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?
- by nuclear fission
- By Oxygen
- by ionization
- by nuclear fusion
Correct Ans: D. By nuclear fusion
Q2.Einstein was awarded the Nobel Prize-
- to the theory of special relativity
- to Bose-Einstein statistics
- for the photoelectric effect
- to the theory of specific heats
Correct Ans: C. For photoelectric effect
Q3. The beam of light which is extremely directional is called-
- Messer
- laser
- eraser
- grazer
Correct Ans: B. Laser
Q4. Photovoltaic cells are-
- Sulfur Cell
- molar cell
- Solar Cell
- Thermal Cell
Correct Ans: C. Solar Cell
Q5.Laser (LASER) beam is always-
- Parallel Beam
- initially parallel and later diverging
- converging beam
- diverging beam
Correct Ans: D. Diverging Beam
Q6. What is the conductivity of superconductor?
- zero
- more
- Unlimited
- less
Correct Ans: C. Unlimited
Q7.The nucleus of an atom consists of-
- neutron and electron
- Electron only
- protons and neutrons
- Protons and Electrons
Correct Ans: C. Proton and Neutron
Q8.Which of the following is not an electromagnetic wave?
- Ultrasonic Waves
- thermal radiation
- X-rays
- light
Correct Ans: A. Ultrasonic Waves
Q9.Neutron was discovered-
- Chadwick
- Newton
- Rutherford
- Thomson
Correct Ans: A. Chadwick
Q10.Super conductor is a substance-
- which conduct electricity at high temperature
- which give high resistance to the flow of electric current
- which give minimum barrier to the flow of electric current
- 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?
- neutron
- alpha particle
- Proton
- Electron
Correct Ans: A. Neutron
Q12.Which of the following particles are moving with the same kinetic energy?
- Douton
- x-particle
- Electron
- Proton
Correct Ans: C. Electron
Q13. What is the mass number of an element whose atom has two protons, two newtons and two electrons?
- 6
- 8
- 2
- 4
Correct Ans: D. 4
Q14. All atoms in a laser emit light waves?
- of the same dimension
- of the same art
- of the same shape
- all of the above
Correct Ans: D. All of the above
Q15. What is the size of the nucleus?
- 10^-13 m
- 10^-15 m
- 10^-10 m
- 10^-9 m
Correct Ans: B. 10^-15 m
Q16.Who invented the first thermionic valve?
- J.A.Fleming
- Lee DeForest
- Thomas Edison
- Richardson
Correct Ans: A. J.A. Fleming
Q17.Who discovered the positron?
- Chadwick
- Anderson
- Rutherford
- Thomson
Correct Ans: B. Anderson
Q18.The penetrating power of X rays is increased by?
- reducing current in the filament
- Increasing the potential difference between the cathodes
- increasing current in the filament
- 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?
- three
- five
- zero
- one
Correct Ans: D. one
Q20.Renewable energy source in stars is the reason for?
- decay of radioactive materials
- Excess of oxygen which helps in burning and generates energy
- conversion of hydrogen to helium
- Conversion of Helium to Hydrogen
Correct Ans: C. Conversion of Hydrogen to Helium
Q21.Electron was discovered?
- Galileo
- Rutherford
- Thomson
- James Watt
Correct Ans: C. Thomson
Q22.What is the application of following engines?
- in frosty illustrations
- In superconductivity research
- in the rocket
- Atomic Furnace
Correct Ans: C. in the rocket
Q23.Atomic number of an element is the number of………….?
- electrons in the nucleus
- Protons in the nucleus
- Newton in the nucleus
- none of these
Correct Ans: B. Protons in the nucleus
Q24.Auto Han discovered the atom bomb on the basis of the following principle-
- alpha radiation
- Gamma Radiation
- uranium fragments
- Nucleus fission
Correct Ans: C. Uranium fragments
Q25.Atoms contain protons?
- in orbit
- both in nucleus and orbital
- within the nucleus
- outside the nucleus
Correct Ans: C. Within the nucleus
Q26. The semiconductor chip used in integrated circuit is made of?
- Silicone
- Zircon
- Beryllium
- Carbon
Correct Ans: A. Silicone
Q27.electron carries?
- Two Unit Negative Charge
- Two units of positive
- one unit negative charge
- one unit positive
Correct Ans: C. One unit negative charge
Q28. Recently discovered high thermal superconductor?
