Question Library

An electric lamp rated 120W is used on a 240Vrms, calculate the resistance of its filament

Which of the following statements about a bar magnet is correct?

The force experienced by a current-carrying conductor move in a magnetic field is employed in the working of the i. moving coil ammeter ii. electric bell iii. electric motor. Which of the statements above are correct?

The breaking up of an atomic nucleus into the fragment of nearly equal size is known as

A 500kV is applied across an X-ray tube. Calculate the maximum velocity of the electrons produced [Me = 9.1 x 10\(^{-31}\)kg, e = 1.6 x 10\(^{-19}\)C]

A radioactive substance of mass 768g has a half life of 3 years. After how many years does this substance leave only 6g undecayed?

Fusion is not usually used for generating electric power because

An atom \(^{234}_{91} P\) emits a gamma radiation. The resultant nuclide is

The diagram above shows the speed-time graph of a car.If the car covered a total distance of 600m in 25s, calculate its maximum speed

Determine the magnitude of P in the diagram above

You have been provided with a rectangular glass prism, optical pins, and other necessary apparatus. Using the above diagram as a guide, carry out the following instructions: Fix the drawing paper provided to the drawing board Place the glass prism on the drawing paper and trace the outline, ABCD of the prism Remove the prism, mark a point O on AB such that AO is about one-quarter of AB Draw a normal through point O. Also draw an incident ray to make an angle i = 25 with the normal at O. Fix two pins at \(P_1\) and \(P_2\) On the incident ray. Replace the prism. Fix two other pins at \(P_3\) and \(P_4\) such that the pins appear to be in a straight line with the images of the pins at \(P_1\) and \(P_2\) when viewed through the block along DC remove the prism. Join points Pa and P4 and produce it to meet DC at 1. Also, draw a line to join Ol ( With O as center and using any Concinient radius, draw a circle to Cut the incident ray and the refracted ray at E and H respectively. Maintain this radius throughout the experiment Draw the perpendiculars EF and GH. Measure and record d= EF and I= GH. Repeat the procedure for four other values of i = 35^\circ, 45, 55^\circ, and 65^\circ respectively. In each case measure and record d and I Plot a graph of d on the vertical axis against I on the horizontal axis Determine the slope of the graph State two precautions taken to ensure accurate results. [Attach your traces to your answer booklet) (b)i. State Snell's law. ii. Calculate the critical angle for a water-air interface. [refractive index of water = \(\frac{4}{3}\)]

(a) Explain the statement the acceleration of free fall cohesion. (b) State two factors that can affect the value of the narrow glass tube has a concave meniscus while acceleration of free fall at a place.

A particle is projected horizontally at 10 ms\(^{-1}\) from a height of 45m. Calculate the horizontal distance covered by the particle before hitting the ground. [g = 10ms\(^{-1}\)]

A particle dropped from a vertical height and falls freely for a time interval t. Sketch and explain a graph to show how h varies with (a) t (b) t\(^{2}\).

The diagram below represents the graph of the force applied in stretching a spiral spring against the corresponding extension produced within its elastic limit. Using the notations on the graph, determine the: (a) force constant of the spring; (b) work done in stretching the spring from 10 x 10\(^{-2}\)m to 20 x 10\(^{-2}\)m.