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20 questions
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- Q1What is the definition of a gravitational field?The force that opposes the motion of objects in contact.The region around an object with mass where it exerts a gravitational force on other objects.The region around a charged object where an electric charge can feel a force.The area around a magnet where magnetic objects experience a force.30sSC8.FM.1
- Q2Which of the following factors affects the strength of a gravitational field?Neither (a) nor (b).Both (a) and (b).The mass of the object creating the field.The distance between the object creating the field and the object experiencing the force.30s
- Q3What is the approximate acceleration due to gravity on Earth?9.8 m/s²1.6 m/s²5 mT25 μT30s
- Q4Why does a ball dropped on Earth fall faster than a ball dropped on the Moon?Earth has a stronger gravitational field than the Moon.Earth's rotation affects the ball's fall.The ball has less mass on the Moon.The Moon has no atmosphere.30s
- Q5What is the definition of an electric field?The region around a charged object where an electric charge can feel a force.The force that opposes the motion of objects in contact.The area around a magnet where magnetic objects experience a force.The region around an object with mass where it exerts a gravitational force on other objects.30s
- Q6How do electric field lines represent the direction of the electric field?Field lines point towards positive charges and away from negative charges.Field lines are always parallel to the surface of the charged object.Field lines point away from positive charges and towards negative charges.The direction of the electric field is unrelated to the field lines.30s
- Q7What is the formula for calculating the electric field strength (E) at a distance (r) from a point charge (Q)?E=μNE = \mu NE=μNE=kQr2E = \frac{kQ}{r^2}E=r2kQE=FqE = \frac{F}{q}E=qFE=ρghE = \rho ghE=ρgh30s
- Q8What happens to the strength of the electric field as you move closer to a charged object?The electric field strength becomes zero.The electric field strength increases.The electric field strength remains the same.The electric field strength decreases.30s
- Q9What is the definition of a magnetic field?The region around an object with mass where it exerts a gravitational force on other objects.The region around a charged object where an electric charge can feel a force.The area around a magnet where magnetic objects experience a force.The force that opposes the motion of objects in contact.30s
- Q10How do the poles of a magnet interact with each other?All poles attract each other.Like poles attract, unlike poles repel.All poles repel each other.Like poles repel, unlike poles attract.30s
- Q11What do the lines of force in a magnetic field represent?The direction and strength of the magnetic field.The amount of magnetic energy stored in the field.The path a magnetic object would take if placed in the field.The boundaries of the magnetic field.30s
- Q12How does a compass work?The compass needle points to the geographic North Pole.The compass needle aligns itself with Earth's magnetic field.The compass needle points in a random direction.The compass needle aligns itself with Earth's gravitational field.30s
- Q13What unit is used to measure the strength of a magnetic field?Newton (N)Pascal (Pa)Coulomb (C)Tesla (T)30s
- Q14What is the approximate strength of Earth's magnetic field at the surface?5 mT1.6 m/s²25 μT9.8 m/s²30s
- Q15Which of the following is not an application of magnetic fields?Electric motorsMeasuring liquid pressureMagnetic Resonance Imaging (MRI)Navigation using compasses30s