Mock Test

Wave motion

by Anish
Updated On:

Wave motion

Total Questions: 44

21. Which one is not an example of electromagnetic wave ? [Jharkhand P.C.S. (PRE) 2021]

Correct Answer: (d) supersonic wave
Solution:Among the given option supersonic wave are not an example of electromagnetic waves. while γ- rays , x-rays and ultraviolet rays are example of electromagnetic wave. Supersonic wave is used for objects which travels at a speed greater than the speed of sound.

22. Which of the following has the largest wavelength ? [R.A.S/R.T.S (PRE) 1996]

Correct Answer: (d) radio wave
Solution:The electromagnet spectrum consist of all the different wavelength of electromagnet radiations such as : radio waves >micro wave>infrared wave >visible wave >ultraviolet wave >x-rays >gamma rays.Thus it is clear that the radio waves are having the maximum wavelength while the gamma rays are having minimum wavelength.

23. Which of the following electromagnetic radiation has the maximum energy ? [U.P.P.C.S.(pre) 2018, U.P.P.C.S.(MAINS) 2005]

Correct Answer: (d) x-rays
Solution:Shorter the wavelength greater the frequency and the energy in reference to energy the sequence of the energy of electromagnetic rays is as follow :
radio waves <micro wave<infrared wave <visible wave <ultraviolet wave <x-rays <gamma rays.
it is clear that among the given option the x-rays have the maximum amount of energy than the others.

24. Consider the following and arrange these in increasing order of frequency: [U.P.R.O./A.R.O.(pre) 2023]

i. X-rays
ii. Visible rays
iii. Infrared rays
iv. Radio waves
Select the correct answer using the code given below:
Code:

Correct Answer: (d) iv. iii. ii. i
Solution:The correct increasing order of the following given electromagnetic waves in terms of frequency is as follows :
radio waves <infrared waves< visible< waves x-rays.

25. Microwave are the electromagnetic waves having the frequencies in range of : [M.P.P.C.S.(PRE) 2020]

Correct Answer: (c) 1 GHz - 300 GHz.
Solution:Microwave is a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter corresponding to frequencies between 300 MHz and 300 GHz respectively.

Different sources define different frequency ranges as microwave; the above broad definition includes both UHF and EHF (millimeter wave) bands. Hence option (c) is the most appropriate answer.

26. Which one of the following is used for determining the structure of crystal : [R.A.S/R.T.S (PRE) 1997-98]

Correct Answer: (b) x-rays
Solution:Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones. Crystallographers use the properties of the inner structure of crystals to determine the arrangement of atoms and generate knowledge which is used by chemist, physicists and other. Crystallographers use X-ray, neutron, and electron diffraction techniques to identify the characteristics of solid materials.

27. A radar which detects the presence of an enemy aircraft uses : [Uttarakhand P.C.S. (mains) 2002]

Correct Answer: (b) radio waves
Solution:Radar is an object -detection system which uses radio waves to determine the range angle or velocity of objects. it is used to detect the location of aircraft ships spacecraft motor vehicle etc .

28. Remote sens uses which of the following in its applications ? [Uttarakhand P.C.S. (PRE) 2021]

Correct Answer: (d) electromagnetic wave
Solution:Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring its reflected and emitted radiation at a distance (typically from a satellite or aircraft). Remote sensing uses a part of several parts of the electromagnetic spectrum.

29. When there is a depletion of ozone in the atmosphere the wavelength of radiations striking the earth surface will be - [I.A.S. (PRE) 1993]

Correct Answer: (a) 10⁻⁷ m
Solution:Ultraviolet radiations are mainly divided into three groups:- UV-A radiations: the long wave UV-A radiations having the wavelength of 320-400 nm. They strike the surface of the Earth as the part of the rays of the sun.

UV-B radiations: the medium wave UV-B radiation has the wavelength of 280-320 nm. It is mostly absorbed by the ozone layer, but some do reach the Earth's surface.

UV-C radiations it has a wavelength of 100-280 nm. It is completely absorbed by ozone layer and atmosphere. Therefore on the depletion of ozone in the atmosphere the wavelength of radiation striking the surface of the earth will be 100 nm.

1 nm =1.0×10⁻⁹ m

1oo nm =100×10⁻⁹

= 10² × 10⁻⁹

=10⁻⁷m

30. Which one of the following type of waves are used in the night vision apparatus ? [I.A.S.(PRE) 2009]

Correct Answer: (c) infrared rays
Solution:Infrared rays are the type of electromagnetic radiations with the longer wavelength compared to those of visible light. it is used in night vision equipment, when there is insufficient visible light to see, it is used by the solders to find the target intruders and hidden bombs thus making the applications of force more discriminating.

Anish

Related Articles

CHEMISTRY (Part-V) (Railway)

Defence Technology Part-1

Space Part-4

Space Part-3

Space Part-2

Space Part-1

Leave a Comment