2016 WAEC ESSAY QUESTIONS MAY/JUNE
1.State the dimensions of:
a. impulse b. acceleration c. work
2.A projectile is fired with a velocity of 20 ms-1 at an
angle of 40o to the horizontal. Determine the components of the
velocity of the projectile at its maximum height.
3.State three different materials that can be used to
demonstrate brownian motion.
4.An electron enters perpendicularly into a uniform magnetic
field which has a flux density of 0.12T. This results in a magnetic force of
9.6 x 10-19 N on the electron. Calculate the speed of the electron
as it enters the magnetic field.(e = 1.6 x 10-19 C)
5.List three uses of rockets
7
The diagram above illustrates a cathode ray tube Identify
the components X, Y and Z
8.(a) Explain the
term net force
(b) Define the principle of conservation of linear momentum
and state one example of it
(c) A ball of mass 200 g released from a height of 2.0 m
hits a horizontal floor and rebounds to a height of 1.8 m. calculate the
impulse received by the floor. (g = 10 ms-2)
(d) A body of mass 20 g performs a simple harmonic motion at
a frequency of 5 Hz.
At a distance of 10 cm from the mean position, its velocity
is 200 cms-1. Calculate its:
i. Maximum displacement from the mean position; ii. Maximum
velocity;
iii. Maximum potential energy (g = 10 ms-2; pi=
3.14)
9. a. Explain the
terms
i. Thermal equilibrium ii. Fundamental interval
b. List two uses of the hydraulic press
c. Name the material used to reset the steel index in the
Six’s maximum and minimum thermometer
d. (i) A nursing mother prepared her baby’s milk mixture at
85oC, in a feeding bottle. In order to cool it to 40oC,
she immersed the bottle in an aluminium bowl of heat capacity 90 J K-1
containing 500 g of water at 26oC. If the mass of the mixture is
300g, calculate the specific heat capacity of the mixture.
[Neglect heat losses and heat capacity of the bottle;
specific heat capacity of water = 4200 J kg-1 K-1]
(ii) (a) Name two ways through which the bottle losses heat.
(b) Name two industrial processes in which heat exchanger is used.
10. a) Define critical angle
b) How are anti-nodes created in a stationary wave?
c) The angle of
minimum deviation of an equilateral triangular glass prism is 46.20.
Calculate the refractive index of the glass.
d) An illuminated object is placed in front of a concave
mirror and the position of a screen is adjusted in front of the mirror but no
image is obtained on the screen. Give two possible reasons for this
observation.
e) An illuminated object is placed at a distance of 75 cm
from a converging lens of focal length 30 cm i. Determine the image distance
ii. If the lens is replaced by another converging lens, the object has to be
moved 25 cm further away to have its sharp image on the screen. Determine the
focal length of the second lens.
11. (a) Explain briefly dielectric strength
(b) An electromagnetic wave has its wavelength shorter than
those of radio wave and microwave but longer than that of visible light.
i. Identify the wave ii. Name one suitable detector for the
wave. iii. Name one source of the wave.
(c) An oil drop carrying a charge of 1.0 x 10-19
C is found to remain at rest in a uniform electric field of intensity 1200 N C-1.
Calculate the weight of the oil drop.
(d) An RLC series circuit consists of 100 ohm resistor, 0.05 H
inductor and a 25 µF capacitor. A 220 V, 50 Hz mains voltage is
applied across the circuit. Calculate the: i. Impedance ii. Current (pi= 3.14)
12.(a) Explain the following terms:
i. Mass defect ii. Binding energy of a nucleus.
(b)
(i) Assuming the wave nature of an electron, what is the
effect of decreasing the speed of a photoelectron on its; (a) wavelength? (b)
energy?
(ii) A particle of mass 4.4 x 10-23 kg moves with a velocity of 105 ms-1. Calculate its wavelength. (h = 6.6 x 10-34 Js)
The diagram above shows part of a radioactive decay series.
Use it to answer the following questions.
(i) Name a pair of isotopes
(ii) Name the isotopes with which the series starts.
(iii) Write down a nuclear equation for two examples of each
of: (α) alpha decay; (β) beta decay.
Check my next post for solutions to these questions
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