Gk Question Answer Quiz English

Modern Science Gk Questions Answers English

Top Modern Science Gk Questions Answers In English For All Competitive Exams. You Will Read The Top Question And Answer Related To Modern Science In This Post. This Can Be Asked In Any Competitive Exams, Must Read Once.

Modern Science Gk Questions Answers In English

Q1.The energy of the Sun is produced?

  1. by nuclear fission
  2. By Oxygen
  3. by ionization
  4. by nuclear fusion

Correct Ans: D. By nuclear fusion

Q2.Einstein was awarded the Nobel Prize-

  1. to the theory of special relativity
  2. to Bose-Einstein statistics
  3. for the photoelectric effect
  4. to the theory of specific heats

Correct Ans: C. For photoelectric effect

Q3. The beam of light which is extremely directional is called-

  1. Messer
  2. laser
  3. eraser
  4. grazer

Correct Ans: B. Laser

Q4. Photovoltaic cells are-

  1. Sulfur Cell
  2. molar cell
  3. Solar Cell
  4. Thermal Cell

Correct Ans: C. Solar Cell

Q5.Laser (LASER) beam is always-

  1. Parallel Beam
  2. initially parallel and later diverging
  3. converging beam
  4. diverging beam

Correct Ans: D. Diverging Beam

Q6. What is the conductivity of superconductor?

  1. zero
  2. more
  3. Unlimited
  4. less

Correct Ans: C. Unlimited

Q7.The nucleus of an atom consists of-

  1. neutron and electron
  2. Electron only
  3. protons and neutrons
  4. Protons and Electrons

Correct Ans: C. Proton and Neutron

Q8.Which of the following is not an electromagnetic wave?

  1. Ultrasonic Waves
  2. thermal radiation
  3. X-rays
  4. light

Correct Ans: A. Ultrasonic Waves

Q9.Neutron was discovered-

  1. Chadwick
  2. Newton
  3. Rutherford
  4. Thomson

Correct Ans: A. Chadwick

Q10.Super conductor is a substance-

  1. which conduct electricity at high temperature
  2. which give high resistance to the flow of electric current
  3. which give minimum barrier to the flow of electric current
  4. Jows conduct electricity at low temperatures

Correct Ans: C. Which gives minimum barrier to the flow of electric current

Q11. What is a floating particle in the following?

  1. neutron
  2. alpha particle
  3. Proton
  4. Electron

Correct Ans: A. Neutron

Q12.Which of the following particles are moving with the same kinetic energy?

  1. Douton
  2. x-particle
  3. Electron
  4. Proton

Correct Ans: C. Electron

Q13. What is the mass number of an element whose atom has two protons, two newtons and two electrons?

  1. 6
  2. 8
  3. 2
  4. 4

Correct Ans: D. 4

Q14. All atoms in a laser emit light waves?

  1. of the same dimension
  2. of the same art
  3. of the same shape
  4. all of the above

Correct Ans: D. All of the above

Q15. What is the size of the nucleus?

  1. 10^-13 m
  2. 10^-15 m
  3. 10^-10 m
  4. 10^-9 m

Correct Ans: B. 10^-15 m

Q16.Who invented the first thermionic valve?

  1. J.A.Fleming
  2. Lee DeForest
  3. Thomas Edison
  4. Richardson

Correct Ans: A. J.A. Fleming

Q17.Who discovered the positron?

  1. Chadwick
  2. Anderson
  3. Rutherford
  4. Thomson

Correct Ans: B. Anderson

Q18.The penetrating power of X rays is increased by?

  1. reducing current in the filament
  2. Increasing the potential difference between the cathodes
  3. increasing current in the filament
  4. by reducing the potential difference between cathode and anode

Correct Ans: B. By increasing the potential difference between the cathodes

Q19.Find the number of protons in the nucleus of a hydrogen atom?

  1. three
  2. five
  3. zero
  4. one

Correct Ans: D. one

Q20.Renewable energy source in stars is the reason for?

  1. decay of radioactive materials
  2. Excess of oxygen which helps in burning and generates energy
  3. conversion of hydrogen to helium
  4. Conversion of Helium to Hydrogen

Correct Ans: C. Conversion of Hydrogen to Helium

Q21.Electron was discovered?

