Top 10 RRB NTPC General Science Questions
RRB NTPC exams include several General Science questions that are straightforward but require revision. Here are the top 10 General Science questions, based on recent trends.
🔬 Top 10 General Science Questions
1. Which of the following is a unit of acceleration?
Options:
- A) m/s²
- B) ft/s
- C) m/s
- D) m²/s
Answer: A) m/s²
Explanation: Acceleration is the rate of change of velocity per second, so its unit is meters per second squared.
2. The electric bulb’s filament is made of which material?
Options:
- A) Copper
- B) Platinum
- C) Tungsten
- D) None
Answer: C) Tungsten
Explanation: Tungsten is used because it has a high melting point and emits bright light when heated.
3. When light ray passes from denser to rarer medium, what happens?
Options:
- A) It speeds up and bends away from normal
- B) It slows and bends towards normal
- C) It speeds up and bends towards normal
- D) None of these …
Answer: A) It speeds up and bends away from normal
Explanation: This is due to Snell’s law, which states that light bends away from the normal when moving from a denser to a rarer medium.
4. The sum of change in kinetic and potential energy is always:
Options:
- A) Zero
- B) Positive
- C) Negative
- D) None
Answer: A) Zero
Explanation: According to the work–energy theorem, for conservative systems, the total mechanical energy remains constant.
5. Pressure inside a soap bubble is:
Options:
- A) More than atmospheric
- B) Less
- C) Equal
- D) Half
Answer: A) More than atmospheric
Explanation: The curved surface creates extra pressure inside than outside.
6. Which law governs the heating effect of electric current?
Options:
- A) Joule’s Law
- B) Ohm’s Law
- C) Faraday’s Law
- D) Newton’s Law
Answer: A) Joule’s Law
Explanation: This law states heat produced is proportional to current squared times resistance.
7. Unit of pressure is Pascal. Which is not measured in Pascals?
Options:
- A) Moment of inertia
- B) Pressure
- C) Stress
- D) Young’s modulus
Answer: A) Moment of inertia
Explanation: It’s measured in kg·m², while pressure, stress, and modulus use Pascal.
8. In case of negative work, the angle between force and displacement is:
Options:
- A) 0°
- B) 45°
- C) 90°
- D) 180°
Answer: D) 180°
Explanation: Negative work means force opposes displacement, which means angle is 180°.
9. Electric bulb glows—what happens to energy?
Options:
- A) Fully to light
- B) Partly light, partly heat
- C) Light to electrical
- D) Electrical to magnetic
Answer: B) Partly light, partly heat
Explanation: Most input electrical energy in a bulb becomes heat; only some becomes light.
10. Which of these is a navigation satellite?
Options:
- A) GSLV
- B) PSLV
- C) IRNSS
- D) SLV-3
Answer: C) IRNSS
Explanation: The Indian Regional Navigation Satellite System is rightfully a navigation satellite.
✅ Quick tips:
- Focus on basic principles—questions here are clear and repeat often.
- Practice regularly to remember units and laws.
- Use daily quizzes to strengthen weak areas.