Agniveer Army Technical Electromagnetic Induction & Optics Questions
Top 20 Practice MCQs — with Solutions & Shortcuts
This page covers the top 20 Agniveer Army Technical Electromagnetic Induction & Optics questions with full solutions, difficulty grading, and exam-specific shortcuts. All 5 subtopics are covered with graded practice MCQs.
Which statement correctly describes a property of electromagnetic waves?
Q2Easy
A convex lens of focal length 10 cm is used as a simple microscope. An object is placed at 5 cm from the lens. What is the nature of the image formed?
Q3Easy
Which of the following correctly represents the relationship between electric field (E), magnetic field (B), and velocity (c) in an electromagnetic wave?
Q4Easy
The frequency of an electromagnetic wave is 2 × 10¹⁵ Hz. What is the energy of a single photon of this wave? (Use h = 6.6 × 10⁻³⁴ J·s)
Q5Easy
The frequency of an alternating current in India is 50 Hz. What is its time period?
Q6Easy
The power of a lens is –5 diopters. What is its focal length and type?
Q7Easy
An AC circuit has a pure resistor of 50 Ω connected to an AC source of RMS voltage 200 V. What is the RMS current through the resistor?
Q8Easy
The speed of electromagnetic waves in vacuum is approximately 3 × 10⁸ m/s. If the frequency of an electromagnetic wave is 6 × 10¹⁴ Hz, what is its wavelength?
Q9Easy
An electromagnetic wave has a wavelength of 4 × 10⁻⁷ m in vacuum. To which region of the electromagnetic spectrum does it belong?
Q10Easy
According to Lenz's law, the direction of induced current in a coil is such that it:
Q11Easy
A straight conductor of length 0.8 m moves perpendicular to a magnetic field of 0.5 T with velocity 10 m/s. What is the motional EMF induced across the conductor?
Q12Easy
The SI unit of magnetic flux is:
Q13Easy
A convex lens has a focal length of 20 cm. An object is placed at a distance of 60 cm from the lens. What is the nature and position of the image formed?
Q14Easy
A concave mirror has a radius of curvature of 40 cm. An object is placed at the center of curvature. What is the magnification of the image?
Q15Easy
An alternating current is represented as i = 10 sin(100πt) amperes. What is the RMS value of this current?
Q16Easy
A sinusoidal AC voltage has a peak value of 220 V. What is its RMS voltage?
Q17Easy
A coil with 200 turns has a magnetic flux change of 0.04 Wb in 0.02 seconds. Calculate the induced EMF.
Q18Easy
The equation of an alternating EMF is ε = 150 sin(314t) volts. What is the frequency of this AC source?
Q19Easy
A rectangular coil of area 0.5 m² is placed perpendicular to a magnetic field of 2 T. If the magnetic field changes to 5 T in 0.1 seconds, what is the magnitude of induced EMF?
Q20Easy
A concave lens has a focal length of 15 cm. An object is placed at 30 cm from the lens. What is the distance of the image from the lens?
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