  1. Galileo
  2. Rutherford
  3. Thomson
  4. James Watt

Correct Ans: C. Thomson

Q22.What is the application of following engines?

  1. in frosty illustrations
  2. In superconductivity research
  3. in the rocket
  4. Atomic Furnace

Correct Ans: C. in the rocket

Q23.Atomic number of an element is the number of………….?

  1. electrons in the nucleus
  2. Protons in the nucleus
  3. Newton in the nucleus
  4. none of these

Correct Ans: B. Protons in the nucleus

Q24.Auto Han discovered the atom bomb on the basis of the following principle-

  1. alpha radiation
  2. Gamma Radiation
  3. uranium fragments
  4. Nucleus fission

Correct Ans: C. Uranium fragments

Q25.Atoms contain protons?

  1. in orbit
  2. both in nucleus and orbital
  3. within the nucleus
  4. outside the nucleus

Correct Ans: C. Within the nucleus

Q26. The semiconductor chip used in integrated circuit is made of?

  1. Silicone
  2. Zircon
  3. Beryllium
  4. Carbon

Correct Ans: A. Silicone

Q27.electron carries?

  1. Two Unit Negative Charge
  2. Two units of positive
  3. one unit negative charge
  4. one unit positive

Correct Ans: C. One unit negative charge

Q28. Recently discovered high thermal superconductor?

  1. Ceramic Oxide
  2. Inorganic polymer
  3. Pure rare earth metals
  4. Alloy

Correct Ans: A. Ceramic Oxide

Q29.Isotopes in atoms-

  1. Newtons have the same number
  2. Nucleons have the same number
  3. protons have the same number
  4. all is true

Correct Ans: C. protons have the same number

Q30.How do stars get their energy?

  1. by chemical action
  2. by gravity
  3. as a result of nuclear combination
  4. from nuclear fission

Correct Ans: C. As a result of nuclear combination

Q31.Isotopes are atoms of the same element whose-

  1. Atomic mass is different but atomic number is same
  2. Both atomic number and atomic number are the same
  3. Atomic mass is same but atomic number is different
  4. None of the above

Correct Ans: A. Atomic mass is different but atomic number is same

Q32.Which metal is used to generate electricity?

  1. Copper
  2. aluminum
  3. Uranium
  4. iron

Correct Ans: C. Uranium

Q33. Two elements which have different number of electrons but same mass number are called?

  1. isomer
  2. Samyutonic
  3. isotopes
  4. isobaric

Correct Ans: D. Isobaric

Q34.What can X rays be used for?

  1. Detection of defects in precious stones and diamonds
  2. Metal cutting and welding
  3. detecting gold under the ground
  4. detecting heart disease

Correct Ans: A. Detection of defects in precious stones and diamonds

Q35.Atoms which have same atomic number but different atomic mass are called?

  1. isotopes
  2. isobar
  3. isobar
  4. none of these

Correct Ans: A. Isotopes

Q36.The format of laser is-



Q37.Which element has the most isotopes?

  1. Hydrogen
  2. Polonium
  3. Uranium
  4. Radium

Correct Ans: B. Polonium

Q38.Can stones be treated without surgery?

  1. by laser
  2. by ultrasound
  3. by X-ray
  4. by pleuroscopy

Correct Ans: By A. by laser

Q39.Atoms which have same number of protons but different number of neutrons are called what?

  1. isamutonic
  2. isotopes
  3. isobaric
  4. isomer

Correct Ans: B. Isotopes

Q40.What is photoelectric effect?

  1. release of protons
  2. Emission of Newton
  3. immediate process
  4. Delayed Process

Correct Ans: C. immediate process

Q41. ​​The process of splitting a heavy nucleus into two lighter nuclei is called?

  1. mass damage
  2. radioactive disintegration
  3. Nuclear Fusion
  4. nuclear fission

Correct Ans: D. Nuclear fission

Q42.The relationship between the interference of two light rays emanating from a laser or any other coherent light source to form a three dimensional image is called a correlation?

