This is the Multiples Choice Questions Part 8 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.
Online Questions and Answers in Physics Series
Following is the list of multiple choice questions in this brand new series:
Continue Practice Exam Test Questions Part VIII of the Series
Choose the letter of the best answer in each questions.
351. “At any point along a streamline in an ideal fluid in steady flow, the sum of the pressure, the potential energy per unit volume and the kinetic energy per unit volume have the same value.” The concept is known as
- A. Bernoulli’s Energy Principles
- B. Fluid theorem
- C. Pascal’s theorem
- D. Hydraulic theorem
352. The work done by all forces except the gravitational force is always equal to the one of the system.
- A. Total mechanical energy
- B. Total potential energy
- C. Total kinetic energy
- D. Total momentum
353. When the two waves of the same frequency, speed and amplitude traveling in opposite directions are superimposed,
- A. the phase difference is always zero
- B. distractive waves are produced
- C. standing waves are produced
- D. constructive interference always results to zero
354. According to this law, “The force between two charges varies directly as the magnitude of each charge and inversely as the square of the distance between them.”
- A. Law of Universal Gravitation
- B. Newton’s Law
- C. Inverse Square Law
- D. Coulomb’s Law
355. It describes the luminous flux incidence per unit area and is expressed in lumens per square meter.
- A. Illuminance
- B. Luminance
- C. Luminous Intensity
- D. Radiance
356. The fluid pressure is the same in all directions. This is known as
- A. Pascal’s Principle
- B. Bernoulli’s Theorem
- C. Ideal Fluid Principle
- D. Archimedes Principle
357. The amount of heat needed to change solid to liquid is
- A. condensation
- B. cold fusion
- C. latent heat of fusion
- D. solid fusion
358. At the boiling point of liquid, the vapor pressure
- A. is equal to external pressure on the surface of the liquid
- B. is greater than the atmospheric pressure
- C. is less than the atmospheric pressure
- D. can have any value
359. Which of the following thermometers is best suited for measuring a temperature of nearly 1500oC?
- A. Gas thermometer
- B. Platinum resistance thermometer
- C. Thermo couple thermometer
- D. Mercury thermometer
360. The energy stored in a starched elastic material such as spring is
- A. Mechanical energy
- B. Elastic potential energy
- C. Internal energy
- D. Kinetic energy
361. In physics, if LF and LV are the latent heat of fusion and vaporization, respectively, which of the following equations apply in determining the amount of energy needed to freeze a liquid?
- A. Q = -mif
- B. Q = -miv
- C. Q = mif
- D. Q = miv
362. Which of the following is true? The density of water
- A. Is maximum at 4oC
- B. Decreases as the temperature is increased
- C. Is minimum at 4oC
- D. Increases with temperature
363. When the pitch of a note is raised then, its
- A. frequency decreases
- B. wavelength is increased
- C. frequency increases
- D. None of the above is true
364. Cohesion is the attraction between like
- A. atom
- B. element
- C. compound
- D. molecule
365. The quality known as specific heat is based on:
- A. the increase in temperature due to induction
- B. the heat needed for one pound of water to boil
- C. the heat needed to increase the temperature to one gram of a substance one degree Celsius
- D. the amount of heat required to melt one kg of lead
366. On decreasing the pressure, the boiling point of water will
- A. increase
- B. remain unaffected
- C. decrease
- D. may increase/decrease depending on the pressure
367. When sugar is added to water, its boiling point
- A. increases
- B. remains unaffected
- C. decreases
- D. Any of the above is possible
368. Which one of the following processes of heat transfer requires the presence of a fluid?
- A. conduction
- B. convection
- C. radiation
- D. none of the above
369. When salt is added to water, its boiling point
- A. increases
- B. decreases
- C. remains unaffected
- D. may increase/decrease depending on the pressure
370. Which one of the following propagates with the same speed as speed of light?
- A. The sound waves
- B. The heat waves
- C. The shock waves
- D. The Beta rays
371. Which of the following is not true about sound waves?
- A. They transmit the energy
- B. They are propagated as a series of compressions and the rare fractions
- C. They travel faster in air than in solids
- D. They produce interference
372. Sound waves in air are
- A. longitudinal
- B. neither longitudinal nor transverse
- C. transverse
- D. stationary
373. Normal range of the frequency of sound, which the human beings can hear, is
- A. Less than 20 Hz
- B. More than 25,000 Hz
- C. 20 Hz to 20,000 Hz
- D. All of these
374. The loudness of sound depends upon its
- A. Wavelength
- B. Frequency
- C. Amplitude
- D. All of the above
375. Sound above the frequency of 20,000 Hz is called
- A. Supersonic sound
- B. Intrasonic sound
- C. Hypersonic sound
- D. Ultrasonic sound
376. The surface of the thermos flask is silvered for minimizing heat transfer by what process?
- A. conduction
- B. radiation
- C. convection
- D. vaporization
377. Water starts boiling when
- A. Its temperature reaches 100oC
- B. Its vapor pressure equals 76cm of mercury
- C. Its saturated vapor pressure equals the external pressure on its surface
- D. Its saturated vapor pressure is less than the atmospheric pressure
378. 500 gm of water at 4oC occupies a certain volume V. Which of the following statements is correct?
- A. It will weigh less than one pound of water at 0oC
- B. It will weigh more than 500 gm of water at 0oC
- C. Its volume will decrease when its temperature is lowered
- D. Its volume will increase when its temperature is lowered or raised
379. Heat will flow from one body to another in thermal contact with it, when they differ in
- A. mass
- B. specific mass
- C. density
- D. temperature
380. The amount of heat which is absorbed during the change of state of a substance without rise in its temperature is called its
- A. Specific heat
- B. Latent heat
- C. Thermal conductivity
- D. Water equivalent
381. The scientist who systematically demonstrated the equivalence of mechanical energy and heat was
- A. Joule
- B. Boltzmann
- C. Faraday
- D. Kelvin
382. On a sunny day at the beach, the sand gets so hot and the water stays relatively cool is due to the difference in of water and sand.
- A. density
- B. specific heat
- C. depth
- D. thermal conductivity
383. The instrument, which measures temperature by radiation, is called
- A. thermopile
- B. thermometer
- C. pyrometer
- D. hydrometer
384. When the temperature of an ideal gas is increased at constant pressure,
- A. the potential energy of molecules increases
- B. the potential energy of molecules decreases
- C. the kinetic energy of molecules increases
- D. the kinetic energy of molecules decreases
385. The root mean square speed of the molecules of a gas is
- A. independent of its pressure P
- B. directly proportional to square root of P
- C. directly proportional to the square of its temperature T
- D. proportional to T
386. At what temperature do both the centigrade and Fahrenheit thermometers show the same reading?
- A. -38oC
- B. -40oC
- C. -42oC
- D. -50oC
387. A mercury thermometer is constructed at
- A. room temperature
- B. a temperature higher than the maximum range of the thermometer
- C. a temperature lower than the minimum range of the thermometer
- D. atmospheric pressure
388. The boiling point of water on plains is 100oC. At hills it will be
- A. 100oC
- B. Less than 100oC
- C. More than 100oC
- D. May be any of the above
389. It is hotter over the top of a fire than at the same distance on the sides because of:
- A. convection of heat
- B. conduction of heat
- C. radiation of heat
- D. convection, conduction and radiation of heat
390. The density of water is
- A. same at all temperature
- B. maximum at 4oC
- C. minimum at 4oC
- D. maximum at 0oC
391. When a substance is heated, its
- A. molecules move more slowly
- B. molecules move more rapidly
- C. there is no change in the speed of its molecules
- D. its temperature always increases
392. When common salt is sprinkled on ice the temperature of ice
- A. increases
- B. decreases
- C. remains unchanged
- D. none of these
393. The minimum temperature which can be measured with a mercury thermometer is
- A. 0oC
- B. -273oC
- C. -39oC
- D. -143oC
394. A wave in which the particles of the material move up and down as the waves goes from left is called a
- A. Longitudinal wave
- B. Transverse wave
- C. Standing wave
- D. None of these
395. When waves go from one place to another they transport
- A. Energy and matter
- B. Wavelength and matter
- C. Frequency only
- D. Energy only
396. The phenomenon of damping results in decrease in
- A. frequency
- B. velocity
- C. wavelength
- D. amplitude
397. Echo is formed as a result of
- A. refraction of sound
- B. diffraction of sound
- C. interference of sound
- D. reflection of sound
398. The characteristic of sound which enables us to distinguish two musical notes having the same frequency and loudness is called
- A. pitch
- B. intensity
- C. timber
- D. decibel
399. Which of the following could be a longitudinal wave?
- A. electromagnetic waves
- B. a sound wave in air
- C. a water wave
- D. waves on vibrating string
400. A Decibel is a
- A. musical instrument
- B. highest frequency emitted by a tuning fork
- C. a measure of intensity level
- D. a measure of clarity of sound
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