This set of Dairy Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Basic Chemical Concepts – 1”.
1. _____ is the smallest building block of all matter in nature and cannot be divided chemically.
a) Element
b) Molecule
c) Cube
d) Atom
View Answer
Explanation: Atom is the smallest particle of a chemical element that can exist. They cannot be divided chemically.
2. A Substance in which all the atoms are of the same kind is called ______
a) Blocks
b) Pyramid
c) Element
d) Atom
View Answer
Explanation: Chemical substance interconvert able or broken down into simpler substances and are primary constituents of matter is called element. They have atoms of the same kind.
3. Approximately how many elements are known to us?
a) 20
b) 30
c) More than 100
d) 50
View Answer
Explanation: We know the existence of more than 100 elements. 115 elements have been discovered so far.
4. What constitutes the nucleus of the atom?
a) Electron
b) Proton
c) Neutron
d) Proton and neutron
View Answer
Explanation: Proton and Neutron are present in the nucleus of the atom. They are together known as nucleons.
5. The charge on a proton is _____
a) Positive
b) Negative
c) Neutral
d) Both positive and Negative
View Answer
Explanation: Proton is a positively charged ion. They have a mass of 1 atomic unit. They are present in the nucleus of the atom.
6. The charge on Electron is _______
a) Positive
b) Negative
c) Neutral
d) Both positive and Negative
View Answer
Explanation: Electron is negatively charged. An electron is a subatomic particle with a charge of negative electricity. It is found in all atoms and acting as the primary carrier of electricity in solids.
7. The charge on neutron is ______
a) Positive
b) Negative
c) Neutral
d) Both positive and Negative
View Answer
Explanation: Neutron is neutral, having no charge on itself.
8. The smallest part of an element that cannot exist as a free state is __________
a) Ion
b) Charge
c) Atom
d) Molecule
View Answer
Explanation: Ion is the smallest part of an element. It cannot exist as a free state. Ion can be an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
9. What are positively charged Ions in a solution called?
a) Cation
b) Anion
c) Atom
d) Element
View Answer
Explanation: Cation is a positively charged ion. It will be attracted to a cathode in electrolysis.
Sanfoundry Global Education & Learning Series – Dairy Engineering.
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