Class 10 practice
Class 10 gk questions.
GK questions for Class 10, at the level of students aged 15–17, each with its answer and a short explanation. Try each one before opening the answer.
In the human circulatory system, most veins carry deoxygenated blood toward the heart. Which specific blood vessels carry freshly oxygenated blood from the lungs into the left atrium of the heart?
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Answer: Pulmonary veins
Pulmonary veins are unique because they carry oxygenated blood from the lungs directly into the left atrium of the heart, unlike systemic veins which carry deoxygenated blood.
Which primary blood vessel carries oxygen-rich blood directly out of the left ventricle to distribute it throughout the human body?
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Answer: Aorta
The aorta is the largest artery in the human body. It receives oxygenated blood from the left ventricle and directs it into systemic circulation.
One planet in the Solar System has an extreme axial tilt of approximately 98 degrees. Because of this unusual orientation, it appears to roll along its orbital path around the Sun. Which planet is this?
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Answer: Uranus
Uranus rotates almost on its side with an axial tilt of nearly 98 degrees, likely caused by a massive collision with a protoplanet early in its history.
Which word describes a word or phrase that reads the same backward as forward, such as 'racecar' or 'madam'?
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Answer: Palindrome
A palindrome is a sequence of characters that reads the same forwards and backwards, ignoring punctuation and spaces.
- True or false?
In the International System of Units, the ampere is designated as the base unit for measuring electric potential difference.
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Answer: False
The ampere measures electric current. The volt is the SI unit used to quantify electric potential difference.
- Fill in the blank.
The green pigment responsible for absorbing light energy during photosynthesis in plant leaves is called ___ (starts with C).
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Answer: chlorophyll
Chlorophyll absorbs red and blue wavelengths from sunlight within chloroplasts, giving leaves their characteristic green colour.
Ananya buys a scientific calculator for ₹720 after receiving a discount of 20 percent on its marked price. What was the original marked price of the calculator?
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Answer: ₹900
If 80 percent of the marked price equals ₹720, dividing ₹720 by 0.80 gives the original marked price as ₹900.
An express train measuring 240 metres in length travels at a constant speed of 72 km/h. How many seconds will it take to completely cross a stationary platform of length 360 metres?
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Answer: 30 seconds
Speed is 72 km/h, which equals 20 m/s. The total distance required to clear the platform is 240 m + 360 m = 600 m. Time taken is 600 / 20 = 30 seconds.
Optical fibres transmit data pulses across long distances with exceptionally low signal attenuation. Which optical principle enables light to travel through the glass core without escaping?
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Answer: Total internal reflection
When light enters the core at an angle greater than the critical angle, it reflects completely off the cladding boundary, travelling forward without escaping.
Under the Constitution of India, which official serves as the ex-officio Chairman of the Rajya Sabha?
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Answer: Vice-President of India
Article 64 of the Indian Constitution stipulates that the Vice-President of India is the ex-officio Chairman of the Council of States (Rajya Sabha).
The Rajya Sabha serves as the Council of States in the Indian Parliament. What is the standard term of office for an individual elected member of this House?
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Answer: 6 years
The Rajya Sabha is a permanent body and cannot be dissolved. Members are elected for a six-year term, with one-third retiring every two years.
What property allows carbon to form an exceptionally large variety of stable, long-chain compounds with itself and other elements?
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Answer: Catenation
Catenation is the self-linking ability of carbon atoms via covalent bonds, enabling the formation of diverse, long-chain and cyclic structures in organic chemistry.
Baking soda is widely used in domestic cooking and baking to help batter rise. What is the chemical name of baking soda?
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Answer: Sodium hydrogen carbonate
Baking soda is sodium hydrogen carbonate (NaHCO3). When heated or mixed with an acid, it releases carbon dioxide gas, causing dough to expand.
Acid rain can corrode historic monuments made of limestone or marble. Which acid, formed from atmospheric emissions of sulfur dioxide reacting with water and oxygen, is predominantly responsible?
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Answer: Sulfuric acid
Sulfur dioxide oxidises in the atmosphere to form sulfur trioxide, which dissolves in cloud water to produce sulfuric acid.
- True or false?
The Tropic of Cancer passes through eight Indian states, dividing the country into roughly equal northern and southern regions.
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Answer: True
The Tropic of Cancer crosses Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura, and Mizoram.
- True or false?
Chlorophyll pigments in green plants primarily absorb green light while reflecting red and blue wavelengths.
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Answer: False
Chlorophyll pigments absorb blue and red light efficiently. They reflect green light back, which gives foliage its distinct green colour.
- Fill in the blank.
A representative elected to the Rajya Sabha, the upper house of the Parliament of India, serves a regular term of ___ years.
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Answer: 6
The Rajya Sabha is a permanent body and not subject to dissolution. However, each member serves a six-year term, with one-third retiring every two years.
- Fill in the blank.
In the human circulatory system, erythrocytes rely on an iron-rich protein called ___ to transport oxygen from the lungs throughout the body (starts with H).
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Answer: haemoglobin
Haemoglobin is the iron-containing metalloprotein in red blood cells that reversibly binds oxygen molecules to deliver them across body tissues.
Which of the following international sports tournaments is the odd one out?
Level 2 of 5Show the answer
Answer: Thomas Cup
The Thomas Cup is a premier international team competition in badminton. Wimbledon, Roland Garros, and the US Open are Grand Slam tennis tournaments.
Which of the following Earth layers is the odd one out?
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Answer: Lithosphere
The troposphere, stratosphere, and mesosphere are concentric thermal layers of Earth's atmosphere, while the lithosphere is the solid outermost rock layer.
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