All Free Everyday Science MCQs with Answers

581. Wood is the main raw material for the manufacture of ____________?

• A. Paint
• B. Gun powder
• C. Paper
• D. Ink

Explanation: Wood contains cellulose fibres, which are processed into pulp and then made into paper. The other materials listed are manufactured from different chemical or mineral raw materials.

582. The chemical name of Laughing gas is___________?

• A. Nitric oxide
• B. Nitrogen dioxide
• C. Nitrogen pentoxide
• D. Nitrous oxide Physics

Explanation: Laughing gas is nitrous oxide, with the formula N₂O. Nitrogen dioxide is a toxic brown gas, so it is not the gas used as an anaesthetic or propellant.

583. In the manufacture of banaspati ghee the gas used is __________?

• A. Helium
• B. Hydrogen
• C. Oxygen
• D. Nitrogen

Explanation: Hydrogen is used to add hydrogen atoms to unsaturated vegetable oils, converting them into the more solid fat used in banaspati ghee. This industrial process is called hydrogenation.

584. Which Gas is used in the preparation of Soft drinks?

• A. Oxygen
• B. Carbon dioxide
• C. Nitrogen
• D. Halogen

Explanation: Carbon dioxide dissolves in soft drinks under pressure and forms weak carbonic acid, producing their characteristic fizz and slight tang. Oxygen and nitrogen do not provide this carbonation.

585. Sodium carbonate is produced by____________?

• A. haber process
• B. Amonia solvay process
• C. decons process
• D. lead chamber process

Explanation: Sodium carbonate is manufactured industrially by the Solvay process, which uses ammonia, brine, limestone and carbon dioxide. The Haber process produces ammonia, not sodium carbonate.

586. The repetition of property after a certain interval called ___________?

• A. Electron efinity
• B. Atomic radius
• C. periodicity of property
• D. none of these

Explanation: Periodicity is the regular repetition of similar properties at definite intervals when elements are arranged by atomic number. Atomic radius and electron affinity are individual properties, not the repetition itself.

587. The soul of chemistry is dealing with___________?

• A. Internal structural changes in matter
• B. Composition of matter
• C. Properties of matter
• D. Composition and properties of matter

Explanation: Chemistry studies what matter is made of and how its composition determines its properties. Structural and chemical changes are also central, making “composition and properties” the best available option.

588. Elements are made of _________?

• A. Atoms
• B. Molecules
• C. H2O
• D. Compounds

Explanation: An element consists of atoms that all have the same number of protons. Molecules and compounds may contain atoms of two or more different elements, so they are not the basic definition of an element.

589. ____________ have no charge?

• A. Neutrons
• B. Protons
• C. Electrons
• D. None of These

Explanation: Neutrons have no electric charge, whereas protons are positive and electrons are negative. Neutrons and protons are located in the atomic nucleus.

590. ___________are negatively (-) charged particles of an atom?

• A. Protons
• B. Neutrons
• C. Electrons
• D. None of These

Explanation: Electrons carry a negative electric charge and occupy regions around the nucleus called electron shells or orbitals. Protons are positive and neutrons are electrically neutral.