  1. Radiation Illustration
  2. Holography
  3. optical photography
  4. X ray photography

Correct Ans: B. Holography

Q43.Do the following principle work in atomic bomb?

  1. Fleming’s law
  2. photoelectric effect
  3. Nuclear Fusion
  4. Nuclear fission

Correct Ans: D. Nuclear fission

Q44.Laser beam is used for?

  1. In Eye Medicine
  2. in kidney therapy
  3. In Cancer Medicine
  4. In Heart Medicine

Correct Ans: A. In Eye Medicine

Q45.Hydrogen bomb based reactor was created?

  1. nuclear fission
  2. On Radioactive Disintegration
  3. On Nuclear Fusion
  4. on all of the above

Correct Ans: C. On Nuclear Fusion

Q46.The three dimensional picture is taken by?

  1. Photochromatic
  2. radiography
  3. Holography
  4. Photography

Correct Ans: C. Holography

Q47.The first nuclear reactor was made?

  1. Rutherford
  2. Fermi
  3. Einstein
  4. Newton

Correct Ans: B. Fermi

Q48. What is Radar used for?

  1. Distant objects detection and energy detection
  2. Synchronous Satellite Detection
  3. detecting submerged submarines
  4. receiving signal from radio receiver

Correct Ans: A. Detection of distant objects and energy detection

Q49.The theory of atomic bomb is based on?

  1. Nuclear fission
  2. on both of the above
  3. On Nuclear Fusion
  4. None of the above

Correct Ans: A. Nuclear fission

Q50. What happens when arsenic atoms are added to germanium lattice?

  1. Super Conductor
  2. Intra Semiconductor
  3. External Semiconductor
  4. insulator

Correct Ans: C. External Semiconductor

Q51. What is the age of the oldest rock group?

  1. by Ra-Si method
  2. by the uranium-lead method
  3. By K-Ar Method
  4. by C14 method

Correct Ans: C. By K-Ar Method

Q52. Doordarshan signal cannot be received after a certain distance because-

  1. absorbs air signals
  2. Earth’s surface is curved
  3. signs are weak
  4. The antenna is hard

Correct Ans: B. Earth’s surface is curved

Q53.Radios emit active substances?

  1. beta rays
  2. gamma rays
  3. alpha rays
  4. all of the above

Correct Ans: D. All of the above

Q54.Which type of electromagnetic radiation is used for remote control of television?

  1. Partagon
  2. view
  3. infrared
  4. None of the above

Correct Ans: C. Infrared

Q55. Energy is created on the Sun?

  1. by oxygen reactions
  2. by reduction reactions
  3. by nuclear fission
  4. by nuclear fusion

Correct Ans: D. By nuclear fusion

Q56.Which of the following metals is used as a semiconductor in transistors?

  1. graphite
  2. silver
  3. Copper
  4. germanium

Correct Ans: D. germanium

Q57.Which of the following has negative charge?

  1. β – particle
  2. γ – particle
  3. X-ray
  4. α – particle

Correct Ans: A. β – Particle

Q58.N-P-N transistors are better than P-N-P transistors because-

  1. the flow of electrons is more in these
  2. have the ability to tolerate more heat
  3. cheap
  4. Energy dissipation is less in these

Correct Ans: A. the flow of electrons is more in these

Q59.Which one of the following is essential in the construction of a nuclear reactor?

  1. zirconium
  2. Tungsten
  3. cobalt
  4. Nickel

Correct Ans: A. Zirconium

Q60. On the basis of its use in semiconductor suitable impurities are added for?

  1. enhancing her modus operandi
  2. make it tolerable to higher voltage
  3. increasing its electrical conductivity
  4. increasing its electrical resistivity

Correct Ans: C. Increase its electrical conductivity

Q61.Alpha particle has two unit positive charge, its mass is approximately equal to?

  1. Sum of the masses of two positons and two neutons
  2. Two positons because each positon has only one positive charge
  3. of the two protons
  4. of an atom of helium

Correct Ans: D. of an atom of helium

Q62. When two semiconductors of type p and n are brought in contact, the p-n junction they form acts as?

