100+ Most Important Physics Gk Questions And Answers
Questions for Assam Competitive Examination, ইতিহাসৰ প্ৰশ্ন, Assam Art & Culture Questions, Assam History Question, Assam Geography Question, Questions for Assam Police Examination, PNRD Examination Questions, General Polity Handloom and Textile Examination Questions, DHS Assam, Agriculture Department Examination Questions, Questions for Grade IV Examination, Questions for Junior Assistant Examination, Questions for Grade III Examination, Assam Police, Questions for Sericulture Examination, Questions for SSC GD Preparation, SSC GD old Question paper, SSC GD Mock Test.
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:
- 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
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
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
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