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Worksheets

K2 Revision

Total questions: 149

Worksheet time: 4hrs 39mins

Name
Class
Date
1.

From diagram, what 1.5 V refers to

a)

Internal resistance

b)

Potential difference

c)

Electromotive force

d)

Voltage

2.

From the graph, what is given by the gradient?

a)

Resistance

b)

Internal resistance

c)

Potential difference

d)

Electromotive force

3.

What is the electromotive force of battery?

a)

0.5 V

b)

1.0 V

c)

1.5 V

d)

2.0 V

4.

Calculate the internal resistance, r

a)

0.1 ohm

b)

0.2 ohm

c)

0.3 ohm

d)

0.4 ohm

5.

The voltmeter is recording the reading of

(a)  

6.

It is an energy supply by a battery/ electrical source to a coulumb unit of charge.

This refers to

a)

Potential difference

b)

Internal resistance

c)

Electromotive force

d)

Current

7.

It is a work done or energy supply to move a unit of charge from 1 point to another point in a closed circuit

This refers to

a)

Internal resistance

b)

Potential difference

c)

Electromotive force

d)

Resistance

8.
The cell has internal resistance, r, and electromotive force of 1.5 V.
What is the reading of voltmeter when the switch is closed?
a)
More than 3.0 V
b)
Less than 1.5 V
c)
More than 1.5 V
d)
1.5 V
9.
A battery has an e.m.f of 6.0 V. When it is connected to an external resistor, the potential different is 2.6 V and the current is 0.6 A. 
What is the value of the internal resistance?
a)
3.4 Ω
b)
4.3 Ω
c)
4.4 Ω
d)
5.7 Ω
10.

Correct

a)

r=ϵI−Rr=\frac{\epsilon}{I}-R  

b)

undefined 

c)

ϵ=V\epsilon=V  

11.

A battery of e.m.f. 12 V and internal resistance 1.5 Ω was connected to a 4.5 Ω resistor, what is the value for current?

a)

4A

b)

6A

c)

2A

d)

8A

12.

A battery of e.m.f. 12.0 V, with an internal resistance of 3.0 Ω, is connected in series with a 15.0 Ω resistor and a battery of e.m.f. 9.0 V, which has an internal resistance of 2.0 Ω. Calculate the p.d. of the 15Ω resistor.

a)

15.75V

b)

5.25V

c)

15.25V

d)

15.50V

13.

Ω\Omega  

a)

CJ−1A−1CJ^{-1}A^{-1}  

b)

AC−1J−1AC^{-1}J^{-1}  

c)

undefined 

14.
The circuit that can determine the electromotive force of the battery is
a)
A
b)
B
c)
C
d)
D
15.

The graph shows the change in current with potential difference for

a)

an LED

b)

a filament lamp

c)

a diode

d)

a thermistor

16.

To calculate the resistance of the component at a particular potential difference you

a)

read the current at that point on the graph and calculate p.d divided by current

b)

draw a tangent to the line at that point and calculate the gradient

c)

draw a tangent to the line at that point and calculate 1/gradient

d)

read the current at that point on the graph and calculate current/p.d

17.

Which component has the highest resistance?

a)

1

b)

2

18.

Where would you place a voltmeter in the circuit?

a)

Green ?

b)

Red ?

19.

Where would you place an ammeter in the circuit?

a)

Green ?

b)

Red ?

20.

What is the relationship between the readings on Ammeters A1, A2 and A3

a)

A1 = A2 + A3

b)

A3 = A1 + A2

c)

A1 = A2 = A3

d)

A3 = A1-A2

21.

What is the relationship between the readings on Ammeters A1, A2 and A3?

a)

A1 = A2 = A3

b)

A1 = A2 - A3

c)

A3 = A1 + A2

d)

A3 = A1 - A2

22.
The equivalent resistance in this circuit is 
a)
100 ohms
b)
450 ohms
c)
400 ohms
d)
30 ohms
23.

The p.d. across a resistor is 12 V. The power dissipated is 6.0 W.

Which statement is correct?

a)

The charge passing through the resistor in one second is 2.0 coulomb.

b)

The resistor transfers 6.0 joule for each coulomb passing through the resistor.

c)

The resistor transfers 12 joule in 2.0 second.

d)

The resistor dissipates 6.0 joule when the current is 2.0 ampere.

24.

