FUNAAB Physics 2019/2020 Past Questions

A device that converts mechanical energy into electrical energy is

In the wiring of houses, the fuse is connected to the wire coloured

A 15µF capacitor is connected to a 240V, 50Hz a.c source. Calculate the reactance of the capacitor. [π = 3.142]

In a school compound, a girl walks 40m due east from the laboratory to the staff room to submit her report. Then she returns and walks 30m due north to her classroom. Determine the magnitude of her displacement from the laboratory.

A bullet fired vertically upwards reaches a height of 500m. Neglecting air resistance, calculate the magnitude of the initial velocity of the bullet [g = 10ms^-2]

Two strings each inclined at an angle of 30° to the horizontal are used to hold a bucket of water 20N. Calculate the tension in each string.

The pressure applied to an enclosed fluid to one and is transmitted equally throughout the fluid and to the container walls. This statement is

An electric heater with a p.d of 240V connected across its terminals has a total resistance of 960Ω. Find the power rating of the heater.

A cell of internal resistance r is connected to an external resistor R. The condition for maximum power transfer is

A moving body of mass 25.0kg undergoes a uniform retardation of 20.0ms^-2. Calculate the magnitude of the retarding force.

The coefficient of friction between two perfctly smooth surface is

A cell of emf 1.5V is connected in series with a 10Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell.

Capacitors are used in the induction coil to

A thermometer records 680mmHg at steam point and 440 mmHg at ice point. The temperature it records at 380mmHg is

The pressure P, volume V and absolute temperature T of a given mass of an ideal gas change simultaneously. Which of the following equations is correct about the gas?

To convert a galvanometer to a voltmeter, a

A wheel and axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is

A train has an initial velocity of 44m/s and an acceleration of -4m/s². Its velocity after 10s is

A simple pendulum with a period of 2.0s has its length doubled. Its new period is

Two identical waves travelling in the same direction are superimposed. What shoulf be the phase difference between the waves for maximum destructive interference to occur?

The pitch of a note is not affected by

When an air coloumn is set into vibrations, the distance between two consecutive nodes of the resultant wave is

A simple harmonic oscillator has a period of 0.02s and amplitude of 0.25m. Calculate the speed on ms^-1 at the centre of the oscillation

An object is projected with a velocity of 100m/s from the ground level at an angle to the vertical. Total time of flight of the projectile is 10s, calculate the angle of projection (g = 10m/s²)

In electrolysis experiments, a cathode of mass 5g is found to weigh 5.01g after a current of 5A flows for 50 seconds. What is the electrochemical equivalent of the deposited substance?

A copper wire 20m long is heated from 20°C to 70°C. If the linear expansivity of copper is 1.7 × 10^-5, calculate the increase in length.

Which of the following colours of surfaces will radiate heat energy best?

Which of the following relationship between superficial and cubical expansivities is correct?

The power dissipated in an A.C circuit with an r.m.s current of 5A, r.m.s voltage of 10V and a phase angle of 60° is

A wire of length 15m made of a material of resistivity 1.8 × 10^-6ohm-m has a resistance of 0.27 ohms. The area of the wire is

A bat emits sound at a speed of 1650m/s and receives the echoes 0.15s later. Calculate the distance of the bat from the reflector

A thin converging lens has a power of 4.0 dioptres. Determine its focal length

An optical pin is placed 10.0cm from the pole of a convex mirror of focal length 15.0cm. What is the magnification of the image produced?

Which of the following is true for the image formed by a convex mirror?
I. The image is always virtual II. The image is always erect III. The image is never magnified IV. The focal length is negative

A solid of mass 0.5kg initially at 50°C melts at 60°C. Calculate the quantity of heat required to melt it completely. [Specific heat capacity of the solid = 2.0 kJkg^-1K^-1, Specific latent heat of fusion of solid = 1.0 kJkg^-1]

Which of the following properties of a long steel bar would alter if the bar were melted, recast into a cube and allowed to cool to its original temperature?

The current in a reverse-biased junction is due to

The main function of a transformer in an a.c radio set is to

An electron moves with a speed of 2.0 × 10⁸ms^-1 in a straight line. Calculate the wavelength of the electron wave. [mass of an electron = 9.1 × 10^-31Kg, Planck's constant = 6.6 × 10^-34]

In an a.c circuit that contains only a capacitor, the voltage lags behind the current by

If two inductors of inductance 3H and 6H are arranged in series, the total inductance is

What is the number of neutrons in the uranium isotope, ²³⁸₉₂U?

The amount of energy released when 0.5kg of uranium is burnt completely is [c = 3 × 10⁸ms^-1]

What part of the camera corresponds to the iris of the eye?

The half-life of a certain radioactive nuclide is 9 hours. If the original mass of the nuclide is 28kg, determine the mass left after 1¹⁄₂ days

When a certain a.c suppply is connected to a lamp, it lights with the same brightness as it does with a 12V d.c battery. The r.m.s value of the a.c supply is

A silicon material doped with an element of a certain group and an n-type semi-conductor is formed. The most likely group of the element is

A magnetic needle is suspended first at earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are:

One of the properties of gamma rays is that they are

If the decay constant of a radioactive substance is 0.231/s, the half-life is