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12th Standard English Medium Physics Subject Creative 1 Mark Questions with Solution Part - I

12th Standard

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Physics

Time : 00:30:00 Hrs
Total Marks : 10
    10 x 1 = 10
  1. The value of constant 'K' in coulomb law is _____________.

    (a)

    0.9 x 109 Nm2 C2

    (b)

    9 x 10-9 Nm2C2

    (c)

    9 x 109 Nm-2 C-2

    (d)

    9 x 109 Nm2 C-2

  2. An electron gun in a TV shoots out a beam of electrons. The beam current is 10\(\mu\)A. The charge that strikes the screen in 1 minute is ______________.

    (a)

    \(+600\mu C\)

    (b)

    \(-600\mu C\)

    (c)

    \(+10\mu C\)

    (d)

    \(-10\mu C\)

  3. The direction of the magnetic force on a positive charge moving in a magnetic field is given by ________________.

    (a)

    thumb rule

    (b)

    left hand rule

    (c)

    right hand rule

    (d)

    cork screw rule

  4. When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic field at its center will become _____________.

    (a)

    four times

    (b)

    same

    (c)

    half

    (d)

    double

  5. An emf of 12V is induced when the current in the coil changes at the rate of 40 A S-1. The coefficient of self-induction of the coil is _______________.

    (a)

    0.3 H

    (b)

    0.003 H

    (c)

    30 H

    (d)

    4.8 H

  6. Speed of electromagnetic waves through vacuum is equal to ______________.

    (a)

    \(\sqrt { { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \)

    (b)

    \(\frac { 1 }{ \sqrt { { \mu }_{ 0 }{ \varepsilon }_{ 0 } } } \)

    (c)

    \(\\ \frac { \sqrt { { \mu }_{ 0 } } }{ { \varepsilon }_{ 0 } } \)

    (d)

    \(\sqrt { \frac { { \varepsilon }_{ 0 } }{ { \mu }_{ 0 } } } \)

  7. An object is at a distance of 0.5 in front of a plane mirror. Distance between the object and image is ___________.

    (a)

    0.5 m

    (b)

    1m

    (c)

    7

    (d)

    8

  8. Photo electron effect supports quantum nature of light because ___________.

    (a)

    there is a minimum frequency which no photo electrons are emitted

    (b)

    the maximum kinetic energy of photo electrons depends only one the frequency of light and not in intensity

    (c)

    even when the metal surface is faintly illuminated the photoelectrons leave the surface immedietly

    (d)

    All the above

  9. Electron microscope employ magnetic lenses of _______ focal lengths to obtain large magnification.

    (a)

    short

    (b)

    long

    (c)

    infinite

    (d)

    zero

  10. An a-particle of energy 10 meV is scattered through 180o by a fixed uranium nucleus. The distance of the closest approach is of the order of _____________.

    (a)

    (b)

    10-10 cm

    (c)

    10-12 cm

    (d)

    10-15 cm

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