POST UTME EKSU 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A heat engine operates between the temperatures 300 K and 400 K. Find the efficiency of the engine.
A. 0.2
B. 0.3
C. 0.4
D. 0.5
Question 2
A particle of mass 2 kg is moving in a circular path of radius 3 m with a cons\tant speed of 4 m/s. If the particle is subjected to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 3
A convex lens of focal length 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. -1
C. -1.5
D. -2
Question 4
A particle of charge 2 μC is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. What is the magnitude of the magnetic field at the center of the circle?
A. 0.1 T
B. 0.2 T
C. 0.3 T
D. 0.4 T
Question 5
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. Determine the maximum height reached by the projectile.
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 6
A simple harmonic oscillator has a frequency of 5 Hz and an amplitude of 10 cm. If the oscillator is displaced from its equilibrium position by 5 cm, what is the acceleration at this position?
A. 0.25 m/s^2
B. 0.5 m/s^2
C. 1.0 m/s^2
D. 2.0 m/s^2
Question 7
A radioactive sample decays from 100 mg to 50 mg in 10 days. If the half-life of the sample is 20 days, determine the decay cons\tant.
A. 0.01 min^-1
B. 0.02 min^-1
C. 0.03 min^-1
D. 0.04 min^-1
Question 8
A photon of energy 2 eV is incident on a metal surface with a work function of 1 eV. Determine the maximum kinetic energy of the emitted electron.
A. 0.5 eV
B. 1 eV
C. 1.5 eV
D. 2 eV
Question 9
A particle moves in a circular path with a cons\tant speed of 5 m/s. If the radius of the circle is 2 m, what is the magnitude of the acceleration of the particle?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 10
A liquid of density 800 kg/m³ is in a U-tube of height 10 cm. Find the pressure at the bottom of the tube.
A. 8000 Pa
B. 10000 Pa
C. 12000 Pa
D. 14000 Pa
Question 11
A parallel beam of light of wavelength 500 nm is incident on a glass plate of re\fractive index 1.5. If the angle of incidence is 30°, determine the angle of re\fraction.
A. 20°
B. 30°
C. 40°
D. 50°
Question 12
A body of mass 5 kg is at rest on a frictionless surface. A force of 10 N is applied to it. Find the acceleration of the body.
A. 2 m/s²
B. 5 m/s²
C. 10 m/s²
D. 15 m/s²
Question 13
A force of 20 N acts on an object, cau\sing it to accelerate at 2 m/s^2. If the mass of the object is 5 kg, what is the net force acting on the object?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 14
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If the plates are separated by a dis\tance of 2 mm, what is the surface charge density?
A. 2.5 × 10^\( -3 \) C/m^2
B. 5.0 × 10^\( -3 \) C/m^2
C. 7.5 × 10^\( -3 \) C/m^2
D. 10^\( -2 \) C/m^2
Question 15
A gas is contained in a cylinder of volume 2 L at a pressure of 2 atm. If the temperature is increased by 10°C, what is the new pressure?
A. 2.5 atm
B. 3 atm
C. 3.5 atm
D. 4 atm

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