Force, Work, Energy and Power — Physics STD 10 — Question

A lens forms an erect, magnified and virtual image of an object. name the type of lens.

Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
A compressed spring

A mixture of radioactive substances gives off three types of radiation name the radiation which has the highest ionizing power.

How will the direction of force be changed, if the current is reversed in the conductor placed in a magnetic field?

With reference to magnitude of force and its direction, how does centripetal force differ from centrifugal force?

A type of single pulley is very often used as a machine even though it does not give any gain in mechanical advantage. For what purpose is such a pulley used?

Name a machine which can be used to multiply force and change the direction of force applied.

What type of lenses are used in spectacles worn by an old lady for knitting?

Why do echoes produced in an empty auditorium usually decrease when it is full of audience?

Define the term dispersion of light.