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Phys 001: Introduction To Electricity &Amp; Magnetism Question Paper

Phys 001: Introduction To Electricity &Amp; Magnetism

Course:Certificate In Computer Science

Institution: Chuka University question papers

Exam Year:2012

CHUKA UNIVERSITY

COLLEGE

UNIVERSITY EXAMINATIONS

FIRST YEAR EXAMINATION FOR THE AWARD OF
CERTIFICATE IN COMPUTER SCIENCE

PHYS 001: INTRODUCTION TO ELECTRICITY & MAGNETISM

STREAMS: CERT. (COMP.SCI) Y1S1 TIME: 2 HOURS
DAY/DATE: MONDAY 10/12/2012 11.30 A.M – 1.30 P.M.
INSTRUCTIONS:

Answer question One and any other two questions.

(a) Derive the three Newtons’ equations of motion. [6 marks]

(b) Differentiate between momentum and impulse giving the units for each.
[4 marks]

(c) State the first and second laws of electrostatics. [3 marks]

(d) “Secondary cells are preferred to primary cells”. Justify this statement clearly explaining what happens during charging of a secondary cell. [4 marks]

(e) Compare the floppy disk to the compact disk as a memory device. [4 marks]

(f) State the first law of magnetism. [1 mark]

(g) State the Farady and Lenz laws of electromagnetic induction. [4 marks]

(h) Differentiate between direct current and alternating current. [4 marks]

(a) Differentiate between charging a body by conduction and charging a body by
induction. [4 marks]

(b) Two charges are separated by 0.5m. They are moved towards each other such
that the force between them increases by 60%. How far apart are they?
[6 marks]

(c) Draw a circuit of three capacitors of 3µf each connected to a 24V voltage
source when connected.

in series
in parallel

Find the effective capacitance and the energy stored in each case. [10 marks]

(a) Draw and explain the working of an electric bell. [6 marks]

(b) A computer device of resistance 20? is operated by 6 cells of 2V each
connected in series.

What is the current through it?
How much energy does it consume in 1 second? [6 marks]

(c) Using a black circuit diagram, describe how a computer power supply works.
[8 marks]

(a) Give the main features of a displacement time and velocity time graphs.
[5 marks]

(b) A jet catapult from an aircraft carrier uniformly accelerates a plane with a mass of
1000kg uniformly from launch to a launch speed of 320hmh-1 in 200 s. What is the magnitude of the net force on the plane? [7 marks]

(c) A rifle weighs 50 N and its barrel is 0.75m long. It shoots a 25g bullet, which
leaves the barrel with a speed of 300 ms-1 (muzzle velocity) after being uniformly accelerated. What is the magnitude of the reaction force on the rifle?
[8 marks]

Name 4 computer storage devices. For each, describe how data is stored and how it is retrieved from the device. [20 marks]

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Phys 001: Introduction To Electricity &Amp; Magnetism Question Paper

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