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

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.

State three common properties of beta rays and cathode rays.

Two radioactive nuclei are represented by _xA^p and _yA^q and when p and q are mass numbers and x, y are the atomic number. How can the products be represented, i .e., what are the new values of p, q. x and y after the emission of an α-particle and a β-particle from A and B respectively.

Which part of the atom undergoes a change in the process of radioactive decay?

From α, β and γ-rays, name the one which travels with the speed of light?

From α, β and γ-rays, name the one which is not affected by electric or magnetic field?

What is the value of the speed of gamma radiations in air or vacuum?

Explain, why radium paint, consisting of zinc sulphide and a trace of radium salt, glows in the dark?

State one use of radio-isotopes. 

It is advised not to touch a radioactive substance by hand. Give reason.

State three ways of obtaining an electron-beam.

Mention four properties of Becquerel rays.

Mention one important function of ear main parts:
State the principle on which the functioning of a nuclear reactor is based.

(a) Which one of the following graphs A or B shows free vibrations in a vacuum and which one shows free vibrations in a medium?

(b) How did you come to this conclusion.