Q1. Which natural substance prevents blood from clotting inside blood vessels?
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Answer: A. Heparin
Heparin is an anticoagulant that prevents clotting inside blood vessels; the others help clotting.
Biology - Circulatory System · hard
Q2. Which valve lies between the left atrium and the left ventricle?
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Answer: A. Bicuspid (mitral) valve
The bicuspid or mitral valve, with two cusps, guards the opening between the left atrium and left ventricle.
Biology - Circulatory System · hard
Q3. Who was the first woman Chief Minister of an Indian state?
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Answer: C. Sucheta Kripalani
Sucheta Kripalani became Chief Minister of Uttar Pradesh in 1963, the first woman CM in India.
Firsts in India · hard
Q4. Which part of the heart acts as its natural pacemaker?
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Answer: B. Sino-atrial (SA) node
The SA node in the right atrium generates the impulses that start each heartbeat.
Biology - Circulatory System · hard
Q5. Lake Baikal, the world's deepest lake, is in which country?
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Answer: A. Russia
Lake Baikal in Siberia, Russia, is the deepest lake in the world.
World Geography · hard
Q6. The International Olympic Committee (IOC) has its headquarters in:
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Answer: A. Lausanne
The IOC is headquartered in Lausanne, Switzerland.
International Organisations · hard
Q7. The Food and Agriculture Organization (FAO) has its headquarters in:
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Answer: D. Rome
The FAO is headquartered in Rome, Italy.
International Organisations · hard
Q8. Which plant hormone inhibits growth and causes closing of stomata during water stress?
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Answer: D. Abscisic acid
Abscisic acid inhibits growth and triggers stomatal closure under stress, e.g., wilting.
Biology - Plant Physiology · hard
Q9. Under which Article can the President establish an Inter-State Council?
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Answer: C. Article 263
Article 263 allows the President to set up an Inter-State Council to coordinate between states and the Centre. One was set up in 1990 on the Sarkaria Commission's recommendation.
Indian Polity · hard
Q10. A body falls freely from a height of 20 m. Taking g = 10 m/s², the time taken to reach the ground is:
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Answer: B. 2 s
20 = ½ × 10 × t², so t² = 4 and t = 2 s.
Physics - Motion · hard
Q11. Which channel separates the Andaman Islands from the Nicobar Islands?
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Answer: A. Ten Degree Channel
The Ten Degree Channel separates the Andaman group from the Nicobar group.
Indian Geography · hard
Q12. The rule used to find the direction of force on a current-carrying conductor in a magnetic field is:
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Answer: B. Fleming's left-hand rule
Fleming's left-hand rule gives the direction of force on a conductor (motor rule).
Physics - Magnetism · hard
Q13. A ship sends an ultrasonic signal and receives its echo from the seabed after 2 s. If sound travels at 1500 m/s in sea water, the depth of the sea is:
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Answer: C. 1500 m
Depth = (1500 × 2)/2 = 1500 m.
Physics - Sound · hard
Q14. Doddabetta, the highest peak of the Nilgiri hills, is in which state?
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Answer: B. Tamil Nadu
Doddabetta is near Ooty in Tamil Nadu.
Indian Geography · hard
Q15. Which compound is added to LPG so that a leak can be detected by its smell?
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Answer: B. Ethyl mercaptan
LPG itself is odourless; ethyl mercaptan is added to give it a strong smell.
Chemistry - Everyday Chemistry · hard
Q16. Which is the hardest substance in the human body?
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Answer: B. Tooth enamel
Enamel, covering the crown of teeth, is the hardest substance in the human body.
Biology - Digestive System · hard
Q17. Excessive growth of algae in water bodies due to run-off of fertilisers is called:
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Answer: D. Eutrophication
Excess nitrates and phosphates cause algal blooms - eutrophication.
Chemistry - Environmental Chemistry · hard
Q18. Standard atmospheric pressure at sea level is about:
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Answer: C. 1.01 × 10^5 Pa
1 atm ≈ 1.013 × 10^5 Pa, about 76 cm of mercury.
Physics - Pressure · hard
Q19. Which part of a neuron carries the impulse away from the cell body?
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Answer: A. Axon
The axon conducts nerve impulses away from the cell body towards the next neuron or effector.
Biology - Nervous System · hard
Q20. The East India Company got the Diwani (revenue rights) of Bengal, Bihar and Orissa through which treaty of 1765?
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Answer: A. Treaty of Allahabad
The Treaty of Allahabad (1765), signed with Mughal emperor Shah Alam II after Buxar, gave the Company the Diwani of Bengal, Bihar and Orissa.
Modern History · hard
Q21. Where is the headquarters of the International Olympic Committee (IOC)?
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Answer: C. Lausanne
The IOC headquarters is at Lausanne, Switzerland. The IOC was founded in 1894.
Sports · hard
Q22. The traditional 'Bagh print' block printing of MP gets its name from a village in which district?
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Answer: D. Dhar
Bagh print is named after Bagh village in Dhar district, which is also known for the Bagh caves.
Art & Culture · hard
Q23. At what temperature do the Celsius and Fahrenheit scales show the same reading?
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Answer: B. −40°
C = 9C/5 + 32 gives C = −40, so −40 °C = −40 °F.
Physics - Heat · hard
Q24. Who discovered the nucleus of the cell in 1831?
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Answer: B. Robert Brown
Robert Brown discovered the nucleus in 1831 while studying orchid cells.
Biology - Cell & Tissues · hard
Q25. Which of the following vitamins is water-soluble?
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Answer: D. Vitamin C
Vitamin C (and B-complex) is water-soluble, whereas A, D, E and K are fat-soluble.