Plus Two Physics Chapter Wise Previous Questions Chapter 8 Electromagnetic Waves

Plus Two Physics Chapter Wise Previous Questions Chapter 8 Electromagnetic Waves is part of Kerala Plus Two Physics Chapter Wise Previous Questions and Answers Kerala. Here we have given Plus Two Physics Chapter Wise Questions and Answers Chapter 8 Electromagnetic Waves.

Kerala Plus Two Physics Chapter Wise Previous Questions and Answers Chapter 8 Electromagnetic Waves

Question 1.
a) It is possible to exert an pressure on an object by shining a beam of light from a small lamp filament. Why? (March – 2009)
b) Lasers can produce much higher pressure than a beam of light from a small lamp filament. Why?
Answer:
a) Electromagnetic wave transport momentum and deliver it to a body (Radiation Pressure)
b) Laser beam is highly collimated compared to the light from ordinary lamp and can be focussed to a spot.

Question 2.
It was James Clark Maxwell who modified Amperes Circuital Theorem by introducing the concept of displacement current. (March – 2010)
a) What do you mean by displacement current?
b) The SI unit of  is
a) volt
b) ampere
c) ohm
d) henry
Answer:
a) Displacement current is due to the displacement of electrons in time varying electric fields,
b) Ampere,

Question 3.
Considering the electromagnetic spectrum, name the electromagnetic wave which (Say – 2010)
a) is used to detect fracture in bones.
b) is absorbed by ozone layer of our atmosphere.
c) is produced in nuclear reactions.
d) arrange the above three waves in increase in order of wavelength.
Answer:
a) X-ray
b) UV-ray
c) Gama ray
d) Gama ray – X ray – UV ray

Question 4.
Name the electromagnetic waves used for the following applicatons. (March – 2011)
a) Imaging of bones in human body
b) Mobile phone communication
c) Remote control of T.V. sets.
d) Forsteriizing surgical instruments.
Answer:
a) X-ray
b) Radio
c) IR
d) UV-ultra violet

Question 1.
Match the following. (Say – 2011)

Answer:

Question 5.
The orderly distribution of electromagnetic radiations according to their wavelength or frequency is called the electromagnetic spectrum- Identify the constituent radiation of electromagnetic spectrum which (March – 2012)
i) is used for studying crystal structure.
ii) is absorbed by the ozone layer in the atmosphere.
iii) produces a greenhouse effect.
iv) used in medicine to destroy cancer cells.
Answer:
i) X-rays
ii) uv rays
iii) IR rays
iv) gamma rays

Question 6.
Periodic variation in electric and magnetic fields that propagates through space is called electromagnetic radiation. (Say – 2012)
a) The direction of propagation of an electromagnetic wave is that of

b) An electomagnetic wave is entering from one medium to another. Then the property which remains unaltered is
i) Wavelength
ii) Frequency
iii) Velocity
iv) None of these
Answer:
a) \(\bar{E}\) x \(\bar{B}\)
b) Frequency

Question 7.
An electromagnetic spectrum is an orderly arrangement of electromagnetic radiations in the ascending or descending order of frequency/wavelength. (March – 2013)
a) Arrange the following electromagnetic radiations in the ascending order of frequency. Visible rays, Infrared rays, X-rays, microwaves
b) Give one application of infrared and X-rays each.
Answer:
a) Microwaves → Infra red → visible → X-rays
b) Uses of infrared
i) For taking photographs during conditions of fog, smoke etc.
ii) In green houses to keep the plants warm.
iii) To treat muscular strain
iv) used in solar water heater and cookers

Uses of X-rays
i) Forthe detection of fractures
ii) Forthe investigation of structure of crystals
iii) To cure untracable skin diseases and malignant growths.?

Question 8.
An important result of Maxwell’s theory is that accelerated charges radiate electromagnetic waves. (Say – 2013)
a) Which of the following is not an electromagnetic wave?
a) X-rays
b) g-rays
c) b-rays
d) Microwaves

b) An electromagnetic wave propagates through a medium of permittivity ‘e’ and permeability ‘m’. What is the speed of this wave through the me? dium? Also, write the dimensional formula of ‘em’.
Answer:

Question 9.
Sun is a natural source of electromagnetic radiation. (Say – 2014)
a) Which part of the electromagnetic spectrum is termed as ‘heat waves’?
b) Different animals are sensitive to different ranges of electromagnetic spectrum. Human eyes are sensitive to which part of the electromagnetic spectrum.
c) Ozone layer in the atmosphere acts as a protective layer for living organisms. Which radiation is prevented by ozone layer from reaching earth.
d) Ozone layer depletion is caused by which gas.
Answer:
a) Infrared ray
b) Visible ray
c) Ultraviolet
d) CFC (Chloro Fluoro Carbon) or Freon

Question 10.
a) The electric field of a plane electromagnetic wave travelling in the +ve Z-direction is described by (March – 2015)
a) Ex = E₀ sin (kz + ωt)
b) Ex = E₀ sin (kz – ωt)
b) Ex = E₀ sin (2kz)
d) Ex = E₀ sin (kz)
b) We feel excessive sweating on a cloudy day. Why?
Answer:
a) E_n = E₀ Sin (kz – ωt)
b) On a cloudy day, the atmosphere will have more temperature de to green house effects. Hence we feel excessive sweating on a cloudy day.

Question 11.
Match the following (March – 2016)
i) X-rays – Water purifier
ii) Infrared – Cancer treatment
iii) Microwave – Remote switch
iv) Ultraviolet – Radar
Answer:
i) X-rays – Cancertreatment
ii) Infrared – Remote switch
iii) Microwave – Radar
iv) Ultraviolet – Water purifier

Question 12.
Match the following: (Say – 2016)

Answer:

Question 13.
Choose the appropriate values for X-rays from the given table. (March – 2017)

Answer:
Inm, 3 x 10¹⁷ Hz

Question 14.
An electromagnetic wave propagates with the aid of time-varying electric and magnetic fields. (Say – 2017)
a) If ϕ_E is the electric flux and ∈₀ is the permittivity dug in free space, the quantity represented by  has the unit of
i) voltage
ii) current
iii) charge
iv) magnetic field

b) In a plane electromagnetic wave, the electnc field oscillates with a frequency of 6×108 Megahertz.
In which region of the electromagnetic spectrum this wave is found?
Answer:
a) (ii)current
b) Longest wave length means shortest frequency. Hence we have to consider energy level 2 to 3.

We hope the Kerala Plus Two Chemistry Chapter Wise Questions and Answers Chapter 8 Electromagnetic Waves help you. If you have any query regarding Kerala Plus Two Chemistry Chapter Wise Questions and Answers Chapter 8 Electromagnetic Waves, drop a comment below and we will get back to you at the earliest.