Wave Motion – Old Year Questions

1. Which of the following is a mechanical wave?

(a) Radio-waves
(b) X-rays
(c) Light waves
(d) Sound waves

[Uttarakhand P.C.S. (Pre) 2016]


2. An example of a longitudinal wave is :

(a) Radio wave
(b) Sound wave
(c) X-ray
(d) Gamma ray
(e) None of the above/More than one of the above

[66th B.P.S.C. (Pre) (Re. Exam) 2020]


3. Sound wave in air is –

(a) transverse
(b) longitudinal
(c) electromagnetic
(d) polarized
(e) None of the above/More than one of the above

[65th B.P.S.C. (Pre) 2019]


4. In a Sitar, which type of sound vibrations are produced?

(a) Progressive and Longitudinal
(b) Progressive and Transverse
(c) Stationary and Longitudinal
(d) Stationary and Transverse

[U.P. R.O./A.R.O. (Pre) 2021]


5. Long radio waves are reflected by which of the following layer of earth’s surface –

(a) Troposphere
(b) Ionosphere
(c) Tropopause
(d) Stratosphere

[U.P. P.C.S. (Pre) 1991]


6. Wireless communication is reflected back to the earth’s surface by the –

(a) Troposphere
(b) Stratosphere
(c) Ionosphere
(d) Exosphere

[U.P.P.C.S. (Pre) 1998]


7. Which of the following atmospheric layers is responsible for the defection of radio waves?

(a) Troposphere
(b) Stratosphere
(c) Mesosphere
(d) Ionosphere

[U.P. Lower Sub. (Pre) 1998]


8. Waves of the Ultra High Frequency (UHF) range normally propagate by means of

(a) Ground waves
(b) Sky waves
(c) Space waves
(d) Surface waves

[R.A.S. / R.T.S. (Pre) 2018]


9. Which waves cannot be transmitted through a vacuum?

(a) Light
(b) Heat
(c) Sound
(d) Electromagnetic

[M.P.P.C.S. (Pre) 2000]


10. Assertion (A): Radio waves bend in a magnetic field.
Reason (R): Radio waves are electromagnetic in nature.

Code :

(a) Both (A) and (R) are true, and (R) is the correct explanation of (A)
(b) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
(c) (A) is true, but (R) is false
(d) (A) is false, but (R) is true

[I.A.S. (Pre) 2008]


11. Cosmic rays –

(a) Are charged particles
(b) Are uncharged particles
(c) Can be charged as well as uncharged
(d) None of the above

[56th to 59th B.P.S.C. (Pre) 2015]


12. Which one of the following statements is not true about cosmic rays?

(a) They are electromagnetic waves
(b) They have very short wavelengths
(c) They are made of highly energetic charged particles
(d) They originate from the Sun

[U.P.P.C.S. (Pre) 2005]


13. Which of the following does not require a medium?

(a) Radiation
(b) Convection
(c) Conduction
(d) None of these

[U.P. R.O./A.R.O. (Mains) 2017]


14. Which one of the following is associated with ‘Albedo’?

(a) Transmitting power
(b) Absorbing power
(c) Emissive power
(d) Reflecting power

[U.P.P.C.S. (Pre) 2019]


15. What is the distance between two successive crests or successive troughs called?

(a) Amplitude
(b) Wavelength
(c) Frequency
(d) None of these

[45th B.P.S.C. (Pre) 2002]


16. The velocity of electromagnetic waves is :

(a) 3 × 108ms–1
(b) 3 × 107ms–1
(c) 3 × 106ms–1
(d) 3 × 105ms–1
(e) None of the above/More than one of the above

[66th B.P.S.C. (Pre) 2020]


17. Which one is not an example of an electromagnetic wave?

(a) γ-rays
(b) X-rays
(c) Ultraviolet rays
(d) Supersonic waves

[Jharkhand P.C.S. (Pre) 2021]


18. Which of the following has the longest wavelength?

(a) Infrared
(b) X-rays
(c) Visible light
(d) Radio waves

[R.A.S./R.T.S. (Pre) 1996]


19. Which of the following electromagnetic radiations has the maximum energy?

(a) Visible light
(b) Infrared rays
(c) Ultraviolet rays
(d) X-rays

[U.P. P.C.S. (Pre) 2018, U.P. P.C.S. (Mains) 2005]


20. Microwaves are electromagnetic waves having frequencies in the range of :

(a) 300 KHz – 3 MHz
(b) 3 MHz – 300 MHz
(c) 1 GHz – 300 GHz
(d) 300 GHz – 400 THz

[M.P. P.C.S. (Pre) 2020]


21. Which one of the following is used for determining the structure of a crystal :

(a) Gamma rays
(b) X-rays
(c) UV rays
(d) visible lights

[R.A.S./R.T.S. (Pre) 1997-98]


22. A radar which detects the presence of an enemy aircraft uses :

(a) Light waves
(b) Radio waves
(c) Sound waves
(d) Ultrasound waves

[Uttarakhand P.C.S. (Mains) 2002]


23. When there is a depletion of ozone in the stratosphere, the wavelength of radiation striking the earth’s surface will be –

(a) 10–10 m
(b) 10–7 m
(c) 10–2 m
(d) 100 m

[I.A.S. (Pre) 1993]


24. Which one of the following types of waves are used in a Night Vision apparatus?

(a) Radio waves
(b) Microwaves
(c) Infrared waves
(d) None of these

[I.A.S. (Pre) 2009]


25. The waves used in common TV remote control are

(a) X-Rays
(b) Ultraviolet Rays
(c) Infrared Rays
(d) Gamma Rays

[R.A.S./R.T.S. (Pre) 2018]


26. Which type of electromagnetic radiation is used in the remote control of a television?

(a) Infrared
(b) Ultraviolet
(c) Visible
(d) None of the above

[U.P.P.C.S.(Pre) 2013, U.P. U.D.A./L.D.A. (Pre) 2010, U.P.P.C.S (Pre) 2010, U.P.P.C.S. (Pre) 2002]


27. Which electromagnetic radiation is used in the remote control of a television?

(a) Infrared
(b) Ultraviolet
(c) Microwave
(d) None of the above

[Jharkhand P.C.S. (Pre) 2013]


28. Which one of the following does a TV remote control unit use to operate a TV set?

(a) Light waves
(b) Sound saves
(c) Microwaves
(d) Radio waves

[U.P.P.C.S. (Mains) 2013, I.A.S. (Pre) 2000]


29. Waves used for telecommunication are –

(a) Visible light
(b) Infrared
(c) Ultraviolet
(d) Microwave

[U.P.P.C.S. (Mains) 2013]


30. FM broadcasting service uses the range of frequency bands between –

(a) 109-139 MHz
(b) 54-75 MHz
(c) 76-87 MHz
(d) 88-108 MHz

[R.A.S/R.T.S. (Pre) 2013]


31. A radio station broadcast at 30-metre band. The frequency of the carrier wave transmitted by this station is:-

(a) 10 KHz
(b) 100 KHz
(c) 10 MHz
(d) 100 MHz

[R.A.S./R.T.S. (Pre) 1993]


32. A layer in the Earth’s atmosphere called the Ionosphere facilitates radio communication. Why?

1. The presence of ozone causes the reflection of radio waves on Earth.
2. Radio waves have a very long wavelength.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

[I.A.S. (Pre) 2011]


33. Television viewers using dish antennas to receive satellite signals do not receive signals during rain because :

1. of the small size of the antenna.
2. rain droplets absorb the energy of radio waves.
3. rain droplets disperse the energy of radio waves from their original direction.

Which of the above statements is correct?

(a) only 1
(b) only 1 and 2
(c) only 2 and 3
(d) 1, 2, and 3

[U.P.P.C.S. (Pre) 2017]


34. The following rays are used in the diagnosis of intestinal diseases :

(a) X-rays
(b) α-rays
(c) β-rays
(d) γ-rays

[43rd B.P.S.C. (Pre) 1999]


35. CT Scan is done by using –

(a) Infrared Rays
(b) Ultrasonic Waves
(c) Visible Light
(d) X-Rays

[U.P.P.C.S. (Mains) 2011]


36. Which of the following was invented by Wilhelm Röntgen?

(a) Radio
(b) X-Ray Machine
(c) Electric Bulb
(d) None of the above

[U.P. P.C.S. (Pre) 2018]