MCQ in Physics Part 15 | ECE Board Exam

(Last Updated On: February 22, 2020)

MCQs in Physics Part 15

This is the Multiples Choice Questions Part 15 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:

College Physics MCQs
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI
PART 7: MCQs from Number 301 – 350                 Answer key: PART VII
PART 8: MCQs from Number 351 – 400                 Answer key: PART VIII
PART 9: MCQs from Number 401 – 450                 Answer key: PART IX
PART 15: MCQs from Number 701 – 750                 Answer key: PART XV

Continue Practice Exam Test Questions Part XV of the Series

Choose the letter of the best answer in each questions.

701. What is the velocity of a wave along a cord having a linear mass of 4 g/cm if the cord is stretched to have a tension of 90 Kdyne?

  • a) 3600 m/s
  • b) 6300 m/s
  • c) 6030 m/s
  • d) 1460 m/s

702. What is the wavelength in air under standard conditions of a compressional wave whose frequency is 250 per second? Assume that the bulk modulus for air is 1.40 Mdyne/cm2 and the density of air is 1.29 g/L.

  • a) 132 cm
  • b) 231 cm
  • c) 123 cm
  • d) 321 cm

703. What tension would be required to create a standing wave with four segments in a string 100 cm long weighing 0.50 g. If it is attached to a vibrator with a frequency of 100 Hz?

  • a) 0.125 Mdyne
  • b) 0.521 Mdyne
  • c) 0.152 dyne
  • d) 0.251 dyne

704. What is the velocity of a wave along a chord having a linear mass of 4 g/cm if the chord is stretched to have a tension of 90 Kdyne?

  • a) 105 cm/s
  • b) 150 cm/s
  • c) 501 cm/s
  • d) 510 cm/s

705. What is the theoretical speed of sound in oxygen at 0°C for a diatomic gas u = 1.40, and for oxygen M = 32.00 g/mol.

  • a) 315 m/s
  • b) 215 m/s
  • c) 500 m/s
  • d) 351 m/s

706. A sonar device on a submarine sends out a signal and receives an echo 5 seconds later. Assuming the speed of sound in water to be 1452 m/s, how far away is the object that is reflecting the signal?

  • a) 3526m
  • b) 4215m
  • c) 3625 m
  • d) 3512m

707. What note is sounded by a siren having a disk with 16 holes and making 20 r/s?

  • a) 320 Hz
  • b) 220 Hz
  • c) 302 Hz
  • d) 230 Hz

708. If one sound is 5.0 dB higher than another, what is the ratio of their intensities?

  • a) 3.16
  • b) 31.6
  • c) 2.55
  • d) 35.1

709. Two sounds have intensities of 0.5 and 10 W/m² respectively. How many decibels is one louder than the other?

  • a) 1.3 dB
  • b) 13 dB
  • c) 3.1 dB
  • d) 31 dB

710. Two sound waves have intensities of 100 and 400 ∝W/cm2, respectively. How much louder is one than the other?

  • a) 0.6 dB
  • b) 6 dB
  • c) 4 dB
  • d) 7 dB

711. If an unshaded electric lamp is 6m above a table and is lowered to 3m, how much has its luminance been increase?

  • a) 1
  • b) 2
  • c) 3
  • d) 4

712. A lamp produces a certain luminance on a screen situated 85 cm from it. On placing a glass plate between the lamp and the screen, the lamp must be moved 5 cm closer to the screen to produced same illuminance as before. What percent of the light is stopped by the glass?

  • a) 11%
  • b) 12%
  • c) 13 %
  • d) 14%

713. If a lamp provides an illuminance of 8.0 mc on a book is moved 1.5 times as far away , will the new illumination then be sufficient for comfortable reading?

  • a) 2.5 mc
  • b) 3.6 mc
  • c) 3 mc
  • d) 4 mc

714. If the light of a full moon is found to produce the same illuminance as a 1.0 cd source does at a distance of 4.0 ft., what is the effective luminous intensity of the moon? (The mean distance of the moon is 239,000 mi.)

  • a) 1.0 x 10 cd
  • b) 2.0 x 10 cd
  • c) 3.0 x 10 cd
  • d) 4.0 x 10 cd

715. An unknown lamped placed 6m from a photometer screen provides the same illumination as an 80 cd lamp placed 4 m from that same screen. What is the candle power of the unknown lamp?

  • a) 180 cd
  • b) 200 cd
  • c) 280 cd
  • d) 100 cd

716. A standard 48 – cd lamp is placed 30cm from a photometer screen and produces the same illumination as a 60 -cd lamped placed some distance away. How far away is the 60 -cd lamp from the screen?

  • a) 33.54 cm
  • b) 23.54 cm
  • c) 33.43 cm
  • d) 25.43 cm

717. Two point sources of light are placed 4.0m apart on a photometer. If one is a standard of 50 cd and they produced equal illuminance at a point 2.5m from the standard source, what is the intensity of the second source?

  • a) 18 cd
  • b) 19 cd
  • c) 20 cd
  • d) 17 cd

718. A point source of light of 10 cd is enclosed at the middle of a hollow sphere having a radius of 4 m. If an opening of 10 m2 exist in the sphere, what is the luminous flux through the opening?

  • a) 625 m
  • b) 62.5 m
  • c) 6.25 m
  • d) 0.625 m

719. Find the candle power of a point source of light that provides 20 mc of illumination on a surface 4 m away.

  • a) 320 cd
  • b) 32.0 cd
  • c) 3.20 cd
  • d) 217 cd

720. What is the vertical length of the smallest plane mirror in which a man 2 m tall can just see his full height from the top of his head to his feet?

  • a) 1 m
  • b) 2 m
  • c) 3 m
  • d) 4m

721. A person backing a car up sees in the rearview mirror a person walking toward him at 5 km/hr. If the car is moving backward at 10km/hr., how fast does the person as viewed from the mirror approached the car.

  • a) 10 km/h
  • b) 20 km /h
  • c) 50 km/h
  • d) 30 km/h

722. The distance of comfortable distinct vision is about 25 cm for the average person. Where should a person hold a plane mirror in order to see himself conveniently?

  • a) 12.5 cm
  • b) 125 cm
  • c) 20 cm
  • d) 10cm

723. An object is placed 20 cm in front of a concave mirror of radius 60 cm. Where is the image?

  • a) 12cm
  • b) 25cm
  • c) 60 cm
  • d) 100 cm

724. In what position in front of a spherical mirror should an object be placed to produce a real image which is magnified three times if the radius of curvature of the mirror is 18cm?

  • a) 12 cm
  • b) 9 cm
  • c) 7 cm
  • d) 10cm

725. A dentist holds a concave mirror of radius of curvature 6.0 cm at a distance 2.0 cm from a filling in a tooth. What is the magnification of the filling?

  • a) 2
  • b) 4
  • c) 5
  • d) 3

726. A convex mirror whose focal length is 15 cm has an object of 10 cm tall and 60 cm away. Find the position, nature, and size of the object.

For position:

  • a) -12 cm
  • b) -9 cm
  • c) -7cm
  • d) -10 cm

727. For nature:

  • a) real
  • b) virtual
  • c) cannot be determined
  • d) none of these

728. For size:

  • a) 2 cm
  • b) 3 cm
  • c) 4 cm
  • d) 1 cm

729. In what position should an object be placed in front of a concave mirror having a focal length of 20 cm so that an erect image which is twice as large as the object is formed?

  • a) 12 cm
  • b) 9 cm
  • c) 7 cm
  • d) 10 cm

730. The angle of incidence of a ray of light at the surface of water is 40°and the observe angle of refraction is 29°. Compute the index of refraction.

  • a) 13.25
  • b) 1.325
  • c) 1.25
  • d) 132.5 cm

731. The velocity of light in a liquid is 0.80 as fast as it is in air. What is the index of refraction of the liquid?

  • a) 13.25
  • b) 1.325
  • c) 1.25
  • d) 132.5

732. A ray of light strikes a water surface at an angle. The angle of refraction in the water is measured to be 22°. What must be the angle of incidence of the light ray have been?

  • a) 30°
  • b) 25°
  • c) 35°
  • d) 40°

733. What is the mass of a box which requires 3518 J of work to be pulled 9.36 m across a floor with a coefficient of kinetic friction between the box and the floor of 0.4?

  • a. 96 kg
  • b. 95.8 kg
  • c. 95.7 kg
  • d. 95.9 kg

734. How far must you pull a 10.9 kg box across the floor to do 123.3 J of work if the coefficient of kinetic friction between the box and the floor is 0.15?

  • a. 7.5 m
  • b. 7.6 m
  • c. 7.7 m
  • d. 7.8 m

735. How much work must be done to move a 3.8 kg chair 6.1 m across the floor at constant velocity if the coefficient of kinetic friction between the chair and the floor is 0.64 and you are pushing at an angle of 30.2° relative to the floor?

  • a. 231.5 J
  • b. 231.6 J
  • c. 231.7 J
  • d. 231.8 J

736. If you do 231.9 J of work to move a 19.8 kg chair 3.35 m across the floor at constant velocity, and you are pushing at an angle of 17.9° relative to the floor, what is the coefficient of kinetic friction between the floor and the chair?

  • a. 0.30
  • b. 0.31
  • c. 0.32
  • d. 0.33

737. A 80.4 kg diver jumps from a height of 2.64 m with an initial speed of 1.25 m/s. What is his speed entering the water?

  • a. 7.301 m/s
  • b. 7.302 m/s
  • c. 7.303 m/s
  • d. 7.304 m/s

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

Print Friendly, PDF & Email
Please do Subscribe on YouTube!

P inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. Also provides professionals with materials for their lectures and practice exams. Help me go forward with the same spirit.

“Will you subscribe today via YOUTUBE?”


Add Comment

PinoyBIX Engineering. © 2014-2020 All Rights Reserved | How to Donate? | Follow me on Blogarama Protection Status

Math Solution

Advanced Math problem age work mixture digit motion Analytic Geometry 01 problem Analytic Geometry 02 problem clock variation progression misc Combination problem Differential Calculus 01 Problem Differential Calculus 02 Problem Differential Equations Problem Fundamentals in Algebra Fundamentals in Algebra Problem Integral Calculus problem Permutation problem Plane Geometry problem Plane Trigonometry problem Probability problem quadratic equation binomial theorem logarithms Solid Geometry problem Spherical Trigonometry problem System of Numbers Problem Venn Diagram Problem

Questions and Answers in Mathematics

Advanced Math Age Work Mixture Digit Motion Algebra and General Mathematics Analytic Geometry 01 Analytic Geometry 02 Calculus Clock Variation Progression Misc Differential Calculus 01 Differential Calculus 02 Differential Equations Engineering Mathematics Geometry Integral Calculus Plane Geometry Plane Trigonometry Probability and Statistics Quadratic Equation Binomial Theorem Logarithms Solid Geometry Spherical Trigonometry System of Numbers Trigonometry


Pre-board in Electronics Engineering

Answers Pre-board in Electronics Engineering - Answers

Questions and Answers

Basic Television - Grob TV Boylestad Questions and Answers Computer Principles Electrical Circuit Electricity and Magnetism Fundamentals Electronic Circuits Floyd Questions and Answers Floyd Self-test Gibilisco Questions and Answers Grob Questions and Answers Industrial Electronics Principles and Applications Malvino Questions and Answers Microelectronics Power Generators / Sources / Principles and Applications Solid State Devices Tests and Measurements Vacuum Tubes

Pre-board in Communications Engineering


Questions and Answers

Acoustics Antennas Blake Questions and Answers Broadcasting and Cable TV System Digital Communication Networks Forouzan Frenzel Self-test Kennedy Questions and Answers Microwave Communications Miscellaneous Questions in Communications Modulation Navigational Aids and Radar Systems Noise Optical Fiber Communications Radiation and Wave Propagation Satellite Communications Transmission Fundamentals Wire and Wireless Communications

GEAS Solution

Dynamics problem Economics problem Physics problem Statics problem Strength problem Thermodynamics problem

Pre-board in GEAS

Questions and Answers in GEAS

Engineering Economics Engineering Laws and Ethics Engineering Management Engineering Materials Engineering Mechanics General Chemistry Giancoli Physics Physics Strength of Materials Thermodynamics
Online Tool: Electrical Charge Conversions
Online Tool: Electrical Charge Conversions
Online Tool: Color Code Conversions
Online Tool: Color Code Conversions
Online Tool: Weight Measurement Conversions
Online Tool: Weight Measurement Conversions
Online Tool: Temperature Measurement Conversions
Online Tool: Temperature Measurement Conversions