(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

How is a cathode ray beam affected while passing through an electric field?

What are cathode rays? Why are they called ‘cathode rays’? Name a material which exhibits fluorescence when cathode rays fall on it.

How is a zinc sulphide screen affected when a cathode ray beam strikes it?

State any two uses of cathode rays.

Why are materials of low work function preferred as thermionic cathode materials?

In a cathode ray tube state the purpose of covering cathode by thorium and carbon.

In a cathode ray tube state the purpose of the fluorescent screen.

In a cathode ray tube state. How is it possible to increase the rate of emission of electrons.

Name the three main parts of a Cathode Ray Tube.

How is a cathode ray tube used to convert an electrical signal into a visual signal?

Name a common device where a hot cathode ray tube is used.

What do you understand by the term radioactivity?

What are ‘Becquerel rays’?

What is meant by Radioactivity?

Name the Different Radiations Which Are Emitted by the Radioactive Substances.
Are all the radiations mentioned by you, emitted in a single radioactive decay?

Are all the radiations viz. α, β and γ emitted in a single radioactive decay?

A certain nucleus has a mass number 20 and atomic number 9. Find the number of neutrons and protons present in it.

Justify with reason, whether the following nuclear reactions are allowed or not.

\[\ce{^A_Z X -> ^A_{Z + 1}Y + ^0_{-1}β}\] 

Justify with reason, whether the following nuclear reactions are allowed or not.

\[\ce{^A_Z X -> ^A_{Z - 2}X + ^4_{2}He}\] 

An electrons emitter must have how much work function and melting point.