POST UTME AFE BABALOLA UNIVERSITY 2024 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A radioactive sample emits \alpha particles with a half-life of 3.8 days. If the initial activity is 120 Bq, calculate the activity after 10 days.
A. 40 Bq
B. 60 Bq
C. 80 Bq
D. 120 Bq
Question 2
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle has a speed of 4 m/s, what is the centripetal acceleration?
A. 1 m/s²
B. 2 m/s²
C. 3 m/s²
D. 4 m/s²
Question 3
A 5.0 L flask contains 2.0 mol of an ideal gas at 300 K. What is the pressure of the gas?
A. 1.0 atm
B. 2.0 atm
C. 3.0 atm
D. 4.0 atm
Question 4
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 5 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?
A. 5 μF
B. 10 μF
C. 20 μF
D. 40 μF
Question 5
A current of 2 A flows through a resistor of 10 Ω. If the voltage across the resistor is 20 V, what is the power dissipated in the resistor?
A. 40 W
B. 50 W
C. 60 W
D. 80 W
Question 6
A current $I$ flows through a wire of resis\tance $R$. The power dissipated in the wire is given by $P = I^2R$. If the current is doubled, what is the new power dissipated?
A. 2P
B. 4P
C. P
D. \frac{1}{2}P
Question 7
A 100 V, 50 Hz AC supply is connected across a resistor of 10 Ω. What is the rms value of the current flowing through the resistor?
A. 2 A
B. 5 A
C. 10 A
D. 20 A
Question 8
A block of mass 5 kg is placed on a frictionless surface and attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position and released, what is its maximum velocity?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 9
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle's angular velocity is 4 rad/s, what is its linear velocity?
A. 10 m/s
B. 12 m/s
C. 15 m/s
D. 20 m/s
Question 10
A beam of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.
A. 20°
B. 25°
C. 30°
D. 35°
Question 11
A capacitor of capaci\tance 10 μF is connected in series with a resistor of resis\tance 20 Ω. If a voltage of 50 V is applied across the circuit, what is the current flowing through the circuit?
A. 0.5 A
B. 1 A
C. 2 A
D. 5 A
Question 12
A beam of light passes through a prism and is re\fracted. If 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 13
A particle of mass $m$ is moving in a circular orbit of radius $r$ under the influence of a central force given by $F = k \frac{1}{r^2}$, where $k$ is a cons\tant. If the particle's speed is $v$, what is the total energy of the particle?
A. 0
B. -\frac{1}{2}mv^2
C. \frac{1}{2}mv^2
D. -\frac{k}{r}
Question 14
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. Find the focal length of the combination.
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
Question 15
A thermodynamic system undergoes a process from state A to state B, where the initial temperature is 300 K and the final temperature is 400 K. If the heat capacity at cons\tant volume is 20 J/K and the heat capacity at cons\tant pressure is 30 J/K, what is the change in internal energy?
A. 10,000 J
B. 20,000 J
C. 30,000 J
D. 40,000 J

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