UTME 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?
A. Heat → Light → Sound → Kinetic
B. Kinetic → Light → Heat → Electricity
C. Heat → Kinetic → Electricity → Heat and Light
D. Electricity → Kinetic → Heat → Light
Question 2
The linear expansivity of brass is 2 \( \times 10^{-5} \mathrm{C}^{-1} \). If the volume of a piece of brass is 15.00 \( \mathrm{~cm}^{3} \) at \( 0^{\circ} \mathrm{C} \), what is the volume at \( 100^{\circ} \mathrm{C} \)?
A. \( 16.03 \mathrm{~cm}^{3} \)
B. \( 15.09 \mathrm{~cm}^{3} \)
C. \( 16.00 \mathrm{~cm}^{3} \)
D. \( 15.03 \mathrm{~cm}^{3} \)
Question 3
The differences observed in solids, liquids and gases may be accounted for by:
A. their relative masses.
B. their melting points.
C. the spacing and forces acting between the molecules.
D. the different molecules in each of them.
Question 4
In homes, electrical appliances and lamps are connected in parallel because:
A. less current will be used
B. less voltage will be used
C. parallel connection does not heat up the wires
D. series connection uses high voltage.
Question 5
The pitch of an acoustic device can be increased by
A. decreasing the loudness
B. increasing the amplitude
C. increasing the frequency
D. decreasing the intensity.
Question 6
Natural radioactivity consists of the emission of
A. \( \alpha \) -particles and \( \beta \) -rays
B. \( \alpha \) -particles and \( X-rays \)
C. \( \alpha \) -particles,\( \beta \) -rays and \( \gamma \)-rays
D. \( \gamma \) -rays and \( X \)-rays
Question 7
Which of the following obeys Ohm's Law?
A. All metals
B. Diode only
C. All electrolytes
D. Glass
Question 8
In the diagram above, if the atmospheric pressure is 760 mm, the pressure in the chamber G is
A. 660 mm
B. 830 mm
C. 690 mm
D. 860 mm
Question 9
Convex mirrors are used as driving mirrors because images formed are:
A. erect, virtual and diminished
B. erect, real and diminished.
C. erect, virtual and magnified.
D. inverted, virtual and diminished.
Question 10
The figure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0 N. If the efficiency of the machine is 40%, then the value of W is
A. 28.0 N
B. 48.0 N
C. 288.0 N
D. 50.0 N
Question 11
Cathode rays are
A. High-energy electromagnetic waves
B. protons
C. neutrons
D. streams of electrons
Question 12
What effort will a machine of efficiency \( 90\% \) apply to lift a load of 180 N if its effort arm is twice as long as its load arm?
A. \( 100 N \)
B. \( 90 N \)
C. \( 80 N \)
D. \( 120 N \)
Question 13
Which of the following may be used to explain a mirage? \( I. \) Layers of air near the road surface have varying refractive indices in hot weather \( II. \) Road surfaces sometimes become good reflectors in hot weather. \( III.\) Light from the sky can be reflected upwards after coming close to the road surface.
A. I and III only
B. II and III only
C. II only
D. I, II and III
Question 14
The electrochemical equivalent of silver is 0.0012 g/C. If 36.0 g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5.0 minutes, the current must be
A. 6000 A
B. 100 A
C. 10 A
D. 1 A
Question 15
In the diagram above, Which of the simple pendula will resonate?
A. R and T
B. P and Q
C. R and S
D. Q and R

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