Hard GK Questions (Hard General Knowledge)
Hard GK questions with answers: 15 general knowledge questions for players who find the usual quiz too easy, each with a short explanation. Play free, no sign-up.
15 questionsMedium–Hard~3 minNo timer
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About this Hard General Knowledge quiz
These hard GK questions are for players who breeze through the usual quizzes and want something that pushes back. The 15 questions jump across science, world geography, history, Indian heritage and law, with a couple of easier warm-ups and plenty of real stumpers, including one for anyone hunting a hard flag quiz question.
This hard GK quiz suits quiz club members, college students, competitive-exam aspirants and trivia regulars who want to find the edges of what they know. The wrong options are chosen to be tempting, so read every one carefully: many of these questions are set to trip you up on a near miss, like Eswatini versus Lesotho or Canberra versus Wellington.
Every answer has a short explanation, which turns these hard general knowledge questions and answers into a quick revision sheet. Play once without help, note your score, then open the answer key below and read the reasoning before trying again. Fun fact to leave with: Lake Baikal in Siberia is so deep that it holds roughly a fifth of all the unfrozen fresh surface water on Earth. Scoring 10 or more here is genuinely impressive.
Hard General Knowledge questions with answers
Show answers
Which is the only country whose national flag is neither a rectangle nor a square?
- Bhutan
- Nepal
- Switzerland
- Vatican City
Answer: Nepal. Nepal's flag is two stacked triangles (pennants). Switzerland and Vatican City have square flags, and Bhutan's is a rectangle with a dragon.
Which metal has the highest melting point?
Photo: Mister rf, CC BY-SA 4.0, via Wikimedia Commons - Titanium
- Osmium
- Platinum
- Tungsten
Answer: Tungsten. Tungsten melts at about 3,422 degrees Celsius, the highest of any metal, which is why it was used for light-bulb filaments.
The Peace of Westphalia in 1648 ended which European war?
Photo: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons - Thirty Years' War
- Hundred Years' War
- Seven Years' War
- Wars of the Roses
Answer: Thirty Years' War. The Peace of Westphalia ended the Thirty Years' War (1618-1648). It is often seen as the start of the modern idea of sovereign states.
Which is the deepest lake in the world?
- Lake Tanganyika
- Lake Superior
- Lake Baikal
- Caspian Sea
Answer: Lake Baikal. Lake Baikal in Siberia is about 1,640 m deep and holds roughly a fifth of the world's unfrozen surface fresh water. Lake Tanganyika is second deepest.
Who was the first Indian to win a Nobel Prize in a science subject?
- Har Gobind Khorana
- Subrahmanyan Chandrasekhar
- Venkatraman Ramakrishnan
- C. V. Raman
Answer: C. V. Raman. C. V. Raman won the 1930 Nobel Prize in Physics for the Raman effect, the scattering of light. India marks his discovery each year on National Science Day, 28 February.
Which is the smallest bone in the human body?
- Stapes
- Incus
- Malleus
- Hyoid
Answer: Stapes. The stapes (stirrup) in the middle ear is about 3 mm long. With the incus and malleus it passes sound vibrations to the inner ear.
Which country is completely surrounded by South Africa?
- Eswatini
- Lesotho
- Botswana
- Namibia
Answer: Lesotho. Lesotho is an enclave inside South Africa. Eswatini is almost surrounded too, but it also shares a border with Mozambique.
Which Mughal emperor wrote his own memoirs, the Tuzuk-i-Jahangiri?
- Akbar
- Humayun
- Jahangir
- Aurangzeb
Answer: Jahangir. Jahangir wrote his memoirs in Persian, recording court life, nature and his love of painting. Babur's memoir, the Baburnama, was in Chagatai Turkic.
Which of these national capitals lies furthest south?
- Canberra
- Buenos Aires
- Santiago
- Wellington
Answer: Wellington. Wellington, at about 41 degrees south, is the southernmost capital of any sovereign country. Canberra is near 35 degrees south.
Particles called 'bosons' are named after which Indian physicist?
- Jagadish Chandra Bose
- Satyendra Nath Bose
- Meghnad Saha
- Homi J. Bhabha
Answer: Satyendra Nath Bose. Satyendra Nath Bose's 1924 paper, extended by Einstein, gave us Bose-Einstein statistics. The Higgs boson is one famous member of this particle family.
After nitrogen and oxygen, which gas is the third most abundant in Earth's dry air?
- Argon
- Carbon dioxide
- Neon
- Helium
Answer: Argon. Argon makes up about 0.93% of dry air. Carbon dioxide, despite its big climate impact, is only about 0.04%.
The Strait of Malacca separates the Malay Peninsula from which island?
Photo: ZoschH, CC BY-SA 4.0, via Wikimedia Commons - Java
- Borneo
- Sumatra
- Sulawesi
Answer: Sumatra. The Strait of Malacca runs between Malaysia and Indonesia's Sumatra. It is one of the busiest shipping lanes in the world.
What does 'Mohenjo-daro', the name of the Harappan city, mean in Sindhi?
- City of Rivers
- Mound of the Dead
- House of the Great Bath
- Hill of Kings
Answer: Mound of the Dead. Mohenjo-daro means 'Mound of the Dead (Men)'. The city's real ancient name is unknown because the Harappan script is still undeciphered.
Which Indian state has had a common civil law for all communities since Portuguese rule?
Photo: Slyronit, CC BY-SA 4.0, via Wikimedia Commons - Kerala
- Sikkim
- Goa
- Mizoram
Answer: Goa. Goa kept the Portuguese-era civil code after joining India in 1961. Uttarakhand became the first state to bring in its own Uniform Civil Code, in 2025.
Which is the SI base unit of luminous intensity?
- Lumen
- Lux
- Watt
- Candela
Answer: Candela. The candela is one of the seven SI base units. The lumen measures total light output and the lux measures light falling on a surface.
Frequently asked questions
Where can I find Hard General Knowledge questions with answers?
On this page. Play the 15-question quiz, then open the answer key to see every hard GK question with its correct answer and a short explanation.
What are some hard general knowledge questions?
Good hard questions test details people half-know: which metal has the highest melting point (tungsten), which country sits entirely inside South Africa (Lesotho), or which capital lies furthest south (Wellington). This quiz has 15 of them across science, geography and history.
How many questions are in this Hard General Knowledge quiz?
There are 15 multiple-choice questions with four options each. Expect to spend about five minutes, since many need a second look.
Can I play the Hard General Knowledge quiz online for free without signing up?
Yes. It is free, with no login or sign-up, and your score appears instantly. You can share it and challenge friends to beat you.