Free Electromagnetism MCQs with Answers
1,176 Electromagnetism MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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Read the Electromagnetism notesFree MDCAT chapter notes with key terms1,176 questions · page 55 of 59
- A. Low resistance in parallel
- B. Low resistance in series
- C. High resistance in parallel
- D. High resistance in series
Explanation: To convert a galvanometer into a voltmeter, you need to connect a resistor in series with it.
Correct answer: High resistance in series- A. Charge
- B. Current
- C. Resistance
- D. Potential difference
Explanation: An avometer (multimeter) can measure current, resistance, and potential difference, but it does not directly measure electric charge.
Correct answer: Charge- A. A helix
- B. Straight line
- C. A circle
- D. Ellipse
Explanation: When a charged particle, such as an electron, enters a magnetic field perpendicularly (at a right angle) to the direction of the magnetic…
Correct answer: A circle- A. Counter clockwise
- B. Clockwise
- C. Zero
- D. Up the left edge and from right to left along the top edge
Explanation: As the square loop of wire lies in the plane of the page and the increasing magnetic field is directed into the page, then according to…
Correct answer: Counter clockwise- A. Zero
- B. Clockwise
- C. Counter clockwise
- D. Clockwise in the left side and counterclockwise in the right side
Explanation: As the constant current carrying wire is moving towards the rectangular loop, it causes an increased magnetic flux in the loop.
Correct answer: Counter clockwise- A. 50 times
- B. 200 times
- C. 100 times
- D. 150 times
Explanation: The explanation is: In one cycle, the current becomes maximum twice (positive peak and negative peak).
Correct answer: 100 times- A. Its peak value
- B. Its average value
- C. That steady current that produces the same rate of heating in a resistor as the actual current
- D. That steady current that will charge a battery at the same rate as the actual current
Explanation: The rms value of an current is that steady current that produces the same rate of heating in a resistor as the actual current.
Correct answer: That steady current that produces the same rate of heating in a resistor as the actual current- A. Iron is cheaper than copper
- B. Iron is a good conductor of current
- C. Iron is a good magnetic substance
- D. Iron has high melting point
Explanation: In order enhance the magnetic flux, the primary and secondary coils of transformer are wound on soft iron core and also hysteresis loop…
Correct answer: Iron is a good magnetic substance- A. Small
- B. May be small or may be maximum
- C. Maximum
- D. Zero
Explanation: Flux coupling between primary and secondary coils must be maximum.
Correct answer: Maximum- A. Self-induction
- B. Motional e.m.f
- C. Mutual induction
- D. None of these
Explanation: The fundamental operation of an AC Motor depends on the principle of magnetism.
Correct answer: None of these- A. Remain same
- B. Decreased
- C. Increased
- D. Maximum
Explanation: When a step-up transformer increases the voltage, the corresponding effect on the current is inverse: the current will decrease.
Correct answer: Decreased- A. A metal is kept in varying magnetic field
- B. A metal is kept in steady magnetic field
- C. A circular coil is placed in a steady magnetic field
- D. A current is passed through a circular coil
Explanation: Therefore, the correct option is A) A metal is kept in a varying magnetic field.
Correct answer: A metal is kept in varying magnetic field- A. galvanometer
- B. ammeter
- C. voltmeter
- D. all of the above
Explanation: A galvanometer functions like a motor. A galvanometer is an instrument that detects and measures small electric currents.
Correct answer: galvanometer- A. mere
- B. which
- C. to be
- D. living
Explanation: The error in the sentence is in option (B) "which." It should be corrected to "that" to introduce a restrictive clause properly.
Correct answer: which- A. Distant
- B. Devoted
- C. Vindictive
- D. Pitiless
Explanation: Being attached to something or someone displays dedication or devotion.
Correct answer: Devoted- A. be
- B. are
- C. is
- D. were
Explanation: In this sentence, the subject "Whatever they want to do" is a singular noun clause, so the verb should also be singular.The subject is…
Correct answer: is1097. Choose the correct one.
- A. You can't drive over the five miles an hour down any street in New York.
- B. You can't drive over five miles the hour down the any street in New York.
- C. You can't drive over five miles an hour down any street in New York.
- D. You can't drive over five miles an hour down any street in the New York.
Explanation: The correct answer is C. You can't drive over five miles an hour down any street in New York.
Correct answer: You can't drive over five miles an hour down any street in New York.- A. Statement I is the cause and statement II is its effect
- B. Statement II is the cause and statement I is its effect
- C. Both the statements I and II are independent causes
- D. Both the statements I and II are effects of independent causes.
Explanation: The recurring problem of late results (Statement II) is the cause. The university's decision to change the exam schedule (Statement I) is…
Correct answer: Statement II is the cause and statement I is its effect- A. If only I is most appropriate
- B. If only II is most appropriate
- C. If either I or II is most appropriate
- D. If neither I nor II is most appropriate
Explanation: Action I directly addresses the problem by creating a system of accountability to deter future vandalism.
Correct answer: If only I is most appropriate- A. Momentum
- B. Torque
- C. Force
- D. Impulse
Explanation: The working principle of a galvanometer is indeed based on the torque that acts on a current-carrying coil placed within a magnetic field.
Correct answer: Torque