retest

1. 1 Light enters a glass block at an angle of incidence i and it produces an angle of refraction r in the
glass.
glass
block
r
i
Several different values of i and r are measured, and a graph is drawn of sin i against sin r.
Which graph is correct?
sin i
sin r
sin i
sin r
sin i
sin r
1.0
0.5
0
0 0.5 1.0
sin i
sin r
A B C D
1.0
0.5
0
0 0.5 1.0
1.0
0.5
0
0 0.5 1.0
1.0
0.5
0
0 0.5 1.0
Beaconhouse School System
Retest- Physics
Class: XIC
Name:
Total marks:65
Objective
2 A swimming pool is lit by an underwater light.
A ray of light is incident on the water surface.
What is the correct path for the ray of light?
water surface
A
B
D
C
light
Total marks: 15

2. 3 Which diagram shows the action of a converging lens on a parallel beam of light?
B
A
D
C
4 What is a feature of red light compared with that of violet light?
A A prism deviates red light more.
B Red light has a lower frequency.
C Red light has a shorter wavelength.
D The speed of red light in a vacuum is smaller.
5 What is the ratio of the longest sound wavelength audible to a healthy human ear to the shortest?
A 20:1 B 1000:1 C 10000:1 D 20000:1
6 Ultrasound is used to clean jewellery in a liquid.
What is another use of ultrasound?
A optical fibre communication
B pre-natal scanning
C sunbeds
D telephone communications

3. 7 Bar magnets and various non-magnetic and demagnetised metal bars are placed in the different
arrangements shown.
In which arrangement do the bars repel?
N
A
S
N
C
S
S
N N
D
S S
N
iron N
B
S copper
8 The diagram shows how the height above the ground of a rope transmitting a wave varies with
distance from the source of vibrations at one instant in time.
80
60
40
20
0
height above
ground/cm
0 0
2 0
4 0
6 120
What is the amplitude of the wave shown?
A 30cm B 34cm C 72cm
80 100
distance from source/cm
D 74cm
9 A vibrator produces 12 wavelengths on the surface of water in 10s. The spacing between the first
crest and the third crest is 60cm.
What is the speed of the wave?
A 24cm/s B 25cm/s C 36cm/s D 72cm/s

4. 10 There is varying current in the coil of the loudspeaker shown. The loudspeaker is producing a
sound. The magnet is clamped.
coil
magnet
clamp
cone
What is vibrating to produce the sound?
A coil only
B cone only
C magnet only
D coil and cone
11 Two insulated and uncharged metal spheres X and Y are touching.
A positively charged rod is held near X and then the spheres are moved apart.
X now has a negative charge.
X Y
+
+
+
What is the charge on Y?
A negative and smaller than that on X
B negative and the same size as that on X
C positive and smaller than that on X
D positive and the same size as that on X

5. 12 A stationary negative charge in an electric field experiences an electric force in the direction
shown.
force
left right
–
What is the direction of the electric field?
A to the left
B to the right
C down the page
D up the page
13 A battery consists of three identical cells in parallel.
What is the unit of electromotive force (e.m.f.) and to what is the e.m.f. of the battery equal?
unit e.m.f. of the battery is equal to
A J/C the sum of the e.m.f.s of the three cells
B J/C the e.m.f. of one of the cells
C N/V the sum of the e.m.f.s of the three cells
D N/V the e.m.f. of one of the cells
14 A metal wire of length l and cross-sectional area A has resistance R.
2
A second wire is made from the same metal. It has a length 2l and a cross-sectional area 4A.
What is the resistance of the second wire?
A 8R B 2R C R D R
8
15 A rectangular current-carrying coil is pivoted between the poles of an electromagnet.
Which action does not, on its own, increase the size of the turning effect exerted on the coil?
A increasing the current in the coils of the electromagnet
B increasing the current in the rectangular coil
C reversing the current in the electromagnet
D increasing the number of turns on the rectangular coil

6. 1 Fig. 8.1 shows a lamp from a car. It contains two metal filaments.
filament 1
filament 2
Fig. 8.1
(a) (i) Complete the boxes to describe the transfer of energy that takes place when the lamp is
switched on.
........................ energy .................................. and .................................. energy
[3]
(ii) The efficiency of the metal filament lamp is less than 10%.
State what is meant by efficiency.
...........................................................................................................................................
..................................................................................................................................... [2]
(b) The two filaments are usually connected in parallel to a car battery.
A student investigates what happens when the filaments are connected in series, rather than
in parallel. He uses the same battery for the investigation.
State whether the current, the voltage across each filament and the total power produced
increases, decreases or stays the same when the two filaments are connected in series.
current ...............................................................................................
voltage ...............................................................................................
power ................................................................................................
[2]
Subjective
Total marks:330

7. (c) Fig. 8.2 shows the current–voltage graph for the two filaments.
0
0
0.5
1.0
1.5
2.0
2.0 4.0 6.0 8.0 10.0
voltage/V
current/A
12.0
Fig. 8.2
(i) Calculate the total resistance of the two filaments when they are connected in parallel to
a voltage of 12V.
resistance = ......................................................... [3]
(ii) The two filaments are made from the same type of metal and have the same length,
when uncoiled. They both operate at the same temperature.
Suggest why one filament has a resistance that is greater than that of the other filament.
...........................................................................................................................................
..................................................................................................................................... [1]

