Work moving charge on equipotential surface: MCQ with Answer and Explanation

Work moving charge on equipotential surface:
A. qV
B. Infinite
C. Path dependent
D. Zero
Answer: Option D
Solution (By JKSSB Mock Tests)
Equipotential: ΔV = 0 ⇒ W = qΔV = 0. Electric field perpendicular to equipotentials. Memory aid: 'Equipotential: no work to move charge along it'. Electrostatics concept frequently tested in competitive exams.

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Practice More Physics Questions

Question #1
A 2 kg mass moving at 4 m/s collides elastically with a stationary 2 kg mass. After collision, first mass
A. Moves with 2 m/s
B. Moves with 1 m/s
C. Stops
D. Rebounds with 4 m/s

Correct Answer: Option C


Explanation:
Equal masses elastic collision: velocities swap. Moving mass stops, stationary moves with 4 m/s.

This question belongs to: Science Physics
Question #2
Dispersion of white light through a prism occurs because
A. White light is composed of seven colours
B. Different colours have same speed in glass
C. Refractive index is different for different colours
D. Prism absorbs colours

Correct Answer: Option C


Explanation:
Dispersion is splitting of light into constituent colours due to variation of refractive index with wavelength. Violet deviates most, red least. Prism doesn't absorb but disperses. Rainbow formation is due to dispersion, refraction, reflection in water droplets.

This question belongs to: Science Physics
Question #3
The frequency of a wave is 1 kHz. Its time period is
A. 0.001 s
B. 1 s
C. 0.01 s
D. 1000 s

Correct Answer: Option A


Explanation:
T = 1/f = 1/1000 = 0.001 s = 1 ms.

This question belongs to: Science Physics