A copper rod of cross-sectional area 3.0 × 10−4 m2 is used to transmit large currents.

A charge of 650 C passes along the rod every 5.0 s. Calculate the current I in the rod.

(a)  

25.

A battery charger contains a microprocessor circuit so that it can charge an AA rechargeable cell at a constant current of 450 mA. It takes 4 hours 40 minutes to charge a 1.5 V cell from a fully discharged state.

Calculate the charge Q passing through the cell during the charging process. (2 sig fig with units)

(a)  

26.

What is the amount of current flowing through an electric press, if the amount of charge passing through a conductor in 10 minutes is 300 0 C?

a)

30 A

b)

.3 A

c)

.5 A

d)

5 A

27.
Thicker wires have _______ resistance than thinner wires.
a)
more
b)
less
c)
the same
28.

Which resistor is in series with resistor R?

a)

R1

b)

R2

c)

R3

d)

R4

29.

The two ends of a 3.0-ohm resistor are connected to a 9.0-V battery. What is the current through the resistor?

a)

27 A

b)

6.3 A

c)

3.0 A

d)

0.33 A

30.

The two ends of a 3.0-ohm resistor are connected to a 9.0-V battery. What is the total power delivered by the battery to the circuit?

a)

3.0 W

b)

27 W

c)

0.33 W

d)

0.11 W

31.

The basic function of an electromotive force in a circuit is to do which of the following?

a)

Convert electrical energy into some other form.

b)

Convert some other form of energy into electrical.

c)

None of the above choices are valid.

32.

Three resistors connected in parallel have individual values of 4.0, 6.0 and 10.0 ohm, respectively. If this combination is connected in series with a 12-V battery and a 2.0-ohm resistor, what is the current in the 10-ohm resistor?

a)

0.59 A

b)

1.0 A

c)

11 A

d)

16 A

33.

Three resistors connected in parallel each carry currents labeled I1, I2 and I3. Which of the following expresses the value of the total current IT in the combined system?

a)

IT = I1 + I2 + I3

b)

IT = (1/I1 + 1/I2 + 1/I3)

c)

IT = I1 = I2 = I3

d)

IT = (1/I1 + 1/I2 + 1/I3)-1

34.

Which two resistors are in parallel with each other?

a)

R and R4

b)

R2 and R3

c)

R2 and R4

d)

R and R1

35.

If R1 < R2 < R3, and if these resistors are connected in parallel in a circuit, which one has the highest current?

a)

R1

b)

R2

c)

R3

d)

All have the same current.

36.

What is the maximum number of 60-W light bulbs you can connect in parallel in a 120-V home circuit without tripping the 30-A circuit breaker?

a)

11

b)

35

c)

59

d)

3600

37.

Household circuits are wired in ___________________.

a)

series

b)

parallel

c)

both series and parallel

d)

neither series nor parallel

38.

Find V5

a)

10.78 V

b)

7.65 V

c)

21.56 V

d)

7.56 V

39.

Find I1

a)

10.78 A

b)

7.19 A

c)

3.59 A

d)

7.65 A

40.

In circuit with battery, current flow from terminal __________ to terminal _________

a)

positive......negative

b)

negative......positive

c)

negative.....negative

d)

positive......positive

41.

What is the definition of current?

a)

rate of electron flow

b)

rate of charge flow

c)

rate of charge

d)

flow of charge

42.

if a charge with 60 C flow through a bulb in one minute. What is the value of the current?

a)

120 A

b)

30 A

c)

60 A

d)

1 A

43.

What is the meaning of 7 Volt?

a)

7 Coulomb charge required to move 1 Joule energy from a point to another point.

b)

7 Joule of energy required to move 7 Coulomb charge from a point to another point.

c)

7 Joule of energy required to move 1 Coulomb charge from a point to another point.

d)

7 Coulomb required to move 7 Joule energy from a point to another point.

44.

Ohm's Law states

a)

the current through a conductor between two points is directly proportional to the voltage across the two points

b)

the current through a conductor between two points is inversely proportional to the voltage across the two points

c)

the current through a conductor between two points is directly proportional to the resistance across the two points

d)

the voltage through a conductor between two points is directly proportional to the resistance across the two points

45.

Which are the Equations for Power?

a)

Power = Energy Transferred / Time (P=E/t)

b)

Power = Work Done / Time (P=W/t)

c)

Power = Energy Transferred x Time (P=Et)

d)

Power = Work Done x Time (P=Wt)

46.

