General Science — Chemistry — 30Q Speed Round

Question 1

Symbol of Sodium:‌​‍

Accepted Answer

Na — Na (Latin: Natrium).‌​‍

Answer

So

Answer

Sd

Answer

No

Question 2

Noble gases are:‌​‍

Accepted Answer

Inert/unreactive — Noble gases (He, Ne, Ar, Kr, Xe, Rn) are inert — full outer shell.‌​‍

Answer

Very reactive

Answer

Liquid at room temp

Answer

Radioactive

Question 3

The speed of light in vacuum is approximately:‌​‍

Accepted Answer

3 × 10⁸ m/s — The speed of light in vacuum is approximately 3 × 10⁸ metres per second (about 300,000 km/s). ‌​‍Nothing can travel faster than light.

Answer

3 × 10⁶ m/s

Answer

3 × 10¹⁰ m/s

Answer

3 × 10⁴ m/s

Question 4

Aqua regia is a mixture of:‌​‍

Accepted Answer

HCl + HNO₃ — Aqua regia (3:1 HCl:HNO₃) can dissolve gold and platinum — 'Royal Water'.‌​‍

Answer

H₂SO₄ + HCl

Answer

HNO₃ + H₂SO₄

Answer

HCl + CH₃COOH

Question 5

Ohm's Law states that:‌​‍

Accepted Answer

V = IR — Ohm's Law: V = IR (Voltage = Current × Resistance). ‌​‍This is the fundamental law of electricity.

Answer

F = ma

Answer

E = mc²

Answer

P = VI

Question 6

Bleaching powder is:‌​‍

Accepted Answer

Ca(OCl)₂ — Bleaching powder = Calcium Hypochlorite Ca(OCl)₂. ‌​‍Used for water purification and bleaching.

Answer

NaOCl

Answer

NaHCO₃

Answer

CaCO₃

Question 7

The gas produced when acid reacts with metal is:‌​‍

Accepted Answer

Hydrogen — Metal + Acid → Salt + Hydrogen gas. The 'pop' test confirms hydrogen.‌​‍

Answer

Oxygen

Answer

Nitrogen

Answer

Carbon Dioxide

Question 8

Rusting of iron is a process of:‌​‍

Accepted Answer

Oxidation — Rusting is oxidation of iron: Iron + Oxygen + Moisture → Iron Oxide (rust/Fe₂O₃). ‌​‍It requires both oxygen and water.

Answer

Reduction

Answer

Sublimation

Answer

Fermentation

Question 9

The mirror used as a rear-view mirror in vehicles is:‌​‍

Accepted Answer

Convex mirror — Convex mirrors are used as rear-view mirrors because they provide a wider field of view, allowing drivers to see more of the road behind.‌​‍

Answer

Plane mirror

Answer

Concave mirror

Answer

Parabolic mirror

Question 10

Vinegar contains:‌​‍

Accepted Answer

Acetic acid — Vinegar contains acetic acid (CH₃COOH). Lemon = citric acid. Stomach = HCl.‌​‍

Answer

HCl

Answer

Citric acid

Answer

Tartaric acid

Question 11

Liquid non-metal:‌​‍

Accepted Answer

Bromine — Bromine. Only non-metal liquid at room temp.‌​‍

Answer

Mercury

Answer

Iodine

Answer

Phosphorus

Question 12

Graphite and Diamond are allotropes of:‌​‍

Accepted Answer

Carbon — Both are pure carbon in different structures.‌​‍

Answer

Silicon

Answer

Aluminium

Answer

Iron

Question 13

Sound travels fastest in:‌​‍

Accepted Answer

Steel — Sound travels fastest in solids (steel ~5,960 m/s) > liquids (water ~1,480 m/s) > gases (air ~343 m/s). ‌​‍Sound cannot travel through vacuum.

Answer

Vacuum

Answer

Air

Answer

Water

Question 14

Plaster of Paris is:‌​‍

Accepted Answer

CaSO₄·½H₂O — Plaster of Paris = Calcium Sulphate Hemihydrate (CaSO₄·½H₂O). ‌​‍Used in casts and moulds.

Answer

CaCO₃

Answer

Ca(OH)₂

Answer

CaO

Question 15

Rusting of iron is:‌​‍

Accepted Answer

Oxidation — Rusting = oxidation of iron (Fe + O₂ + H₂O → Fe₂O₃).‌​‍

Answer

Reduction

Answer

Sublimation

Answer

Neutralisation

Question 16

The most abundant element in the Earth's crust is:‌​‍

Accepted Answer

Oxygen — Oxygen is the most abundant element in Earth's crust (~46% by weight), followed by Silicon (~28%), Aluminium (~8%), and Iron (~5%).‌​‍

Answer

Silicon

Answer

Iron

Answer

Aluminium

Question 17

Symbol of Gold:‌​‍

Accepted Answer

Au — Au (Latin: Aurum). Ag = Silver.‌​‍

Answer

Go

Answer

Gd

Answer

Ag

Question 18

The hardest natural substance is:‌​‍

Accepted Answer

Diamond — Diamond (a crystalline form of carbon) is the hardest known natural substance, scoring 10 on the Mohs hardness scale.‌​‍

Answer

Gold

Answer

Iron

Answer

Platinum

Question 19

Liquid metal:‌​‍

Accepted Answer

Mercury — Mercury (Hg). Only metal liquid at room temp.‌​‍

Answer

Gold

Answer

Silver

Answer

Tin

Question 20

The most abundant metal in Earth's crust is:‌​‍

Accepted Answer

Aluminium — Aluminium (~8%) is the most abundant metal. ‌​‍Oxygen (~46%) is the most abundant element overall.

Answer

Iron

Answer

Copper

Answer

Gold

Question 21

Most ductile metal:‌​‍

Accepted Answer

Gold — Gold can be drawn into thinnest wire.‌​‍

Answer

Silver

Answer

Copper

Answer

Aluminium

Question 22

The SI unit of force is:‌​‍

Accepted Answer

Newton — Newton (N) is the SI unit of force. ‌​‍Named after Sir Isaac Newton. 1 N = force to accelerate 1 kg by 1 m/s².

Answer

Joule

Answer

Watt

Answer

Pascal

Question 23

Which metal is stored in kerosene?‌​‍

Accepted Answer

Sodium — Sodium is highly reactive with air and water, so it's stored in kerosene to prevent reactions.‌​‍

Answer

Gold

Answer

Iron

Answer

Copper

Question 24

Acid + Base →‌​‍

Accepted Answer

Salt + Water — Neutralisation reaction: Acid + Base → Salt + Water.‌​‍

Answer

Salt + Gas

Answer

Water + Gas

Answer

Metal + Water

Question 25

Dry ice is the solid form of:‌​‍

Accepted Answer

Carbon Dioxide — Dry ice is solid Carbon Dioxide (CO₂). ‌​‍It sublimes directly from solid to gas at -78.5°C, without passing through a liquid phase.

Answer

Oxygen

Answer

Nitrogen

Answer

Water

General Science — Chemistry — 30Q Speed Round