2019 Physics WAEC Objective Past Questions
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The time rate of increase in velocity is calledCorrectIncorrect
Which of the following quantities is a vector?CorrectIncorrect
In an elastic collision, momentum is conserved as well asCorrectIncorrect
The induced current in a coil always flows in a direction so as to oppose the change that causes it. This statement is known asCorrectIncorrect
Which of the following instruments can be used to compare the magnitudes of charges on two given bodies?CorrectIncorrect
A body of mass 2 kg is released from a point 100m above the ground. Calculate its kinetic energy 80m from the point of release.CorrectIncorrect
Which of the following waves is not mechanical?CorrectIncorrect
A loaded spring is set in simple harmonic motion. The force that tends to restore the load to its equilibrium position isCorrectIncorrect
Which of the following cases cannot produce total internal reflection? A light ray travelling fromCorrectIncorrect
The vacuum in a thermoflask reduces heat loss resulting fromCorrectIncorrect
The diagram above represents an experimental set-up for verifyingCorrectIncorrect
Which of the following statements about a moving object is correct?CorrectIncorrect
If the efficiency of a transformer is 100%, which of the following equations would be correct?CorrectIncorrect
A freshly demagnetized bar magnet is placed in the East-West direction to ensure thatCorrectIncorrect
Which of the following graphs of a charge Q against potential difference V across capacitor is correct?CorrectIncorrect
A small amount of air is introduced into the vacuum above the mercury in a mercury barometer tube. The mercury level goes down because the air moleculesCorrectIncorrect
Calculate the quantity of heat needed to change the temperature of 60g of ice at 0°C to 80°C.
Specific latent heat f fusion of ice = 3.36 x 105kg-1
Specific heat capacity of water = 4.2 × 103kg-1k-1CorrectIncorrect
The wire of a platinum resistance thermometer has a resistance of 3.5Ω at 0°C and 10.5 Ω at 100°C. Calculate the temperature of the wire when its resistance is 7.5ΩCorrectIncorrect
A transverse pulse of frequency 9 Hz travels 4.5m in 0.6s. Calculate the wavelength of the pulse.CorrectIncorrect
In which of the following media is speed of sound the least?CorrectIncorrect
Which of the following characteristics of waves can a ripple tank be used to demonstrate?
Which of the following graphs gives the correct relationship between energy and mass when mass is converted to energy?CorrectIncorrect
An 800kg car moving at 80 kmhr-1 collides with a 1200kg car moving at 40kmhr-1 in the same direction. If the cars stick together, calculate their common velocity.CorrectIncorrect
The mass of a load is doubled while the force acting on it is halved. The resulting acceleration of the load isCorrectIncorrect
The maximum and minimum thermometer reads theCorrectIncorrect
An a.c. generator can be converted to a d.c. generator by replacing theCorrectIncorrect
Which of the following statements is the correct reason for using soft iron in making the armature of an electric bell?CorrectIncorrect
The diagram above illustrates a meter bridge circuit under balanced conditions. Determine the value of x.CorrectIncorrect
Which of the following devices is used for storing electric charges?CorrectIncorrect
A capacitor is a device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator.
An electron of mass 9.1 × 10-31 kg moves with a speed of 2.0 × 106 ms-1.round the nucleus of an atom in a circular path of radius 6.1 × 10-11m.
Use the information to answer this question.
Determine the angular speed of the electron.CorrectIncorrect
An electron of mass 9.1 × 10-31 kg moves with a speed of2.0 × 106 ms-1 around the nucleus of an atom in a circular path of radius 6.1 × 10-11m
Use the information to answer this question.
Calculate the centripetal force acting on the electron.CorrectIncorrect
A device consumes 100W of power when connected to a 120V source. Calculate its resistance.CorrectIncorrect
Which property of a wave remains constant when the wave travels from one medium into another?CorrectIncorrect
The anomalous expansion of water occurs in the rangeCorrectIncorrect
A ray of light travelling from a rectangular glass block of refractive index 1.5 into air strikes the block at an angle of incidence of 30°. Calculate its angle of refraction.CorrectIncorrect
A rectangular piece of iron measuring 4cm by 3cm at 20°C is heated until its temperature increases by 100°C. Calculate the new area of the metal.
[Linear expansivity of iron is 1.2 x 10-5K-1]CorrectIncorrect
Two bodies of masses 3.0kg and 2.0kg are separated by a distance of 50cm. Calculate the force of attraction between them.
[G = 6.67 x 10-11 Nm2kg-2]CorrectIncorrect
The diagram above illustrates an object moving in a circular path at constant speed. Which of the arrows indicates the direction of linear velocity?CorrectIncorrect
Which of the following thermometers is used to measure the temperature of the human body?CorrectIncorrect
In the diagram above, the time taken to trace a wave between P and Q isCorrectIncorrect
Which of the following materials does not serve as a safety device in electrical circuits?CorrectIncorrect
Which of the following liquids has the highest surface tension?CorrectIncorrect
The nucleon and proton numbers of a neutral atom of an element are 238 and 92 respectively. Determine the number of neutrons in the atom.CorrectIncorrect
An instrument used to measure relative humidity is theCorrectIncorrect
The area under a velocity-time graph representsCorrectIncorrect
Which of the following statements about a neutral atom is correct? TheCorrectIncorrect
Which of the following properties is not exhibited by sound waves?CorrectIncorrect
When ultraviolet light is incident on certain metallic surfaces, particles are emitted. These particles are calledCorrectIncorrect
Niels Bohr drew certain conclusions about the structure of the atom. Which of the following statements is one of those conclusions?CorrectIncorrect
The graph above illustrates the variation of temperature θ with time t for a solid that is being heated. Which processes take place at segments P and Q respectively?CorrectIncorrect