TOP 100 Physics MCQS
All Questions for: TOP 100 Physics MCQS
Question 1: What is the ratio of the velocity of sound at 4 atmosphere to that at 1 atmosphere?
- A 1 : 2
- B 2 : 1
- C 4 : 1
- D 1 : 1
Explanation:
Question 2: Holes can exist in____________________?
- A Semi conductors
- B Insulators
- C All of the above
- D Conductors
Explanation:
Question 3: The mass of Platinum cylinder kept near Paris is________?
- A 100 Kg
- B 1 gram
- C 1 Kg
- D None
Explanation:
Question 4: When fluid is incompressible then________________?
- A The volume of the fluid is constant
- B The flow of the fluid is the straight line
- C The velocity of the fluid is constant
- D The density of the fluid is constant
Explanation:
Question 5: The distance covered by a body in one complete vibration is 20cm. What is the amplitude of body ___________________?
- A 5 cm
- B 15 cm
- C 7.5 cm
- D 10 cm
Explanation:
Question 6: How many types of units are in SI ?
- A 3
- B 1
- C 4
- D 2
Explanation:
Question 7: If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb________________?
- A Brightness increases
- B No light
- C Brightness decreases
- D Remains same
Explanation:
Question 8: The circumference subtends an angle________________?
- A ?/2 radian
- B 4? radian
- C 2? radian
- D ? radian
Explanation:
Question 9: In which quadrant, the only value of tan will be positive ?
- A Both 1st and 3rd
- B Third
- C First
- D Second
Explanation:
Question 10: Which of the following group of forces can produce equilibrium?
- A 4N ,2N, 10N
- B 10N, 18N
- C 12N, 5N, 20N
- D 12N, 5N, 15N
Explanation:
Question 11: The waveform of S.H.M. is________________?
- A Square wave
- B Standing wave
- C None
- D Sine wave
Explanation:
Question 12: Which of the following statements is true when we see
- A The Sun remains behind us and we face raindrops
- B The sky remains clear and the sun is at lower position in the sky
- C In light rainfall, we face Sun
- D We face sun and raindrops
Explanation:
Question 13: Three coplanar forces acting on a body keep it in equilibrium. They should therefore be_______________?
- A Non-parallel
- B Non-concurrent
- C Parallel
- D Concurrent
Explanation:
Question 14: The purpose of flywheel in the engines is________________?
- A to smooth out the energy variation
- B to add more weight to engine to work it stable
- C to start engine
- D both A and B
Explanation:
Question 15: Which equation is not dimensionally correct ?
- A Vf=Vi+at
- B S=1/2at2
- C E=mc2
- D S=Vt2
Explanation:
Question 16: Tick the correct statement_________________?
- A Moderators slow down the neutrons
- B Moderators bring the neutrons to rest
- C Moderators reflect the neutrons
- D Moderators absorb the neutrons
Explanation:
Question 17: Dimensional analysis is helpful for__________________?
- A Verification of laws
- B Only A and B are correct
- C Checking the homogeneity of a physical equation
- D Deriving a possible formula
Explanation:
Question 18: The most useful tracer is_________________?
- A I-131
- B Sr-90
- C C-14
- D CA-41
Explanation:
Question 19: The displacement of SHM is written as X = X`sin?t if the displacement is written by X = X? sont then phase constant will be equal to_______________?
- A 45
- B 90
- C 180
- D 0
Explanation:
Question 20: If the momentum of an object is increased twice, then what will be the kinetic energy?
- A Twice
- B Four times
- C Sixteen times
- D Thrice
Explanation:
Question 21: Oil rises up to wick in a lamp because_____________?
- A Diffusion of oil through the wick
- B Capillary action phenomenon
- C Oil is volatile
- D Oil is very light
Explanation:
Question 22: If the pressure of a given gas is held constant its density is inversely proportional to its absolute temperature. We can refer it as another statement of______________?
- A Charles law
- B Ideal gas law
- C Avagadros law
- D Boyles law
Explanation:
Question 23: A photon is always considered to be: ________?
- A Moving with speed of light
- B At rest
- C In accelerated form
- D Moving with speed of sound
Explanation:
Question 24: When a body moves in a circle of radius r with linear speed V its centripetal force is_______________?
- A mV/r2
- B mV/r
- C mV2/r2
- D mV2/r
Explanation:
Question 25: Two vectors A and B are making angle ? with each other. The scalar projection of vector B on vector A is written as____________?
- A A.B/B
- B A.B/A
- C Both a and b are correct
- D A.cos?
Explanation:
Question 26: Magnifying power of simple microscope______________?
- A increase with decrease in focal length
- B increase with increase in focal length
- C list distance of distinct vision
- D no effect with decrease or increase with focal length
Explanation:
Question 27: Alpha particles possess greater penetration power than that of beta particles due to its_____________?
- A Neither greater nor smaller ionization power
- B Greater ionization power
- C Smaller ionization power
- D Same ionization power
Explanation:
Question 28: The unit of entropy is________________?
- A J.K
- B N.m/sec
- C Kgm2/sec2.K
- D J/K
Explanation:
Question 29: Area under the curve of velocity-time graph gives_______?
- A Force
- B Momentum
- C Acceleration
- D Displacement
Explanation:
Question 30: An alternating current is represented by the equation I = I?sin?t which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ?
- A I = 2ISin?t
- B I = 2I?Sin(?t/2)
- C I = I?sin(2?t)
- D I = 2I?Sin(2?t)
Explanation:
Question 31: Davison Germer experiment indicates__________________?
- A Electron diffraction
- B Interference
- C Refraction
- D Polarization
Explanation:
Question 32: Ohm is a unit of measuring _________?
- A None of these
- B Resistance
- C Current
- D Voltage
Explanation:
Question 33: A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes up to 2 in height further, find the magnitude of the force. Consider g = 10m/s 2
- A 16N
- B 20N
- C 22N
- D 4N
Explanation:
Question 34: Absolute uncertainty in a measurement depends upon______________?
- A The magnitude of the measurement
- B Percentage error in the measurement
- C All of a, b and C
- D Least count of the instrument
Explanation:
Question 35: Very weak magnetic fields are detected by___________________?
- A Squids
- B Magnetic resonance imaging (MRI)
- C Oscilloscope
- D Magnetometer
Explanation:
Question 36: The performance of a refrigerator is described by________________?
- A coefficient of performance
- B efficiency
- C both A and B
- D not described
Explanation:
Question 37: A body of 2 kg is suspended from the ceiling of an elevator moving up with an acceleration g. Its apparent weight in the elevator will be______________?
- A 19.6 N
- B 9.8 N
- C 39.2 N
- D 129.4 N
Explanation:
Question 38: A simple pendulum suspended from the ceiling of a lift has time period T when the lift is at rest. When the lift falls freely, the time period is_________________?
- A Zero
- B T/g
- C g/T
- D Infinite
Explanation:
Question 39: The operation of a transistor requires______________?
- A That the emitter be heated
- B None of the above
- C That the collector be heated
- D That the base be heated
Explanation:
Question 40: Dimension of pressure is__________________?
- A ML-2T-2
- B MLT
- C ML-1T-1
- D ML-1T-2
Explanation:
Question 41: An alpha particle can produce fluorescence in__________________?
- A Barium platinocyanide
- B ZnS
- C All of above
- D Calcium tungstate
Explanation:
Question 42: Maximum number of rectangular components are_____________?
- A 1
- B 2
- C 4
- D 3
Explanation:
Question 43: In an electron microscope, we use energetic particles because of______________?
- A Penetrating power is high
- B All the above reasons
- C Wavelength is very short
- D Kinetic energy is large
Explanation:
Question 44: Electrons present in p-type material due to thermal pair generation are_____________?
- A minority carriers
- B blockers
- C majority carriers
- D dual carriers
Explanation:
Question 45: What is the acceleration of free fall on the moon of that on the Earth ?
- A 1/4th
- B None of these
- C 1/6th
- D 1/8th
Explanation:
Question 46: After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light______________?
- A Remains same
- B Decreases because speed decreases
- C Increases then decrease
- D Increases because wavelength decreases
Explanation:
Question 47: The projection of the particle moving in a circle with non-uniform speed executes ?
- A Vibratory motion
- B S.H.M
- C Both B and D
- D None S.H.M
Explanation:
Question 48: Prefix deca represents_______________?
- A 10 Raised to power -1
- B 10 Raised to power 1
- C 10 Raised to power 3
- D 10 Raised to power 2
Explanation:
Question 49: ML-1 T-2 is the dimension of_______________?
- A Force
- B Momentum
- C Pressure
- D Energy
Explanation:
Question 50: The direction of propagation of an electromagnetic waves is________________?
- A Parallel to electric and magnetic field
- B Perpendicular to electric field
- C Perpendicular to both electric and magnetic field
- D Perpendicular to magnetic field
Explanation: