POST UTME AAUA 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A photon has an energy of 2 eV. What is its wavelength?
A. 100 nm
B. 200 nm
C. 300 nm
D. 400 nm
Question 2
A lens with a focal length of 0.2 m is used to form an image of an object placed 0.5 m away. What is the magnification of the lens?
A. 0.4
B. 0.6
C. 0.8
D. 1.0
Question 3
A magnetic field is produced by a current-carrying wire. If the current is doubled, what happens to the magnetic field?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Remains the same
D. Decreases by a factor of 2
Question 4
A particle of mass $m$ is moving in a circular orbit of radius $r$ with a cons\tant speed $v$. The particle is subject to a centripetal force $F_c = \frac{mv^2}{r}$. What is the angular frequency of the particle?
A. \frac{v}{r}
B. \frac{mv^2}{r}
C. \frac{r}{v}
D. \frac{v^2}{r}
Question 5
A magnetic field is produced by a current-carrying wire. If the current is 2 A and the length of the wire is 0.5 m, calculate the magnetic field strength at a dis\tance of 0.2 m from the wire.
A. 0.1 T
B. 0.2 T
C. 0.3 T
D. 0.4 T
Question 6
A sound wave with a frequency of 200 Hz is traveling through a medium with a speed of 340 m/s. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2.0 m
Question 7
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8.0 x 10^-12 F, what is the charge on the plates?
A. 1.6 x 10^-10 C
B. 3.2 x 10^-10 C
C. 6.4 x 10^-10 C
D. 1.28 x 10^-9 C
Question 8
A Carnot engine operates between two temperatures of 300 K and 400 K. What is the efficiency of the engine?
A. 0.2
B. 0.3
C. 0.4
D. 0.5
Question 9
A convex lens with a focal length of 20 cm is used to form an image of an object placed 30 cm in front of it. What is the magnification of the image?
A. -0.5
B. -0.6
C. -0.7
D. -0.8
Question 10
A ray of light passes through a prism and is re\fracted. The angle of incidence is 30°, and the angle of re\fraction is 20°. What is the angle of deviation?
A. 10°
B. 20°
C. 30°
D. 40°
Question 11
A 1000 Hz AC voltage source is connected to a 50 Ω resistor. If the maximum voltage is 100 V, what is the peak current in the circuit?
A. 2 A
B. 4 A
C. 1 A
D. 5 A
Question 12
A gas at 300 K and 1 atm expands to twice its original volume. What is the new pressure, assuming the gas is ideal?
A. 0.5 atm
B. 1 atm
C. 2 atm
D. 4 atm
Question 13
A wave of frequency $f$ and amplitude $A$ is traveling in the positive $x$-direction. The wave function is given by $y(x,t) = A \sin\( kx - \omega t \)$. What is the speed of the wave?
A. \frac{f}{k}
B. \frac{\omega}{k}
C. \frac{k}{f}
D. \frac{A}{f}
Question 14
A block of mass 5 kg is attached to a horizontal spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 15
A point charge of +2 μC is placed at the center of a spherical conductor of radius 0.1 m. What is the electric field at a point 0.2 m from the center of the sphere?
A. 4.0 x 10^3 N/C
B. 2.0 x 10^3 N/C
C. 1.0 x 10^3 N/C
D. 0.5 x 10^3 N/C

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