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Exercise-10A Question 1. Describe an experiment to demonstrate that there is a magnetic field around a current-carrying conductor.Solution:In Fig., AB is represented as a wire that runs from north to south and is linked to a battery via a rheostat and a tapping key. The wire is positioned right below a compass needle.(1) The needle does […]

Exercise 2(A) Question 1. Define work. Is work a scalar or a vector?Solution:Only when a body moves as a result of a force being applied to it is stated to have been done. It’s a scalar amount. Question 2. How is the work done by a force measured when:1. the force is in direction of displacement2. the […]

Question 1. (1) What do you understand by a simple machine?(2) State the principle of an ideal machine.Solution:(1) A machine is a tool that allows us to increase speed or overcome a strong resistive force by exerting a modest force at a suitable location and in the desired direction.(2) A perfect machine is one that has […]

Exercise-7a Question 1. What are mechanical waves?Solution:The waves that need a material medium to transmit energy are known as mechanical waves. Question 2. (i) Define amplitude term in relation to a wave.(ii) Define frequency term in relation to a wave.(iii) Define wavelength term in relation to a wave.(iv) Define wave velocity term in relation to a wave.Solution:(i) […]

Exercise-5a Question 1. What is a lens?Solution:A lens is a transparent refracting medium that is surrounded by two usually spherical curved surfaces. Question 2. Name the different kinds of lenses. Draw diagrams to illustrate them.Solution:There are two types of lens: –(i) Convex or converging lens,(ii) Concave or diverging lens. Question 3. State two differences between a convex and […]

Question 1. Name three factors on which the deviation produces by a prism depends and state how does it depend on the factors stated by you.Solution:The deviation produced by the prism depends on the following four factors:(a) The angle of incidence – As the angle of incidence rises, the angle of deviation initially falls and, for […]

EXERCISE-8A Question 1. Define the term current and state its S.I unit.Solution:The speed at which charges flow is known as current.I=q/t Question 2. Define the term electric potential. State its S.I. unit.Solution:Potential at a point is the effort put in to move a unit positive charge there from infinity. Volt is a SI unit, with 1 V […]

EXERCISE-9A Question 1. At what voltage and frequency is the electric power generated at the power generating station?Solution:At the power generating facility, electric power is produced at 11 KV, 50Hz. Question 2. (i) At what voltage is the electric power from the generating station transmitted? Give reason to your answer.(ii) What is the nature of current transmitted […]

EXERCISE-12A Question 1. Name the three constituent of an atom and state their mass and charge of each. How are they distributed in an atom?Solution:Three constituents of an atom are:Electrons have a mass of 9.1 X10-31 kg, -1.6 X 10-19C chargeNeutrons have a mass of 1.6749 X10-27 kg, the charge is zero.Protons have a mass of […]

Question 1. State the condition when on applying a force, the body has:a) The translational motionb) The rotational motion.Solution:a) The body creates translational motion when it is free to move.b) The body creates rotational motion when it is pivoted at a certain location. Question 2. Define moment of force and state its S.I unit.Solution:The product of the […]