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Given Sin (90 – a) = 1/2 , find without using tables or calculators the value of Cos a.
Date posted:
November 5, 2019
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Solve the equation below.
Date posted:
November 5, 2019
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Use logarithms to evaluate
Date posted:
November 5, 2019
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A certain metal is illuminated with radiation of different frequencies and corresponding stopping potential determined. The graph in figure below shows how the stopping potential vary with frequency. Electronic charge, e =1.6x10-19C
Using the graph determine
i) Planks constant.
ii) Work function of the metal
Date posted:
November 4, 2019
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The minimum frequency of light that causes photoelectric emission from a metal surface is 6.4 x 1014Hz . When the surface is irradiated with a certain source , electrons are dislodged With a speed of 7.2 x 105m/s.Given that h = 6.63 x 10-34Js and m = 9.11 x 10-31kg , calculate
i) The work function of the metal
ii) The maximum kinetic energy of the photoelectrons
Date posted:
November 4, 2019
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Draw the electric field pattern between the positive point charge and the negatively charged plate in figure below.
Date posted:
November 4, 2019
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You are provided with three capacitors with capacitance 2µf, 5µf and 3µf .
i) Sketch a diagram showing how the three capacitors can be connected to produce
maximum capacitance.
ii) Determine the maximum capacitance.
iii) The arrangement in (i) above is connected in series with a 12V battery.
Calculate the work done in charging the capacitors.
Date posted:
November 4, 2019
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Draw labeled diagram of a simple a.c generator.
Date posted:
November 4, 2019
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In an experiment to determine the focal length of a concave mirror, magnification M was determined for various image distance V. The figure below shows a graph of magnification M against image distance V for the results from the experiment.
Use the graph to determine:
i) The focal length ,f of the mirror, given that M= 1 - v/f
ii) The image distance when the magnification is 0.6.
Date posted:
November 4, 2019
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An upright object is placed in front of a converging (convex lens). An image magnified 3 times was formed on the screen. If the distance between the object and the screen was 80cm, determine:-
i) The object distance.
ii) The focal length of the lens.
Date posted:
November 4, 2019
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State what happens to the wavelength of a water wave when it moves from shallow to deep water.
Date posted:
November 4, 2019
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Draw a circuit diagram showing how a single diode can be used in half wave rectification.
Date posted:
November 4, 2019
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Illustrate by means of diagram what is meant by diffraction.
Date posted:
November 4, 2019
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Figure below shows resistors connected in an electric circuit.
Determine the reading of the ammeter.
Date posted:
November 4, 2019
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The figure below shows a wire wound round a soft iron core. A copper cube ,R, is placed just
below end Q.
i) Identify poles P and Q when switch S is closed.
ii) State and explain what happens to copper cube R when switch S is closed.
Date posted:
November 4, 2019
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A pinhole camera is designed with many pinholes. State and explain what is observed on the image when the number of pinholes is decreased.
Date posted:
November 4, 2019
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The figure below shows two plane mirrors inclined at 450 to one another. A ray of light is incident to the top mirror at 450.
Draw the path followed by the ray after reflection.
Date posted:
November 4, 2019
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The table below shows data collected during investigation of Hooke’s law.
a). Complete the table.
b). Using the data in the table, plot a graph of force, F against extension, e in the attached gird below.
c). On the graph, indicate X, at the elastic limit
d). From the graph, determine the elastic spring constant for the material.
Date posted:
November 4, 2019
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A 2kg particle tied to rope is rotated about a circle of radius 10 m. given that the maximum tension allowed in the rope is 50 N, determine the maximum speed of the particle if it is rotating in a:-
i). horizontal path.
ii). vertical path.
Date posted:
November 4, 2019
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What is the difference between uniform linear motion and uniform circular motion?
Date posted:
November 4, 2019
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What property of a gas makes it suitable for inflating tubes?
Date posted:
November 4, 2019
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The figure below shows a 4m long uniform metal rod balanced horizontally when two forces act on it as shown.
Determine the value of F given that the rod weighs 8 N.
Date posted:
November 4, 2019
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Name one scientific skill learnt in a physics practical class.
Date posted:
November 4, 2019
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The temperature of water in a measuring cylinder is raised from 0oC to 15oC. Sketch the graph of volume against temperature.
Date posted:
November 4, 2019
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The figure below shows air blown into a major tube attached to two minor tubes that have been immersed in water. Explain what is observed then indicate the levels of water in the tubes of beaker X and Y.
Date posted:
November 4, 2019
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Two identical springs in figure below, each of spring constant 6N/cm has negligible weight. They are used to support a load of 4 kg as shown. Determine the total extension of the system.
Date posted:
November 4, 2019
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The micrometer screw gauge shown in figure below had a zero error of – 0.05 mm and was used to measure the diameter of a steel ball bearing.
Find the radius of the ball bearing whose diameter is recorded by the instrument.
Date posted:
November 4, 2019
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The sketch below represents the curve y=x2+5 and a straight line PQ which meets the x-axis and
y-axis at the points (-4, 0) and (0, 8) respectively. The line intersects the curve at point P and Q as
shown.
a) Find the equation of the line in the form y = mx + c
b) Determine the co-ordinates of P and Q
c) Calculate the area of the shaded region
Date posted:
November 2, 2019
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A quantity A varies jointly as the cube of y and inversely as the square root of x. If A = 7 when
y=2 and x=25,
(a) Write an equation convecting A, x and y
(b) Find the value of y to three significant figures, when A=12 and x=36
(c) Find the percentage change in A when y is decreased by 11% and x is increased by 21%.
Date posted:
November 2, 2019
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The first three terms of a G.P. are the first, fourth and tenth terms of an A.P. Given that the first
term is 6 and that all the terms of the G.P. are different, find the common ratio.
Date posted:
November 2, 2019