MCQ Questions

Question No. 1

Define the following terms:

Answer :

a) gravitational field

b) electric field

c) magnetic field

d) line of force

Question No. 2

Consider the gravitational fields of the sun and the Earth. The mass of the sun is about 3.3 × 10⁵ larger than the mass of the Earth.

Answer :

a) Which of the two gravitational fields is stronger at a point midway between the sun and the Earth? Why?

b) The Earth and Mars are approximately 1.5 × 10⁸ km and 2.3 × 10⁸ km, respectively, away from the sun. Where is the gravitational field of the sun stronger – on Earth or on Mars?

c) The moon is on average 3.8 × 10⁵ km away from the Earth and 1.5 × 10⁸ km away from the sun. Why does the moon orbit the Earth and not the sun?

Question No. 3

You are given a bar magnet with eight positions marked 1 to 8 in its force field, as shown in Figure 4.9. Alongside the magnet are four plotting compasses marked a to d, with the needle coloured in red pointing towards the south pole.

Answer :

a) Match each of the positions 1 to 8 in the magnetic field with a compass showing the correct direction at that point. Each compass may be used more than once.

b) At which point(s) is the magnetic field the strongest?

Question No. 4

Figure 4.10 shows a negative charge with three points marked a to c around it.

Answer :

a) Draw the direction of the electric field at each of the points marked a to c.

b) At which of the three points is the electric field the weakest?

Question No. 5

The diagrams in Figure 4.11 show part of magnetic field patterns using adjacent bar magnets. Identify the poles marked A and B in each diagram.

Answer :

Question No. 6

Which one of the following is not correct?

Answer :

Force fields are characterized by forces at an action.

The strength of the force field increases with increasing distance from the source of the field.

The sources of a force field could be a mass or a charge or a magnet.

Force fields are vectors because they have both magnitude and direction.

Question No. 7

Which one of the following statements about lines of force in a force field is correct?

Answer :

The lines of force in an electric field always point towards a positive charge.

The lines of force in a magnetic field always point towards the north pole.

The force field is stronger where the lines of force are further apart.

Lines of force do not cross each other.

Chapter

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