Wave motion

1. Which of the following is a mechanical wave ? [Uttarakhand P.C.S.(PRE) 2016]

(a) radio waves.
(b) x-rays.
(c) light waves.
(d) sound waves.

Correct Answer: (d) sound waves.

Solution:sound waves are characterized by the motion of particles in the medium and are longitudinal (in air and in any fluid medium ) mechanical waves while radio waves, x-rays and light waves are electromagnet waves.

2. An example of longitudinal wave is : [66th B.P.S.C. (PRE)(RE.EXAM) 2020]

Correct Answer: (b) sound wave.

Solution:sound waves are characterized by the motion of particles in the medium and are longitudinal (in air and in any fluid medium ) mechanical waves while radio waves, x-rays and light waves are electromagnet waves.

3. Sound wave in air is - [65th B.P.S.C. (Pre) 2019]

Correct Answer: (b) longitudinal.

Solution:Sound wave in air (and in any fluid medium ) are longitudinal waves because particles of the medium through which sound is transported vibrate parallel to the direction of propagation of sound waves.

4. What do we call the distance between two consecutive compressions of a sound wave ? [Jharkhand P.C.S. (PRE) 2023]

(a) wave number.
(b) frequency.
(c) amplitude.
(d) wavelength.

Correct Answer: (d) wavelength.

Solution:The distance between two consecutive compressions or rarefaction is the wavelength of the sound wave which is a longitudinal wave in air or any fluid medium. Wavelength in a transverse wave is the distance between two consecutive crests or toughs.

5. In a sitar which type of sound vibration are produced - [U.P.R.O/A.R.O.(pre) 2022]

(a) progressive and longitudinal.
(b) progressive and transverse.
(c) stationery and longitudinal.
(d) stationery and transverse.

Correct Answer: (d) stationery and transverse.

Solution:When we pluck the string of an instrument like the sitar the sound that we hear is not that of the sting the whole instrument is forced to vibrate and it is sound of the vibration of the instrument that we hear when a string under tension is set into vibration a transverse wave travels along the wire and is reflected at the fixed end. A transverse stationery wave is thus formed.

6. Long radio waves are reflected by which of the following layer of the earth surface - [U.P.P.C.S.(pre) 1991]

(a) troposphere.
(b) ionosphere.
(c) mesosphere.
(d) stratosphere.

Correct Answer: (b) ionosphere.

Solution:The ionosphere is a region of the earth upper atmosphere from about 50 to 400 miles altitude.It is ionized by the solar radiation it has the practical importance because among the other function it influences radio propagation to distant places on earth.

7. Wireless communication is reflected back to the earth's surface by the - [U.P.P.C.S.(pre) 1998]

(a) stratosphere
(b) ionosphere
(c) exosphere
(d) troposphere

Correct Answer: (b) ionosphere

Solution:The ionosphere is a region of the earth upper atmosphere from about 50 to 400 miles altitude.It is ionized by the solar radiation it has the practical importance because among the other function it influences radio propagation to distant places on earth.

8. Which of the following atmospheric layer is responsible for the deflection of radiowaves ? [U.P. Lower Sub (pre) 1998]

(a) ionosphere.
(b) stratosphere.
(c) troposphere.
(d) exosphere.

Correct Answer: (a) ionosphere.

Solution:The ionosphere is a region of the earth upper atmosphere from about 50 to 400 miles altitude.It is ionized by the solar radiation it has the practical importance because among the other function it influences radio propagation to distant places on earth.

9. Waves of the ultra high frequency (UHF) range normally propagate by means of [R.A.S/R.T.S (PRE) 2018]

(a) ground wave.
(b) sky wave.
(c) space wave.
(d) surface wave.

Correct Answer: (c) space wave.

Solution:Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 MHz and 3 GHz. Owing to its high frequency, an ultra-high frequency (UHF) wave can neither travel along the trajectory of the ground nor get reflected by the ionosphere. The signals having UHF are propagated normally through the line of sight communication which is actually space wave propagation. The radio waves having high frequencies are basically called as space waves.

10. Which of the following cannot travel in vacuum ? [M.P.P.C.S.(PRE) 2000, Uttarakhand P.C.S. (PRE) 2023]

(a) light.
(b) heat.
(c) sound.
(d) electromagnetic waves.

Correct Answer: (c) sound.

Solution:Sound waves cannot travel in vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel. It can be transmitted through solid, liquid, and gas.

Wave motion

Wave motion

1. Which of the following is a mechanical wave ? [Uttarakhand P.C.S.(PRE) 2016]

2. An example of longitudinal wave is : [66th B.P.S.C. (PRE)(RE.EXAM) 2020]

3. Sound wave in air is - [65th B.P.S.C. (Pre) 2019]

4. What do we call the distance between two consecutive compressions of a sound wave ? [Jharkhand P.C.S. (PRE) 2023]

5. In a sitar which type of sound vibration are produced - [U.P.R.O/A.R.O.(pre) 2022]

6. Long radio waves are reflected by which of the following layer of the earth surface - [U.P.P.C.S.(pre) 1991]

7. Wireless communication is reflected back to the earth's surface by the - [U.P.P.C.S.(pre) 1998]

8. Which of the following atmospheric layer is responsible for the deflection of radiowaves ? [U.P. Lower Sub (pre) 1998]

9. Waves of the ultra high frequency (UHF) range normally propagate by means of [R.A.S/R.T.S (PRE) 2018]

10. Which of the following cannot travel in vacuum ? [M.P.P.C.S.(PRE) 2000, Uttarakhand P.C.S. (PRE) 2023]

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