8. (d) Fig. 8.3 shows a relay used to switch on a car headlamp.
pivot
S
H
iron armature
flexible contacts
iron core
coil of high resistance
relay
Fig. 8.3
Explain why headlamp H lights up when switch S is closed.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................. [4]
[Total: 15]

9. 2 Ultrasound and X-rays are both used in medical imaging.
(a) (i) Define what is meant by ultrasound.
...........................................................................................................................................
..................................................................................................................................... [2]
(ii) Describe what happens to ultrasound waves as they meet the boundary between two
different materials.
...........................................................................................................................................
..................................................................................................................................... [2]
(iii) To produce the image of an unborn child, an ultrasound emitter and receiver are placed
close together on the mother’s skin.
Fig. 9.1 shows pulses detected by the receiver.
0 0.02 0.04 0.06 0.08
A
B
time/ms
Fig. 9.1
Pulse A is the emitted pulse and pulse B is the first pulse that returns from the unborn child.
The average speed of ultrasound in human tissue is 1500m/s.
Calculate the distance between the emitter and the child.
distance = ......................................................... [3]
(iv) The speed of ultrasound in human tissue is close to the speed of sound in water.
Suggest approximate values for the speed of sound in gases and solids.
speed in gases ..................................................................................................................
speed in solids ..................................................................................................................
[2]

10. (b) Fig. 9.2 shows an X-ray image of a hand. An X-ray detector is placed just below the hand.
An image of the bones and human tissue around the bones is formed on a screen by the
detector.
screen
Fig. 9.2
(i) Describe what happens to the X-rays to produce the image.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
..................................................................................................................................... [3]
(ii) The wavelength of the X-rays used is 2.0 × 10−9 m. The speed of electromagnetic waves
is 3.0 × 108 m/s.
Calculate the frequency of the X-rays.
frequency = ......................................................... [2]
(iii) Suggest one reason why X-rays are not used to form an image of an unborn child.
...........................................................................................................................................
..................................................................................................................................... [1]
[Total: 15]

11. 3 A student investigates the effective resistance of different combinations of three identical resistors.
She sets up circuit 1, shown in Fig. 3.1.
circuit 1
Y
X
A
V
Fig. 3.1
She measures and records the current I in the circuit and the potential difference V across the
resistor combination.
Fig. 3.2 shows part of the scale of the voltmeter.
1.5
1.4
V
Fig. 3.2
(a) Read the voltmeter scale shown in Fig. 3.2. Record your answer on the answer line and in
Table 3.1 on page 8.
voltmeter reading = ...................................................... V [1]
ATP
Total marks:

12. (b) The student uses two more combinations of the three resistors. The combinations are shown
in Fig. 3.3.
circuit 2 circuit 3
Fig. 3.3
She replaces the resistor combination shown between X and Y in circuit 1 with that of circuit 2
and then that of circuit 3, in turn.
Each time she records the current I in the circuit and the potential difference V across the
resistor combination.
Her results are shown in Table 3.1.
Table 3.1
circuit V/............... I/............... R/...............
1 0.13
2 1.46 0.25
3 1.46 0.58
The resistance R of each combination of resistors is given by
R = V/I
[3]
(i) Complete the column headings in Table 3.1.
(ii) Calculate the resistance R of each combination of resistors.
Record the values of R in Table 3.1. [4]
(c) Theory suggests that for identical resistors, the resistance of the resistor combination in
circuit 1 is double the resistance of the resistor combination in circuit 2.
State whether your results support this theory, within the limits of experimental accuracy. Give
a reason for your answer.
...................................................................................................................................................
............................................................................................................................................. [1]
(d) Give one precaution that the student takes so that her readings of current and voltage are as
accurate as possible.
...................................................................................................................................................
............................................................................................................................................. [1]
[Total: 10]

13. 3 A student investigates how the resistance of a filament lamp changes as the potential difference V
across it changes. He uses the circuit shown in Fig. 3.1.
Fig. 3.1
(a) On Fig. 3.1, draw the symbol for an ammeter and the symbol for a voltmeter in the correct
positions for this investigation. [2]
(b) The student takes two different sets of readings of current and potential difference.
(i) Suggest how he adjusts his circuit to do this.
...........................................................................................................................................
..................................................................................................................................... [2]
(ii) He adjusts his circuit so that the voltmeter shows 4.0V and he reads the ammeter. He
repeats the experiment at 8.0V.
Fig. 3.2 shows the readings of current I on the ammeter for each voltage.
0
0.50 1.50
2.0
1.0
A
+
when V = 4.0V
0
0.50 1.50
2.0
1.0
A
+
when V = 8.0V
Fig. 3.2
Record the values of I shown on the meter for each voltage.
When V is 4.0V, I = ............................................................ A
When V is 8.0V, I = ............................................................ A [2]

14. (iii) Use the equation:
V
I
R =
to calculate the resistance R of the lamp at 4.0V and at 8.0V.
State the unit in your answers.
V is 4.0V, R =
When ...............................................................
V is 8.0V, R =
When ...............................................................
[2]
(c) State two physical changes in the lamp that are observed as the potential difference V is
increased.
1 ................................................................................................................................................
...................................................................................................................................................
2 ................................................................................................................................................
...................................................................................................................................................
[2]
[Total: 10]