Science MCQs (Physics):
Physics MCQs – Set 4
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Science MCQs (Physics) – Set 4
Level: Very Hard / Advanced (Numerical + Conceptual)
Useful for SSC, Railway, HP SET, NDA, State PCS
Physics MCQs – Set 4 (20 Questions with Explanation)
1. A body is thrown vertically upward with velocity 20 m/s. What is the maximum height reached?
(g = 10 m/s²)
A. 10 m
B. 20 m
C. 25 m
D. 40 m
✅ Answer: C. 25 m
📘 Explanation:
v² = u² − 2gh
0 = (20)² − 2×10×h
h = 400/20 = 25 m
2. Which graph represents uniform motion?
A. Distance–time straight line
B. Velocity–time curve
C. Acceleration–time curve
D. Distance–time curve
✅ Answer: A
📘 Explanation: Uniform motion gives a straight line in distance–time graph.
3. If resistance is tripled, current becomes:
(Voltage constant)
A. 3 times
B. 1/3 times
C. 9 times
D. No change
✅ Answer: B
📘 Explanation: By Ohm’s law I = V/R, increasing R reduces current.
4. The dimensional formula of energy is:
A. [MLT⁻²]
B. [ML²T⁻²]
C. [M²LT⁻²]
D. [ML⁻¹T⁻²]
✅ Answer: B
📘 Explanation: Energy = Work = Force × distance.
5. A lens has focal length −20 cm. The lens is:
A. Convex
B. Concave
C. Cylindrical
D. Plane
✅ Answer: B
📘 Explanation: Negative focal length indicates concave lens.
6. What happens to pressure when area is halved (force constant)?
A. Halved
B. Doubled
C. Same
D. Zero
✅ Answer: B
📘 Explanation: Pressure = Force/Area, smaller area → higher pressure.
7. The speed of sound is maximum in:
A. Air
B. Water
C. Vacuum
D. Steel
✅ Answer: D
📘 Explanation: Sound travels fastest in solids.
8. Which law states “Energy can neither be created nor destroyed”?
A. Newton’s law
B. First law of thermodynamics
C. Second law of thermodynamics
D. Ohm’s law
✅ Answer: B
📘 Explanation: Law of conservation of energy.
9. The phenomenon responsible for mirage is:
A. Reflection
B. Refraction
C. Total internal reflection
D. Dispersion
✅ Answer: C
📘 Explanation: Mirage occurs due to total internal reflection.
10. A wire of resistance R is cut into two equal parts. New resistance is:
A. R
B. R/2
C. 2R
D. R/4
✅ Answer: B
📘 Explanation: Resistance ∝ length, halving length halves resistance.
11. Which electromagnetic radiation has highest energy?
A. X-rays
B. Infrared
C. Radio waves
D. Gamma rays
✅ Answer: D
📘 Explanation: Energy ∝ frequency, gamma rays have highest frequency.
12. The unit of electric power is:
A. Joule
B. Volt
C. Ampere
D. Watt
✅ Answer: D
📘 Explanation: Power = Work/time.
13. What is the efficiency of a machine if output work = 80 J and input work = 100 J?
A. 20%
B. 80%
C. 100%
D. 125%
✅ Answer: B
📘 Explanation: Efficiency = (Output/Input) × 100 = 80%.
14. Which type of current is used in household supply?
A. DC
B. AC
C. Pulsating DC
D. Mixed
✅ Answer: B
📘 Explanation: Household electricity is AC.
15. A body floats when:
A. Its density is greater than liquid
B. Its density is equal to liquid
C. Its density is less than liquid
D. Its weight is zero
✅ Answer: C
📘 Explanation: Lower density than liquid causes floating.
16. Which lens is used in a camera?
A. Concave
B. Convex
C. Plane
D. Cylindrical
✅ Answer: B
📘 Explanation: Convex lens forms real images on film/sensor.
17. What happens to wavelength when frequency increases?
A. Increases
B. Decreases
C. Same
D. Zero
✅ Answer: B
📘 Explanation: λ = v/f, higher frequency → shorter wavelength.
18. Which law explains heating effect of current?
A. Joule’s law
B. Faraday’s law
C. Ohm’s law
D. Lenz’s law
✅ Answer: A
📘 Explanation: Joule’s law of heating.
19. The SI unit of capacitance is:
A. Ohm
B. Henry
C. Farad
D. Tesla
✅ Answer: C
📘 Explanation: Capacitance is measured in Farad.
20. What is the nature of image formed by a convex mirror?
A. Real and inverted
B. Virtual and erect
C. Real and erect
D. Virtual and inverted
✅ Answer: B
📘 Explanation: Convex mirrors always form virtual, erect images.
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