POST UTME NILE UNIVERSITY 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A radioactive sample has a half-life of 10 years. If the initial activity is 1000 Bq, what is the activity after 20 years?
A. 125 Bq
B. 250 Bq
C. 500 Bq
D. 1000 Bq
Question 2
A particle of mass $m$ is moving in a straight line with a velocity of $v$. If the particle is subjected to a force of $F$ for a time interval of $\Delta t$, what is the change in its momentum?
A. \Delta p = F\Delta t
B. \Delta p = \frac{F\Delta t}{m}
C. \Delta p = \frac{mv^2}{F}
D. \Delta p = \frac{F^2\Delta t}{m}
Question 3
A circuit consists of a resistor $R$, an inductor $L$, and a capacitor $C$ connected in series. If the frequency of the alternating current is $f$, what is the impedance of the circuit?
A. \sqrt{R^2 + \( \omega L - \frac{1}{\omega C} \)^2}
B. \sqrt{R^2 + \( \omega L + \frac{1}{\omega C} \)^2}
C. \sqrt{R^2 + \( \omega L - \frac{1}{\omega C} \)^2}
D. \sqrt{R^2 + \( \omega L + \frac{1}{\omega C} \)^2}
Question 4
A 10 µF capacitor is connected in series with a 20 µF capacitor and a 50 µF resistor. If a 100 V battery is connected across the circuit, what is the magnitude of the current flowing through the circuit?
A. 0.2 A
B. 0.4 A
C. 0.6 A
D. 0.8 A
Question 5
A radioactive sample decays from 100 g to 50 g in 10 years. What is the half-life of the sample?
A. 5 years
B. 10 years
C. 15 years
D. 20 years
Question 6
A magnetic field is produced by a current-carrying wire. If the current in the wire is increased by 50%, what is the new magnitude of the magnetic field?
A. 1.5 B
B. 2 B
C. 2.5 B
D. 3 B
Question 7
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. If a voltage of 15 V is applied across the circuit, what is the current through the 5 Ω resistor?
A. 0.3 A
B. 0.4 A
C. 0.5 A
D. 0.6 A
Question 8
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. The dielectric cons\tant of the material between the plates is 3. The capacitor is connected to a 12 V battery. Calculate the energy stored in the capacitor.
A. 9.36 × 10^-9 J
B. 1.88 × 10^-8 J
C. 2.88 × 10^-8 J
D. 3.88 × 10^-8 J
Question 9
A particle of mass 1 kg is moving in a straight line with a velocity of 5 m/s. What is the magnitude of the momentum of the particle?
A. 5 kg m/s
B. 10 kg m/s
C. 15 kg m/s
D. 20 kg m/s
Question 10
A wave has a frequency of 50 Hz and a wavelength of 0.2 m. What is the speed of the wave?
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 11
A gas is enclosed in a container with a movable piston. The gas is compressed from an initial volume of 2 m^3 to a final volume of 1 m^3 at cons\tant temperature. What is the ratio of the final pressure to the initial pressure?
A. 2
B. 4
C. 8
D. 16
Question 12
A current of 2 A flows through a resistor of 4 Ω. Calculate the power dissipated in the resistor.
A. 16 W
B. 32 W
C. 64 W
D. 128 W
Question 13
A gas at a pressure of 2 atm and a temperature of 300 K is heated to a temperature of 400 K. What is the final pressure of the gas?
A. 1 atm
B. 2 atm
C. 3 atm
D. 4 atm
Question 14
A capacitor of capaci\tance 2 × 10^-6 F is connected to a 12 V battery. Calculate the charge on the capacitor.
A. 24 μC
B. 48 μC
C. 72 μC
D. 96 μC
Question 15
A gas is contained in a cylinder with a movable piston. If the pressure of the gas is increased by 20% and the volume is decreased by 15%, what is the new temperature of the gas?
A. 10°C
B. 20°C
C. 30°C
D. 40°C

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