What is the Equation for Charge Flow?

a)

Charge Flow = Current x Time (Q=It)

b)

Charge Flow = Current / Time (Q=I/t)

c)

Charge Flow = Time / Current (Q=t/I)

47.

What is another Equation for Power?

a)

Power = Potential Difference x Current (P=IV)

b)

Power = Potential Difference / Current (P=V/I)

c)

Power = Current / Potential Difference (P=I/V)

48.

PD

a)

potential difference = current × resistance

b)

potential difference = current / resistance

c)

potential difference = resistance / current

49.

Select all units of current in the list below:

a)

mA

b)

C

c)

V

d)

A

e)

m

50.
If the current through a circuit is 2 A and the resistance of a light bulb in the circuit is 10 Ohms, what is the voltage difference across the light bulb?
a)
5 V
b)
12 V
c)
0.2 V
d)
20 V
51.

How much charge flows through a wire in 80s if the current is a constant 5.4A?

a)

432C

b)

360C

c)

524C

d)

344C

52.

A wire has a resistance of 10 Ω\Omega  . It's length is now tripled, what would its new resistance be?

a)

30Ω

b)

20Ω

c)

10Ω

d)

40Ω

53.

What is the voltage of a bulb which produces 20J of energy for 2 Coulombs of charge?

a)

10V

b)

40V

c)

0.1V

d)

15V

54.
A correct statement of Ohm’s Law is:
a)
I= V R
b)
V ∝ I
c)
V = IR
d)
both b and c
55.

What is the equation for energy transferred in a circuit?

a)

E=IVtE=IVt

b)

E=ItVE=\frac{I}{tV}

c)

E=IVtE=\frac{IV}{t}

d)

E=tIVE=\frac{t}{IV}

56.
resistance of resistors in paralle
a)
1/R(total) = 1/R1 + 1/R2 + 1/R3 ...
b)
R(total) = R1 + R2 + R3...
c)
R(total) = 1/R1 + 1/R2 + 1/R3 ...
57.
resistance of resistors in a series
a)
R(total) = R1 + R2 + R3...
b)
1/R(total) = 1/R1 + 1/R2 + 1/R3 ...
c)
R(total) = 1/R1 + 1/R2 + 1/R3 ...
58.
which of the following is NOT a formula for power?
a)
P = I x R
b)
P = I x V
c)
P = E / t
d)
P = I² x R
59.
which of the following is NOT a formula for energy?
a)
E = P / t
b)
E = V x I x T
c)
Energy (kWh) = Power (kW) x Time (h)
d)
E = P x t
60.

The current I in a conductor is given by the equation shown. What does the letter n represent in this equation?

a)

charge carried per charge carrier

b)

number of charge carriers per unit area

c)

number of charge carriers per unit volume

d)

total mass of charge carriers per unit volume

61.

Which charge can be carried by a charge carrier?

a)

1.1 x 10^–19 C

b)

4.0 x 10^–19 C

c)

4.8 x 10^–19 C

d)

9.1 x 10^–19 C

62.

The electric current in a metal wire is 4.0 mA. How many electrons pass a fixed point in the wire in a time of 10 hours?

a)

2.5 x 10^17

b)

2.5 x 10^20

c)

9.0 x 10^20

d)

9.0 x 10^23

63.

A wire carries a current of 0.10 µA. The potential difference across the wire is 10 mV. How much energy is dissipated by the wire in a time of 10 s?

a)

1.0 pJ

b)

10 pJ

c)

1.0 nJ

d)

10 nJ

64.

A resistor of resistance R is connected across a cell of electromotive force (e.m.f.) E and negligible internal resistance. Which single change to the circuit would lead to the largest increase in the power dissipated in the resistor?

a)

doubling the value of E

b)

doubling the value of R

c)

halving the value of E

d)

halving the value of R

65.

In the circuit shown, the battery has an electromotive force (e.m.f.) of 6.0V and negligible internal resistance. The three resistors each have resistance R. The total power dissipated in the resistor network is 24W. What is the value of R?

a)

0.50 ohm

b)

1.0 ohm

c)

1.5 ohm

d)

2.3 ohm

66.

