans: B) Angstrom

Q17) A magnifying glass comprises a simple:

  • A) Convex Lens
  • B) Convex Mirror
  • C) Concave Lens
  • D) None of These

Ans: A) Convex Lens

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

Ans: A) 5:3

Q19) Plank constant has the dimensions of:

  • A) Energy
  • B) Linear Momentum
  • C) Angular Momentum
  • D) Force

Ans: A) Energy

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

Ans: C) 1.4 Times the Mass of the Sun

Q21) What is the complete form of RADAR:

  • A) Radio Detecting and Ranging
  • B) Radio Device and Ranging
  • C) Radio Detects and Range
  • D) Region Device and Ranging

Ans: A) Radio Detecting and Ranging

Q22) The rate of change in displacement over time is called _______:

  • A) Acceleration
  • B) Speed
  • C) Velocity
  • D) None of These
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Ans: C) Velocity

Q23) The _______ lens is thick at the middle and thin at the edges:

  • A) Concave
  • B) Convex
  • C) Bifocal
  • D) None of These

Ans: B) Convex

Q24) Which of the following metals has the greatest thermal and electrical conductivity:

  • A) Silver
  • B) Copper
  • C) Iron
  • D) None of These

Ans: A) Silver

Q25) The Tyndall effect is due to:

  • A) Scattering of Light
  • B) Dispersion of Light
  • C) Refraction of Light
  • D) Reflection of Light

Ans: A) Scattering of Light

Q26) Fulminology is the study of:

  • A) Volcanic Eruptions
  • B) Lightening
  • C) Natural Gases
  • D) Atmosphere

Ans: B) Lightening

Q27) Which of the following statements is always true:

  • A) Displacement > Distance
  • B) Displacement < Distance
  • C) Displacement = Distance
  • D) None of These

Ans: B) Displacement < Distance

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

Ans: B) Doppler Effect

Q29) The velocity of sound doesn’t affect:

  • A) Heat
  • B) Medium
  • C) Pressure
  • D) Humidity

Ans: C) Pressure

Q30) Curie is a unit of:

  • A) Current
  • B) Voltage
  • C) Luminous Intensity
  • D) Radioactivity

Ans: D) Radioactivity

Q31) A diode is used for:

  • A) Modulation
  • B) Oscillation
  • C) Amplification
  • D) Rectification

Ans: D) Rectification

Q32) The scientist associated with flotation is:

  • A) Archimedes
  • B) Newton
  • C) Louis Pasteur
  • D) None of These

Ans: A) Archimedes

Q33) The unit of Viscosity is:

  • A) Poise
  • B) Pascal
  • C) Poiseuille
  • D) None of These

Ans: C) Poiseuille

Q34) Acceleration is inversely proportional to:

  • A) Force
  • B) Velocity
  • C) Mass
  • D) Distance

Ans: C) Mass

Q35) Which among the following waves can’t be polarized:

  • A) Sound
  • B) Radio
  • C) Infrared
  • D) Ultraviolet

Ans: A) Sound

Q36) What is the frequency of direct current:

  • A) 50 Hz
  • B) 60 Hz
  • C) Zero
  • D) Infinite

Ans: C) Zero

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

Ans: A) Increase

Q38) Which of the following is used in the oven:

  • A) X-Rays
  • B) UV Rays
  • C) Microwaves
  • D) Radio Waves

Ans: C) Microwaves

Q39) Who enunciated the laws of planetary motion:

  • A) Nicolaus Copernicus
  • B) Johannes Kepler
  • C) Issac Newton
  • D) Galileo

Ans: B) Johannes Kepler

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

Ans: B) Zener Diode

Q41) Gamma rays can cause:

  • A) Gene Mutation
  • B) Sneezing
  • C) Burning
  • D) Fever

Ans: A) Gene Mutation

Q42) Hydraulic machines work on the principle of:

  • A) Newton’s Law
  • B) Joule’s Law
  • C) Pascal’s Law
  • D) Flotation Law

Ans: C) Pascal’s Law

Q43) Name the commercial unit of electric energy:

  • A) Kwh
  • B) Ampere
  • C) Volt
  • D) Ohm

Ans: A) Kwh

Q44) One calorie is equal to:

