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Physics 12 ISC

Quiz by Chetna Thakkar

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40 questions
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  • Q1

    A power transmission line feeds input power at 2300 V to a step-down transformer with its primary windings having 4000 turns. The number of turns in the secondary in order to get output power at 230 V .

    400 

    4000

    40

    10s
  • Q2

    We need to step-up the voltage for power transmission, so that_______

    the power is increased before transmission is done

    the current is reduced and consequently, the I R2loss is cut down

    the voltage is decreased so V R 2/ losses are reduced

    the voltage is increased, the power losses are also increased

    10s
  • Q3

    An AC generator can be converted into DC generator by__________.

    connecting commutator

    reducing turns of coil

    removing commutator

     reversing the magnetic field

    10s
  • Q4

    Given three equal resistors, how many different combinations (taken all of them together) can be made?

    3

     4

     5

     6

    45s
  • Q5

    An incandescent light bulb takes some time to heat up and produce light, whereas afluorescent tubelight instantly lightens up. Which of the following device is used to achieve fast action of tubelight?

    Choke coil

    Capacitor bank

    Thermostat

     Rheostat

    10s
  • Q6

    Mutual inductance between two magnetically coupled coils, depend on(a) 

    All of the above

     number of turns of the coils 

    cross-sectional area of their common core

    nature of material

    10s
  • Q7

    Which of the following is not an element of earth’s magnetic field? 

     Horizontal component of earth’s magnetic field

    Angle of declination

    Angle of dip

    Angle of repose

    10s
  • Q8

    The direction of magnetic moment in a bar magnet is given by which of the following directions?

     None of these

     N → S 

    Both (a) and (b) 

    S → N 

    10s
  • Q9

    In the equation AB = C, A is the current density, C is the electric field, Then B is_____.

    conductivity

    resistance

    potential difference

     resistivity

    10s
  • Q10

    How many different resistances are possible with two equal resistors?

    4

    2

    3

     5

    10s
  • Q11

    When a glass rod rubbed with silk is brought near the gold leaf electroscope, the leaves diverge. What is the nature of charge on the leaves? 

    Either positive or negative

    Negative 

    Zero

    Positive

    10s
  • Q12

    Which of the following statement is correct for equipotential surfaces for uniform electric field? 

     Equipotential surface is always spherical in shape.

     Electric lines of force are perpendicular to equipotential surface.

    Work done in moving a charge on equipotential surface is always negative.(d)

    Two equipotential surfaces intersect each other at acute angles

    10s
  • Q13

    A cell of emf 1.5 V having a finite internal resistance is connected to a load resistance of2W. For maximum power transfer, the internal resistance of the cell should be___ 

     None of these

    0 5. W 

    4 W  

    2 W 

    10s
  • Q14

    A potentiometer is an accurate and versatile device to make electrical measurement of emf because the method involves______.

    a condition of no current flow through the galvanometer

     potential gradients

    a combination of cells, galvanometer and resistances

    cells

    10s
  • Q15

     An electron and a-particle with equal momentum enters perpendicularly into uniform magnetic field, then___________.

    path of both particles will be a straight line

    path of electron will be more curved than that of a-particle(c)

    path of a-particle will be more curved than that of electron

     path of both particles will be equally curved 

    10s

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