The diagram shows a network of resistors. Each resistor has a resistance of 6.0Ω. What is the total resistance of the network between points X and Y?

a)

3.0Ω

b)

5.0Ω

c)

7.2Ω

d)

18Ω

67.

Which graph could show how the resistance R of a filament lamp varies with the applied potential difference (p.d.) V, as V is increased to the normal operating p.d.?

a)

A

b)

B

c)

C

d)

D

68.

The potential difference across a metal wire is kept constant. The length l and the diameter d of the wire are both varied. The type of metal is kept the same. How is the current in the wire related to l and d ?

a)

It is directly proportional to l and inversely proportional to d

b)

It is directly proportional to l and inversely proportional to d^2 .

c)

It is inversely proportional to l and directly proportional to d

d)

It is inversely proportional to l and directly proportional to d^2 .

69.

Some resistors and a battery of electromotive force (e.m.f.) E and negligible internal resistance are connected in series, as shown. Which statement is correct?

a)

The e.m.f. across each resistor equals the potential difference across the battery.

b)

The potential difference across each resistor equals the e.m.f. E of the battery

c)

The sum of the e.m.f.s across the resistors equals the potential difference across the battery

d)

The sum of the potential differences across the resistors equals the e.m.f. E of the battery.

70.

The table shows the properties of two different wires, P and Q. Wire P has a cross-section of diameter d. What is the diameter of the cross-section of wire Q?

a)

0.41d

b)

1.6d

c)

2.7d

d)

7.1d

71.

A piece of conducting putty is in the shape of a cylinder of length 60 mm and diameter 20 mm. The resistance between the ends of the cylinder is 20Ω. What is the resistivity of the putty?

a)

0.033Ω m

b)

0.10Ω m

c)

0.42Ω m

d)

5.2Ω m

72.

A metal wire has a length of 2.50 m and a cross-sectional area of 4.50 X 10^–6 m2 . The resistivity of the metal is 3.50 x 10^–7 ohm.meter. The wire is stretched so that its length increases to 2.65 m. The wire remains cylindrical and the volume of the wire remains constant. What is the change in the resistance of the wire?

a)

0.012 ohm

b)

0.024 ohm

c)

0.19 ohm

d)

0.22 ohm

73.

An electrical cable is made up of one thick strand of copper wire that is surrounded by eight thin strands of copper wire. All nine strands of wire are connected in parallel with each other. A cross-section of the cable is shown. Each thin strand of wire has cross-sectional area A and length L. The thick strand of wire has cross-sectional area 4A and length L. The cable has total resistance R. Which expression gives the resistivity of copper?

a)

b)

c)

d)

74.

Which statement about the electromotive force (e.m.f.) of a cell is always correct?

a)

The e.m.f. is the energy converted from electrical to other forms in the cell

b)

The e.m.f. is the energy provided by the cell per unit charge passing through it.

c)

The e.m.f. is the potential difference across the internal resistance of the cell.

d)

The e.m.f. is the potential difference across the terminals of the cell.

75.

What is the definition of the potential difference across an electrical component?

a)

the resistance per unit current

b)

the charge per unit time passing through the component

c)

the force per unit charge

d)

the energy transferred per unit charge

76.

A cell has a constant electromotive force. A variable resistor is connected between the terminals of the cell. The resistance of the variable resistor is decreased. Which statement about the change of the cell’s terminal potential difference (p.d.) is correct?

a)

The terminal p.d. is decreased because more work is done moving unit charge through the internal resistance of the cell.

b)

The terminal p.d. is increased because more work is done moving unit charge through the variable resistor

c)

The terminal p.d. is decreased because the current in the variable resistor is decreased.

d)

The terminal p.d. is increased because the current in the variable resistor is increased.

77.

Kirchhoff’s first and second laws are a consequence of the conservation of which quantities?

a)

charge and energy

b)

charge and resistance

c)

mass and energy

d)

mass and resistance

78.

Kirchhoff’s two laws for electric circuits can be derived by using conservation laws. On which conservation laws do Kirchhoff’s laws depend?

a)

A

b)

B

c)

C

d)

D

79.

A circuit contains a cell of electromotive force E and internal resistance r connected to a resistor of resistance R. The current in the circuit is I. Which equation is correct?

a)

E + Ir = IR

b)

E – Ir = IR

c)

E = IR

d)

E – Ir = IR

80.

