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A quantity of water at 0 °C is heated to 30 °C. For each degree rise in temperature, its density will?

A. rise steadily B. fall steadily C. fall and then rises D. rise and then falls Correct Answer: Option B – fall steadily Explanation When a liquid or gas is heated, the molecules move faster, bump into each other, and spread apart. This is Because the molecules...

The engine of a car provides a forward force of 1240 N and the total resistive force on the car is 800N. If the mass of the car is 1220 kg, determine the distance the car has to travel from the rest before acquiring a speed of 4 m s−1.

by Sunday | Jan 11 | Physics WAEC

A. 44.0 m B. 22.2 m C. 11.1 m D. 5.5 m Correct Answer: Option B – 22.2 m

Which of the folowing statements about light travelling from one material medium to another is not correct?

by Sunday | Jan 11 | Physics WAEC

A. The refracted angle is less than the incident angle if the speed is higher in the first material A. Its wavelength does not change B. It bends away from the normal if the speed is lower in the first material D. Its frequency changes. Correct Answer: Option D...

Which of the following concepts is a method of heat transfer that does not require a material medium?

by Sunday | Jan 11 | Physics WAEC

A. Conduction B. Diffusion C. Convection D. Radiation Correct Answer: Option D – Radiation Explanation Radiation is energy that comes from a source and travels through space and may be able to penetrate various materials. Light, radio, and microwaves are good...

The diameter of a brass ring at 30 °C is 50.0 cm. To what temperature must this ring be heated to increase its diameter to 50.29 cm? [ linear expansivity of brass = 1.9 x 10−5 K−1]

by Sunday | Jan 11 | Physics WAEC

A. 152.6 °C B. 182.6 °C C. 306.1 °C D. 335.5 °C Correct Answer: Option A = 152.6 °C

Which of the following statements-about electromagnetic waves is not correct?

by Sunday | Jan 11 | Physics WAEC

A. They carry energy as they travel through space B. They travel with the speed of light C. They are longitudinal D. The electric and magnetic fields are at right angles to each other Correct Answer: Option C – They are longitudinal Explanation All...

The distance between the fixed points of a mercury-in-glass thermometer is 30 cm. Determine the temperature when the mercury level is 10.5 cm above the lower fixed point

by Sunday | Jan 11 | Physics WAEC

A. 28.6ºC B. 30.0 ºC C. 35.0 ºC D. 40.5 ºC Correct Answer: Option C = 35.0 ºC

A hunter fires a gun at a point 408 m away from a cliff. If he hears an echo 2.4 s later; determine the speed of the sound wave

by Sunday | Jan 11 | Physics WAEC

A. 340 ms−1 B. 380 m s−1 C. 400 m s −1 D. 680 m s−1 Correct Answer: Option A – 340 ms−1 Explanation speed of the sound wave = distance ∗ 2/time = 408∗2/2.4 : speed of the sound wave = 340...

When the direction of vibration of the particles of a medium is perpendicular to the direction of propagation of a wave; the wave is said to be?

by Sunday | Jan 11 | Physics WAEC

A. longitudinal B. transverse C. mechanical D. a sound wave Correct Answer: Option B – transverse Explanation In physics, a transverse wave is a wave whose oscillations are perpendicular to the direction of the wave’s advance. This is in contrast to a...

The half-life of a radioactive substance is 15 hours. If at some instance, the sample has a mass of 512 g, calculate the time it will take 78 of the sample to decay

by Sunday | Jan 9 | Physics WAEC

A. 15 hours B. 30 hours C. 45 hours D. 60 hours Correct Answer: Option C – 45 hours

A quantity of water at 0 °C is heated to 30 °C. For each degree rise in temperature, its density will?

The engine of a car provides a forward force of 1240 N and the total resistive force on the car is 800N. If the mass of the car is 1220 kg, determine the distance the car has to travel from the rest before acquiring a speed of 4 m s−1.

Which of the folowing statements about light travelling from one material medium to another is not correct?

Which of the following concepts is a method of heat transfer that does not require a material medium?

The diameter of a brass ring at 30 °C is 50.0 cm. To what temperature must this ring be heated to increase its diameter to 50.29 cm? [ linear expansivity of brass = 1.9 x 10−5 K−1]

Which of the following statements-about electromagnetic waves is not correct?

The distance between the fixed points of a mercury-in-glass thermometer is 30 cm. Determine the temperature when the mercury level is 10.5 cm above the lower fixed point

A hunter fires a gun at a point 408 m away from a cliff. If he hears an echo 2.4 s later; determine the speed of the sound wave

When the direction of vibration of the particles of a medium is perpendicular to the direction of propagation of a wave; the wave is said to be?

The half-life of a radioactive substance is 15 hours. If at some instance, the sample has a mass of 512 g, calculate the time it will take 78 of the sample to decay

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