- Ceramic Oxide
- Inorganic polymer
- Pure rare earth metals
- Alloy
Correct Ans: A. Ceramic Oxide
Q29.Isotopes in atoms-
- Newtons have the same number
- Nucleons have the same number
- protons have the same number
- all is true
Correct Ans: C. protons have the same number
Q30.How do stars get their energy?
- by chemical action
- by gravity
- as a result of nuclear combination
- from nuclear fission
Correct Ans: C. As a result of nuclear combination
Q31.Isotopes are atoms of the same element whose-
- Atomic mass is different but atomic number is same
- Both atomic number and atomic number are the same
- Atomic mass is same but atomic number is different
- None of the above
Correct Ans: A. Atomic mass is different but atomic number is same
Q32.Which metal is used to generate electricity?
- Copper
- aluminum
- Uranium
- iron
Correct Ans: C. Uranium
Q33. Two elements which have different number of electrons but same mass number are called?
- isomer
- Samyutonic
- isotopes
- isobaric
Correct Ans: D. Isobaric
Q34.What can X rays be used for?
- Detection of defects in precious stones and diamonds
- Metal cutting and welding
- detecting gold under the ground
- 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?
- isotopes
- isobar
- isobar
- none of these
Correct Ans: A. Isotopes
Q36.The format of laser is-
- LOCALLY AMPLIFIED STIMULATED EMISSION OF RADIATION
- LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIO
- LONG AMPLIFICATION BY STIMULATED EMISSION OF RADIAITION
- LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION
Correct Ans: D. LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION
Q37.Which element has the most isotopes?
- Hydrogen
- Polonium
- Uranium
- Radium
Correct Ans: B. Polonium
Q38.Can stones be treated without surgery?
- by laser
- by ultrasound
- by X-ray
- by pleuroscopy
Correct Ans: By A. by laser
Q39.Atoms which have same number of protons but different number of neutrons are called what?
- isamutonic
- isotopes
- isobaric
- isomer
Correct Ans: B. Isotopes
Q40.What is photoelectric effect?
- release of protons
- Emission of Newton
- immediate process
- Delayed Process
Correct Ans: C. immediate process
Q41. The process of splitting a heavy nucleus into two lighter nuclei is called?
- mass damage
- radioactive disintegration
- Nuclear Fusion
- 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?
- Radiation Illustration
- Holography
- optical photography
- X ray photography
Correct Ans: B. Holography
Q43.Do the following principle work in atomic bomb?
- Fleming’s law
- photoelectric effect
- Nuclear Fusion
- Nuclear fission
Correct Ans: D. Nuclear fission
Q44.Laser beam is used for?
- In Eye Medicine
- in kidney therapy
- In Cancer Medicine
- In Heart Medicine
Correct Ans: A. In Eye Medicine
Q45.Hydrogen bomb based reactor was created?
- nuclear fission
- On Radioactive Disintegration
- On Nuclear Fusion
- on all of the above
Correct Ans: C. On Nuclear Fusion
Q46.The three dimensional picture is taken by?
- Photochromatic
- radiography
- Holography
- Photography
Correct Ans: C. Holography
Q47.The first nuclear reactor was made?
- Rutherford
- Fermi
- Einstein
- Newton
Correct Ans: B. Fermi
Q48. What is Radar used for?
- Distant objects detection and energy detection
- Synchronous Satellite Detection
- detecting submerged submarines
- receiving signal from radio receiver
Correct Ans: A. Detection of distant objects and energy detection
Q49.The theory of atomic bomb is based on?
- Nuclear fission
- on both of the above
- On Nuclear Fusion
- None of the above
Correct Ans: A. Nuclear fission
Q50. What happens when arsenic atoms are added to germanium lattice?
- Super Conductor
- Intra Semiconductor
- External Semiconductor
- insulator
Correct Ans: C. External Semiconductor
Q51. What is the age of the oldest rock group?
- by Ra-Si method
- by the uranium-lead method
- By K-Ar Method
- by C14 method
Correct Ans: C. By K-Ar Method
Q52. Doordarshan signal cannot be received after a certain distance because-
- absorbs air signals
- Earth’s surface is curved
- signs are weak
- The antenna is hard
Correct Ans: B. Earth’s surface is curved
Q53.Radios emit active substances?
- beta rays
- gamma rays
- alpha rays
- all of the above
Correct Ans: D. All of the above
Q54.Which type of electromagnetic radiation is used for remote control of television?
- Partagon
- view
- infrared
- None of the above
Correct Ans: C. Infrared
Q55. Energy is created on the Sun?
- by oxygen reactions
- by reduction reactions
- by nuclear fission
- by nuclear fusion
Correct Ans: D. By nuclear fusion
Q56.Which of the following metals is used as a semiconductor in transistors?
- graphite
- silver
- Copper
- germanium
Correct Ans: D. germanium
Q57.Which of the following has negative charge?
- β – particle
- γ – particle
- X-ray
- α – particle
Correct Ans: A. β – Particle
Q58.N-P-N transistors are better than P-N-P transistors because-
- the flow of electrons is more in these
- have the ability to tolerate more heat
- cheap
- 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?
- zirconium
- Tungsten
- cobalt
- Nickel
Correct Ans: A. Zirconium
Q60. On the basis of its use in semiconductor suitable impurities are added for?
- enhancing her modus operandi
- make it tolerable to higher voltage
- increasing its electrical conductivity
- 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?
- Sum of the masses of two positons and two neutons
- Two positons because each positon has only one positive charge
- of the two protons
- 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?
- oscillator
- Correctional
- amplifier
- driver
Correct Ans: B. Correctional
Q63.Cobalt-60 is commonly used in radiation therapy because it emits?
- Gamma Rays
- X-rays
- alpha rays
- beta rays
Correct Ans: A. Gamma Rays
Q64. Photoelectric effect is described as the removal of electrons from the metal surface at which position?
- electrons of suitable velocity collide with it
- light of suitable wavelength falls on it
- he’s hot
- 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?
- Cadmium or Boron
- aluminum
- Heavy Water
- Graphite
Correct Ans: A. Cadmium or Boron
Q66. Diode is the device which transmits current to-
- allows to flow in both directions
- does not allow it to flow in any direction
- allows to flow in one direction
- none of the above
Correct Ans: C. allows to flow in one direction
Q67.Where is the atomic pile used?
- In the operation of thermal nuclear fusion
- in atomic acceleration
- in the production of x rays
- 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-
- at normal temperature
- at extremely high temperatures
- at very low temperatures
- The temperature at which the semiconductor becomes
Correct Ans: A. At Normal Temperature
Q69.Curie is the name of whose unit?
- heat
- energy
- Radioactive Righteousness
- Temperature
Correct Ans: C. Radioactive Righteousness
Q70.In the explosion of an atomic bomb a huge amount of energy is released due to?
- Conversion of mechanical energy into nuclear energy
- conversion of newton to proton
- conversion of matter into energy
- Conversion of chemical energy into thermal energy
Correct Ans: C. Conversion of matter into energy
Q71.In nuclear reactor energy is generated?
- by controlled fragmentation
- by uncontrolled fission
- Controlled Fusion by Fusion
- by uncontrolled fusion
Correct Ans: A. by controlled fragmentation
Q72.Coolridge tube is used to produce what?
- X rays
- gamma rays
- radio waves
- Microwaves
Correct Ans: A. X rays
Q73.Why is nuclear fusion also called thermal nuclear reaction?
- Fusion produces a lot of heat
- Fusion reaction takes place in sunlight
- Fusion converts nuclear energy into heat
- 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?
- Photovoltaic cell
- Daniel Sale
- Electrochemical Cell
- Galvain Cell
Correct Ans: A. Photovoltaic cell
Q75.Radio carbon dating is used to find the age of…..?
- Babies
- rocks
- planets
- fossils
Correct Ans: D. Fossils
Q76. What is the conclusion of the mass-energy relation?
- Field Theory of Energy
- Special Theory of Relativity
- Quantum Theory
- General Theory of Relativity
Correct Ans: D. General Theory of Relativity
Q77.What is a nuclear reactor?
- Emitter of U-238
- molecular furnace
- Atomic Bomb Manufacturing Site
- Heavy Water Pond
Correct Ans: B. Molecular Furnace
Q78.How is heavy water used in nuclear reactor?
- preservative
- controller
- diluent
- coolant
Correct Ans: C. diluent
Q79.The age of the earth is determined by which of the following method?
- Bio-Clock Method
- Uranium
- Carbon Dating Method
- Biotech Method
Correct Ans: B. Uranium
Q80.Which of the following is used as a coolant in the fast breeder test reactor at Kalpakkam?
- seawater
- molten sodium
- Carbon Dioxide
- Heavy Water
Correct Ans: B. Molite Sodium