A magnetic field cannot MCQ with Answer and Explanation

A magnetic field cannot
A. Exert force on a charge
B. Change momentum of a charge
C. Change kinetic energy of a charge
D. Accelerate a charge
Answer: Option C
Solution (By JKSSB Mock Tests)
Magnetic force perpendicular to velocity, work zero, KE constant.

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Practice More Physics Questions

Question #1
The SI unit of electric current is
A. Volt
B. Ampere
C. Ohm
D. Coulomb

Correct Answer: Option B


Explanation:
Ampere (A) is base unit, defined via force between conductors. 1 A = 1 C/s. Coulomb is charge. Volt potential. Ohm resistance.

This question belongs to: Science Physics
Question #2
The binding energy per nucleon is maximum for:
A. Uranium
B. Hydrogen
C. Helium
D. Iron

Correct Answer: Option D


Explanation:
Binding energy per nucleon peaks around iron-56 (≈8.8 MeV/nucleon), making it the most stable nucleus. Lighter nuclei release energy via fusion; heavier via fission. Hydrogen has near-zero binding energy per nucleon; uranium ≈7.6 MeV/nucleon. Memory aid: 'Iron peak: most stable nucleus; fusion before, fission after'. This nuclear physics concept is frequently tested in competitive exams. Always link binding energy curve to energy release in stars (fusion) and reactors (fission).

This question belongs to: Science Physics
Question #3
A moving coil galvanometer can be converted into a voltmeter by connecting
A. Low resistance in parallel
B. Low resistance in series
C. High resistance in parallel
D. High resistance in series

Correct Answer: Option D


Explanation:
High resistance in series limits current and extends voltage range.

This question belongs to: Science Physics