A battery of electromotive force (e.m.f.) 10V and internal resistance r is connected to three resistors of resistances R, 2.0Ω and 15Ω, as shown. A current of 0.45A is in the resistor of resistance 2.0Ω and a current of 0.48A is in the resistor of resistance 15Ω. What are the values of r and R?

a)

A

b)

B

c)

C

d)

D

81.

A potential divider consists of two resistors of resistances R1 and R2 connected in series across a source of potential difference (p.d.) Vin. The p.d. across R1 is Vout. Which changes to R1 and R2 will increase the value of Vout?

a)

A

b)

B

c)

C

d)

D

82.

In the circuit shown, a battery of negligible internal resistance is connected in series with a pair of fixed resistors R1 and R2. The circuit is to be used to test whether the electromotive force (e.m.f.) of a particular cell is 1.5V. The cell is connected between terminals X and Y in parallel with R2 and in series with a galvanometer. Which statement about the test is correct?

a)

Any non-zero reading on the galvanometer means the cell has an e.m.f. of 1.5V.

b)

The battery does not need to have an e.m.f. of 6.0V.

c)

The cell may be connected either way round between X and Y.

d)

The galvanometer does not need a scale calibrated in amperes.

83.

Four potential divider circuits each consist of a battery of electromotive force (e.m.f.) 9V and negligible internal resistance connected to a combination of resistors. Each of the resistors in the circuits has a resistance of X or 2X. Which circuit has the largest output voltage V?

a)

A

b)

B

c)

C

d)

D

84.

A battery of negligible internal resistance is connected in series with a thermistor and a fixed resistor of resistance 12.0kΩ, as shown. The table shows the resistance of the thermistor at two different temperatures.The potential difference Vout across the fixed resistor is 4.50V when the thermistor is at a temperature of 20.0°C. What is Vout when the thermistor is at a temperature of 50.0°C?

a)

2.65V

b)

3.18V

c)

6.35V

d)

10.8V

85.

Which graph shows the I–V characteristic of a filament lamp?

a)

A

b)

B

c)

C

d)

D

86.

A car has sensors for detecting the light intensity and temperature of its environment. The sensors make use of a light-dependent resistor (LDR) and a thermistor. The car moves from a warm and dark environment into a cold and bright environment. What are the changes to the resistances of the LDR and thermistor?

a)

A

b)

B

c)

C

d)

D

87.

The two resistors shown are both uniform cylinders of equal length made from the same conducting putty.


The diameter of Y is twice that of X. The resistance of Y is R.

What is the total resistance of the combination?

a)

4R5\frac{4R}{5}

b)

3R

c)

4R

d)

5R

88.

A voltmeter is used to measure potential difference for a component X.


Which row gives the position and ideal resistance for the voltmeter?

a)

A

b)

B

c)

C

d)

D

89.

The combined resistance of n identical resistors connected in parallel is Rn.


Which statement correctly describes the variation of Rn as n increases?

a)

Rn decreases linearly as n increases

b)

Rn decreases non-linearly as n increases

c)

Rn increases linearly as n increases

d)

Rn increases non-linearly as n increases

90.

In the circuit below, the potential difference across the light emitting diode (LED) is 1.8 V when it is emitting light.The current in the circuit is 20 mA.

What is the value of the resistor R?

a)

80 Ω

b)

90 Ω

c)

150 Ω

d)

180 Ω

91.

The table shows the resistivity, length and cross-sectional area of wires P and Q.

The resistance of wire P is R.

What is the total resistance of the wires when they are connected in parallel?

a)

R9\frac{R}{9}

b)

R3\frac{R}{3}

c)

2R3\frac{2R}{3}

d)

3R2\frac{3R}{2}

92.

he figure shows a light dependent resistor (LDR) and fixed resistor R connected in series across a cell. The internal resistance of the cell is negligible.

Which row shows how the readings on the ammeter and the voltmeter change when the light intensity incident on the LDR is increased?


a)

A

b)

B

c)

C

d)

D

93.

A wire has a resistance R.

What is the resistance when both the length and radius of the wire are doubled

a)

R4\frac{R}{4}

b)

R2\frac{R}{2}

c)

2R

d)

4R

94.

The current in the cell is 10 A as shown.

What is the current in the 2.0 Ω resistor?

a)

0.35A

b)

2.86A

c)

3.50A

d)

7.14A

95.

