WAEC 2024 Physics | Essay

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Question 1 View Details
Question Parts
(a)
Derive the dimension of surface tension.
(b)
Name the instrument used to measure the force of gravity at a place.
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Question 2 View Details
Question Parts
(a)
State two uses of a polar satellite.
(b)
What does the slope of a graph of tensile stress against tensile strain represent?
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Question 3 View Details
State the S.I. base units of the following quantities:
Question Parts
(a)
A stress force constant;
(b)
Planck's constant.
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Question 4 View Details
An object projected at an angle to a level ground has a time of flight \( 4 s \) to move through still air. Calculate the maximum height attained by the object. \( \left[g=10 m s^{-2}\right] \)
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Question 5 View Details
State three uses of ferromagnetic materials.
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Question 6 View Details
An electron of mass, \( m \) and charge, \( e \) moves through the electric field of potential difference, \( V_{0} \) with a speed, \( v \). Show that the de Broglie wavelength associated with the electron is given as \( \lambda=\frac{h}{\sqrt{2 m e V_{0}}} \), where \( h \) is the Planck's constant.
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Question 7 View Details
The fractional change in length produced in an elastic material of spring constant \( 680 \mathrm{Nm}^{-1} \) when a force of 306 \( N \) is applied to stretch it is 1.5. Calculate the original length of the material.
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Question 8 View Details
State the effect of increasing temperature on the viscosity of a;
Question Parts
(i)
liquid;
(ii)
gas.
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Question 9 View Details
Question Parts
(i)
What is a thermometric liquid?
(ii)
State the reason for the following design features of a clinical thermometer.
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Question 10 View Details
Question Parts
(a)
State the condition for light ray incident on a concave mirror to reflect through the principal focus of the mirror.
(b)
Explain spherical aberration as a defect of curved mirrors.
(c)
The diagram below illustrates an image formed when an object is placed in front of a particular lens.
(d)
What is meant by accommodation in connection to the human eye?
(e)
State quantitatively, the values of the near and far point of a normal human eye.
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Question 11 View Details
Question Parts
(i)
State the condition for a charged particle to experience a force in a magnetic field.
(ii)
State the expression for the magnetic force, \( F \) acting on a charged particle, \( Q \) in a magnetic field of flux density, \( \beta \) with a speed, \( V \).
(iii)
Prove quantitatively that there is no magnetic force moving along the direction of a magnetic field.
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Question 12 View Details
Question Parts
(a)
Mention three facts about the photoelectric effect.
(b)
An electric magnetic radiation source of power \( 6 \times 10^{-3} W \) emits \( 1 \times 10^{16} \) photons per second. The most energetic photoelectron ejected from a metal surface is stopped by a potential difference of \( 2.2 V \). Calculate the work function of the metal. [mass of (photo) electrons \( 9.1 \times 10^{-31} \mathrm{~kg} \), ic \( =1.6 \times 10^{-19} \) C]
(c)
State two factors on which the activity of a radioactive sample depends.
(d)
Cobalt-60 source has an activity of \( 2.0 \times 10^{6} B q \) and a half-life of \( 1.8 \times 10^{8} s \). Calculate the number of radioisotope nuclei in the source.
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