OAU Physics 2017/2018 Past Questions

Two forces A and B act on an object. The angle between the forces is 60°. The magnitude of A is 15N while the resultant of the two vectors has a magnitude of 18N. What is the magnitude of vector B?

Two forces of magnitudes 80N and 60N act on a 5kg object. If the angle between the two forces is 120° the acceleration of the body is

A man travelled 3km due east in 4 mins by bus on a straight road, and then drove a car 4km due north in 3 mins. Calculate his average velocity.

Force of the same magnitude is applied to each of 1kg of lead (Pb), 1kg of iron (Fe) and 1kg of paper. Which of the three masses has the highest acceleration?

A 10.0kg mass is dragged along a horizontal table by a 60N force.The force is inclined at angle 30° to the horizontal, and the coefficient of dynamic friction between the mass and the table is 0.15. Calculate the acceleration of the mass. Take g = 10m/s²

A body of mass 8.0kg is connected to a body of mass 5.0kg with an inextensible string passing over a frictionless pulley as shown in Fig. 1. Calculate the force of friction between the 5.0kg mass and the horizontal table if the 8.0kg mass accelerated downwards at 4.5m/s² [g = 10m/s²

A body of mass M kg is located 0.5m from a body of mass 2 M kg. At the same time it is 0.75m from a third body of mass 3 M kg and 0.9m from a fourth body of mass 5M kg. Which of the three bodies exerts the least gravitational force of attraction on the body of mass M kg?

Which of the following statements is true of a body moving with simple harmonic oscillation about its equilibrium position?

A body of mass 1.5kg is fastened to a spring, and lies on a horizontal frictionless table. When the mass is pulled with a force of 32N, the extension in the spring is 0.35m. Calculate the maximum kinetic energy for a simple harmonic oscillation when the initial displacement is 0.2m.

The linear coefficient of expansion of aluminium is 23 x 10^-60C^-1, and that of iron is 11 x 10^-60C^^-1. The length of an aluminium rod is 0.24 times the length of an iron rod when both are at 0°C. The temperature of the aluminium rod is increased to 60°C while that of the iron rod is increased to 45°C. Calculate the ratio of the increase in length of the aluminium rod to that of the iron rod.

In a thermo-flask, cork is placed between the evacuated inner cylinder and the outer jacket to reduce heat loss or gain due to process.

The process of ejecting electrons from a body by heating it is referred to as

Which of the following bodies will lose its heat at the fastest rate? The bodies have the same surface area and initial temperature.

An object is 5cm away from the pole of a convex lens whose radius of curvature is 30cm. What is the nature of the object's image?

When white light passes through a glass prism, the colours of light coming out arranged in the order of decreasing angle of deviation are

A man standing at some distance from a sharp cliff, hears the echo of his clap 1.2 seconds after he claps. How far from the cliff is the man? The speed of sound in air is 340m/s

Both proton and electron carry charges whose magnitude equals 1.6 x 10^-19. Calculate the electrostatic potential between the electron and the proton in a hydrogen atom when the separation between them is 0.5 x 10^-10m. [[INSERT EQUATION] = 8.85 x 10^-12N.m²/C²]

A uniform magnetic field lies in the positive x - direction. An electron moving in the negative y - direction enters the region of the magnetic field. Which of the following statements is true about the direction of motion of the electron?

Calculate the effective resistance between terminals A and B in the circuit section shown in Fig. 2.

Calculate the equivalent capacitance between terminals A and B in the circuit section shown in Fig. 3

A broadcasting station transmits at a frequency of 89.5MHz. What capacitance together with an inductance of 3µH is needed to tune to this station?

When ²³⁸₉₂U decays by emitting an alpha particle, the daughter nuclide is .............