POST UTME CRAWFORD UNIVERSITY 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A parallel plate capacitor has plates of area 0.1 m^2 and separation 0.01 m. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance.
A. 10 nF
B. 20 nF
C. 30 nF
D. 40 nF
Question 2
A 100 W bulb is connected to a 220 V mains supply. What is the resis\tance of the bulb?
A. 10 Ω
B. 20 Ω
C. 30 Ω
D. 40 Ω
Question 3
A nucleus of mass number 238 has an atomic number of 92. What is the number of protons and neutrons in the nucleus?
A. 92 protons, 146 neutrons
B. 146 protons, 92 neutrons
C. 92 protons, 146 neutrons
D. 146 protons, 92 neutrons
Question 4
A light ray 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. 30°
C. 40°
D. 50°
Question 5
A radioactive sample of Δₗ emits Δₗα particles with a half-life of 5.3 days. If the initial activity is 1.0 Ci, what is the activity after 10 days?
A. 0.25 Ci
B. 0.5 Ci
C. 0.75 Ci
D. 1.0 Ci
Question 6
A 500 Hz AC voltage source is connected to a 20 Ω resistor in series with a 5 μF capacitor. The circuit is driven by a \sinusoidal voltage source with a peak value of 5 V. What is the magnitude of the current in the circuit at 50 Hz?
A. 0.1 A
B. 0.2 A
C. 0.5 A
D. 1.0 A
Question 7
A gas at 300 K and 1.0 atm is compressed to 2.0 atm. What is the final temperature?
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 8
A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm from the lens. What is the magnification of the image?
A. -0.5
B. -1
C. -1.5
D. -2
Question 9
A particle of mass 1.0 kg is confined to a one-dimensional box of length 0.10 m. What is the energy of the ground state?
A. 1.0 x 10¹ J
B. 2.0 x 10¹ J
C. 3.0 x 10¹ J
D. 4.0 x 10¹ J
Question 10
A particle of mass 2 kg is moving in a circular path of radius 3 m with a cons\tant speed of 4 m/s. If the magnetic field strength is 2 T, what is the magnitude of the magnetic force acting on the particle?
A. 8 N
B. 12 N
C. 16 N
D. 20 N
Question 11
A 1000 W heater is connected to a 230 V AC supply. What is the current drawn by the heater?
A. 0.5 A
B. 1.0 A
C. 2.0 A
D. 4.0 A
Question 12
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the total resis\tance of the circuit?
A. 10 Ω
B. 12 Ω
C. 14 Ω
D. 16 Ω
Question 13
A light wave with a frequency of 5.0 x 10¹ Hz and a wavelength of 600 nm is incident on a double-slit apparatus. What is the dis\tance between the central maximum and the first minimum?
A. 0.20 mm
B. 0.30 mm
C. 0.40 mm
D. 0.50 mm
Question 14
A liquid of density 1000 kg/m^3 is flowing through a horizontal pipe of radius 0.05 m. If the pressure difference between the two \ends of the pipe is 1000 Pa, what is the velocity of the liquid?
A. 0.5 m/s
B. 1 m/s
C. 2 m/s
D. 5 m/s
Question 15
A 2.0 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.10 m from its equilibrium position and released from rest. What is the speed of the block when it passes through its equilibrium position?
A. 1.0 m/s
B. 2.0 m/s
C. 3.0 m/s
D. 4.0 m/s

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