The differences observed in solids, liquids and gases may be accounted for by

the spacing and forces acting between the molecules

the different molecules in each of them

Temperature is the property of a body which is proportional to the ____.

average kinetic energy of its molecules

total kinetic energy of its molecules

average kinetic energy of its molecules

A narrow beam of white light can be split up into different colours by a glass prism. The correct explanation is that

different colours of white light travel with different speeds in glass

white light Is an electromagnetic wave

the prism has all the colours of the white light

different colours of white light travel with different speeds in glass

white light has undergone total Internal reflection in the prism

Which of the following is true of an electrical charge?

Positive charge means deficit electrons

Negative charge means excess of electrons

electric current means movement of electrons

The time rate of loss of heat by a body is proportional to the

difference in temperature between the body and its surroundings

temperature of its surroundings

difference in temperature between the body and its surroundings

ratio of the temperature of the body to that of its surroundings

Electrical appliances in homes are normally earthed so that

a person touching the appliances is safe from electric shock

both the a.c. and d.c. sources can be used

the appliances are maintained at a higher pd than the earth

the appliances are maintained at a lower pd than the earth

Natural radioactivity consists of the emission of

α- particles, β - rays and g-rays

Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?

heat ----> Kinetic ----> Electricity ----> Heat and Light

heat ----> Light----> Sound ----> Kinetic

Kinetic ----> Light ----> Heat ----> Electricity

heat ----> Kinetic ----> Electricity ----> Heat and Light

electricity ----> Kinetic ----> Heat ----> Light

High-energy electromagnetic waves

JAMB UTME - Physics - 2018 | Green Bridge CBT

Question 1 Report

A man walks 1km due east and then 1 km due north. His displacement is

√2km N 45°E

1km N 30°E

1km N 15°E

√2km N 60°E

Answer Details

The man first walks 1 km due east, which means he has moved 1 km horizontally to the right of his starting point. Then, he walks 1 km due north, which means he has moved 1 km vertically upwards from his previous position. To find his displacement, we need to draw a straight line from his starting point to his final position, which represents the shortest distance between the two points. This line is called the displacement vector. We can use the Pythagorean theorem to calculate the length of the displacement vector. The horizontal and vertical distances are the two legs of a right-angled triangle, and the hypotenuse is the length of the displacement vector. Using the Pythagorean theorem, we get: displacement = √((1 km)^2 + (1 km)^2) = √2 km The direction of the displacement vector is the angle between the displacement vector and the due north direction. We can find this angle using trigonometry. The tangent of the angle is the ratio of the horizontal distance to the vertical distance: tan(θ) = (1 km) / (1 km) = 1 Using a calculator, we can find that the angle is 45°. Therefore, the man's displacement is √2 km in the direction N 45° E. So, the correct answer is √2km N 45°E.

Read lesson note on Scalars And Vectors (JAMB)

Read lesson note on Position, Distance And Displacement (WAEC)






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