Science MCQs (Physics):
Physics MCQs – Set 5
🎓 Welcome to edusoars.blogspot.com!
Your trusted platform for mastering competitive exams.
We provide a comprehensive and ever-expanding library of Multiple Choice Questions (MCQs) designed not just for practice, but for true conceptual mastery.
What We Cover:
Our expert-curated MCQs span a wide array of high-demand subjects, including:
* Technology & Engineering: Computer Science, Engineering
* Core Academics: Mathematics, Science
* Testing Skills: Aptitude, Reasoning
* General Awareness: General Knowledge
Why Choose Edusoars?
We help you turn practice time into measurable progress:
* Conceptual Clarity: Every single MCQ is accompanied by a detailed, insightful explanation. This is crucial—you don't just learn what the answer is, you understand the concept behind the solution, allowing you to learn effectively from every mistake.
* Realistic Readiness: Test your knowledge with our variety of practice quizzes and simulated tests. They are designed to be as realistic as possible, helping you benchmark your performance and build exam-day confidence.
* Content That Grows: We are constantly adding new material across all subjects, ensuring you always have fresh, relevant content that reflects the latest exam patterns.
> Stop hoping you're prepared. Start knowing you are.
If you are serious about succeeding in your competitive exams, edusoars.blogspot.com is the strategic resource you need to reach your goals.
Science MCQs (Physics) – Set 5
Level: Ultra Hard / Exam-Trap MCQs (Concept + Numerical + Reasoning)
Useful for SSC, Railway, HP SET, NDA, State PCS
Physics MCQs – Set 5 (20 Questions with Explanation)
1. A body is projected horizontally from a tower. The horizontal velocity remains constant because:
A. No gravitational force acts
B. Air resistance is zero
C. Gravity acts vertically downward
D. Mass of body is constant
✅ Answer: C
📘 Explanation: Gravity has no horizontal component, so horizontal velocity remains constant.
2. The slope of a velocity–time graph represents:
A. Speed
B. Distance
C. Acceleration
D. Displacement
✅ Answer: C
📘 Explanation: Slope = change in velocity / time = acceleration.
3. If force acting on a body is doubled and mass is halved, acceleration becomes:
A. Same
B. Double
C. Four times
D. Half
✅ Answer: C
📘 Explanation: a = F/m → (2F)/(m/2) = 4a.
4. The dimensional formula of gravitational constant (G) is:
A. [M⁻¹L³T⁻²]
B. [MLT⁻²]
C. [M⁻²L²T⁻¹]
D. [ML²T⁻²]
✅ Answer: A
📘 Explanation: From Newton’s law of gravitation.
5. Two bulbs of 40 W and 60 W are connected in series. Which glows brighter?
A. 40 W
B. 60 W
C. Both same
D. Depends on voltage
✅ Answer: A
📘 Explanation: In series, same current flows; higher resistance (40 W) dissipates more power.
6. The escape velocity of Earth depends on:
A. Mass of object
B. Shape of Earth
C. Mass and radius of Earth
D. Rotation of Earth
✅ Answer: C
📘 Explanation: vₑ = √(2GM/R).
7. In Young’s double slit experiment, fringe width depends on:
A. Slit width
B. Distance between slits
C. Wavelength of light
D. Intensity of light
✅ Answer: C
📘 Explanation: Fringe width ∝ wavelength.
8. Which device converts AC into DC?
A. Transformer
B. Rectifier
C. Generator
D. Inductor
✅ Answer: B
📘 Explanation: Rectifier converts AC to DC.
9. A satellite revolves around Earth because:
A. No gravity acts
B. Gravity provides centripetal force
C. Air pressure acts
D. Earth repels satellite
✅ Answer: B
📘 Explanation: Gravitational force acts as centripetal force.
10. Which wave property determines pitch of sound?
A. Amplitude
B. Velocity
C. Frequency
D. Wavelength
✅ Answer: C
📘 Explanation: Higher frequency → higher pitch.
11. A fuse wire has:
A. High melting point
B. Low melting point
C. High resistance and high melting point
D. Low resistance
✅ Answer: B
📘 Explanation: Fuse melts quickly due to low melting point.
12. The unit of electric field is:
A. Volt
B. Volt/meter
C. Coulomb
D. Tesla
✅ Answer: B
📘 Explanation: Electric field = force/charge = V/m.
13. Which phenomenon confirms particle nature of light?
A. Interference
B. Diffraction
C. Photoelectric effect
D. Refraction
✅ Answer: C
📘 Explanation: Photoelectric effect shows particle nature.
14. The work done in circular motion is zero because:
A. Speed is constant
B. Force is zero
C. Force is perpendicular to displacement
D. Displacement is zero
✅ Answer: C
📘 Explanation: Centripetal force ⟂ displacement → no work.
15. Which material has negative temperature coefficient of resistance?
A. Copper
B. Iron
C. Nichrome
D. Semiconductor
✅ Answer: D
📘 Explanation: Resistance of semiconductors decreases with temperature.
16. The power factor in AC circuit is:
A. V/I
B. I/V
C. cosφ
D. sinφ
✅ Answer: C
📘 Explanation: Power factor = cosφ.
17. Which electromagnetic wave is used in remote control?
A. Radio waves
B. Infrared rays
C. Ultraviolet rays
D. X-rays
✅ Answer: B
📘 Explanation: Remote controls use infrared radiation.
18. When a ray of light enters glass from air, its speed:
A. Increases
B. Decreases
C. Remains same
D. Becomes zero
✅ Answer: B
📘 Explanation: Light slows down in denser medium.
19. A transformer cannot work on DC because:
A. High voltage
B. No magnetic field
C. No change in magnetic flux
D. High resistance
✅ Answer: C
📘 Explanation: Transformer needs changing magnetic flux (AC).
20. Which quantity remains conserved in elastic collision?
A. Kinetic energy only
B. Momentum only
C. Both momentum and kinetic energy
D. Potential energy
✅ Answer: C
📘 Explanation: Elastic collision conserves both momentum and kinetic energy.
Thank you for visiting! We wish you the absolute best of luck in your studies!
