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Electromagnetic Waves Physics - Electromagnetic Waves

Tamil Nadu Board - STD 12 - Physics (Tamil - English Medium). 83 questions in this chapter.

Question types

Electromagnetic Waves question types

83 questions across 7 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

83
Questions
7
Question groups
5
Question types
Sample Questions

Electromagnetic Waves questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 16Assertion and reason type2 Marks
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
(c) If assertion is true but-reason is false.
(d) If the assertion and reason both are false.
(e) If the assertion is false but reason is true.
Assertion:In the visible spectrum of light, red light is more energetic than green light.
Reason:The wavelength of red light is more than that of green light.
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Q 17Assertion and reason type2 Marks
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
(c) If assertion is true but-reason is false.
(d) If the assertion and reason both are false.
(e) If the assertion is false but reason is true.
Assertion: Radio waves bend in a magnetic field.
Reason: Radio waves are electromagnetic in nature.
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Q 18Assertion and reason type2 Marks
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
(c) If assertion is true but-reason is false.
(d) If the assertion and reason both are false.
(e) If the assertion is false but reason is true.
Assertion: Only microwaves are used in RADAR.
Reason: Because microwaves have a very small wavelengths.
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Q 19Assertion and reason type2 Marks
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
(c) If assertion is true but-reason is false.
(d) If the assertion and reason both are false.
(e) If the assertion is false but reason is true.
Assertion: Ultraviolet radiation is of higher frequency waves that are dangerous to a human being.
Reason: Ultraviolet radiation are absorbed by the atmosphere.
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Q 20Assertion and reason type2 Marks
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
(c) If assertion is true but-reason is false.
(d) If the assertion and reason both are false.
(e) If the assertion is false but reason is true.
Assertion: In the Hertz experiment, the electric vector of radiation produced by the source gap is parallel to the gap.
Reason: Production of sparks between the detector gap is maximum when it is placed perpendicular to the source gap.
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Q 21Match the following.4 Marks
(i) Continuous emission spectra – (a) Atomic hydrogen
(ii) Line emission spectra – (b) Ammonia gas
(iii) Band emission spectra – (c) Incandescent solids
(iv) Band absorption spectra – (d) Blood (or) chlorophyl
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Q 22Match the following.4 Marks
(i) Gamma ray – (a) Structure of molecules
(ii) Visible light – (b) Treatment of cancer
(iii) UV radiation – (c) Detecting fractures
(iv) X-rays – (d) Destroy bacteria
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Q 23Match the following.4 Marks
(i) Gauss Law - (a) Electromagnetic induction
(ii) Faraday's Law - (b) $\varphi=\frac{q}{\varepsilon_0}$
(iii) Speed of light - (c) Electromagnetic oscillators
(iv) Microwaves - (d) $3 \times 10^8 ms ^{-1}$

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Q 25Numerical Problems5 Marks
Light With an energy flux of $25 \times 10^4 Wm ^{-2}$ falls on a perfectly reflecting surface at normal incidence. If the surface area is $15 cm ^2$, calculate the average force exerted on the surface.
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Q 28Numerical Problems5 Marks
Electromagnetic waves travel in a medium at a speed of $2 \times 10^8 ms ^{-1}$. The relative permeability of the medium is 1 . Find the relative permittivity.
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Q 29Numerical Problems5 Marks
The voltage between the plates of a parallel - plate capacitor of capacitance 1 $\mu F$ is changing at the rate of $5 Vs ^{-1}$. What is the displacement current in the capacitor?
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