TOP 100 Physics MCQS
All Questions for: TOP 100 Physics MCQS
Question 101: Which one of following band is completely filled in case of conductors ?
- A Fermi band
- B Valence band
- C Forbidden band
- D Conduction band
Explanation:
Question 102: The value of R ( Universal Gas Constant ) = ___________?
- A 1.314 J/mole K
- B 10.314 J/mole K
- C 8.314 J/mole K
- D 6.5
Explanation:
Question 103: Intensity level of threshold of pain is: _____________?
- A 80 db
- B 100 db
- C 120 db
- D 60 db
Explanation:
Question 104: When a body is moving along a circular path it covers a certain angle in a given interval of time. Such type of motion is__________________?
- A Angular motion
- B Vibratory motion
- C Linear motion
- D Rotatory motion
Explanation:
Question 105: A chimney works best if air exposed to the chimney is______________?
- A Stationary
- B Moving slowly
- C Moving
- D Moving fast
Explanation:
Question 106: Terminal velocity is given by equation_______________?
- A Vt = gr2?
- B Vt = gr2/9?
- C Vt = 2gr2/9?
- D Vt = 9gr2/2?
Explanation:
Question 107: Neutron and proton are commonly known as______________?
- A Boson
- B Meson
- C Quartz
- D Nucleon
Explanation:
Question 108: Tesla is the unit for measuring:
- A Magnetic induction
- B Magnetic moment
- C Magnetic intensity
- D None of the above
Explanation:
Question 109: Which one of the following of glass can cut ultraviolet rays?
- A Jena Glass
- B Soda Glass
- C Crookes Glass
- D Pyrex Glass
Explanation:
Question 110: Petrol engine is a________________?
- A all the above
- B SI engine
- C IC engine
- D C.I engine
Explanation:
Question 111: The minimum distance between an object and its real image in a convex lens is_____________?
- A 2.5 f
- B 4f
- C 3f
- D 2 f
Explanation:
Question 112: Which of the following waves have smallest velocity in vacuum?
- A Sound
- B Infra-Red
- C Ultraviolet
- D Micro
Explanation:
Question 113: The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________?
- A 60
- B 90
- C 30
- D 120
Explanation:
Question 114: The total energy of a body executing S.H.M is directly proportional to________________?
- A Square of an amplitude
- B The amplitude
- C The square root of amplitude
- D Reciprocal of amplitude
Explanation:
Question 115: Addition of vector obeys_____________?
- A All given laws in A, B and C
- B Distributive law
- C Associative law
- D Commutative law
Explanation:
Question 116: In forward bias the width of potential barrier_____________?
- A No effect
- B Remains same
- C Increases
- D Decreases
Explanation:
Question 117: For what value of
- A Both A & B
- B 2
- C 4
- D -2
Explanation:
Question 118: Mohus scale is used for to measure ____________?
- A Pressure
- B Hardness
- C Humidity
- D Temperature
Explanation:
Question 119: The instrument used to measure blood pressure is called____________?
- A Sphygmomanometer
- B Sonometer
- C Venturimeter
- D Blood pressure
Explanation:
Question 120: In hydrogen spectrum which one of the following series lies in the ultraviolet region ?
- A Pfund series
- B Bracket series
- C Lymann series
- D Balmer series
Explanation:
Question 121: Geostationary satellite completes one rotation around the earth in_______________?
- A 6 hours
- B 3 hours
- C 24 hours
- D 12 hours
Explanation:
Question 122: What is wavelength of visible spectrum?
- A 8500
- B 7800
- C 3900
- D 1300
Explanation:
Question 123: A photon is________________?
- A A quantum of electromagnetic radiation
- B A unit of energy
- C A unit of wavelength
- D A positively charged particle
Explanation:
Question 124: The reverse of LED is______?
- A Resistor
- B Photodiode
- C Capacitor
- D Diode
Explanation:
Question 125: Who were the pioneers of Physics?
- A Egyptians
- B Greek
- C Persians
- D Latin
Explanation:
Question 126: Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________?
- A 0.2
- B 0.5
- C 2
- D 1
Explanation:
Question 127: How many days would be in a year if the distance between the earth and the sun were reduced to half of its present value (assuming circular orbit) ?
