Showing 11–20 of 100 questions
in General Science
Q.11
Medium
General Science
What is the SI unit of force?
A
Dyne
B
Newton
C
Joule
D
Pascal
Correct Answer:
B. Newton
Explanation:
Newton (N) is the SI unit of force. 1 Newton = 1 kg·m/s². Dyne is CGS unit, Joule is energy, Pascal is pressure.
Q.12
Medium
General Science
Which of the following is a conductor of electricity?
A
Rubber
B
Plastic
C
Copper
D
Ceramic
Correct Answer:
C. Copper
Explanation:
Copper is an excellent conductor of electricity due to free electrons. Rubber, plastic, and ceramic are insulators.
Q.13
Medium
General Science
The freezing point of water at standard atmospheric pressure is:
A
0°C
B
32°F
C
273.15 K
D
All of the above
Correct Answer:
D. All of the above
Explanation:
All three represent the same freezing point of water: 0°C, 32°F, and 273.15 K are equivalent.
Q.14
Medium
General Science
Which vitamin is produced by our skin when exposed to sunlight?
A
Vitamin A
B
Vitamin B
C
Vitamin C
D
Vitamin D
Correct Answer:
D. Vitamin D
Explanation:
Vitamin D is synthesized by our skin when exposed to ultraviolet-B (UVB) radiation from sunlight.
Q.15
Medium
General Science
What is the process by which water changes from liquid to gas?
A
Condensation
B
Sublimation
C
Evaporation
D
Freezing
Correct Answer:
C. Evaporation
Explanation:
Evaporation is the process where liquid water turns into water vapor/gas. This occurs at any temperature on the water's surface.
Q.16
Hard
General Science
Which of the following is a vector quantity?
A
Speed
B
Temperature
C
Velocity
D
Distance
Correct Answer:
C. Velocity
Explanation:
Velocity is a vector quantity as it has both magnitude and direction. Speed, temperature, and distance are scalar quantities.
Q.17
Hard
General Science
The phenomenon where light bends while passing from one medium to another is called:
A
Reflection
B
Refraction
C
Diffraction
D
Dispersion
Correct Answer:
B. Refraction
Explanation:
Refraction is the bending of light when it passes from one transparent medium to another with different optical density.
Q.18
Hard
General Science
Which element is the most abundant in the Earth's crust?
A
Iron
B
Oxygen
C
Silicon
D
Aluminum
Correct Answer:
B. Oxygen
Explanation:
Oxygen is the most abundant element in Earth's crust, comprising about 46% of its composition.
Q.19
Hard
General Science
The theory that explains the motion of planets around the sun is:
A
Newton's First Law
B
Kepler's Laws of Planetary Motion
C
Law of Conservation of Energy
D
Coulomb's Law
Correct Answer:
B. Kepler's Laws of Planetary Motion
Explanation:
Kepler's Laws of Planetary Motion describe how planets orbit the sun in elliptical paths with the sun at one focus.
Q.20
Hard
General Science
In the context of railways, which type of braking system provides the fastest stopping power?
A
Air brake
B
Hydraulic brake
C
Regenerative brake
D
Magnetic brake
Correct Answer:
D. Magnetic brake
Explanation:
Magnetic brakes provide rapid and controlled stopping. Regenerative brakes are energy-efficient but slower. Air/hydraulic are conventional systems.
