Download App

Atoms and Molecules — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
MCQ
Mass number is denoted by:
  • A
    D
  • B
    S
  • C
    A
  • D
    Z
✓

Answer

  1. A

Explanation:

The mass number (A)  is the number of nucleons, which is the total number of protons and neutrons in the nucleus of an atom.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q-[Che-1M]" from Atoms and Molecules→Atoms and Molecules — all question types→Science STD 9 question papers→CBSE Board STD 9 question papers→CBSE Board question paper generator→

Similar questions

Molecular mass of nitric acid is:
→
Match the Column I (Type of colloid) with Column II (Examples).
Column I
Column II
A.
Gel
I.
Rubber
B.
Foam
II.
Face cream
C.
Emulsion
III.
Coloured gemstone
D.
Solid sol
IV.
Butter
E.
Aerosol
V.
Cloud
→
A homogeneous mixture of two liquids having a small difference (less than 25oC) in boiling points can be separated by using:
→
Which of the following correctly represent the electronic distribution in the Mg atom?
→
An element X' has valency equal to 3. What will be its formula with carbonate ion?
→
Which of the following is/are true as per Thomson's model of atom:
→
Carbon burns in oxygen to form carbon dioxide.The properties of carbon dioxide are:
→
The inter-particle attractive force ______ with increasing distance between particles.
→
A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called:
→
An ionic compound will be formed by the combination of one of the following pairs of elements. This pair of elements is:
  1. Chlorine and calcium.
  2. Calcium and sodium.
  3. Sulphur and carbon.
  4. Chlorine and chlorine.
→