  • A) 1.284J
  • B) 4.186J
  • C) 6.418J
  • D) 8.146J

Ans: B) 4.186J

Q45) What is the refractive index of a diamond:

  • A) 1.44
  • B) 1.47
  • C) 1.77
  • D) 2.42

Ans: D) 2.42

Q46) The upward force on a floating body is called ______:

  • A) Jerk
  • B) Buoyancy
  • C) Archimedal Force
  • D) Anti Gravity

Ans: B) Buoyancy

Q47) Which colour is formed when Yellow and Cyan are mixed:

  • A) Red
  • B) Green
  • C) Blue
  • D) White

Ans: B) Green

Q48) _____ are used in RADAR systems:

  • A) Ultraviolet
  • B) Infrared
  • C) Radio Waves
  • D) All of These

Ans: C) Radio Waves

Q49) 10⁴ Fermi is equal to:

  • A) 1 Meter
  • B) 100 Micron
  • C) 1 Angstrom
  • D) 0.1 Angstrom
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Ans: C) 1 Angstrom

Q50) Rad/sec is the unit of:

  • A) Angular Displacement
  • B) Angular Velocity
  • C) Angular Acceleration
  • D) None of These

Ans: B) Angular Velocity

Q51) 1 Micron is equal to:

  • A) 100 mm
  • B) 1000 mm
  • C) 0.01 mm
  • D) 0.001 mm

Ans: C) 0.01 mm

Q52) Which of the following is an auxiliary unit:

  • A) Radian
  • B) Steradian
  • C) Ampere
  • D) Both A and B

Ans: D) Both A and B

Q53) _____ is used to examine the internal parts of our body:

  • A) Microscope
  • B) Periscope
  • C) Odometer
  • D) Endoscope

Ans: D) Endoscope

Q54) Which instrument is used to measure the height or elevation:

  • A) Micrometre
  • B) Telemeter
  • C) Hypsometer
  • D) Tonometer

Ans: C) Hypsometer

Q55) To measure the strength of direct current _____ is used:

  • A) Tachometer
  • B) Spectrometer
  • C) Voltmeter
  • D) Tangent Galvanometer

Ans: 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

Ans: B) Steel>Water>Plastic

Q57) As the temperature increases, the thermal conductivity of the solid metal ______:

  • A) Increases
  • B) Decreases
  • C) Remains Same
  • D) None of These

Ans: B) Decreases

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

Ans: A) Force

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

Ans: C) 0.44 m/s²

Q60) Surface tension depends on:

  • A) Atmospheric Pressure
  • B) Nature of the Liquid
  • C) Temperature of the Liquid
  • D) All of These

Ans: D) All of These

Q61) The matric system is also called:

  • A) CGS
  • B) MKS System
  • C) SI
  • D) None of These

Ans: B) MKS System

Q62) Plane angle and solid angle are:

  • A) Fundamental Quantity
  • B) Derived Quantity
  • C) Supplementary Quantity
  • D) None oy These

Ans: C) Supplementary Quantity

Q63) Which one of the following is not a secondary pigment:

  • A) Green
  • B) Red
  • C) Blue
  • D) Yellow

Ans: 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

Ans: A) Virtual

Q65) What type of spectrum is the rainbow:

  • A) Natural Spectrum
  • B) Artificial Spectrum
  • C) Both A and B
  • D) None of These

Ans: A) Natural Spectrum

Q66) Which of the following has no units:

  • A) Thermal Capacity
  • B) Magnetic Susceptibility
  • C) Angular Acceleration
  • D) None of These

Ans: B) Magnetic Susceptibility

Q67) The primary cause of motion is:

  • A) Velocity
  • B) Acceleration
  • C) Force
  • D) Energy

Ans: C) Force

Q68) Gravitational mass is a _______ quantity:

  • A) Vector
  • B) Scalar
  • C) Tensor quantity
  • D) None of the above

Ans: A) Vector

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

Ans: C) Both A and B

Q70) The force acting on a body is always parallel to:

  • A) Velocity
  • B) Acceleration
  • C) Momentum
  • D) None of the Above

Ans: B) Acceleration

Q71) A body whose momentum is a constant must have a constant:

  • A) Acceleration
  • B) Force
  • C) Velocity
  • D) None of These

Ans: C) Velocity

Q72) The motion of a bicycle wheel is:

  • A) Translatory
  • B) Rotary
  • C) Both A and B
  • D) Curvilinear

Ans: C) Both A and B

Q73) Force × time = _________:

  • A) Momentum
  • B) Impulse
  • C) Force
  • D) None of These

Ans: B) Impulse

Q74) Inertia is proportional to:

  • A) Mass
  • B) Weight
  • C) Length
  • D) Height

Ans: A) Mass

Q75) The dimensional formula of the Planck’s constant is:

  • A) [ML2T-2]
  • B) [MLT]
  • C) [M2L2T3]
  • D) [ML2T-1]

Ans: D) [ML2T-1]

Q76) Light cannot be polarized by:

  • A) Reflection
  • B) Diffraction
  • C) Refraction
  • D) All of These
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Ans: B) Diffraction

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

Ans: 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

Ans: A) √2

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

Ans: B) 4 Sec

Q80) Electric wires are generally coated with:

  • A) Polypropylene
  • B) Polyvinyl Chloride
  • C) Polyurethane
  • D) Polyethylene

Ans: B) Polyvinyl Chloride

Q81) The presence of free ___________ in a substance makes it a conductor of electricity:

  • A) Positrons
  • B) Protons
  • C) Electrons
  • D) Neutrons

Ans: C) Electrons

Q82) During fog we cannot see because of:

  • A) Reflection
  • B) Internal Reflection
  • C) Refraction
  • D) Scattered Light

Ans: 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

Ans: C) Properties of the Medium

Q84) When the angle between the force and the displacement is 90, the work done is __________:

  • A) Neutral
  • B) Negative
  • C) Zero
  • D) Positive

Ans: C) Zero

Q85) ________ is the change in velocity per unit time:

  • A) Acceleration
  • B) Momentum
  • C) Force
  • D) Inertia

Ans: A) Acceleration

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

Ans: B) Supersonic Speed

Q87) Ultrasound is used to detect ________ in metal blocks:

  • A) Metal heat
  • B) Cracks and Flaws
  • C) Metal Opacity
  • D) Metal Heaviness

Ans: B) Cracks and Flaws

Q88) Water exists as _______ in its solid state:

  • A) Ice
  • B) Clouds
  • C) Foam
  • D) Steam

Ans: A) Ice

Q89) 18 Volts= ________ × 3 Ohms:

  • A) 6 Amperes
  • B) 6 Watts
  • C) 6 Milliamperes
  • D) 6 Joules

Ans: A) 6 Amperes

Q90) Solar energy __________ generates more power than wind energy:

  • A) Sometimes
  • B) Always
  • C) Never
  • D) Often

Ans: A) Sometimes

Q91) Plasma is formed in stars due to _________:

  • A) High Temperature
  • B) High Pressure
  • C) Low Temperature
  • D) None of These

Ans: A) High Temperature

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

Ans: C) Electromagnetic

Q93) Which of the following is not a characteristic of sound waves:

  • A) Velocity
  • B) Nature
  • C) Wavelength
  • D) None of These

Ans: B) Nature

Q94) Echocardiogram is used in __________:

  • A) Bioelectricity
  • B) Radiation
  • C) X-rays
  • D) None of These

Ans: B) Radiation

Q95) Which of the following lamp has the highest energy efficiency:

  • A) LED
  • B) CFL
  • C) Arc Lamp
  • D) None of These

Ans: A) LED

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

Ans: C) 7 Miles/sec

Q98) Acceleration due to gravity (g)= ___________:

  • A) G/MR²
  • B) GR²/M
  • C) GM/R²
  • D) GM/R

Ans: C) GM/R²

Q99) Mechanical energy is equal to:

  • A) Kinetic + Chemical Energy
  • B) Kinetic + Potential Energy
  • C) Kinetic + Heat Energy
  • D) Kinetic + Electrical Energy

Ans: B) Kinetic + Potential 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

Ans: A) 5 N

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