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GNP502S - GENERAL PHYSICS 1B - 1ST OPP - NOVEMBER 2024 |
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nAm I BIA UnlVERSITY
0 F SCIEnCE Ano TECHn OLOGY
Facultyof Health,Natural
ResourceasndApplied
Sciences
Schoolof Natural and Applied
Sciences
Departmentof Biology,
Chemistryand Physics
13JacksonKaujeuaStreet
Private Bag 13388
Windhoek
NAMIBIA
T: +264612072012
F: +264612079012
E: dbcp@nust.na
W: www.nust.na
QUALIFICATION : BACHELOROF SCIENCE
QUALIFICATION CODE: 07BOSC
COURSE:GENERALPHYSICS1B
DATE: NOVEMBER 2024
DURATION: 3 HOURS
LEVEL: 5
COURSECODE: GNP502S
SESSION: 1
MARKS: 100
FIRST OPPORTUNITY: EXAMINATION QUESTION PAPER
EXAMINER:
MODERATOR:
INSTRUCTIONS:
PROF SYLVANUS ONJEFU
MR MARKUS HITILA
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
ATTACHMENTS
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 MARI<S]
1.1 Doppler effect is as a result of.
(2)
a. reflection b. relative motion c. rarefaction
d. beat effect
1.2 If the length of the air column in a closed pipe is 45 cm when it emits its
First overtone, the wavelength of the note produce is:
(2)
a. 180 cm b. 90 cm c. 60 cm d. 45 cm
1.3 A man standing 99 m from the foot of a tall cliff claps his hands and hears
an echo 0.6 slater. Calculate the velocity of the sound in air in ms - 1•
(2)
a.330 b. 59.4 C. 82.5 d.430
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 A radio station broadcasts at a frequency of 300 kHz. If the speed of the wave
Is 3 x 10 8 ms - 1, calculate the period and wavelength of the wave.
(2)
a.3.3x10 6 m b. 3.3 x 1O-6 m c. 1 x103 m d.1x1Q- 3 m
General Physics 1B (GNP502S)
1st Opportunity November 2024
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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
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 mis, determine x.
(2)
a. 408 m b. 209 m C. 100 m d. 501 m
1.12 Transverse and longitudinal waves travelling in the same direction in a
Medium differ essentially in their
(2)
a. Direction of vibration of the particles of the medium b. Wavelength
c. Amplitude d. Frequency
1.13 Which of the following is not a mechanical wave?
(2)
a. Radio wave b. sound wave c. water wave d. wave in a closed pipe
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°
General Physics 1B (GNP502S)
1st Opportunity November 2024
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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
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)
a.35° b.70° c.55° d.90°
General Physics 1B (GNP502S)
1st Opportunity November 2024
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SECTION B
QUESTION 2
2.1 A plane progressive wave is represented by the equation,
y = 0.3 sin ( 200rrt - 20rr ; ). Find the
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2.1.1 Frequency of the wave.
2.1.2 Wavelength.
2.1.3 Its speed.
[16 MARKS]
(4)
(4)
(4)
2.1 An object is placed in front of a converging lens of focal length 20 cm.
The image is virtual and has a magnification of 2. What is the distance
of the object from the lens?
(4)
QUESTION 3
[14 MARKS]
3.1 If u is the object distance and vis the image distance, show that the
magnification
Mis given by;
M= =
u
t-
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 1asmis and 1.8 x 1asmis
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)
P 1 Opportunity November 2024
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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)
Resonance is defined as the effect caused by a vibrating body setting another
body vibrating, both having the same natural frequency.
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)
END OF EXAMINATION PAPER
General Physics 1B (GNP502S)
1"1Opportunity November 2024
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