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Physics Cambridge Alevel Electricity Topical MCQs with answers
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Electricity When the four lamps are connected as shown in diagram 2, whichMay 02 statement is correct?
1. The graphs show the variation with potential difference V of A The lamps do not light.
the current I for three circuit elements. B The lamps are less bright than normal.
C The lamps have normal brightness.
D The lamps are brighter than normal.
7. A potential divider is used to give outputs of 2 V and 3V from a 5
V source, as shown.
The three circuit elements are a metal wire at constant
temperature, a semiconductor diode and a filament lamp.
Which row of the table correctly identifies these graphs?
What are possible values for the resistances R1, R2 and R3?
2. In the circuit below, the battery converts an amount E of
chemical energy to electrical energy when charge Q passes
through the resistor in time t.
8. Two parallel conducting plates are connected to a battery, one
plate to the positive terminal and the other plate to the negative. The
Which expressions give the e.m.f. of
plate separation is gradually increased, the plates remaining
the battery and the current in the
connected to the battery. Which graph shows how the electric field E
resistor?
between the plates depends on the plate separation x ?
Nov 02
3. The filament of a 240 V, 100W electric lamp heats up from 9. The combined resistance RT of two resistors of resistances R1
room temperature to its operating temperature. As it heats up, its and R2 connected in parallel is given by the formula
resistance increases by a factor of 16.
What is the resistance of this lamp at room temperature?
Which statement is used in the derivation of this formula?
A 36Ω B 580Ω C 1.5 kΩ D 9.2 kΩ A The currents through the two resistors are equal.
B The potential difference across each resistor is the same.
C The supply current is split between the two resistors in the same
4. The diagrams show connected wires which carry currents I1,
ratio as the ratio of their resistances.
I2, I3 and I4. The currents are related by the equation I1 + I2 = I3 + I4.
D The total power dissipated is the sum of the powers dissipated in
To which diagram does this equation apply?
the two resistors separately.
10 The graph shows how the current through a lamp filament varies
with the potential difference across it.
5. Which path shows a possible movement of an electron in the
electric field shown?
6. When four identical lamps P, Q, R and S are connected as Which statement explains the shape of this graph?
shown in diagram 1, they have normal brightness. A As the filament temperature rises, electrons can pass more easily
through the filament.
B It takes time for the filament to reach its working temperature.
C The power output of the filament is proportional to the square of
the current through it.
D The resistance of the filament increases with a rise in
temperature.
, 11. The variation with potential difference V of the current I in a 15. Six resistors, each of resistance 5 Ω, are connected to a 2 V cell
semiconductor diode is shown below. of negligible internal resistance.
What is the potential difference between terminals X and Y?
16. Which diagram shows the electric field pattern of an isolated
What is the resistance of the diode for applied potential negative point charge?
differences of +1.0 V and –1.0 V?
June 03
17. What physical quantity would result from a calculation in which a
potential difference is multiplied by an electric charge?
12. At a circuit junction, a current I divides into currents I1, I2 & I3. A electric current B electric energy
C electric field strength D electric power
18. The current in a component is reduced uniformly from 100 mA to
These currents are related 20 mA over a period of 8.0 s.
by the equation What is the charge that flows during this time?
I = I1 + I2 + I3 .
A 160mC B 320mC C 480mC D 640mC
19. The sum of the electrical currents into a point in a circuit is equal
Which law does this statement illustrate and on what principle is to the sum of the currents out of the point.
the law based? Which of the following is correct?
A Kirchhoff’s first law based on conservation of charge A This is Kirchhoff’s first law, which results from the conservation of
B Kirchhoff’s first law based on conservation of energy charge.
C Kirchhoff’s second law based on conservation of charge B This is Kirchhoff’s first law, which results from the conservation of
D Kirchhoff’s second law based on conservation of energy energy.
13. Which equation is used to define resistance? C This is Kirchhoff’s second law, which results from the conservation
2
A power = (current) x resistance of charge.
B resistivity = resistance x area ÷ length D This is Kirchhoff’s second law, which results from the conservation
C potential difference = current x resistance of energy.
2
D energy = (current) x resistance x time
20. The e.m.f. of the cell in the following circuit is 9.0V. The reading
14. In the potentiometer circuit below, the moveable contact is on the high-resistance voltmeter is 7.5V.
placed at N on the bare wire XY, such that the galvanometer
shows zero deflection.
What is the current I ?
A 0.1A B 0.5A C 0.6A D 2.0A
The resistance of the variable resistor is now increased.
21. The diagram shows an arrangement of four resistors.
What is the effect of this increase on the potential difference
across the wire XY and on the position of the moveable contact
for zero deflection?
What is the resistance between X and Y?
A 4kΩ B 8kΩ C 16 kΩ D 32 kΩ
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