Turning a nut with a spanner having a short handle is so easy than one with a long handle .

Why a spanner with a long handle is preferred to tighten screws in heavy vehicles ?

Neurons that have a single short process and one axon

Can an object have more than one centre of gravity?

Two distinct lines cannot have more than one point in common.

A tightly-wound, long solenoid has n turns per unit length, a radius r and carries a current i. A particle having charge q and mass m is projected from a point on the axis in a direction perpendicular to the axis. What can be the maximum speed for which the particle does not strike the solenoid?

Name the one planet which have more than 60 Moons.

A square loop of edge a having n turns Is rotated with a uniform angular velocity omega about one of its diagonals which is kept fixed in a horizontal position . A uniform magnetic field B exists in the vertical direction. Find the emf induced in the coil.

A student appears in an objective test which contain 5 multiple choice questions. Each question has 4 choices out of which one correct answer. (i) What is the maximum number of different answers can the students give ? (ii) How will the answer change if each question may have more than one correct answers ?