Physics MCQs 5

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MCQ's from Physics for FSC pre engineering and pre medical for Board of Intermediate and Secondary education. Also For Entry Test Preparation for UET, NUST, PIEAS, GIKI, AIR, FAST, WAH University, UHS, other engineering Universities and Medical Colleges.

A source of a magnetic field is
  1. An isolated magnetic pole
  2. A static electric charge
  3. A  moving electric charge
  4. None of these

The magnetic effect of current was discovered by
  1. Oersted
  2. Farady
  3. Bohr
  4. ampere

The due to long straight wire carrying a current I is proportional to
  1. I
  2. I –
  3. Square root I
  4. I3

The4 SI units of magnetic permeability is
  1. Wb /m2z
  2. Wb/mA
  3. WbA/m
  4. Wbm/A
Magnetic field inside a solenoid is
  1. Directly proportional to current
  2. Inversely proportional to current
  3. Directrly proiportioanl to its length
  4. Inverseluy proportional to total no. of turns
A long solenoid has 20 turns/cm. the current necessary to produce a magnetic field of 20 milli tesla inside the solenoid is approximately
  1. 1A
  2. 2A
  3. 4A
  4. 8A

Ion of different momenta having the same charge, enter normally a uniform magnetic field the radius of the orbit of an ion is proportional to
  1. P
  2. 1/P
  3. P2
  4. 1/P2

    A straight current carrying conductor experiences maximum force in a uniform magnetic field when it is placed
    1. Parallel to the field
    2. Perpendicular to field
    3. At na angle of 45 to the filed
    4. None of he above

      The force F experienced by a conductor of length L carrying current when placed in  uniform magnetic field B is given by the relation
      1. F = ILxB
      2. F = IL.B
      3. F = IL/B
      4. F = Lx B/I

        Telsla is the unit of
        1. Magnetic induction ofr flux density
        2. Self inductance
        3. Magnetic flux
        4. None of these

          Total number of lines of magnetic induction passing normally through a given area is called
          1. Magnetic induction
          2. Flux density
          3. Magnetic flux
          4. Magnetic force


            The SI units of magnetic flux is
            1. Weber
            2. N/mA
            3. Tesla
            4. Gauss

              Magnetic flux and flux density are related by
              1. Flux density = flux X area
              2. Flux density = flux /area
              3. Flux density = flux – area
              4. None of these

                The SI unit of flux density is
                1. Weber- m2
                2. Tesla
                3. N/mA
                4. All of them

                  Which of the following is scalar?
                  1. Magnetic flux
                  2. Flux density
                  3. Emf
                  4. Both a and c


                    The magnetic field inside the solenoid along its axis due to current is
                    1. Zero
                    2. Non uniform
                    3. Infinite line
                    4. Strong and uniform

                      Lenz’s law is a consequence of the law of conservation of
                      1. Charge
                      2. Mass
                      3. Momentum
                      4. Energy

                        The force experienced by a charged particle moving with velocity V in a magnetic field B is
                        1. F = q V.B
                        2. F= VX B/q
                        3. Q(VXB)
                        4. None of these

                          The force experienced by a charged particle moving in a magnetic field will be maximum when it moves
                          1. Parallel to the field
                          2. Anti parallel to its direction of motion
                          3. Perpendicular to the field
                          4. At and angle of 45 to the field

                            The direction of force experienced by a charged particle moving in magnetic field will be
                            1. Parallel ot the field
                            2. Opposite to the field
                            3. Parallel to its direction of motion
                            4. Perpendicular to both the field and the velocity vector

                              The Lorentz force or a charged particle moving in an electric flux F and magnetic filed B is given
                              1. F = Fe +Fb
                              2. F = Fe – Fb
                              3. F =  Fe/Fb
                              4. F = fe X Fb

                                The force experienced by an electron projected in a magnetic field B with a velocity V is given by
                                1. F = eVXB
                                2. F = -e V X B
                                3. F = e B X V
                                4. Both b and c

                                  Charge to mass ratio (e/m) of a charged particle is also called its
                                  1. Specific charge
                                  2. Specific force
                                  3. Gyro magnetic ratio
                                  4. Magneto mechanical ratio

                                    Which one of the following cannot be measure with an avometer?
                                    1. Voltage (V)
                                    2. Inductance (H)
                                    3. Resistance (ohm)
                                    4. Current (A)

                                    Which one of the following particles projected perpendicular to a uniform magnetic field with 
                                      the same velocity will be deflected least?
                                      1. Electron
                                      2. Proton
                                      3. Deuteron
                                      4. None of these

                                      A positively charged particle is moving perpendicular to a uniform magnetic field the magnetic force makes the particle to move along
                                      1. An elliptical path
                                      2. A circular path
                                      3. A parabolic path
                                      4. None of these

                                        The working of all DC electric meters (galvanometers, ammeters and voltmeters) depends upon
                                        1. Heating effect of current
                                        2. Chemical eff3ect of current
                                        3. Magnetic field of current
                                        4. Electromagnetic effect of current

                                          According to Faraday’s law of electromagnetic induction
                                          1. Electric field is produced by time varying magnetic flux
                                          2. Magnetic field is produced by time varying electric flux
                                          3. Magnetic field is associated with a moving charge
                                          4. None of the above

                                            A magnetic field
                                            1. Always exerts a force on a charged particle
                                            2. Never exerts a force on a charged particle
                                            3. Exerts a force on a charged particle if it is moving across the magnetic lines of force
                                            4. Exerts a force on a charged particle if it is moving along the magnetic lines of force

                                              Magnetic permeability is maximum for
                                              1. Diamagnetic substances
                                              2. Paramagnetic substances
                                              3. Ferromagnetic substances
                                              4. All of these

                                                The magnetic field used in a moving coil galvanometer is
                                                1. Longitudinal
                                                2. Radial
                                                3. Transverse
                                                4. Non of these

                                                  The galvanometer constant of a moving coil galvanometer is given by
                                                  1. K = BAN/C
                                                  2. K = BN/Ca
                                                  3. K = NAC/B
                                                  4. K = C/BAN

                                                    If the value of galvanometer constant k =C/BAN is made small the galvanometer can be made
                                                    1. Sensitive
                                                    2. Accurate
                                                    3. Stable
                                                    4. None of these

                                                      When a suitable small resistance is put in parallel with the galvanometer coil, it is converted
                                                      1. Voltmeter
                                                      2. Avometer
                                                      3. Ammmerter
                                                      4. None of these

                                                        A small parallel resistance (shunt) used to convert a galvano0meter into an ammeter of suitable rang is given by
                                                        1. Rs = lg/l + lg X Rg
                                                        2. Rs = lg/l – lg X rg
                                                        3. Rs = l + lg/lg X Rg
                                                        4. Rs = lg/l-lg – Rs

                                                          To increase the range of ammeter, the shunt value should be
                                                          1. Decreased
                                                          2. Increased
                                                          3. Kept constant and Rg should be increased
                                                          4. None of these

                                                            When a high resistance is connected in series with the galvanometer coil, it is converted into
                                                            1. Voltmeter
                                                            2. Avometer
                                                            3. Digital meter ammeter
                                                            4. Ammeter

                                                              To increase the measuring range of a voltmeter, the series resistance should be
                                                              1. Increased
                                                              2. Decreased
                                                              3. Kept constant and Rg should be increased
                                                              4. None of these

                                                                Flow of a current at right angled to the filed per meter length of conductor will produce a 
                                                                  magnetic strength of
                                                                  1. 1 Gauss
                                                                  2. 1 Tesla
                                                                  3. 1 joule
                                                                  4. Newton

                                                                  Magnetic flux is
                                                                  1. 0.25 Wb
                                                                  2. 0.25 T
                                                                  3. 2 Wb
                                                                  4. 2T

                                                                  I am Mechatronics and Control Engineer from UET, Lahore. Helping Engineering students gives me pleasure.

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