10th Samacheer Quiz

Q1. Atoms of the same element with different mass numbers are called:

Isotopes Isobars Ions Molecules

Q2. In a compound such as NaCl, atoms of the elements are present in:

Random ratio Fixed ratio Never 1:1 Separately without change

Q3. The smallest unit of an element that retains its chemical identity is an atom.

Atom Cell Tissue Organ

Q4. What does the atomic number of an element represent?

Number of neutrons Number of protons Total mass Mass number only

Q5. A molecule is made of two or more atoms chemically bonded together.

Molecule Cell Tissue Organ

Q6. An atom has 11 protons and 12 neutrons. What is its mass number?

11 12 23 1

Q7. Which statement is most directly related to Unit 7: Atoms and Molecules?

Atom Cell wall Gravity Photosynthesis