1:   The two matellic plates having charges +Q and -Q respectively are situated at some distance apart. If these plates are immersed into a tank of kerosene oil, then the intensity of electric field between them
Options:
  1. will be zero
  2. increases
  3. decreases
  4. remain same

Answer: Option 3

Explanation:

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2:   The unit of permittivity of free space is
Options:
  1. Coulomb / Newton meter
  2. Newton meter ^2 / Coulomb ^2
  3. Coulomb ^2 / Newton meter ^2
  4. none of these

Answer: Option 3

Explanation:

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3:   An electric dipole having charge q and dipole moment p is kept in an uniform electric field. If its dipole moment is along the direction of field, then the force acting on it and its potential energy respectively will be
Options:
  1. 2qE and minimum
  2. qE and pE
  3. zero and minimum
  4. none of these

Answer: Option 3

Explanation:

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4:   A dielectric medium of dielectric constant K is filled between the two charges kept at a certain distance apart, the maximum force acting between the charges is
Options:
  1. decreased K times
  2. increased K times
  3. remains unchanged
  4. none of these

Answer: Option 1

Explanation:

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5:   An isolated hollow sphere is given charge +10uC. If the radius of sphere is 2m, then the electric field at the center of sphere will be
Options:
  1. zero
  2. 5 u cm^-2
  3. 20 u cm^-2
  4. 8 u cm^-2

Answer: Option 1

Explanation:

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6:   A particle of mass m and charge q is at rest in the electric field E. If the particle is released. then the K E acquired by it in travelling the distance y will be
Options:
  1. qEy^2
  2. qE^2y
  3. qEy
  4. q^2Ey

Answer: Option 3

Explanation:

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7:   A point Q is situated on the perpendicular bisector of a dipole of dipole moment p. If the distance r if point Q is much greater than size of dipole, then the electric field at Q will be proportional to the
Options:
  1. p^-1 and r^-2
  2. p and r^-2
  3. p^2 and r^-3
  4. p and r^-3

Answer: Option 4

Explanation:

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8:   An equiconvex lens of glass of focal length 0.1 m is cut along a place perpendicular to principal axis into tow equal parts. The ratio of focal length of new lenses formed is
Options:
  1. 1:1
  2. 1:2
  3. 2:1
  4. 2:1/2

Answer: Option 2

Explanation:

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9:   A symmetric double convex lens is cut in tow equal parts by a plane perpendicular to principle axis. If the power of the original lens is 4D, then the power of the cut lens will be
Options:
  1. 4D
  2. 2D
  3. 3D
  4. 5D

Answer: Option 2

Explanation:

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10:   Focal length of convex lens of glass (u = 3/2) is 12 cm. If it is immersed in liquid of u = 5/4, then its focal length will be
Options:
  1. 6 cm
  2. 12 cm
  3. 24 cm
  4. 30 cm

Answer: Option 4

Explanation:

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Welcome to fear, said Moist to himself. It's hope, turned inside out. You know it can't go wrong, you're sure it can't go wrong...But it might.
-Terry Pratchett Going Postal