POST UTME COAL CITY UNIVERSITY 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A magnetic field is produced by a current-carrying wire. If the current is 2 A and the wire is 0.5 m long, what is the magnetic field strength?
A. 0.02 T
B. 0.04 T
C. 0.06 T
D. 0.08 T
Question 2
A car is traveling at a speed of 60 km/h. What is its acceleration if it takes 10 seconds to cover a dis\tance of 50 m?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 3
A capacitor consists of two parallel plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the plates are charged to a potential difference of 10 V, what is the capaci\tance of the capacitor?
A. 0.01 F
B. 0.1 F
C. 1 F
D. 10 F
Question 4
A block of mass 5 kg is placed on a frictionless surface and a horizontal force of 20 N is applied to it. If the block starts from rest and moves with a cons\tant acceleration of 4 m/s^2, what is the work done on the block?
A. 80 J
B. 160 J
C. 240 J
D. 320 J
Question 5
A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 100 V is applied across the plates, calculate the charge stored on the capacitor.
A. 0.1 C
B. 0.2 C
C. 0.3 C
D. 0.4 C
Question 6
A 10 Ω resistor, a 20 μF capacitor, and a 50 mH inductor are connected in series across a 120 V AC source. If the frequency of the source is 50 Hz, calculate the impedance of the circuit.
A. 15 Ω
B. 20 Ω
C. 25 Ω
D. 30 Ω
Question 7
A radioactive sample has a half-life of 5 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 8
A charged particle moves through a uniform magnetic field. If the particle's velocity is perp\endicular to the magnetic field, what is the direction of the force exerted on the particle?
A. towards the magnetic field
B. away from the magnetic field
C. perp\endicular to the magnetic field
D. along the magnetic field
Question 9
A block of mass 4 kg is placed on a frictionless surface and attached to a horizontal spring with a force cons\tant of 150 N/m. The block is displaced by 0.4 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the angular frequency of the block.
A. 2 rad/s
B. 4 rad/s
C. 6 rad/s
D. 8 rad/s
Question 10
A circuit consists of a 12 V battery, a 4 ohm resistor, and a 6 ohm resistor connected in series. If the current in the circuit is 2 A, what is the power dissipated in the 6 ohm resistor?
A. 12 W
B. 24 W
C. 36 W
D. 48 W
Question 11
A body is in equilibrium under the action of three forces. If the magnitude of two forces is 10 N and the magnitude of the third force is 20 N, what is the angle between the two forces?
A. 30°
B. 45°
C. 60°
D. 75°
Question 12
A 100 W bulb is connected to a 220 V AC source. If the bulb is rated for 5 A, calculate the power factor of the bulb.
A. 0.5
B. 0.6
C. 0.7
D. 0.8
Question 13
A ray of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 25°
C. 30°
D. 35°
Question 14
A 2 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 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. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 15
A circuit consists of a resistor, an inductor, and a capacitor connected in series. If the frequency of the AC source is increased, what happens to the impedance of the circuit?
A. decreases
B. increases
C. remains the same
D. becomes zero

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