Q1. The unit of electric current is:

• A) Volt
• B) Watt
• C) Ampere
• D) Ohm

Answer: C — The SI unit of electric current is Ampere (A).

Q2. DNA stands for:

• A) Deoxyribonucleic Acid
• B) Dinitric Acid
• C) Dynamic Neural Array
• D) Dual Nucleic Acid

Answer: A — DNA = Deoxyribonucleic Acid — the molecule that carries genetic information.

Q3. The speed of light in vacuum is approximately:

• A) 3×10⁶ m/s
• B) 3×10⁸ m/s
• C) 3×10¹⁰ m/s
• D) 3×10⁴ m/s

Answer: B — Speed of light = approximately 3×10⁸ m/s (299,792,458 m/s).

Q4. Which gas is most abundant in Earth's atmosphere?

• A) Oxygen
• B) Carbon dioxide
• C) Nitrogen
• D) Argon

Answer: C — Nitrogen makes up about 78% of Earth's atmosphere.

Q5. Photosynthesis in plants primarily occurs in:

• A) Roots
• B) Stem
• C) Leaves
• D) Flowers

Answer: C — Photosynthesis occurs mainly in leaves, where chlorophyll is present.

Q6. The chemical symbol for Gold is:

• A) Go
• B) Gd
• C) Au
• D) Ag

Answer: C — Gold's chemical symbol is Au (from Latin 'Aurum').

Q7. Newton's First Law of Motion is also known as:

• A) Law of Action-Reaction
• B) Law of Inertia
• C) Law of Acceleration
• D) Law of Gravity

Answer: B — Newton's First Law is the Law of Inertia — objects remain at rest or in uniform motion unless acted upon by a force.

Q8. Which vitamin is produced by the human body when exposed to sunlight?

• A) Vitamin A
• B) Vitamin B12
• C) Vitamin C
• D) Vitamin D

Answer: D — Vitamin D (calciferol) is synthesized in the skin when exposed to UV rays from sunlight.

Q9. The human heart has how many chambers?

• A) 2
• B) 3
• C) 4
• D) 5

Answer: C — The human heart has 4 chambers: right and left atria, right and left ventricles.

Q10. Sound waves are:

• A) Transverse waves
• B) Longitudinal waves
• C) Electromagnetic waves
• D) Both transverse and longitudinal

Answer: B — Sound waves are longitudinal waves — the particles vibrate in the direction of wave propagation.

Q11. ISRO's Mars Orbiter Mission (Mangalyaan) was launched in:

• A) 2012
• B) 2013
• C) 2014
• D) 2015

Answer: B — Mangalyaan was launched on 5 November 2013.

Q12. Which element has the atomic number 1?

• A) Helium
• B) Oxygen
• C) Hydrogen
• D) Carbon

Answer: C — Hydrogen has atomic number 1 (1 proton).

Q13. The process by which water changes from liquid to gas is called:

• A) Condensation
• B) Evaporation
• C) Sublimation
• D) Precipitation

Answer: B — Evaporation is the process of liquid water turning into water vapour.

Q14. The ozone layer is found in the:

• A) Troposphere
• B) Stratosphere
• C) Mesosphere
• D) Thermosphere

Answer: B — The ozone layer is located in the stratosphere (approximately 15–35 km altitude).

Q15. Wi-Fi uses which type of radiation?

• A) Infrared
• B) Ultraviolet
• C) Radio waves
• D) X-rays

Answer: C — Wi-Fi uses radio waves (specifically in 2.4 GHz and 5 GHz frequency bands).

Q16. Which is India's first indigenously built nuclear submarine?

• A) INS Arihant
• B) INS Vikrant
• C) INS Chakra
• D) INS Viraat

Answer: A — INS Arihant is India's first indigenously built nuclear-powered ballistic missile submarine, commissioned in 2016.

Q17. Blood group 'O' is called the universal donor because:

• A) It has no antigens
• B) It has both A and B antigens
• C) It has Rh factor
• D) It has maximum antibodies

Answer: A — O blood group has no A or B antigens on red blood cells, making it compatible with all blood groups.

Q18. The first artificial satellite launched by the USSR was:

• A) Sputnik 1
• B) Vostok
• C) Mir
• D) Luna 1

Answer: A — Sputnik 1 was launched by the Soviet Union on 4 October 1957 — the first artificial Earth satellite.

Q19. Insulin is produced by which organ?

• A) Liver
• B) Kidney
• C) Pancreas
• D) Thyroid

Answer: C — Insulin is produced by the beta cells of the islets of Langerhans in the pancreas.

Q20. The SI unit of pressure is:

• A) Pascal
• B) Newton
• C) Bar
• D) Torr

Answer: A — The SI unit of pressure is Pascal (Pa) = N/m².