  1. oscillator
  2. Correctional
  3. amplifier
  4. driver

Correct Ans: B. Correctional

Q63.Cobalt-60 is commonly used in radiation therapy because it emits?

  1. Gamma Rays
  2. X-rays
  3. alpha rays
  4. beta rays

Correct Ans: A. Gamma Rays

Q64. Photoelectric effect is described as the removal of electrons from the metal surface at which position?

  1. electrons of suitable velocity collide with it
  2. light of suitable wavelength falls on it
  3. he’s hot
  4. put it in a strong electric field

Correct Ans: B. Light of suitable wavelength should fall on it

Q65. Which of the following is used as a neutron controller in a nuclear reactor?

  1. Cadmium or Boron
  2. aluminum
  3. Heavy Water
  4. Graphite

Correct Ans: A. Cadmium or Boron

Q66. Diode is the device which transmits current to-

  1. allows to flow in both directions
  2. does not allow it to flow in any direction
  3. allows to flow in one direction
  4. none of the above

Correct Ans: C. allows to flow in one direction

Q67.Where is the atomic pile used?

  1. In the operation of thermal nuclear fusion
  2. in atomic acceleration
  3. in the production of x rays
  4. Nuclear fission in vogue

Correct Ans: D. Nuclear fission in vogue

Q68. At what temperature can superconductivity be of great economic importance leading to savings of lakhs of rupees-

  1. at normal temperature
  2. at extremely high temperatures
  3. at very low temperatures
  4. The temperature at which the semiconductor becomes

Correct Ans: A. At Normal Temperature

Q69.Curie is the name of whose unit?

  1. heat
  2. energy
  3. Radioactive Righteousness
  4. Temperature

Correct Ans: C. Radioactive Righteousness

Q70.In the explosion of an atomic bomb a huge amount of energy is released due to?

  1. Conversion of mechanical energy into nuclear energy
  2. conversion of newton to proton
  3. conversion of matter into energy
  4. Conversion of chemical energy into thermal energy

Correct Ans: C. Conversion of matter into energy

Q71.In nuclear reactor energy is generated?

  1. by controlled fragmentation
  2. by uncontrolled fission
  3. Controlled Fusion by Fusion
  4. by uncontrolled fusion

Correct Ans: A. by controlled fragmentation

Q72.Coolridge tube is used to produce what?

  1. X rays
  2. gamma rays
  3. radio waves
  4. Microwaves

Correct Ans: A. X rays

Q73.Why is nuclear fusion also called thermal nuclear reaction?

  1. Fusion produces a lot of heat
  2. Fusion reaction takes place in sunlight
  3. Fusion converts nuclear energy into heat
  4. Fusion requires extremely high temperature conditions

Correct Ans: D. Fusion requires extremely high temperature conditions

Q74.Which device is used to convert solar energy into electricity?

  1. Photovoltaic cell
  2. Daniel Sale
  3. Electrochemical Cell
  4. Galvain Cell

Correct Ans: A. Photovoltaic cell

Q75.Radio carbon dating is used to find the age of…..?

  1. Babies
  2. rocks
  3. planets
  4. fossils

Correct Ans: D. Fossils

Q76. What is the conclusion of the mass-energy relation?

  1. Field Theory of Energy
  2. Special Theory of Relativity
  3. Quantum Theory
  4. General Theory of Relativity

Correct Ans: D. General Theory of Relativity

Q77.What is a nuclear reactor?

  1. Emitter of U-238
  2. molecular furnace
  3. Atomic Bomb Manufacturing Site
  4. Heavy Water Pond

Correct Ans: B. Molecular Furnace

Q78.How is heavy water used in nuclear reactor?

  1. preservative
  2. controller
  3. diluent
  4. coolant

Correct Ans: C. diluent

Q79.The age of the earth is determined by which of the following method?

  1. Bio-Clock Method
  2. Uranium
  3. Carbon Dating Method
  4. Biotech Method

Correct Ans: B. Uranium

Q80.Which of the following is used as a coolant in the fast breeder test reactor at Kalpakkam?

  1. seawater
  2. molten sodium
  3. Carbon Dioxide
  4. Heavy Water

Correct Ans: B. Molite Sodium