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GNP501-HSP511S- GENERAL - HEALTH PHYSICS - 2ND OPP - JULY 2023 |
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nAm I BIA un IVERSITY
OF SCIEnCE Ano TECHn0L0GY
FACULTY OF HEALTH, NATURAL RESOURCES AND APPLIED SCIENCES
SCHOOL OF NATURAL AND APPLIED SCIENCES
DEPARTMENT OF BIOLOGY, CHEMISTRY AND PHYSICS
QUALIFICATION: BACHELOROF SCIENCE
BACHELOROF HUMAN NUTRITION
BACHELOROF ENVIRONMENTAL HEALTHSCIENCES
BACHELOROF HEALTHINFORMATION SYSTEMSMANAGEMENT
BACHELOROF MEDICAL LABORATORYSCIENCES
QUALIFICATION CODE: 07BOSC,
08BOHN, 08BOHS, 07BHIS, 08BBMS
LEVEL: 5
COURSE CODE: GNPS0lS
HSPSllS
COURSE NAME: GENERAL PHYSICS lA
HEALTH SCIENCE PHYSICS
SESSION: JULY 2023
DURATION: 3 HOURS
PAPER: THEORY
MARKS: 100
SECOND OPPORTUNITY/SUPPLEMENTARY
EXAMINER{S)
DR MUNYARADZI ZIVUKU
DR VAINO INDONGO
MODERATOR: PROF. DIPTI SAHU
EXAMINATIONS QUESTION PAPER
INSTRUCTIONS:
1. Answer all the questions in the booklet provided
2. Show clearly all the steps used in the calculations
3. All written work MUST be done in blue or black ink and sketches must be
done in pencils.
PERMISSIBLE MATERIALS
Non-Programmable Calculator
THIS MEMO CONSISTS OF 7 {INCLUDING THIS FRONT PAGE)
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SECTION A (40)
QUESTION 1 (40)
Multiple choice questions types: Each question carries two marks
1. Dimensional analysis is a method used to .................. .
(2)
A. torture mankind.
B. convert from one unit into another unit.
C. cure mental illness.
D. make kids really mad.
2. . ............. is a unit of force?
(2)
A. kg.m/s 2
B. kg
c. mis
D. cm 3
3. Which of the following physical quantity is dimensionless?
(2)
A. Momentum
B. Strain
c. Stress
D. Force
4. The dimensional formula of momentum is ........... .
(2)
A. MLT
B. MLT- 1
C. MOLOT-1
D. M-1LT-1
5. The dimensions of Force are;
(2)
A. MLT
B. ML2T-2
c. MLT-2
D. ML2T-1
6. The rate of change of displacement of a particle is referred to as
(2)
A. speed
B. velocity
c. acceleration
D. power
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7. The difference between speed and velocity is:
(2)
A. speed has no units
B. they use different units to represent their magnitude
C. speed shows only magnitude, while velocity represents both magnitude
(strength) and direction
D. velocity has a higher magnitude
8. If vector a= Si and b = -8j . The scalar product is...................
(2)
A. -40k
B. 40 k
C. 0
D. None of the above
9. Which of the following is not true?
(2)
A. velocity can be negative
B. velocity is a vector
c. speed is a scalar
D. speed can be negative
10. The forces of 20 N towards north and 12 N towards south are acting on
an object. What will be resultant force?
(2)
A. 32 N toward north
B. 20 N towards north
C. 32 N towards south
D. 8 N towards north
11. A toy car moves 8 m in 4 s at the constant velocity. What is the car's
velocity?
(2)
A. 1 m/s
B. 2 m/s
C. 3 m/s
D. 4 mis
12. A train moves at a constant velocity of 50 km/h. How far will it move in
0.5 h?
(2)
A. 10 km
B. 20 km
C. 25 km
D. 50 km
13. A boat can move at a constant velocity of 8 km/h in still water. How long will it
take for the boat to move 24 km?
(2)
A. 2 h
B. 3 h
C. 4 h
D. 6 h
14. The property of water whereby molecules tend to stick to one another is
called:
(2)
A. Cohesion
B. Polarity
C. Adhesion
D. Viscosity
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USE THE GRAP BELOW TO ANSWER QUESTION 15 AND 16
The graph represents the relationship between velocity and time for an object
moving in a straight line. Use this graph to answer questions 14 and 15
v 1'()a (m/s)
'9
'
8
1
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7
..
.-
.
6
5
I
I
.
j.
3
2
.
I
t (s) I
I
I
o 1 2 3 4 5 6 7 .s •9 10
15. Which of the following statements is true?
(2)
A. The object speeds up
B. The object moves with a constant velocity
C. The object stays at rest
D. The object is in free fall
16. What is the acceleration of the object after 5 s?
A. O m/s 2
B. 3 m/s
C. 4 m/s 2
(2)
D. 5 m/s 2
17. A projectile is fired at an angle of 60.0° above the horizontal with an initial
speed of 30.0 m/s. How long does it take the projectile to reach the highest
point in its trajectory?
(2)
A. 1.5 s
B. 2.7 s
C. 6.2 s
D. 9.8 s
18. What is the force of gravity that is exerted on earth by the sun? Given that the
mass of the sun and the earth are 1.99 x 1030 kg and 5.97 x 1024 kg respectively.
The distance between the sun and the earth is 1.496 x 10-11 m and G is 6.67 x
o· 1 11N.m 2/kg 2
A. 3.54 X 1022 N
B. 4.54 X 1021 N
C. 3.45 X 1022N
D. 4.54 X 1022 N
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19. Water is flowing in a fire horse with a velocity of 1.0 m/s and a pressure of 200
000 Pa. At the nozzle the pressure decreases to atmospheric pressure (101
300 Pa), there is no change in height. The density of water is 1000 kg/m3 and
gravity g is 9.8 m/s2.
Using Bernoulli principle, the velocity of the water exiting the nozzle.
(2)
A. 12 m/s
C. 13.5 m/s
B.
14 m/s 2
D. 14m/s
20. Which of the following statement is incorrect about Newton Laws
(2)
A. Newton s first law is sometimes known as the law of inertia
B. Newtons second law is states that the force is equal to the mass multiply by
the acceleration of the object.
C. Newton s second law states that the force is inversely proportion to
acceleration of the object
D. None of the above
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SECTION 8
QUESTION 2 (15)
2.1 Derive the dimensions of:
(i)
pressure
(2)
(ii) surface tension
(2)
2.2 Use dimensionally analysis to prove whether kinetic energy is equals to gravitational
potential energy.
(3)
2.3 The force F of the wind on the moving car is certainly affected by its velocity v of the
car density p and the surface area A of the car directly exposed to the wind's direction.
Use dimensional analysis to show the equation of force.
(8)
QUESTION 3 (10)
3.1 Given three vectors;
a= i + 2j +3k,
b = 2i +3j + k
c = 7i +2j +k,
(i)
Evaluate vector p, such that p = (ax b) + (ax c)
(8)
(ii) From (i), find a unit vector n in the direction of p.
(2)
QUESTION 4 (20)
4.1 An object is projected from a height of 100m above the ground at an angle of 30°to
the horizontal with a velocity of 100m/s.
Calculate;
(i) Maximum Height reached by the object
(3)
(ii) the distance the object travels from the cliff
(2)
4.2 Two blocks of mass 0.1 kg and 0.2 kg approach each other on a horizontal plane at
velocities of 0.4 and 1m/s respectively. If the blocks collide and remain together,
calculate the joint velocity after collision.
(5)
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4.3 An object of mass m is attached to a spring of length L. If the spring is extended by
a distance e and released, show that the period of oscillation is given by;
H, T = 2"
where g is the acceleration due to gravity.
(3)
4.4 State any two assumptions considered in studying fluid dynamics.
(2)
4.5 When 620 g of water is cooled from 92.2°C to 4.5°C and the specific heat capacity, c,
of water is 4186 Jkg- 1 c-1 .
Determine the:
(i)
Amount of heat transferred in Kilo Joules
(3)
(ii) initial temperature of water in Fahrenheit
(1)
(iii) final temperature of water in Kelvin
(1)
END OF THE EXAMINATION PAPER
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