TOP 100 Physics MCQS
All Questions for: TOP 100 Physics MCQS
Question 451: A uniform steel wire of length 4m and area of cross-section 3
- A 0.50J
- B 0.100J
- C 0.75J
- D 0.025J
Explanation:
Question 452: Which quantity is a state function_______________?
- A volume
- B pressure
- C internal energy
- D heat supply
Explanation:
Question 453: As a result of annihilation of electron and positron, number of ?
- A Three
- B Two
- C One
- D Four
Explanation:
Question 454: If a car moves with a uniform speed of 2 ms-1 in a circle of radius 0.4. Its angular speed is______________?
- A 2.8 ms-1
- B 4 rad. S-1
- C 5 rad. S-1
- D 1.6 rad. S-1
Explanation:
Question 455: A magnetic compass will be deflected if it is kept near a____________________?
- A both
- B charge in motion
- C charge at rest
- D none
Explanation:
Question 456: When the amplitude of a wave becomes double its energy become_________________?
- A Four times
- B One half
- C Double
- D None time
Explanation:
Question 457: The direction of a vector in space is specified by_______________?
- A One angle
- B Three angle
- C No angle
- D Two angle
Explanation:
Question 458: Coercive force is the force which opposes ____________________?
- A Surface cracking
- B Extension
- C Breakage
- D Demagnetization
Explanation:
Question 459: If we look at the floating piece of iceberg on the sea, approximately what fraction of it is visible above the seawater level?
- A 1/8th
- B 1/6th
- C None of these
- D 1/10th
Explanation:
Question 460: In a semiconductors the charge carriers are ___________________?
- A All of the above
- B Holes only
- C Electrons only
- D Electron and holes both
Explanation:
Question 461: The cross product i^ x j^ is equal to_______________?
- A k^
- B Zero
- C One
- D i^
Explanation:
Question 462: SI unit of flux density is____________________?
- A NmA-1
- B NAm-1
- C NA-1m-1
- D NmA-2
Explanation:
Question 463: A magnetic field___________________?
- A always exerts a force on a charged particle
- B never exerts a force on a charged particles
- C exerts a force if the charged particle is moving in the direction of the magnetic field lines
- D exerts a force if the charged particle is moving perpendicular to the magnetic field lines
Explanation:
Question 464: The radius of geostationary orbit from the centre of the earth is nearly______________?
- A 18000 km
- B 42000km
- C 24000 km
- D 36000km
Explanation:
Question 465: In obtaining an X-ray photograph of our hand we use the principle of______________?
- A any of above
- B shadow photograph
- C ionization
- D photo electric effect
Explanation:
Question 466: Study of sound is called _____________?
- A Soundlogy
- B Neurology
- C Physiology
- D Acoustics
Explanation:
Question 467: The unit vector in the direction of vector A = 2 i^ -2j^ + k^ is_______________?
- A (2i^
- B (2i^
- C 2i^
- D (2i^
Explanation:
Question 468: A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?
- A R+1/2?fL
- B (R2+f2L2)
- C (R+2?fL)
- D (R2+4?2f2L2)
Explanation:
Question 469: Unit of G is ______________?
- A None
- B Nm2Kg-2
- C Nm2Kg
- D Nm2Kg2
Explanation:
Question 470: A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________?
- A independent mass m
- B directly proportional to B
- C directly proportional to q
- D directly proportional to m
Explanation:
Question 471: Pair production cannot take place in a vacuum as ________________?
- A Energy is not conserved
- B The chargee is not conserved
- C Momentum is not conserved
- D Mass is not conserved
Explanation:
Question 472: Value of permeability of free space in SI units is___________________?
- A 4?x10-10 WbA-1m-1
- B 4?x10-8 WbA-1m-1
- C 4?x10-9 WbA-1m-1
- D 4?x10-7 WbA-1m-1
Explanation:
Question 473: For what displacement the P.E becomes 1/4 of its maximum value ?
- A x = x
- B x = x(2)
- C x = x
- D x = x
Explanation:
Question 474: In cricket when a bowler produce reverse swing the ball will move towards______________?
- A The seam of the ball
- B The shinning side of the ball
- C Goes straight
- D Rough side
Explanation:
Question 475: The least count of Vernier caliper is ________ containing 10 Vernier scale divisions?
