Class 11 practice
Class 11 gk questions.
GK questions for Class 11, at the level of students aged 15–17, each with its answer and a short explanation. Try each one before opening the answer.
In standard badminton singles play, what is the minimum margin of points a player must lead by to win a game that reaches a 20–20 tie?
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Answer: Two points
Under BWF rules, if the score reaches 20-all, the side that gains a two-point lead first wins the game, up to a maximum cap of 30 points.
In 1930, Mahatma Gandhi launched the Civil Disobedience Movement by marching from Sabarmati Ashram to a coastal village to produce salt. Which village was the destination?
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Answer: Dandi
The historic Salt March covered about 385 kilometres to the coastal village of Dandi in Gujarat, formally initiating the Civil Disobedience Movement.
In the human eye, which transparent structure alters its curvature through the action of ciliary muscles to focus on objects at varying distances?
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Answer: Crystalline lens
The ciliary muscles adjust the curvature and focal length of the flexible crystalline lens, enabling accommodation for viewing objects clearly at different distances.
In the Indian Parliament, a Money Bill can only be introduced in the Lok Sabha. Whose prior recommendation is required before introducing such a bill?
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Answer: President of India
Under Article 117 of the Indian Constitution, a Money Bill can only be introduced in the Lok Sabha with the prior recommendation of the President.
India launched its first dedicated multi-wavelength space observatory in 2015 to study celestial bodies in X-ray, optical, and ultraviolet bands simultaneously. What is the name of this satellite?
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Answer: AstroSat
Launched by ISRO in September 2015, AstroSat is India's dedicated multi-wavelength astronomical observatory operating in orbit.
Originating near Mahabaleshwar in Maharashtra, this major east-flowing peninsular river passes through Karnataka and Andhra Pradesh before draining into the Bay of Bengal. Which river is this?
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Answer: Krishna
The Krishna River originates in the Western Ghats near Mahabaleshwar. It flows approximately 1,400 kilometres across Maharashtra, Karnataka, and Andhra Pradesh into the Bay of Bengal.
In 1837, the script of the ancient Ashokan edicts was deciphered for the first time. Which British antiquarian and philologist achieved this breakthrough?
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Answer: James Prinsep
James Prinsep, an officer of the Calcutta Mint and secretary of the Asiatic Society, deciphered the ancient Brahmi and Kharosthi scripts in 1837.
The historic session of the Indian National Congress where the Purna Swaraj declaration was adopted took place in December 1929. In which city was this session held?
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Answer: Lahore
Presided over by Jawaharlal Nehru, the 1929 Lahore session adopted the resolution for Purna Swaraj (complete independence) on the banks of the Ravi.
Indian Standard Time is calculated based on a specific meridian of longitude that passes through Mirzapur in Uttar Pradesh. What is the longitude of this Standard Meridian?
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Answer: 82.5° E
The Standard Meridian of India is 82.5° E (82°30' E). It was chosen because it lies roughly midway between India's eastern and western limits.
India launched the Aditya-L1 solar observatory to study the Sun continuously without eclipses. At the Sun-Earth Lagrange point L1, which two physical forces precisely balance the orbital motion of the spacecraft?
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Answer: Gravitational pull and centripetal force
At Lagrange points, the combined gravitational pull of the two large bodies equals the centripetal force needed for an object to orbit with them.
Carbon monoxide is dangerous to inhale because it binds strongly to haemoglobin in red blood cells. Which compound is formed by this reaction?
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Answer: Carboxyhaemoglobin
Carbon monoxide binds to haemoglobin with over 200 times the affinity of oxygen, forming carboxyhaemoglobin and starving tissues of necessary oxygen.
Aarav travels between two towns at an average speed of 60 km/h and returns along the same route at 40 km/h. What is his average speed for the entire round trip?
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Answer: 48 km/h
For equal distances, the average speed is the harmonic mean: (2 × 60 × 40) / (60 + 40) = 4800 / 100 = 48 km/h.
- True or false?
Bauxite is the primary ore used commercially for the extraction of aluminium through the Hall-Héroult electrolytic process.
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Answer: True
Bauxite is first purified into alumina via the Bayer process, which is then dissolved in molten cryolite and reduced electrolytically via the Hall-Héroult process to produce aluminium.
- True or false?
A geostationary satellite completes one full orbit around Earth in approximately twenty-four hours while positioned directly over the equator.
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Answer: True
A geostationary satellite orbits at an altitude of approximately 35,786 kilometres above the equator with an orbital period matching Earth's sidereal rotation, appearing stationary from the ground.
- True or false?
Mangrove trees survive in saline coastal waters by filtering salts at their roots or excreting excess salt through specialized leaf glands.
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Answer: True
Mangroves are halophytic plants. They adapt to high salinity through root ultrafiltration, storing salt in shedding leaves, or using excretory leaf glands.
- Fill in the blank.
The optical phenomenon where a beam of light alters its direction when travelling obliquely between media of different densities is termed ___ (refract).
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Answer: refraction
Refraction is the change in the direction and phase velocity of a wave when passing obliquely from one medium into another of differing refractive index.
- Fill in the blank.
Microscopic pores found on plant leaves that regulate the exchange of gases and water vapour during transpiration are known as ___ [Clue: starts with S].
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Answer: stomata
Stomata are specialized microscopic openings primarily located on the epidermis of leaves, flanked by guard cells that regulate gaseous exchange and transpiration.
- Fill in the blank.
Formed by the Brahmaputra River in the state of Assam, ___ is celebrated globally as the world's largest inhabited river island [Clue: starts with M].
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Answer: Majuli
Majuli is a large fluvial island formed by the Brahmaputra river system in Assam, recognized globally as the largest inhabited riverine island on Earth.
Which of the following Southeast Asian nations is the odd one out?
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Answer: Laos
Vietnam, Cambodia, and Thailand possess extensive maritime coastlines. Laos is the only completely landlocked nation in the Southeast Asian region.
Which of the following chemical compounds is the odd one out?
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Answer: Acetic acid
Hydrochloric, nitric, and sulphuric acids are strong inorganic (mineral) acids that dissociate completely in water. Acetic acid is a weak organic acid.
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