All Free Everyday Science MCQs with Answers

471. Which of the following is commonly called a polyamide ?

• A. Rayon
• B. Nylon
• C. Terylene
• D. Orion

Explanation: Nylon is a polyamide because its polymer chains contain repeating amide groups. Rayon is regenerated cellulose, while Terylene is a polyester.

472. Isotopes of an element have the same number of _______?

• A. Neutrons
• B. Protons
• C. Electrons
• D. Beta rays

Explanation: Isotopes are atoms of the same element, so they have the same number of protons but different numbers of neutrons. Their proton number determines the element’s identity.

473. Cover of the capsule is made of__________?

• A. Paper
• B. Polythene
• C. Eggshell
• D. Gelatin

Explanation: Most traditional hard and soft medicine capsules are made from gelatin, a protein obtained by processing collagen. Gelatin dissolves in the digestive tract, allowing the medicine to be released.

474. Which metal is pure conductor of electricity?

• A. Copper
• B. Gold
• C. Silver
• D. lead

Explanation: Silver has the highest electrical conductivity of all metals at ordinary temperatures, so it conducts current better than copper, gold, or lead. Copper is used more widely because it is much less expensive.

475. A colloidal system in which a liquid is dispersed into a liquid is called_________?

• A. Percipitate
• B. Gel
• C. Emulsion
• D. Sol

Explanation: An emulsion is a colloid in which droplets of one liquid are dispersed through another liquid, as in milk or mayonnaise. A sol contains a solid dispersed in a liquid, while a gel has a liquid held in a solid network.

476. lightest metal is__________?

• A. Lithium
• B. Sodium
• C. Magnesium
• D. Aluminium

Explanation: Lithium is the lightest metal, with the lowest density among metals. Sodium, magnesium, and aluminium are all heavier.

477. Which of the following is used in water purification?

• A. Reverse Osmosis
• B. Osmosis
• C. Cytolysis
• D. Turgor Pressure

Explanation: Reverse osmosis forces water through a semipermeable membrane under pressure, leaving many dissolved salts and contaminants behind. Ordinary osmosis occurs naturally in the opposite direction and is not the usual purification method.

478. ___________ is a strong smelling agent added to LPG cylinders to detect leakage?

• A. Nitrogen Peroxide
• B. Ethyl Mercaptan
• C. Carbon Monoxide
• D. Sulphur Dioxide

Explanation: Ethyl mercaptan has an extremely strong, unpleasant odour, so it is added to otherwise nearly odourless LPG to make leaks noticeable. The gas itself is not given this smell naturally.

479. The heaviest man made element found so for is__________?

• A. Promethium
• B. Ununoctium
• C. Francium
• D. Technetium

Explanation: Ununoctium is the former systematic name for oganesson, element 118, the heaviest element synthesized so far. Its modern official name is oganesson.

480. The heaviest naturally-occurring element is_________?

• A. Radium
• B. Platinum
• C. Uranium
• D. Cadmium

Explanation: Uranium, with atomic number 92, is conventionally regarded in general science as the heaviest naturally occurring element. Heavier elements are generally synthetic, although minute natural traces of some can occur.