POST UTME UI 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A magnetic field of 0.5 T is applied to a current-carrying wire of length 0.2 m. If the current is 2 A, calculate the force on the wire.
A. 0.1 N
B. 0.2 N
C. 0.3 N
D. 0.4 N
Question 2
A nucleus of mass number 238 and atomic number 92 undergoes \alpha decay. What is the mass number of the daughter nucleus?
A. 234
B. 236
C. 238
D. 240
Question 3
A photon of wavelength 400 nm is incident on a metal surface. If the work function of the metal is 2.5 eV, what is the maximum kinetic energy of the emitted electron?
A. 1.5 eV
B. 2.5 eV
C. 3.5 eV
D. 4.5 eV
Question 4
A block of mass 5 kg is moving with a velocity of 10 m/s on a frictionless surface. It collides with a stationary block of mass 10 kg. What is the velocity of the system after the collision?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 5
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. -1
B. -2
C. -3
D. -4
Question 6
A radioactive sample of uranium-238 decays into thorium-234 with a half-life of 4.5 billion years. If the initial amount of uranium-238 is 100 g, what is the amount of thorium-234 produced after 9 billion years?
A. 50 g
B. 75 g
C. 100 g
D. 125 g
Question 7
A 10 μF capacitor is connected in parallel with a 20 μF capacitor. What is the equivalent capaci\tance?
A. 10 μF
B. 20 μF
C. 30 μF
D. 40 μF
Question 8
A liquid with a density of 1000 kg/m^3 is flowing through a pipe with a radius of 0.1 m. If the pressure difference between the two \ends of the pipe is 1000 Pa, what is the velocity of the liquid?
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 9
A block of mass 0.5 kg is attached to a spring with spring cons\tant 100 N/m. If the block is displaced by 0.1 m from its equilibrium position, calculate the potential energy stored in the spring.
A. 0.5 J
B. 1 J
C. 1.5 J
D. 2 J
Question 10
A parallel plate capacitor with plate area A and separation d is charged to a potential V. If the separation is doubled to 2d, what is the new potential V'?
A. 1/2
B. 1
C. 2
D. 4
Question 11
A radioactive sample decays at a rate of 0.05% per hour. If the initial activity is 1000 Bq, calculate the activity after 2 hours.
A. 900 Bq
B. 950 Bq
C. 1000 Bq
D. 1050 Bq
Question 12
A block of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, what is the acceleration of the block?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 13
A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 5 m/s. If the particle is subjected to a centripetal acceleration of 1 m/s^2, what is the magnitude of the force acting on the particle?
A. 2 N
B. 4 N
C. 6 N
D. 8 N
Question 14
A particle of charge 2 μC is moving in a circular path of radius 0.1 m with a speed of 10 m/s. What is the magnitude of the electric field required to produce this motion?
A. 0.01 N/C
B. 0.05 N/C
C. 0.1 N/C
D. 0.5 N/C
Question 15
A wire of length 2 m and cross-sectional area 0.1 cm^2 is stretched by a force of 100 N. What is the strain on the wire?
A. 0.1
B. 0.2
C. 0.3
D. 0.4

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