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# MCQ in Physics Part 5 | ECE Board Exam

This is the Multiples Choice Questions Part 5 of the Series in Physics as one of the General Engineering and Applied Sciences (GEAS) topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS), Physics Books, Journals and other Physics References.

#### Continue Practice Exam Test Questions Part 5 of the Series

Choose the letter of the best answer in each questions.

201. If the forces acting on a falling body balance one another, the body continues to fall at a constant velocity. What is thus constant velocity called?

A. Instantaneous velocity

B. Free-falling body

C. Gravitational velocity

D. Terminal velocity

Explanation:

202. The first law of motion is also known as ___________.

A. Law of acceleration

B. Law of inertia

C. Law of interaction

D. Law of momentum

Explanation:

203. The second law of motion is also known as _________.

A. Law of acceleration

B. Law of inertia

C. Law of interaction

D. Law of momentum

Explanation:

204. The third law of motion is also known as __________.

A. Law of acceleration

B. Law of inertia

C. Law of interaction

D. Law of momentum

Explanation:

205. Air exerts force that is opposite to the carโs motion. What is this force called?

A. Reverse effective force

B. Terminal force

C. Drag force

D. Aerodynamic force

Explanation:

206. What instrument is used to measure blood pressure of human beings?

A. Stropomanometer

B. Pumpmanometer

C. Electromanometer

D. Sphygmomanometer

Explanation:

207. What do light, radiowaves, microwaves and X-rays have in common?

A. These waves were predicted by only one person, James Maxwell.

B. These do not need a medium to travel in.

C. These waves are all mechanical waves.

D. These waves are all serendipitous discoveries.

Explanation:

208. Who predicted the existence of electromagnetic waves in 1865?

A. Roentgen

B. Maxwell

C. Tesla

D. Doppler

Explanation:

209. What is the velocity of light in meters per second?

A. 3 x 10^6

B. 3 x 10^9

C. 3 x 10^7

D. 3 x 10^8

Explanation:

210. What is the sound level of the threshold of pain?

A. 100 dB

B. 110 dB

C. 120 dB

D. 130 dB

Explanation:

211. What is the intensity in W/m2 of the threshold of pain?

A. 1

B. 10

C. 0.1

D. 0.01

Explanation:

212. What is the intensity of the threshold of hearing in W/m2?

A. 10^-12

B. 10^-10

C. 10^-8

D. 10^-6

Explanation:

213. What refers to a measure of the energy of sound?

A. Intensity

B. Loudness

C. Pitch

D. Sone

Explanation:

214. What refers to the sensation in the ear which depends on the energy in the sound wave?

A. Pitch

B. Intensity

C. Loudness

D. Timbre

Explanation:

215. How can loudness of sound be increased?

A. By increasing the energy of sound

B. By preventing sound waves to spread in different directions.

C. By collecting and focusing sound waves at the receiving end.

D. All of the choices.

Explanation:

216. Which of the following is dependent upon the frequency of sound vibrations?

A. Timbre

B. Loudness

C. Intensity

D. Pitch

Explanation:

217. The โDoppler effectโ is named after which scientist?

A. Christopher Jacques Doppler

B. Christian Jacques Doppler

C. Christopher Jason Doppler

D. Christian Johann Doppler

Explanation:

218. When a person tells you that the pitch of your voice is high, he is referring to _________.

A. the intensity of your voice

B. the number of sound waves you are sending out per second

C. the loudness of your voice

D. the equality of your voice

Explanation:

219. At what intensity level will a noise be considered pollutant in the environment?

A. Above 50 dB

B. Above 100 dB

C. Above 120 dB

D. Above 150 dB

Explanation:

220. The velocity of sound in air increases by how many m/s for every 1ยบC increase in temperature?

A. 0.2

B. 0.4

C. 0.6

D. 0.8

Explanation:

221. Why is sound wave travel faster in water than in air?

A. Because water has greater density than air.

B. Because water has greater bulk modulus than air.

C. Because water has more in terms of number of molecules than air.

D. Because water has more in volume than air.

Explanation:

222. What will happen to the wavelength if the velocity and frequency of a wave are both reduced to one-half?

A. It will double.

B. It will reduce in half.

D. It will remain the same.

Explanation:

223. Which of the following statements is TRUE?

A. A high-frequency sound has high pitch.

B. A high-frequency sound has low pitch.

C. A high-frequency sound has low energy.

D. A high-frequency sound has low pitch and low energy.

Explanation:

224. What part of the human ear where sound energy is converted into electrical energy?

A. Ear drum

B. Cochlea

C. Tympanum

D. Ear canal

Explanation:

225. In which medium do sound waves travel the faster?

A. Liquids

B. Solids

C. Gases

D. Vacuum

Explanation:

226. Who provide evidence that light and electromagnetic waves have the same nature and that they travel at the same speed and exhibit the same properties such as refraction, reflection and interference?

A. Townes

B. Maxwell

C. Hertz

D. Huygens

Explanation:

227. Which of the following has the smallest wavelength band?

A. Blue

B. Indigo

C. Green

D. Yellow

Explanation:

228. What color has the longest wavelength?

A. Orange

B. Red

C. Yellow

D. Green

Explanation:

229. What color has the shortest wavelength?

A. Indigo

B. Violet

C. Blue

D. Green

Explanation:

230. What is the wavelength band of orange?

A. 550 nm โ 600 nm

B. 600 nm โ 650 nm

C. 650 nm โ 700 nm

D. 500 nm โ 550 nm

Explanation:

231. What is the wavelength band in nanometer of visible light?

A. 350 โ 700

B. 350 โ 800

C. 300 โ 700

D. 300 โ 800

Explanation:

232. What terms is used to describe the angular opening of a sphere that encloses the mirror?

A. Angle of curvature

B. Focal point

C. Aperture

D. Vertex

Explanation:

233. What makes the sun visible even before it is in the line with the horizon?

A. Diffraction

B. Reflection

C. Refraction

D. Diffusion

Explanation:

234. When the white light is passed through a prism, the different lights are bent to varying degrees and are dispersed into different colors. Which of these colors bends the most?

A. Violet

B. Red

C. Orange

D. Green

Explanation:

235. When the white light is passed through a prism, the different lights are bent to varying degrees and are dispersed into different colors. Which of these colors bends the least?

A. Violet

B. Red

C. Orange

D. Green

Explanation:

236. The formation of rainbow in the sky is due to _______.

A. diffraction

B. reflection

C. refraction

D. diffusion

Explanation:

237. What refers to the defect in lenses which causes unequal refraction of the different colors?

A. Chromatic diffraction

B. Chromatic polarization

C. Chromatic aberration

D. Chromatic dispersion

Explanation:

238. What property of a light wave is determined by its wavelength?

A. Color

B. Shape

C. Size

D. Density

Explanation:

239. What is diffraction?

A. It is the scattering of white light behind an obstruction.

B. It is the separation of white light into its component colors.

C. It is the merging of component colors into white light.

D. It is the absorption of white light in the atmosphere.

Explanation:

240. What is dispersion?

A. It is the scattering of white light behind an obstruction.

B. It is the separation of white light into its component colors.

C. It is the merging of component colors into white light.

D. It is the absorption of white light in the atmosphere

Explanation:

241. What are primary colors?

A. Blue, Red and White

B. Light colors

C. Colors which when combined produce white light

D. Blue, Red and Green

Explanation:

242. What device used to measure atmospheric pressure and is consists of a glass tube sealed at one end filled with mercury and a slide with a Vernier scale?

A. Bourdon gage

B. Aneroid barometer

C. Mercury barometer

D. Manometer

Explanation:

243. A wave that needs a material medium through which it can travel as it transfers energy?

A. Electromagnetic wave

C. Microwave

D. Mechanical wave

Explanation:

244. What refers to the band of colors produced when sunlight passes through a prism?

A. Light spectrum

B. Solar spectrum

C. White spectrum

D. Visible spectrum

Explanation:

245. What refers to the property of some media to transmit light wave in a diffused matter to make objects behind them undistinguishable?

A. Lucidity

B. Limpidity

C. Transparent

D. Translucent

Explanation:

246. What refers to the invisible electromagnetic waves shorter than the visible violet wave but longer than the Roentgen ray?

A. Beta ray

B. Ultraviolet light

C. Alpha ray

D. X-ray

Explanation:

247. What refers to the part of the shadow from which all light is excluded?

A. Footprint

B. Lumbra

C. Umbra

D. Sunspot

Explanation:

248. The range of the projectile is:

A. directly proportional to the gravitational acceleration

B. directly proportional to the square of the velocity

C. directly proportional to the velocity

D. inversely proportional to the velocity

Explanation:

249. What instrument is used to measure humidity of air?

A. Hydrometer

B. Hygrometer

C. Lactometer

Explanation:

250. It explains combustion as a result of loss of a substance.

a. Phlogiston

b. Roasting

c. Reduction

d. Fission

Explanation:

#### Online Questions and Answers in Physics Series

Following is the list of practice exam test questions in this brand new series:

College Physics MCQs
PART 1: MCQ from Number 1 โ 50                        Answer key: PART 1
PART 2: MCQ from Number 51 โ 100                   Answer key: PART 2
PART 3: MCQ from Number 101 โ 150                 Answer key: PART 3
PART 4: MCQ from Number 151 โ 200                 Answer key: PART 4
PART 5: MCQ from Number 201 โ 250                 Answer key: PART 5
PART 6: MCQ from Number 251 โ 300                 Answer key: PART 6
PART 7: MCQ from Number 301 โ 350                 Answer key: PART 7
PART 8: MCQ from Number 351 โ 400                 Answer key: PART 8
PART 9: MCQ from Number 401 โ 450                 Answer key: PART 9
PART 10: MCQ from Number 451 โ 500                 Answer key: PART 10

Complete List of MCQs in General Engineering and Applied Science per topic

Series of MCQ in General Engineering and Applied Science

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