POST UTME CRAWFORD UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A wave has a frequency of 50 Hz and a wavelength of 10 m. What is the speed of the wave?
A. 500 m/s
B. 1000 m/s
C. 1500 m/s
D. 2000 m/s
Question 2
A car travels from point A to point B with an average speed of 60 km/h. If the dis\tance between the two points is 240 km, what is the time taken for the journey?
A. 4 h
B. 6 h
C. 8 h
D. 10 h
Question 3
A vector µ has a magnitude of 5 m and makes an angle of 30° with the positive x-axis. If a vector ¶ has a magnitude of 3 m and makes an angle of 60° with the positive x-axis, what is the magnitude of the resul\tant vector µ + ¶?
A. 4 m
B. 5 m
C. 6 m
D. 7 m
Question 4
A 5 m long wire has a resis\tance of 2 Ω. If a current of 10 A flows through the wire, calculate the power dissipated by the wire.
A. 200 W
B. 400 W
C. 600 W
D. 800 W
Question 5
A parallel circuit consists of two resistors with resis\tances of 10 Ω and 20 Ω. If a potential difference of 30 V is applied across the circuit, calculate the current flowing through the 10 Ω resistor.
A. 3 A
B. 4 A
C. 5 A
D. 6 A
Question 6
A radioactive sample decays with a half-life of $3.0 , \text{days}$. If the initial activity is $100 , \text{Bq}$, calculate the activity after $10 , \text{days}$.
A. $50 \, \text{Bq}$
B. $75 \, \text{Bq}$
C. $100 \, \text{Bq}$
D. $125 \, \text{Bq}$
Question 7
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 8
A 10 Ω resistor is connected in parallel with a 20 Ω resistor. If a 12 V DC source is applied across the circuit, what is the magnitude of the current flowing through the 10 Ω resistor?
A. 0.6 A
B. 0.8 A
C. 1.2 A
D. 1.5 A
Question 9
A $50 , Omega$ resistor is connected in parallel with a $20 , Omega$ resistor. Calculate the equivalent resis\tance of the circuit.
A. $20 \, \Omega$
B. $30 \, \Omega$
C. $40 \, \Omega$
D. $50 \, \Omega$
Question 10
A 2.0 kg object is moving in a circular path with a radius of 1.5 m. If the object has a speed of 4.0 m/s, determine the centripetal acceleration of the object.
A. 2.0 m/s^2
B. 4.0 m/s^2
C. 6.0 m/s^2
D. 8.0 m/s^2
Question 11
A 5 μF capacitor is connected in series with a 10 kΩ resistor. If a 12 V DC source is applied across the circuit, what is the magnitude of the current flowing through the resistor?
A. 0.6 mA
B. 0.8 mA
C. 1.2 mA
D. 1.5 mA
Question 12
A 100 W light bulb is connected to a 230 V AC power source. If the bulb is rated for 0.5 A, what is the power factor of the circuit?
A. 0.5
B. 0.6
C. 0.7
D. 0.8
Question 13
A radioactive sample has a half-life of 5 years. If the initial activity of the sample is 100 Bq, what is the activity of the sample after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 14
A 2 kg block of copper is heated from 20°C to 80°C. If the specific heat capacity of copper is 0.385 J/g°C, calculate the energy required to heat the block.
A. 800 J
B. 1600 J
C. 2400 J
D. 3200 J
Question 15
A 10.0 g sample of a radioactive subs\tance decays to 5.0 g in 10 days. Determine the half-life of the subs\tance.
A. 5.0 days
B. 10.0 days
C. 15.0 days
D. 20.0 days

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