English Medium Class 9 - CBSE Question Bank Solutions for Science

Does the solubility of a substance change with temperature? Explain with the help of an example.

You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?

A sample of vitamic C is known to contain 2.58 ×10²⁴ oxygen atoms. How many moles of oxygen atoms are present in the sample?

On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole.

Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in to discovery of

The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?

Dalton’s atomic theory successfully explained

(i) Law of conservation of mass

(ii) Law of constant composition

(iii) Law of radioactivity

(iv) Law of multiple proportions

Which of the following statement is always correct?

Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order

1. Rutherford’s atomic model
2. Thomson’s atomic model
3. Bohr’s atomic model

Write any two observations which support the fact that atoms are divisible.

The book Systema Naturae was written by

Write true (T) or false (F)

Monera is divided into Archaebacteria and Eubacteria.

Write true (T) or false (F)

Blue green algae belongs to the kingdom Protista.

Write true (T) or false (F)

All prokaryotes are classified under Monera.

Prokaryotes are grouped in Kingdom ______.

Give examples for the following

Bilateral, dorsiventral symmetry is found in ______.

A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is,

Area under a v – t graph represents a physical quantity which has the unit

Name the process associated with the following

A drop of ink placed on the surface of water contained in a glass spreads throughout the water.

What are the favourable qualities given to gold when it is alloyed with copper or silver for the purpose of making ornaments?