Free Critical Thinking MCQs with Answers

• A. Mercury
• B. Venus
• C. Earth
• D. Moon

Explanation: Mercury, Venus and Earth are planets orbiting the Sun. The Moon is Earth's natural satellite.

• A. January
• B. March
• C. May
• D. June

Explanation: January, March and May each have 31 days. June has 30 days, so it is the different month.

• A. Mercury
• B. Venus
• C. Mars
• D. Jupiter

Explanation: Mercury, Venus and Mars are terrestrial, rocky planets. Jupiter is a gas giant and belongs to a different planetary group.

• A. Listen
• B. Silent
• C. Enlist
• D. Stone

Explanation: Listen, silent and enlist contain exactly the same six letters in different orders. Stone has different letters and cannot join that group.

• A. Salmon
• B. Tuna
• C. Trout
• D. Shark

Explanation: Salmon, tuna and trout are bony fish with skeletons made mainly of bone. A shark has a skeleton made mainly of cartilage.

• A. Organ
• B. Piano
• C. Harmonium
• D. Guitar

Explanation: An organ, piano and harmonium are keyboard instruments. A guitar is played with strings and has no keyboard.

• A. Apple
• B. Mango
• C. Orange
• D. Spinach

Explanation: Apple, mango and orange are fruits commonly eaten as such. Spinach is a leafy vegetable, so it is the odd item.

• A. Hammer
• B. Screwdriver
• C. Pliers
• D. Flute

Explanation: A hammer, screwdriver and pliers are hand tools used for practical work. A flute is a musical instrument, not a tool.

• A. Sparrow
• B. Eagle
• C. Pigeon
• D. Dolphin

Explanation: Sparrows, eagles and pigeons are birds. A dolphin is a mammal that lives in water.

• A. Doctor
• B. Teacher
• C. Engineer
• D. Hospital

Explanation: Doctor, teacher and engineer are names of professions. A hospital is a place where some professionals work.

• A. Kilogram
• B. Metre
• C. Second
• D. Litre

Explanation: Kilogram, metre and second are SI base units. Litre is a unit of volume, but it is not an SI base unit.

• A. Violin
• B. Cello
• C. Guitar
• D. Trumpet

Explanation: The violin, cello and guitar produce sound from vibrating strings. A trumpet produces sound through a vibrating player’s lips and air in…

• A. Lion
• B. Tiger
• C. Leopard
• D. Cheetah

Explanation: Lion, tiger and leopard belong to the genus Panthera. The cheetah is a different genus, Acinonyx, although all four are big cats.

• A. Chimpanzee
• B. Gorilla
• C. Orangutan
• D. Baboon

Explanation: Chimpanzees, gorillas and orangutans are great apes. A baboon is a monkey, so it belongs to a different primate group.

• A. Newton
• B. Joule
• C. Watt
• D. Kilogram

Explanation: The newton, joule and watt are derived SI units named after scientists. The kilogram is an SI base unit and is not named after a person.

• A. Java
• B. Sumatra
• C. Bali
• D. Sri Lanka

Explanation: Java, Sumatra and Bali are islands belonging to Indonesia. Sri Lanka is also an island, but it is a separate country in South Asia.

• A. Plate
• B. Spoon
• C. Fork
• D. Knife

Explanation: Spoons, forks and knives are types of cutlery. A plate is tableware but is not cutlery.

• A. Nepal
• B. Bhutan
• C. Sri Lanka
• D. Afghanistan

Explanation: Nepal, Bhutan and Afghanistan are landlocked countries. Sri Lanka is an island country with no land border.

• A. Camel
• B. Lizard
• C. Horse
• D. Goat

Explanation: Camel, horse and goat are hoofed mammals. A lizard is a reptile, so it belongs to a different group.

• A. Oak
• B. Pine
• C. Maple
• D. Bamboo

Explanation: Oak, pine and maple are commonly classified as trees. Bamboo is a tall grass, despite its tree-like appearance.