Question 1

What is the definition of a gravitational field?

Accepted Answer

The region around an object with mass where it exerts a gravitational force on other objects.

Answer

The force that opposes the motion of objects in contact.

Answer

The region around a charged object where an electric charge can feel a force.

Answer

The area around a magnet where magnetic objects experience a force.

Question 2

Which of the following factors affects the strength of a gravitational field?

Accepted Answer

Both (a) and (b).

Answer

Neither (a) nor (b).

Answer

The mass of the object creating the field.

Answer

The distance between the object creating the field and the object experiencing the force.

Question 3

What is the approximate acceleration due to gravity on Earth?

Accepted Answer

9.8 m/s²

Answer

1.6 m/s²

Answer

5 mT

Answer

25 μT

Question 4

Why does a ball dropped on Earth fall faster than a ball dropped on the Moon?

Accepted Answer

Earth has a stronger gravitational field than the Moon.

Answer

Earth's rotation affects the ball's fall.

Answer

The ball has less mass on the Moon.

Answer

The Moon has no atmosphere.

Question 5

What is the definition of an electric field?

Accepted Answer

The region around a charged object where an electric charge can feel a force.

Answer

The force that opposes the motion of objects in contact.

Answer

The area around a magnet where magnetic objects experience a force.

Answer

The region around an object with mass where it exerts a gravitational force on other objects.

Question 6

How do electric field lines represent the direction of the electric field?

Accepted Answer

Field lines point away from positive charges and towards negative charges.

Answer

Field lines point towards positive charges and away from negative charges.

Answer

Field lines are always parallel to the surface of the charged object.

Answer

The direction of the electric field is unrelated to the field lines.

Question 7

What is the formula for calculating the electric field strength (E) at a distance (r) from a point charge (Q)?

Accepted Answer

E=kQr2E = \frac{kQ}{r^2}E=r2kQ​

Answer

E=μNE = \mu NE=μN

Answer

E=FqE = \frac{F}{q}E=qF​

Answer

E=ρghE = \rho ghE=ρgh

Question 8

What happens to the strength of the electric field as you move closer to a charged object?

Accepted Answer

The electric field strength increases.

Answer

The electric field strength becomes zero.

Answer

The electric field strength remains the same.

Answer

The electric field strength decreases.

Question 9

What is the definition of a magnetic field?

Accepted Answer

The area around a magnet where magnetic objects experience a force.

Answer

The region around an object with mass where it exerts a gravitational force on other objects.

Answer

The region around a charged object where an electric charge can feel a force.

Answer

The force that opposes the motion of objects in contact.

Question 10

How do the poles of a magnet interact with each other?

Accepted Answer

Like poles repel, unlike poles attract.

Answer

All poles attract each other.

Answer

Like poles attract, unlike poles repel.

Answer

All poles repel each other.

Question 11

What do the lines of force in a magnetic field represent?

Accepted Answer

The direction and strength of the magnetic field.

Answer

The amount of magnetic energy stored in the field.

Answer

The path a magnetic object would take if placed in the field.

Answer

The boundaries of the magnetic field.

Question 12

How does a compass work?

Accepted Answer

The compass needle aligns itself with Earth's magnetic field.

Answer

The compass needle points to the geographic North Pole.

Answer

The compass needle points in a random direction.

Answer

The compass needle aligns itself with Earth's gravitational field.

Question 13

What unit is used to measure the strength of a magnetic field?

Accepted Answer

Tesla (T)

Answer

Newton (N)

Answer

Pascal (Pa)

Answer

Coulomb (C)

Question 14

What is the approximate strength of Earth's magnetic field at the surface?

Accepted Answer

25 μT

Answer

5 mT

Answer

1.6 m/s²

Answer

9.8 m/s²

Question 15

Which of the following is not an application of magnetic fields?

Accepted Answer

Measuring liquid pressure

Answer

Electric motors

Answer

Magnetic Resonance Imaging (MRI)

Answer

Navigation using compasses

Question 16

What is the direction of electric field lines around a negative charge?

Accepted Answer

Pointing towards the charge

Answer

Pointing away from the charge

Answer

The direction of the electric field is unrelated to the field lines

Answer

Parallel to the surface of the charged object

Question 17

What is the relationship between the strength of an electric field and the distance from the charge?

Accepted Answer

The field strength decreases as distance increases.

Answer

The field strength is zero at any distance from the charge.

Answer

The field strength increases as distance increases.

Answer

The field strength is not affected by distance.

Question 18

What early observation demonstrated the existence of electric charge?

Accepted Answer

Thales of Miletus rubbing fur on amber and attracting light objects.

Answer

Archimedes discovering buoyancy while in the bath.

Answer

A compass aligning with Earth's magnetic field.

Answer

Newton's apple falling from a tree.

Question 19

Which of the following is a practical application of understanding electric fields?

Accepted Answer

Insulating materials to protect against electric shocks.

Answer

Designing dams and submarines.

Answer

Building stable bridges and buildings.

Answer

Understanding why objects float.

Question 20

What is the relationship between gravitational field strength and the mass of the object creating the field?

Accepted Answer

Objects with larger mass have stronger gravitational fields.

Answer

Only objects with very large mass have gravitational fields.

Answer

Objects with larger mass have weaker gravitational fields.

Answer

Gravitational field strength is not affected by mass.

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