Which graph shows the variation of the resistance with temperature for an ntc thermistor?

a)

A

b)

B

c)

C

d)

D

96.

Which statement about superconductors is correct?

a)

When a material becomes a superconductor, its resistivity is almost zero.

b)

The temperature at which a material becomes a superconductor is called the critical temperature.

c)

When

current passes through a superconductor the pd across it becomes a maximum.

d)

Copper is a superconductor at room temperature

97.

Three cells each have an emf ε = 1.5 V and an internal resistance r = 0.6 Ω.


Which combination of these cells will deliver a total emf of 1.5 V and a maximum current of 7.5 A?

a)

A

b)

B

c)

C

d)

D

98.

A battery of negligible internal resistance and an emf of 12 V is connected in series with a heating element. The heating element has a resistance of 6.5 Ω when in operation.


What is the energy transferred by the heating element when operating for 5 minutes?

a)

111J

b)

390J

c)

6650J

d)

23400J

99.
a)

A

b)

B

c)

C

d)

D

100.

A mobile phone operates at a constant power of 200 mW

It has a 3.7 V lithium-ion battery that has a charge capacity of 9400 C


What is the time taken for the battery to discharge completely?

a)

2 hours

b)

48 hours

c)

120 hours

d)

140 hours

101.

A gas containing doubly-charged ions flows to give an electric current of 0.64 A


How many ions pass a point in 1.0 minute?

a)

2.0 × 1018

b)

4.0 × 1018

c)

1.2 × 1020

d)

2.4 × 1020

102.

A student carries out an experiment to determine the resistivity of a metal wire.

She determines the resistance from measurements of potential difference between the ends of the wire and the corresponding current. She measures the length of the wire with a ruler and the diameter of the wire using a micrometer. Each measurement is made with an uncertainty of 1%


Which measurement gives the largest uncertainty in the calculated value of the resistivity?

a)

current

b)

diameter

c)

length

d)

potential difference

103.
a)

A

b)

B

c)

C

d)

D

104.

Which is equivalent to the ohm?

a)

J C–2 s–1

b)

J C–2 s

c)

J s

d)

J s–1

105.

A circuit consists of two identical cells, a resistor, an ammeter and a voltmeter. The cells each have an emf of 3.0 V and the resistor has a resistance of 12 Ω

The cells have negligible internal resistance.

a)

A

b)

B

c)

C

d)

D

106.

Which graph shows how power dissipated P varies with current I in a component that obeys Ohm’s law?

a)

A

b)

B

c)

C

d)

D

107.

What is the direction of displacement of particles in longitudinal waves relative to the direction of energy propagation?

a)

Perpendicular

b)

Parallel

c)

Random

d)

None of the above

108.

Which of the following is evidence for the nature of transverse waves?

a)

Polarisation

b)

Reflection

c)

Refraction

d)

Diffraction

109.

At what speed do all electromagnetic waves travel in a vacuum?

a)

3 x 10^8 m/s

b)

1 x 10^6 m/s

c)

2.5 x 10^8 m/s

d)

5 x 10^8 m/s

110.

What is the formula to calculate the speed of a wave?

a)

c = λf

b)

c = λ/f

c)

c = fλ

d)

c = f/λ

111.

Which of the following is NOT an example of a transverse wave?

a)

Polarised light

b)

Waves on a string

c)

Electromagnetic waves

d)

Sound waves

112.
What is a wavelength of a wave?
a)
it is the shortest distance between any two points in phase.
b)
it is the shortest distance between any two points not in phase.
c)
It is the maximum possible displacement of a point from its rest position.
d)
It is the minimum possible displacement of a point from its rest position.
113.
What is the amplitude of a wave?
a)
it is the shortest distance between any two points in phase.
b)
it is the shortest distance between any two points not in phase.
c)
It is the maximum possible displacement of a point from its rest position.
d)
It is the minimum possible displacement of a point from its rest position.
114.
Which has the SHORTEST wavelength and, therefore, the highest frequency/most energy
a)
Radio waves
b)
Ultraviolet Rays
c)
Gamma Rays
d)
X-rays
115.
Which of the following type of electromagnetic radiation has the most energy
a)
infrared
b)
ultraviolet
c)
microwaves
d)
radiowaves
116.

What is the equation for total internal reflection?

a)

sin Theta c = N1 / N2

b)

sin Theta c = N2 / N1

c)

cos Theta c = N2 / N1

d)

cos Theta c = N1 / N2

117.

