In which of the following device in the expansion of solid is a disadvantages?I. Simple pendulum II. Fire alarms III. Thermostat IV. Bimetallic thermometer

Which of the following instrument is most accurately for comparing electromotive force (e.m.f) of two cells?

Momentum and Kinetic energy are conserved in

Efficiency of a transformer is equal to

The normal temperature of human body is record at what ranges?

The property of a body to remain at rest or to continue to move in a straight line is known as

When a man moves toward a plane mirror at a speed of 6m/s, the distance the man and his image increased at a speed of?

Volatile liquids usually

An alternating current with a frequency of 100HZ has a period of