- A 365 days
- B 730 days
- C 329 days
- D 129 days
Explanation:
Question 128: Which of the following is not a correct representation method for prefixes______________?
- A 1mm
- B 1000um
- C 10km
- D Both A and B
Explanation:
Question 129: A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes:
- A on the blind spot
- B on the retina
- C in front of the retina
- D behind the retina
Explanation:
Question 130: It is easier to turn a steering wheel with both hands than with a single hand because______________?
- A Two forces act on the wheel
- B Two hands provide a firm grip
- C The couple acts on the wheel
- D Accelerating force increases on the wheel
Explanation:
Question 131: Electric current in a solid metal conductor is caused by the movement of what ?
- A Metal ions
- B Electrons
- C Protons
- D Metal atoms
Explanation:
Question 132: The simplest type of rectification known as half wave rectification is obtained by____________________?
- A suppressing the harmonics in A.C voltage
- B using a Coolidge tube
- C suppressing half wave of A.C supply by using diode
- D using a transistor
Explanation:
Question 133: Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in______________?
- A One increases whereas that in the other decreases
- B Each increase
- C Each decrease
- D Each remains the same
Explanation:
Question 134: Einstein
- A 1/2 mvmax2-hf = ?
- B All of above are correct
- C 1/2 mvmax2=hf+?
- D 1/2 mvmax2=hf-?
Explanation:
Question 135: The number 76.85 is rounded off up to two significant figures as_____________?
- A None of these
- B 77
- C 76.9
- D 76.8
Explanation:
Question 136: Numerical value of Boltzmanns constant is______________?
- A 3.18
- B 1.38
- C 1.38
- D 3.18
Explanation:
Question 137: The back emf of a motor which is just started is_________?
- A Minimum
- B Optimum
- C Maximum
- D Zero
Explanation:
Question 138: Which one is a unit vector ?
- A Both B and C are correct
- B 1/??3 i^ + 1/??3 j^ +1/ ??3 k^
- C ??3 i^ + ??3 j^ + ??3 k^
- D ??3 / 3 i^ + ??3 / 3 j^ + ??3 / 3 k^
Explanation:
Question 139: A 10? electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?
- A 110V
- B 220V
- C 220 ?2V
- D 220/ 2V
Explanation:
Question 140: Strontium-90 is used as __________________?
- A ?-particle source
- B ?-particle source
- C ?-rays source
- D Neutron source
Explanation:
Question 141: In any measurement the significant figures are______________?
- A All accurately known and all doubtful digits
- B Only doubtful digits
- C Only accurately known digits
- D All accurately known digits and the first doubtful digit
Explanation:
Question 142: Gravitation force of earth is___________?
- A 7.21 m/s
- B 1.62 m/s
- C 9.80 m/s
- D None of these
Explanation:
Question 143: Semi-conductor germanium and silicon are_________________?
- A trivalent
- B divalent
- C pentavalent
- D tetravalent
Explanation:
Question 144: A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ?
- A 20 m
- B 25 m
- C 15 m
- D 5 m
Explanation:
Question 145: Which one is the dimensionally correct equation ?
- A f=vt
- B V=f/t
- C S=Vit+1/2at2
- D V=St
Explanation:
Question 146: An OP-AMPs can amplify_______________?
- A D.C.
- B A.C.
- C None of the above
- D Both A.C. & D.C.
Explanation:
Question 147: Radiation with wavelength longer than red lights______________?
- A visible radiation
- B X-rays
- C infra red radiation
- D ultraviolet rays
Explanation:
Question 148: Which one of the following is not vector quantity _______?
- A Force
- B Acceleration
- C Displacement
- D Speed
Explanation:
Question 149: A bird sitting on a high tension electric wire does not get electrocuted because:
- A it does not form a closed path for the flow of current
- B the body is earthed
- C Sit has high resistance
- D its feet are good insulators
Explanation:
Question 150: The energy liberated when one atom of U-235 undergoes fission reaction is________________?
- A 200MeV
- B 20MeV
- C 40MeV
- D 30MeV
Explanation: