Chose the correct alternative A, B, C or D:

Two point charges (+e) are kept inside a large metallic cube without touching its sides. Electric flux emerging out of the cube is:

• 

• 

• Zero

• 

Chose the correct alternative A, B, C or D

In current electricity. Ohm’s law is obeyed by all:

• solids

• metals

• liquids

• gases

When a charged particle is projected perpendicular to a uniform magnetic field, it describes a circular path in which:

• its speed remains constant 

• its velocity remains constant.

• its velocity remains constant.

• its kinetic energy increases.

 Refractive index of a transparent material is:

• same for all colors 

• maximum for violet colour.

• minimum for violet colour. 

• maximum for red colour.

Which one of the following graphs represents variation of de Broglie wavelength (λ) of particle having linear momentum p: