Electromagnetic waves Additional Practice Test

12th Standard Physics — Electromagnetic waves: Additional Online Practice Test

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Which term did James Clerk Maxwell introduce to Ampere's circuital law to explain the production of magnetic fields by time-varying electric fields?

A.Conduction current B.Displacement current C.Eddy current D.Static current

What physical reality is implied by the Maxwell's second equation (Gauss's law for magnetism), which states that the surface integral of a magnetic field over a closed surface is zero?

A.Magnetic monopoles exist in pairs B.Isolated magnetic monopoles do not exist C.Magnetic field lines are discontinuous D.Magnetic field depends on time

In a vacuum, what is the mathematical relationship between the speed of light \(c\), the permittivity of free space \(\epsilon_0\), and the permeability of free space \(\mu_0\)?

A.\(c = \sqrt{\mu_0 \epsilon_0}\) B.\(c = \frac{1}{\mu_0 \epsilon_0}\) C.\(c = \frac{1}{\sqrt{\mu_0 \epsilon_0}}\) D.\(c = \mu_0 \epsilon_0\)

If an electromagnetic wave is propagating along the positive z-direction and its electric field vector points along the x-axis, in which direction does the magnetic field vector oscillate?

A.Along the x-axis B.Along the y-axis C.Along the z-axis D.Opposite to the x-axis

What was the significant conclusion drawn from Heinrich Hertz's 1888 experiment regarding the receiver's orientation?

A.EM waves are longitudinal B.EM waves require a medium C.EM waves are transverse D.EM waves have infinite speed

Radio waves are primarily produced by which of the following physical processes?

A.Sudden stopping of high-speed electrons B.Accelerated motion of charges in conducting wires C.Transitions of radioactive nuclei D.Rotational transitions of molecules

Which type of electromagnetic radiation is extensively used in radar systems for aircraft navigation and speed detection of vehicles?

A.Infrared radiation B.Visible light C.Microwaves D.X-rays

Why are infrared radiations often referred to as 'heat waves'?

A.They have the highest frequency B.They are produced by hot bodies and molecules C.They are visible to the human eye D.They ionize atmospheric gases

Which constituent of the Earth's atmosphere is primarily responsible for absorbing harmful ultraviolet (UV) radiation from the Sun?

A.Nitrogen B.Oxygen C.Ozone D.Carbon dioxide

Q10

How are X-rays produced in a laboratory setting for medical applications?

A.By radioactive decay of nuclei B.By sudden stopping of high-speed electrons at a target C.By heating metals to high temperatures D.By passing current through a coil

Q11

Gamma rays are distinct from other electromagnetic waves because they originate from which source?

A.Transitions in the outermost electron shells B.Oscillating molecular dipoles C.Transitions of radioactive nuclei D.Vibrating hot solid bodies

Q12

What type of emission spectrum is obtained from incandescent solids and the light from a carbon arc?

A.Line emission spectrum B.Continuous emission spectrum C.Band emission spectrum D.Line absorption spectrum

Q13

The discrete dark lines observed in the solar spectrum, known as Fraunhofer lines, are examples of which type of spectrum?

A.Line emission spectrum B.Line absorption spectrum C.Band emission spectrum D.Continuous absorption spectrum

Q14

Calculate the refractive index of a medium if its relative permeability is 1.0 and its relative electrical permittivity (dielectric constant) is 2.25.

A.1.25 B.1.50 C.2.25 D.3.00

Q15

If an electromagnetic wave of energy \(U\) is incident on a surface and is completely absorbed, what is the magnitude of the linear momentum \(p\) imparted to the surface?

A.\(p = U \cdot c\) B.\(p = \frac{U}{c}\) C.\(p = \frac{2U}{c}\) D.\(p = \sqrt{U \cdot c}\)

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About this Electromagnetic waves test

This free online practice test covers Electromagnetic waves from the 12th Standard Physics (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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