Class 9 practice
Class 9 gk questions.
GK questions for Class 9, at the level of students aged 12–14, each with its answer and a short explanation. Try each one before opening the answer.
Which plateau lies between the Aravalli Range and the Vindhya Range in western central India?
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Answer: Malwa Plateau
The Malwa Plateau is bounded by the Aravalli Range to the northwest and the Vindhya Range to the south.
An optical fibre transmits light pulses over long distances with minimal loss of signal. Which optical phenomenon makes this possible?
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Answer: Total internal reflection
Light inside an optical fibre strikes the boundary between the core and cladding at an angle greater than the critical angle, reflecting completely inside.
The Keoladeo National Park in Bharatpur, Rajasthan, is an internationally famous wetland sanctuary known mainly for which group of animals?
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Answer: Migratory birds
Keoladeo National Park is a renowned UNESCO World Heritage site that provides wintering grounds for thousands of aquatic migratory birds.
Which narrow natural strait connects the Mediterranean Sea to the Atlantic Ocean and separates Europe from Africa?
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Answer: Strait of Gibraltar
The Strait of Gibraltar connects the Atlantic Ocean to the Mediterranean Sea and separates Spain in Europe from Morocco in Africa.
A regular polygon has interior angles that each measure 140 degrees. How many sides does this polygon have?
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Answer: 9
Each exterior angle measures 180° - 140° = 40°. Dividing the total exterior angle sum of 360° by 40° gives 9 sides.
Which word describes a material that allows light to pass through, but scatters it so objects on the other side cannot be seen clearly?
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Answer: Translucent
Translucent substances transmit some light while scattering it, unlike transparent objects which transmit light clearly or opaque objects which block it completely.
Which term describes a substance that absorbs moisture from the atmosphere without absorbing enough to form a liquid solution?
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Answer: Hygroscopic
Hygroscopic substances absorb atmospheric moisture without dissolving into it. Deliquescent substances absorb so much water that they dissolve completely.
An express train travelling at 72 km/h crosses a 200-metre-long station platform in 25 seconds. What is the train's length?
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Answer: 300 metres
Speed is 72 × (5/18) = 20 m/s. In 25 seconds, total distance covered is 500 m. Train length = 500 m - 200 m = 300 m.
- True or false?
In every convex polygon, the sum of all interior angles equals the product of its number of sides and 180 degrees.
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Answer: False
For any convex polygon with n sides, the sum of the interior angles is given by the formula (n minus 2) multiplied by 180 degrees.
- True or false?
A convex mirror always forms an upright and diminished virtual image of an object placed in front of it.
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Answer: True
Convex mirrors diverge light rays reflecting off their curved surface. As a result, the image formed is always virtual, erect, and smaller than the actual object.
- True or false?
A solar eclipse can occur only during the new moon phase when the Moon passes between Earth and the Sun.
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Answer: True
A solar eclipse requires the Moon to block the Sun's light from reaching Earth. This alignment occurs exclusively during the new moon phase.
- Fill in the blank.
The SI unit of pressure is named after the French scientist Blaise ___. (starts with P)
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Answer: Pascal
Pressure is defined as force per unit area. In the International System of Units, pressure is measured in pascals, named after Blaise Pascal.
- Fill in the blank.
Dominated by the Sundari tree, the largest contiguous mangrove forest on Earth is the ___. (Starts with S)
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Answer: Sundarbans
The Sundarbans delta, shared between India and Bangladesh, forms the world's largest contiguous tidal halophytic mangrove ecosystem.
Which plant is the odd one out based on how it obtains nutrients?
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Answer: Cuscuta
Cuscuta is a parasitic plant that absorbs nutrients from a host plant. Pitcher plants, Venus flytraps, and sundews are insectivorous plants.
Which of the following geometric figures is the odd one out?
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Answer: Trapezium
A trapezium has only one pair of parallel sides, whereas rectangles, rhombuses, and squares are parallelograms with two pairs.
In plant leaves, tiny pores regulate gas exchange and transpiration. Which specialized cells flank these pores and control their opening and closing?
Level 5 of 5Show the answer
Answer: Guard cells
Guard cells swell with water to open stomatal pores and shrink when water is scarce to close them, regulating water loss and gas exchange.
Light travels from a denser medium to a rarer medium. What name is given to the minimum angle of incidence that causes total internal reflection?
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Answer: Critical angle
The critical angle is the angle of incidence beyond which light passing from an optically denser to rarer medium undergoes total internal reflection instead of refraction.
During the reign of which Gupta emperor did the Chinese traveller Faxian (Fa-Hien) visit India?
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Answer: Chandragupta II
Faxian visited India during the reign of Chandragupta II (also known as Vikramaditya) to collect Buddhist religious manuscripts.
In standard badminton singles or doubles, a player usually needs 21 points to win a game. What is the maximum winning score allowed during an extended tie?
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Answer: 30
Under Badminton World Federation rules, if the score reaches 29-all, the side scoring the 30th point wins the game immediately.
- Fill in the blank.
Discovered in Gujarat, the ancient Harappan port city famous for possessing a massive brick dockyard is ___ (first letter: L).
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Answer: Lothal
Excavated near the Gulf of Khambhat, Lothal was an important Indus Valley hub featuring a large tidal basin used for shipping.
These questions come from Ado’s question bank and are written with AI help. They are never used in ranked play, so practising them here can’t change anyone’s rank.
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