Thermionic Emission and Radioactivity — Physics STD 10 — Question

A radioactive source emits three types of radiations

Name the radiation consisting of the same kind of particles as the cathode rays.

Write an expression for calculating electrical power in terms of current and resistance.

Is power a scalar or a vector quantity?

Is kinetic energy a scalar or a vector physical quantity?

Name the physical quantity which has its unit as j/(kg)/(K).

Which class of lever found in the human body is being used by a boy when he raises the weight of his body on his toes?

Name the scientist who discovered Ultraviolet rays

By reducing the amplitude of a sound wave, its:

• Pitch increases

• Loudness decreases

• Loudness increases

• Pitch decreases

State whether heat energy is absorbed or released during melting of ice.

What is meant by the statement, ‘the critical angle for diamond is 24°’?