- A 0.001mm
- B 0.01mm
- C 0.0001mm
- D 0.1mm
Explanation:
Question 476: Which instrument is used to detect path of visible rays?
- A None of the above
- B Geiger counter
- C Wilson Cloud Detector
- D Solid State Detector
Explanation:
Question 477: The critical speed of an artificial satellite is_______________?
- A 8.1 Kms-1
- B 8 ms-1
- C 8 Kms-1
- D 7.9 Kms-1
Explanation:
Question 478: The energy absorbed by a body is __________________ at resonance?
- A Minimum only
- B Maximum only
- C Maximum as well minimum
Explanation:
Question 479: Newton
- A Accelerated frame of reference
- B None
- C Non-inertial frame of reference
- D Inertial frame of reference
Explanation:
Question 480: Matter itself has energy called ________?
- A Nuclear energy
- B Rest energy
- C Chemical energy
- D Potential energy
Explanation:
Question 481: An artificial satellite revolves round the Earth in circular orbit, which quantity remains constant?
- A Angular Momentum
- B None of the above
- C Linear Velocity
- D Angular Displacement
Explanation:
Question 482: The direction of the vector product is given by______________?
- A Right-hand rule
- B Triangular rule
- C Left-hand rule
- D Head to tail rule
Explanation:
Question 483: When a projectile moves upward , its vertical component of velocity?
- A Remains same
- B increase
- C Decrease
- D None of these
Explanation:
Question 484: A particle having the mass of an electron and the charge of a proton is called a______________?
- A Positron
- B Photon
- C Antiproton
- D Gamma rays
Explanation:
Question 485: Number of significant figures in 0.0173 is_________________?
- A 5
- B 2
- C 4
- D 3
Explanation:
Question 486: Radioactivity is a ______ (A) Spontaneous activity (B) Chemical property_____________?
- A C & A
- B A & B
- C B & C
- D A B & C
Explanation:
Question 487: Farad is the unit of___________?
- A capacitance
- B voltage
- C None of these
- D inductance
Explanation:
Question 488: A vector can be multiplied by a number. The number may be_______________?
- A All A, B and C are correct
- B Dimensionless
- C Dimensional scalar
- D Negative
Explanation:
Question 489: In Compton scattering, the change in wavelength is maxed if_______________?
- A The angle of scattering is 0
- B The angle of scattering is 180
- C The angle of scattering is 90
- D The angle of scattering is 60
Explanation:
Question 490: Which of the following is a good moderator?
- A Cadmium
- B Ordinary Water
- C Helium
- D Graphite
Explanation:
Question 491: Electrical resonance is observed in_______________?
- A Neither in radio nor in a microwave oven
- B Radio
- C Both in radio and microwave oven
- D Microwave oven
Explanation:
Question 492: The span of the broad jump depends upon_______________?
- A Height of jump
- B None
- C Angle of projection
- D Mass of the jumper
Explanation:
Question 493: The sharpness of resonance is__________________?
- A Inversely proportional to the damping force
- B Directly proportional to the damping force
- C Equal to the square of damping force
- D Equal to the square of damping force
Explanation:
Question 494: The planet nearest to the earth is______________?
- A Venus
- B Sun
- C Mercury
- D Uranus
Explanation:
Question 495: Coefficient of viscosity of honey is greater than______________?
- A Water
- B Milk
- C Water
- D Charcoal
Explanation:
Question 496: Average translational kinetic energy per molecule of an ideal gas is given by_____________?
- A 2NaT/3
- B 3Na/2RT
- C 3RT/2Na
- D 3NaT/2R
Explanation:
Question 497: What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N ?
- A 100A
- B 10A
- C 1000A
- D 1A
Explanation:
Question 498: If one or more of the neutrons emitted during fission cab be used to build up further fission then the reaction is self-sustained and is known as __________________?
- A Chain reaction
- B Fission reaction
- C Fusion reaction
- D Chemical reaction
Explanation:
Question 499: In the nucleus of uranium, the number of neutrons will be _____________?
- A 92
- B Different for different isotopes
- C 235
- D 143
Explanation:
Question 500: Michelson calculated the speed of light using the instruments______________?
- A spectrometer
- B galvanometer
- C none of these
- D interferometer
Explanation: