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GNP502S - GENERAL PHYSICS 1B - 1ST OPP - NOVEMBER 2023 |
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nAml BIA UnlVERSITY
0 F science Ano TECHn OLOGY
FacultyofHealth,Natural
ResourceasndApplied
Sciences
Schoolof NaturalandApplied
Sciences
Departmentof Biology,
Chemistryand Physics
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QUALIFICATION: BACHELOR OF SCIENCE
QUALIFICATION CODE: 07BOSC
COURSE:GENERAL PHYSICS lB
DATE: NOVEMBER 2023
DURATION: 3 HOURS
LEVEL:5
COURSECODE: GNPS02S
SESSION: 1
MARKS: 100
FIRST OPPORTUNITY: QUESTION PAPER
EXAMINER:
MODERATOR:
INSTRUCTIONS:
PROF SYLVANUS ONJEFU
DR EMMANUEL EJEMBI
PROF DIPTI SAHU
1. Answer all questions on the separate answer sheet.
2. Please write neatly and legibly.
3. Do not use the left-side margin of the exam paper. This must be allowed for the examiner.
4. No books, notes and other additional aids are allowed.
5. Mark all answers clearly with their respective question numbers.
PERMISSIBLE MATERIALS
1. Non-Programmable Calculator
ATTACHEMENTS
1. None
This paper consists of 6 pages including the front page
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SECTION A
QUESTION 1
Suggested Question Types: Multiple Choice/Objectives
Each question in this section carries two marks
[40 MARKS]
1.1 One of these is not a wind instrument.
(2)
a. clarinets b. drums c. trumpets
d. flutes
1.2 Sound wave below 20 Hz is called what?
(2)
a. ultrasonic wave b. audible wave c. infrasonic wave d. critical wave
1.3 One of the following is not an example of electromagnetic waves.
(2)
a. beta b. gamma
c. x rays d. ultraviolet light
1.4 A beam of polarized light is one constrained to vibrate in a ............ plane
perpendicular to the beam.
(2)
a. multiple b. triple c. single d. quadruplet
1.5 In which of the following is the speed of sound greatest?
(2)
a. air at 100°c
b. water
c. wood
d. steel
1.6 The change of direction of wave front because of a change in the velocity
of the wave in another medium is called what?
(2)
a. Polarization
b. interference
c. diffraction
d. refraction
1.7 ........... is the unit of frequency.
(2)
a. decibel b. meters c. Hertz d. seconds
1.8 Which of the following statements about images formed by a plane mirror
is false? It is;
{2)
a. The same size as the object b. virtual c. enlarged d. lateral inverted
General Physics 1B (GNP502S)
pt Opportunity November 2023
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1.9 The combination of two overlapping waves is called what?
(2)
a. aggregate b. superposition
c. dispersion d. wavelength
1.10 Suppose the real depth of a pond is 6 m and its apparent depth is 4.5 m.
The refractive index of the water of the pond is given by?
(2)
a. 1.35
b. 1.36
C. 1.47
d. 1.33
1.11 A hunter at a distance x from a cliff fires a gun. He hears the echo from the cliff
after 2.4 seconds. If the speed of sound in air is 340 m/s, determine x.
(2)
a. 408 m b. 209 m C. 100 m d. 501 m
Questions 1.12 and 1.13 are based on the statement below:
The amplitude modulation (AM) radio band extends from 5.4 x 10 5 Hz to
1.7 x 10 6 Hz. If the speed of light is 3 xlO 8 m/s;
1.12 What is the longest wavelength in meters?
(2)
a. 1.8 x 10 2 m b. 5.6 x 10 2 m c. 6.5 x 10 3m d. 0.9 x 10 3m
1.13 Determine the shortest wavelength.
(2)
a. 1.8 x 10 2 m
b. 5.6 x 10 2 m
C. 6.5 X 10 3 m
d. 0.9 x 10 3 m
1.14 ........... image cannot be projected on a screen.
(2)
a. real
b. virtual
c. critical
d. principal
1.15 A light ray of wavelength 589 nm traveling through air strikes a smooth, flat
slab of crown glass at an angle of 30° to the normal. Determine the angle of
refraction.
(2)
a. 18.2° b. 20.1° c.17.2°
d.19.2°
1.16 A type of aberration in which the wavelength is dependent on refraction is
called what?
(2)
a. spherical aberration
c. cubical aberration
b. chromatic aberration
d. sita aberration
General Physics 18 (GNP502S)
l51 Opportunity November 2023
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1.17 The combination of rays gives rise to .............?
(2)
a. beam
b. radiation
c. particles
d. incident rays
1.18 Light reflecting off a flat mirror creates an image that appears to be ............
the mirror.
(2)
a. infront
b. behind
c. lateral d. tangential
1.19 .......... Is a device that transforms energy into a beam of coherent
monochromatic light.
(2)
a. lasers b. slit order c. path difference
d. diffraction gating
1.20 The diagram below shows a ray of light IK incident on plane mirror at K.
Calculate the angle of deviation of the ray after reflection.
(2)
0
/
IK
a.35°
b. 70° c.ss0
d.90°
General Physics 18 {GNPS02S)
1st Opportunity November 2023
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SECTION B
QUESTION 2
2.1 A plane progressive wave is represented by the equation,
;a). y = 0.3 sin ( 200rrt - 20n
Find the
2.1.1 Frequency of the wave.
2.1.2 Wavelength.
2.1.3 Its speed.
[16 MARKS]
(4)
(4)
(4)
° 2.2 If the angle of incidence for light traveling from air to glass is 45 and the
°, angle of refraction in glass is 28 Evaluate the refractive index of glass with
respect to air.
(4)
QUESTION 3
[14 MARKS]
3.1 If u is the object distance and vis the image distance, show that the
magnification M is given by; M = :u:= :f :- 1.
(5)
3.2 An object is 0.5 ft in front of a concave mirror, and the image is located 2.0 ft
behind the mirror. Find the focal length and the radius of curvature of the
mirror.
(5)
3.3 The velocity of light in air and glass are 3 x 108 m/s and 1.8 x 108 m/s
respectively. Calculate the sine of the angle of incidence that will produce
and angle of refraction of 30° for a ray of light incident on glass.
(4)
QUESTION 4
4.1 Illustrate with the aid of a diagram destructive interference.
[16 MARKS]
(3)
4.2 The distance between the two slits is 0.030 mm. The second-order bright
fringe is measured on a viewing screen at an angle of 2.15° from the central
maximum. Evaluate the wavelength of the light in nano meter
(4)
4.3 What is meant by 'a beam of polarized light?
(2)
General Physics 1B (GNP502S)
i5t Opportunity November 2023
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4.4 With the aid of well labelled diagrams, illustrate the action of a Polaroid on
beam of sunlight.
(4)
4.5 list three crystals that serve as light polarizing filters.
(3)
QUESTION 5
[14 MARKS]
5.1 A train is moving toward an observer with a speed of 100 m/s. The whistle
of the locomotive has a frequency of 400 Hz, and the speed of the sound is
1100 m/s. Find the frequency heard by the observer.
(6)
5.2 Define resonance.
(3)
5.3 A glass tube of 30 cm long contains water to a height of 20 cm. If a tuning
fork of frequency 256 Hz is used to obtain the next position of resonance after
the first when the water level is 25 cm below the open end, calculate the velocity
of sound in the air.
(5)
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END OF QUESTION PAPER
General Physics 1B (GNP502S)
1st Opportunity November 2023
6