What is the unit of refractive index?

a)

Meter

b)

Dimensionless

c)

Radian

d)

Second

118.

2 points on a progressive wave are 1/3 of a wavelength apart. The distance between the two points is 2cm. If the speed of the wave is 10 ms-1 what is the frequency of the wave?

a)

5Hz

b)

20Hz

c)

167Hz

d)

1500Hz

119.

What are the conditions for total internal reflection of light to occur

a)

The light is travelling from a less optically dense medium to a more optically dense medium at an angle equal to the critical angle

b)

The light is travelling between media of equal optical densities at an angle greater the critical angle

c)

The light is travelling between media of equal optical densities at an angle equal to the critical angle

d)

The light is travelling from a more optically dense medium to a less optically dense medium at an angle greater than the critical angle

120.

The speed of light in a material is 1.7 x 108ms-1. What is the refractive index of the material?

a)

0.57

b)

1.43

c)

1.76

d)

2.31

121.

What is the energy in electron volts of a photon of ultra violet light of frequency 7.9 x 1014Hz?

a)

3.27eV

b)

1.48 eV

c)

37.9 x 104 eV

d)

8.38 x 10-38eV

122.
Light has the lowest velocity in which medium?
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45
a)
diamond
b)
water
c)
flint glass
d)
barium glass
123.
If the angle of incidence of light traveling through air, and then striking water is 30 degrees what is the angle of refraction? (n=1 air, n=1.33 water)
a)
15 degrees
b)
22 degrees
c)
43 degrees
d)
17 degrees
124.

Photons of wavelength 290 nm are incident on a metal plate. The work function of the metal is 4.1 eV


What is the maximum kinetic energy of the emitted electrons?

a)

0.19 eV

b)

4.3 eV

c)

6.9 eV

d)

8.4 eV

125.

A mobile phone operates at a constant power of 200 mW.

It has a 3.7 V lithium-ion battery that has a charge capacity of 9400 C


What is the time taken for the battery to discharge completely?

a)

2 hours

b)

48 hours

c)

120 hours

d)

140 hours

126.

The resistance of a negative temperature coefficient (ntc) thermistor

a)

increases as temperature increases.

b)

is constant at temperatures below 0 °C.

c)

increases as temperature decreases.

d)

falls to zero when a critical temperature is reached.

127.

Which dartboard contains a grouping of darts which are neither mathematically accurate nor precise?

a)

A

b)

B

c)

C

d)

D

128.

Which dartboard contains a grouping of darts which are mathematically accurate, but not precise?

a)

A

b)

B

c)

C

d)

D

129.

Which dartboard contains a grouping of darts which are mathematically precise, but not accurate?

a)

A

b)

B

c)

C

d)

D

130.

Which dartboard contains a grouping of darts which are both mathematically precise, AND accurate?

a)

A

b)

B

c)

C

d)

D

131.

Which shows the change in velocity, frequency and wavelength of an electromagnetic wave as it travels from an optically less dense to an optically more dense medium?

a)

Velocity: decreases

Frequency: decreases

Wavelength: unchanged

b)

Velocity: increases

Frequency: unchanged

Wavelength: increases

c)

Velocity: decreases

Frequency: unchanged

Wavelength: decreases

d)

Velocity: increases

Frequency: increases

Wavelength: unchanged

132.

For waves on a water surface, the following graph shows how the displacement y of a water particle in the surface varies with the time t.


What are the quantities z and s?

a)

z: frequency

s: amplitude

b)

z: period

s: half-amplitude

c)

z: wavelength

s: half-amplitude

d)

z: period

s: amplitude

133.

Sound waves cross a boundary between two media X and Y. The frequency of the waves in X is 400 Hz. The speed of the waves in X is 330 m s–1 and the speed of the waves in Y is 1320 m s–1. What are the correct frequency and wavelength in Y?

a)

Frequency / Hz: 100

Wavelength / m: 0.82

b)

Frequency / Hz: 400

Wavelength / m: 0.82

c)

Frequency / Hz: 400

Wavelength / m: 3.3

d)

Frequency / Hz: 1600

Wavelength / m: 3.3

134.

