CIT102  FOUNDATION PHYSICS AND ELECTRICITY FOR IT KCA Certificate Past Paper

UNIVERSITY EXAMINATIONS: 2018/2019
EXAMINATION FOR THE CERTIFICATE IN INFORMATION TECHNOLOGY
CIT102 FOUNDATION PHYSICS AND ELECTRICITY FOR IT
FULLTIME/PARTIME
DATE: NOVEMBER, 2018 TIME: 2 HOURS
INSTRUCTIONS: Answer Question ONE AND any other TWO questions.

QUESTION ONE
a) Define the following terms. Give examples
i) vector
ii) scalar [4 Marks]
b) A bullet leaves a gun muzzle at 600m/s. If the barrel is 0.76m long, calculate the acceleration [3 Marks]
c) Describe the following as used in physics [6 Marks]
i. work
ii. energy
iii. simple harmonic motion
d) Differentiate between series and parallel circuits. Suitable circuit diagrams may be used [4Marks]
e) Name two types of energy [4Marks]
f) State the SI units for the following
i) Current
ii) Power
iii) Force [3Marks]
g) Define the following terms as used in electronics [5Marks]
i. free electron
ii. charge
iii. voltage
iv. current
v. resistance
QUESTION TWO
a) Describe electricity using atomic theory [6Marks]
b) State Ohms law and show the mathematical expression [3Marks]
c) Define matter and differentiate between the three main states of matter [7Marks]
d) State the newton’s first and second laws of motion [4Marks]
QUESTION THREE
a) Give the derived units for [3 Marks]
i. Velocity
ii. Kinetic energy
iii. Work
b) A 45Kg load slides down a 12m long frictionless plank that is inclined at 32o
. Calculate [7 Marks]
i. the acceleration down the incline
ii. the velocity at the bottom of the incline
iii. the KE of the load at the bottom
c) Using the circuit diagram in the accompanying diagram. Calculate [10 Marks]
i) The total circuit resistance
ii) The current from the d.c power source
iii) The current flowing through each resistor
iv) the power consumed by the circuit
QUESTION FOUR
a) Describe the three types of electrical materials. Give an example of each [6 Marks]
b) Describe the function of three electronic devices(Give the symbol and unit of measure of its property)
[6 Marks]
c) Describe how electricity is produced in a dry cell [4Marks]
d) Calculate the internal resistance of a dry cell if A pd of 4.3V is measured when a 4.5 V battery is
connected to a circuit that has a 430mA current [4 Marks]
QUESTION FIVE
a) A 5Kg cannon ball is dropped from a cliff. It hits the ground below after 2.34sec. Calculate the height of
that cliff [3 Marks]
b) A car is traveling at 67Km/hr when the driver sees a barrier. It takes 1.5sec to react. The breaks cause the
car to accelerate at -11m/s2. What is the minimum safe distance from the barrier if it is not to be hit
[5 Marks]
c) Explain the following properties of waves. Use suitable diagrams [5 Marks]
i. velocity
ii. frequency
iii. amplitude
iv. phase
d) Describe the functions of waves in the computer world [4 Marks]
e) State what the following electrical instruments will measure
i) Ohmmeter
ii) Voltmeter
iii) Ammeter [3Marks]

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