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:

- will be zero
- increases
- decreases
- remain same

Answer: Option 3

Explanation:

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2:
The unit of permittivity of free space is

Options:

- Coulomb / Newton meter
- Newton meter ^2 / Coulomb ^2
- Coulomb ^2 / Newton meter ^2
- 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:

- 2qE and minimum
- qE and pE
- zero and minimum
- 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:

- decreased K times
- increased K times
- remains unchanged
- 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:

- zero
- 5 u cm^-2
- 20 u cm^-2
- 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:

- qEy^2
- qE^2y
- qEy
- 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:

- p^-1 and r^-2
- p and r^-2
- p^2 and r^-3
- 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
- 2:1
- 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:

- 4D
- 2D
- 3D
- 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:

- 6 cm
- 12 cm
- 24 cm
- 30 cm

Answer: Option 4

Explanation:

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