**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]