POST UTME ELIZADE UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A thermodynamic system undergoes a process from state A to state B. The initial temperature is 300 K and the final temperature is 400 K. If the change in entropy is 50 J/K, calculate the heat absorbed by the system.
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 2
A particle of mass 1 kg is moving in a circular path of radius 1 m with a cons\tant speed of 3 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. 3 N
B. 6 N
C. 9 N
D. 12 N
Question 3
A particle of mass 1 u and charge +e is moving in a circular path of radius 1 m in a magnetic field of strength 1 T. What is the speed of the particle?
A. 1 m/s
B. 10 m/s
C. 100 m/s
D. 1000 m/s
Question 4
A block of mass 5 kg is attached to a horizontal spring with a spring cons\tant of 200 N/m. If 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. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 5
A beam of light is incident on a surface at an angle of incidence i. What is the angle of reflection?
A. i
B. \frac{i}{2}
C. 2i
D. \sqrt{i}
Question 6
A radioactive sample has an initial activity of 100 Bq. If the sample decays with a half-life of 10 minutes, what is the activity of the sample after 20 minutes?
A. 50 Bq
B. 25 Bq
C. 12.5 Bq
D. 6.25 Bq
Question 7
A vector has a magnitude of 5 units and makes an angle of 30° with the positive x-axis. If the vector is rotated by 60° in the counterclockwise direction, what is its new magnitude?
A. 5.12 units
B. 5.66 units
C. 6.08 units
D. 6.50 units
Question 8
A particle of mass $m$ is moving in a circular path of radius $R$ with a cons\tant speed $v$. The particle experiences a centripetal force $F_c$ given by $F_c = \frac{mv^2}{R}$. If the particle's speed is doubled to $2v$, what is the new centripetal force $F_{c,new}$?
A. 4mv^2/R
B. 2mv^2/R
C. mv^2/R
D. m(2v)^2/R
Question 9
A nucleus of mass number 240 and atomic number 94 undergoes \beta decay. What is the resulting nucleus?
A. Th-240
B. U-240
C. Pa-240
D. Np-240
Question 10
A parallel plate capacitor has plates of area 0.04 m^2 and separation 3 mm. If the capaci\tance is 2.5 nF, what is the charge on the plates when a potential difference of 10 V is applied?
A. 0.025 C
B. 0.05 C
C. 0.1 C
D. 0.2 C
Question 11
A light ray passes through a prism of angle A and is re\fracted at an angle B. What is the angle of deviation?
A. A - B
B. A + B
C. A \cdot B
D. \frac{A}{B}
Question 12
A wave has a frequency of 50 Hz and a wavelength of 2 m. If the wave is traveling in the positive x-direction, what is the direction of the wave's velocity?
A. Positive x-direction
B. Negative x-direction
C. Positive y-direction
D. Negative y-direction
Question 13
A particle of mass 2.5 kg is moving in a circular path of radius 4.0 m with a cons\tant speed of 12.0 m/s. If the particle experiences a centripetal acceleration of 3.0 m/s^2, what is the magnitude of the net force acting on the particle?
A. 10.0 N
B. 20.0 N
C. 30.0 N
D. 40.0 N
Question 14
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If air resis\tance is neglected, what is the maximum height reached by the projectile?
A. 10.2 m
B. 15.3 m
C. 20.4 m
D. 25.5 m
Question 15
A 100 W light bulb is connected to a 220 V power source. What is the current drawn by the bulb?
A. 0.25 A
B. 0.50 A
C. 0.75 A
D. 1.00 A

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