  Rev Quiz 1 on Magnetism, EM and EMI(Other school papers)

Quiz by Jessica Lew

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Correct quiz answers unlock more play!  16 questions
• Q1

A compass needle is placed near one end of a coil of wire at position 1. When a current is passed through the coil, the compass needle points in the direction shown. What will cause the needle of the compass to point closer to magnetic north? [Dunman 2021] When the compass is moved to position 2

When the current through the coil is decreased

When the compass is moved nearer to the coil.

When the current through the coil is increased.

60s
• Q2

A positively charged particle is projected into a region of uniform magnetic field M. Which diagram represents the motion of the particle in the magnetic field?[Dunman 2021]    60s
• Q3

A student uses a cathode-ray oscilloscope (c.r.o.) to measure the period of a signal. She sets the time-base of the c.r.o. to 5 ms/cm and observes the trace illustrated below. The trace has a length of 10.0 cm. What is the period of the signal?[Dunman 2021] 7.1 × 10–3 s

7.1 × 10–6 s

1.4 × 10–2 s

1.4 × 10–5 s

60s
• Q4

A wire connected to a resistor is moved in a magnetic field. A current is induced in the direction shown. In which direction did the wire move?[Dunman 2021] D

C

B

A

60s
• Q5

Power losses in transmission cables are reduced by increasing the transmission voltage. What is the explanation for this reduction?[Dunman 2021]

The resistance of the cable increases, reducing the current.

The current decreases, reducing thermal energy losses.

The resistance of the cable decreases.

The current increases, increasing the flow of charge.

60s
• Q6

A student sets up the experiment as shown in the diagram. P and Q repel each other. Which of the following correctly gives the poles at P and Q?[PLMGS 2021] P(north); Q(north)

P(north); Q(south)

P(south); Q(north)

P(south); Q(south)

60s
• Q7

Three wires P, Q and R are each carrying a current of 1 A in the direction as shown in the diagram below. What are the directions of forces acting on the three wires?[PLMGS 2021] P(Left)Q(Left)R(Left)

P(right)Q(right)R(right)

P(left)Q(right)R(left)

P(right)Q(Left)R(right)

60s
• Q8

Hot air from a hair-dryer contains many negatively charged ions. The hot air is directed between the poles of a strong magnet as shown in the diagram. What is the effect of the magnet on the negatively charged ions?[PLMGS 2021] They are deflected upwards.

They are deflected downwards.

They are deflected towards the South pole, S.

They are deflected towards the North pole, N

60s
• Q9

The diagram shows the direction of two plotting compass needles when placed near two bar magnets. What are the likely poles at A and B?[PHSS 2021] Pole at A(south); Pole at B(south)

Pole at A(north); Pole at B(south)

Pole at A(north); Pole at B(north)

Pole at A(south); Pole at B(north)

60s
• Q10

Jean wanted to test the magnetic properties of the following three objects. She made the following observations:

●       P repels U.

●       P attracts T.

●       Both Rand S are attracted by P.

Which conclusion is true?[PHSS 2021] Objects 1 and 3 are magnets while object 2 is a magnetic material

Objects 1 and 2 are magnets while object 3 is a magnetic material.

Objects 1, 2 and 3 are magnets.

Objects 2 and 3 are magnets while object 1 is a magnetic material

60s
• Q11

A student sets up the apparatus shown in order to make a relay. Which metal should be used to make X, Y and Z?[PHSS 2021] X(iron), Y(copper), Z(steel)

X(iron), Y(copper), Z(iron)

X(steel), Y(copper), Z(iron)

X(copper), Y(steel), Z(iron)

60s
• Q12

An electron enters a region of magnetic field as shown below. What will happen to the electron e?[PLMGS 2021] It experiences an upward force.

It experiences a force into paper.

It experiences a downward force

It is not affected and continue to travel straight through

60s
• Q13

The diagram shows a current flowing in a wire placed between the poles of a magnet. The same current in the wire repeatedly changes its direction as shown in the graph. What is the effect on the wire?[PHSS 2021] The force on the wire is constant in size and direction.

The force on the wire keeps changing in size and alternates between one direction and the opposite direction.

The force on the wire keeps changing in size but acts in the same direction

The force on the wire is constant in size and alternates between one direction and the opposite direction.

60s
• Q14

The diagram shows an electron at point P in a uniform magnetic field.

Which of the following states of motion of the electron is the induced force exerted on the electron equal to zero?

I Electron is not moving.

II Electron is moving perpendicularly into the page.

III Electron is moving perpendicularly out of the page.

IV The electron is moving.

[JVSS 2021] II and III only

I, II and III only

I only

II, III and IV only

60s
• Q15

A small coil is connected to a galvanometer as shown. The magnet is pushed towards the coil, moves through the coil and then moves away from the coil on the right. How would the deflection of the galvanometer from the zero position change as it gets pushed through the coil?[JVSS 2021] approaching the coil(deflect left);moving through coil(deflect left);moving away from coil(deflect right)

approaching the coil(deflect left);moving through coil(deflect right);moving away from coil(deflect left)

approaching the coil(deflect left);moving through coil(no deflection);moving away from coil(deflect right)

approaching the coil(deflect right);moving through coil(no deflection);moving away from coil(deflect right)

120s

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