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Foundation Physics And Electricity For It Question Paper
Foundation Physics And Electricity For It
Course:Diploma In Information Technology
Institution: African Institute Of Research And Development Studies question papers
Exam Year:2010
STAGE I EXAMINATION FOR THE DIPLOMA IN INFORMATION
TECHNOLOGY
DIT 102: FOUNDATION PHYSICS AND ELECTRICITY FOR IT
DATE: MARCH 2011 TIME: 1 ½ HOURS
INSTRUCTIONS: Answer any THREE questions
CONSTANTS: Mass of an electron = 9.1x 10-31Kg
Charge of an electron= 1.6x10 -19C
Acceleration due to gravity, g=9.81 ms-2
Speed of light, c = 3x108ms-1
Speed of sound vs = 340 ms-1
QUESTION ONE
a) Define the terms acceleration and velocity [2 marks]
b) From your definition in Q1(a) above name three ways in which a ‘matatu’ driver may cause the
‘matatu’ to accelerate. [3 marks]
c) A train starts from rest with an acceleration of 21.8cm/s2 for 7.2 minutes. Calculate
[total 11 marks]
i) The final velocity [m/s] [3.5 Marks]
ii) The displacement while it accelerates [Km] [3 Marks]
iii) The approximate distance travelled in 2hrs assuming no further acceleration [2 Marks]
iv) The acceleration when brakes are applied if the emergency stopping distance is 110m.
[2.5 Marks]
d) Calculate average speed of a person who travels 1.2Km in 30 minutes. [2 Marks]
2
e) Expalin the difference between speed and velocity [2 Marks]
QUESTION TWO
a) Explain the difference between energy and work. Give the unit of measure for each [5 Marks]
b) A pendulum when fully displaced attains the terminal point, when at rest the equilibrium point
and intermediate points in between when in motion.
i) Draw a well labeled diagram showing these points.
ii) Further fully describe the kind on energy exhibited at each of these points when the
pendulum is in motion. [6 Marks]
c) A constant 120.0N force is applied on an 8.2Kg mass for 1.37s to raise it up. Calculate
[total 9 marks]
i) The weight of the mass [1.5 Marks]
ii) The net force acting on the mass [2 Marks]
iii) The acceleration [2 Marks]
iv) The height attained [2 Marks]
v) Work done [1.5 Marks]
QUESTION THREE
a) State Joule’s law, Ohm’s law and Coulomb’s law, giving the mathematical expression (all
variables and their units must be given) [7 Marks]
b) Using the theory of the atom explain how static electricity is produced [6 Marks]
c) Draw an electric circuit having two lamps each of 100 Ohms resistance across a 12V
source. Calculate [total 8 Marks]
i) The current flowing through each lamp (in mA) [2.5 Marks]
ii) The total power consumption [1.5 Marks]
iii) The resistance of a lamp added in parallel to the others so as to increase the power by
50% [4 Marks]
QUESTION FOUR
a) Define the terms wave, frequency, cycle and electromagnetic wave [4 Marks]
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b) Name any three EM waves in the EM wave spectrum that are used in data communications. Give
an advantage of each. [6 Marks]
c) Describe the role of magnetism in generating electric energy [6 Marks]
d) A motor-cyclist riding at 110Km/hr hoots at a pedestrian 100m away who is walking towards him
at 6Km/hr. If the speed of sound is 340m/s what is the distance between them when the pedestrian
hears the hooting cyclist.(state any assumptions made) [4 Marks]
QUESTION FIVE
a) Briefly discuss Newton’s laws of motion [6 Marks]
b) Mention any three fundamental SI units [3 Marks]
c) From Newton’s second law derive the units for Force and Work (in fundamental SI units only)
[4 Marks]
d) Make the following conversions
i) 9825849gm/min2 to Kgm/s2
ii) 0.00855s to ms [4 Marks]
e) Calculate the angle of refraction in the second material if the refractive index of material in the first medium is 1.52 while that of the second is 1.46 and air is 1.0003. angle of incidence to the first is
50o degrees [3 Marks]
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