WAEC SSCE - Physics - 2018 (Objective)

In a series R-L-C circuit, R = 10\(\Omega\), \(X_{c}\)= 4\(\Omega\) and \(X_{L}\) = 9\(\Omega\). The impedance of the circuit is

Which of the following is emitted in a process of natural radioactivity?

During a training session, two footballers pass a ball repeatedly between each other. The 'to and fro' motion of the ball is not simple harmonic because the

I. Acceleration of the ball is not directed towards a fixed point

II. Restoring force is not directed towards the centre

III. Acceleration of the ball is not directly proportional to the displacement from a fixed point

Which of the statements above are correct?

In which of the following situations is photoelectric effect employed?

I. Automatic devices for switching on light at dusk

II. Automatic doors in departmental stores

III. Automatic devices for switching on air conditioners

IV. Automatic voltage stabilizers

The S.I unit for sound energy is

A nuclide is represented by \(_{32}^{70}B\). Determine its neutron-proton ratio

A dam is able to hold a large quantity of water because its wall is

The diagram above illustrates the wire connections to a three-pin plug. The wires P, Q and R respectively are:

According to Newton's law of cooling, the heat energy lost per unit area of a body depends on the

I. Surface area

II. Nature of the surface

III. Temperature of the surface

IV. Excess temperature over the surroundings

A body is projected with an initial velocity u at angle \(\theta\) to the horizontal. If \(R_{max}\) is the maximum range of the projectile, what does the relation \(\frac{u^{2}}{R_{max}}\) represent?

A body of mass m moving around a circle of radius r with a uniform speed v experiences a centripetal force F. The work done by the centripetal force on it is

A block is acted upon by TWO horizontal forces as illustrated in the diagram above. The block accelerates at 1.5\(ms^{-2}\). Calculate the mass of the block.

Which electrical device is illustrated above?

The general definition of elastic modulus is

A simple barometer is constructed using a liquid \(Q_{1}\) of density 16.2\(g/cm^{3}\). Calculate the least lenth of the tube to be used to measure pressure of 1.5atm.  [Density of mercury = 13.6\(g/cm^{3}\), 1atm = 76.0 cm of Mercury]

Rainbow formation is a natural phenomenon illustrating that white light

Which of the following statements is not an advantage of an alkaline accumulator?

The primary of a transformer has 100 turns and its secondary has 200 turns. If the voltage at the primary is 100V, determine the voltage at the secondary.

The diagram above illustrates the mercury-in-glass thermometer used for determining the temperature of a room. Use the data on it to determine the room temperature. 

An object at rest is said to possess 

The graph of density against temperature for water is correctly illustrated by

A bar AB is balanced horizontally on two knife edges as illustrated as in the diagram above. Determine the weight of the bar.

The pitch of a note is not affected by

Frequency is measured in

To obtain a virtual, erect and magnified image from a thin converging lens, an object must be placed 

The bob of a simple pendulum takes 8.0s to complete 10 oscillations. Determine the frequency of oscillation of the bob.

Two objects P and Q of masses 100kg and 20kg respectively are 1.2m apart on a horizontal surface. Calculate the net gravitational force acting on Q. \([G= 6.67 \times 10^{-11} Nm^{2}kg^{-2}]\)

The diagram above represents a transverse travelling wave. Which two points are 180° out of phase?

Which of the following quantities are dimensionally independent?

I. Dielectric constant    II. Momentum   III. Efficiency   IV. Refractive index

When the speed of a car is halved, its kinetic energy is

Which of the following factors does not increase the rate of evaporation of water in a lake?

The lens illustrated above can best be described as a

A football is kicked at an angle of 45° to the horizontal over a defense line up with a velocity of 15\(ms^{-1}\). Calculate the magnitudeof horizontal velocity of the ball at its highest point  [Neglect friction, g = 10\(ms^{-2}\)].

Which of the following statements about parallel plate capacitors is/are correct?

I. Capacitance of the capacitor  is inversely proportional to the distance between the plates

II. Capacitors can filter a.c signals from d.c 

III. Capacitors can store charges

Which of the following electromagnetic waves is most energetic? 

The diagram above illustrates a waveform. Determine the number of wavelengths in it

A student uses two compass needles to investigate the magnetic field around a bar magnet. Which of the following diagrams show the correct directions of the needles?

The circuit contains three ammeters A1, A2 and A3 with readings of A2 and A3 shown as indicated in the diagram. Determine the reading of A1.

Two plane mirrors are inclined to each other such that an object placed between them has 11 images. Determine the angle of inclination 

In the diagram illustrated a block of mass M is at rest on a plane inclined at an angle \(\theta\) to the horizontal. As \(\theta\) increases, the velocity ratio of the plane

The ice point on the absolute scale of temperature is

When two flat plate conductors are arranged in such a way that they possess equal and opposite charges seperated by a dielectric, they form a/an

Which of the following radiations has the longest wavelength?

A resistor with fixed resistance value is called a

Which of the following statements about magnetic lines of force is not correct? They

In which of the following fields is radioisotopes not used?

The property of a body to remain at rest or to continue in uniform motion in a straight line is called

A wire of length 400cm is stretched between two fixed points. When plucked, its fundamental frequency is 150Hz. Calculate the speed of the wave produced.

In which of the following activities is an induction coil not useful?

The diagram above illustrates a simple barometer. Which distance measures the atmospheric pressure?