Which statement is correct about the properties of an unpolarised electromagnetic wave as it passes through a polariser?

a)

The wave remains unchanged.

b)

The wave does not pass through the polariser.

c)

The wave’s electric field oscillates along the direction of travel.

d)

The intensity of the wave is reduced.

135.

The graph shows how the vertical height of a travelling wave varies with distance along the path of the wave.


The speed of the wave is 20 cm s–1.


What is the period of the wave?

a)

0.1 s

b)

0.2 s

c)

5.0 s

d)

10.0 s

136.

The sound quality of a portable radio is improved by adjusting the orientation of the aerial.

Which statement is a correct explanation of this improvement?

a)

The radio waves from the transmitter are polarised.

b)

The radio waves from the transmitter are unpolarised.

c)

The radio waves become polarised as a result of adjusting the aerial.

d)

The radio waves become unpolarised as a result of adjusting the aerial.

137.

A progressive wave in a stretched string has a speed of 20 m s−1 and a frequency of 100 Hz.

What is the phase difference between two points 25 mm apart?

a)

zero

b)

π/4 rad

c)

π/2 rad

d)

π rad

138.

A ray of light is incident on a glass–air boundary of a rectangular block as shown.


The refractive index of this glass is 1.5

The refractive index of air is 1.0

The angle of incidence of the light at the first glass–air boundary is 44°


What is the path of the ray of light?

a)

A

b)

B

c)

C

d)

D

139.

Rays of light are incident at the same angle θ on the core–cladding boundary of optical fibres P and Q. The cores of P and Q have the same refractive index n.


P and Q are the same length L. The core diameter of P is half that of Q.


The time for the ray to travel along optical fibre P is (nL)/(csinθ) where c is the speed of light in a vacuum.


What is the time for the ray to travel along optical fibre Q?

a)
b)
c)
d)
140.

An electromagnetic wave enters a fibre-optic cable from air. On entering the cable, the wave slows down to three-fifths of its original speed.


What is the refractive index of the core of the fibre-optic cable?

a)

0.67

b)

1.33

c)

1.50

d)

1.67

141.

The diagram shows part of the path of a ray of light through a right-angled prism.


The prism is made of glass of refractive index 1.5.

The incident light ray is parallel to the face XY. The ray is refracted towards the face XY.


What is the path of the ray after it is incident on face XY?

a)
b)
c)
d)
142.

Which row shows the change in velocity, frequency and wavelength of an electromagnetic wave as it travels from an optically less dense to an optically more dense medium?

a)

A

b)

B

c)

C

d)

D

143.

The diagram shows a ray of light travelling in air and incident on a glass block of refractive index 1.5.


What is the angle of refraction in the glass?

a)

22.5°

b)

23.3°

c)

33.1°

d)

59.4°

144.

A layer of liquid of refractive index 1.6 covers the horizontal flat surface of a glass block of refractive index 1.5. A ray of light strikes the boundary between them at an angle such that it travels along the boundary afterwards.


How does the ray strike the boundary?

a)

it travels in glass at an angle of 70° to the boundary

b)

it travels in glass at an angle of 20° to the boundary

c)

it travels in the liquid at an angle of 70° to the boundary

d)

it travels in the liquid at an angle of 20° to the boundary

145.

Monochromatic light may be characterised by its speed, frequency and wavelength. Which of the following quantities change when monochromatic light passes from air into glass?

a)

Speed only.

b)

Speed and wavelength only.

c)

Speed and frequency only.

d)

Wavelength and frequency only.

146.

Which of the following is correct when total internal reflection occurs?

a)

the angle of incidence is less than the critical angle

b)

the light meets an optically less dense medium

c)

the light enters a medium with a higher refractive index

d)

the angles that the incident and refracted rays make with the normal are the same

147.

What is the speed of light in glass of refractive index 1.42?

a)

4.26 × 107 m s−1

b)

2.11 × 108 m s−1

c)

3.00 × 108 m s−1

d)

4.73 × 108 m s−1

148.

Figures 1 and 2 each show a ray of light incident on a water-air boundary. A, B, C and D show ray directions at the interface. Which of the following corresponds to a direction in which a ray cannot occur.

a)

A

b)

B

c)

C

d)

D

149.

Figures 1 and 2 each show a ray of light incident on a water-air boundary. A, B, C and D show ray directions at the interface. Which of the following corresponds to the direction of the faintest ray.

a)

A

b)

B

c)

C

d)

D

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