UPSC Naval Academy (NA) MCQs

Prepare for the UPSC Naval Academy (NA) exam with a wide collection of multiple-choice questions (MCQs). These MCQs cover key subjects like Mathematics, Physics, and General Knowledge, in line with the actual exam pattern. Practicing these questions will help you improve your problem-solving skills, enhance your time management, and ensure you're fully prepared for the written test. Whether you're revising core concepts or testing your readiness for the exam, our Naval Academy MCQs will be an invaluable resource to help you succeed in the UPSC NDA NA exam and begin a prestigious career in the Indian Navy.

Q1. What is the value of cos 60°?

Correct Answer: A

cos 60° is 0.5.

Q2. Simplify: (2x^3)(5x^2)

Correct Answer: C

Product is 2*5 =10 and x^(3+2) = x^5.

Q3. Who was the first Prime Minister of India?

Correct Answer: B

Jawaharlal Nehru was the first Prime Minister.

Q4. Water boils at what temperature at sea level?

Correct Answer: C

Water boils at 100°C at sea level.

Q5. The chemical formula of table salt is?

Correct Answer: A

Table salt is sodium chloride NaCl.

Q6. What is the speed of sound in air at sea level?

Correct Answer: B

Speed of sound at sea level is approximately 343 m/s.

Q7. Which organ is responsible for pumping blood?

Correct Answer: A

Heart pumps blood through the body.

Q8. The Earth revolves around the Sun in:

Correct Answer: A

Earth takes approximately 365 days for one revolution.

Q9. Which gas is essential for human respiration?

Correct Answer: B

Oxygen is essential for respiration.

Q10. What is the next prime number after 11?

Correct Answer: B

13 is the next prime after 11.

Q11. Who wrote the national anthem of India?

Correct Answer: A

Rabindranath Tagore wrote it.

Q12. The formula H2SO4 refers to which acid?

Correct Answer: B

H2SO4 is sulfuric acid.

Q13. The freezing point of water is:

Correct Answer: A

Water freezes at 0°C.

Q14. Simplify: 4 + 3 × 2

Correct Answer: A

According to order of operations, 3×2=6, plus 4 is 10.

Q15. What planet is called Red Planet because of its color?

Correct Answer: A

The planet known as the Red Planet is Mars. Mars Mars is called the Red Planet because it appears reddish when observed from Earth, especially in the night sky. This distinctive color comes from iron oxide (rust) that is widespread on its surface and in its dust. Over billions of years, iron in the Martian soil has reacted with oxygen, forming rust-like compounds that give the planet its characteristic red-orange appearance. Mars is the fourth planet from the Sun and is smaller than Earth, with about half its diameter. It has a thin atmosphere mostly made of carbon dioxide, which is not thick enough to support liquid water on the surface under normal conditions today. However, scientists believe that in the distant past, Mars may have had rivers, lakes, and possibly conditions that could have supported microbial life. Because of its color and relatively close visibility from Earth, Mars has been known since ancient times and was named after the Roman god of war due to its blood-like red appearance in the sky.

Q16. Which vitamin helps in clotting of blood?

Correct Answer: D

Vitamin K is essential for blood clotting.

Q17. Who was the first President of India?

Correct Answer: A

Rajendra Prasad was the first President.

Q18. What is the chemical symbol for Iron?

Correct Answer: B

Fe is the chemical symbol for Iron.

Q19. The largest continent by land area is?

Correct Answer: B

Asia is the largest continent.