# PHYSICS � YEAR 11 �EXAMS PAPERS

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```					PHYSICS – YEAR 11 –EXAMS PAPERS
Preliminary Examination 2001 - BIRRONG GIRLS HS

1. When measuring the intensity of light using a luxmeter, a student measures the intensity as
X units at a distance d from the source. The student then doubles the distance between the
source and the luxmeter. The reading now should be :

(A) X                  (B) 2X                 (C) X/4                        (D) 4X

2. A light bulb has the following information written on it :
Phillips
60W - 240V
From this the current flowing through the lamp during normal operation would be
(A) 4A                 (B) 0.25A            (C) 14400A                  (D) 10A

3. A bomb, initially at rest, is exploded into three equal pieces. A student is required to
analyse the measurements of the motion and mass of the three pieces after the explosion. The
BEST principle in science to apply to this case would be :

(A) Conservation on Energy                    (B) Conservation of Mass
(C) Conservation of Momentum                  (D) Conservation of Kinetic Energy

4. A current carrying conductor has a current directed into the page as shown below.
Current

The direction of the magnetic field caused by this current is best described as :
(A) Up the page                              (B) Into the page
(C) Clockwise                                (D) Anti clockwise

5. The best example of Newton's First Law of motion is :

(A) The seat pushing against a student with the same force as the student's weight
(B) Two different masses falling to the ground at the same acceleration
(C) A heavy train being harder to move than a light one
(D) A drivers head striking the windscreen of the car during a front on collision.

6. Three identical resistors (of value R ohms) are connected. The total resistance of the
network of three resistors is measured to be 1.5R ohms. From this which of the following
diagrams best shows how the three resistors were connected
7. The Citizen's Band radio (CD radio) uses a frequency of 27 MHz. What is the wavelength
of this radio transmission? 4 A

(A) 11.1 m              (B) 3.7 x 10-8 m        (C) 2.7 x 10-6 m                (D) 3 x 108 m

8. Echoes are reflections of sound waves, and this property is used in different applications.
Depth analysis of a body of water is one such application - SONAR.
In SONAR, which of the following is assumed constant :

(A) The depth of the body of water
(B) The speed of sound waves in water
(C) The nature of the bottom of the body of water
(D) The amplitude of the sound wave in water.

9. A heliocentric model of the solar system is one that has :
(A) The Earth at the centre                   (B) The Sun at the centre
(C) The Sun as a star                         (D) The planets exhibiting retrograde motion.

10. A space ship is travelling with constant velocity in space. It the separates ino two sections
which move apart also with their own (different) constant velocities. From this we can say
that :
(A) Energy cannot be conserved
(B) Kinetic energy only is conserved
(C) Momentum only is conserved
(D) Momentum and Kinetic energy are conserved.

11. A current of 2.0 A is flowing through a current carrying conductor as shown. The point P
is directly below the wire.

.P
The magnetic field at the point P is directed :

(A) Into the page                       (B) Out of the page
(C) To the left                         (D) To the right

12. Air friction is a frictional force and therefore we can say that its direction is :

(A) Always down
(B) Always accelerating the object
(C) Always in the opposite direction of the motion
(D) Always balanced.

Part B : Total marks (44)
13. (a) Define the term "WORK". [1]
(b) If a workman has to lift a 20 Kg bag of cement from the ground to the top of a 10 m wall,
calculate the amount of work done. [2]
14. (a) Explain the steps in charging an electroscope by induction using a positively charged
rod. [3]
(b) What charge is left on the electroscope after it is charged. [1]

15. There are several types of electrical safety device which can be used to increase electrical
safety around the home.

(a) List TWO such devices in common use in Australian homes today. [1]
(b) Choose ONE of these devices and explain its operation (i.e. explain how it operates in an
emergency). [3]

16. An electron is suspended between two parallel capacitor plates as shown below.

A potential difference of 200 V is placed between the plates and the force on the electron due
to the electric field produced exactly balances out the force due to gravity on the electron.

(a) On the diagram above draw in the electric field between the plates, ignore edge effects.[1]
(b) Which plate (top or bottom) must be the positive plate? [1]
(c) If the plates are measured to be 2 cm apart find the strength of the E-field between the
plates. [2]

17. Waves are often used to carry information from one place to another.
(a) What is the major difference between the way electromagnetic and mechanical waves
travel? [1]
(c) Define the following terms :
(i) MODEM                            (ii)Analogue

18. A car (A) is coming towards a crossroads going due East at 30 ms-1. At the same time
another (B) car travelling due South at 20 ms-1 also approaches the intersection.
(a) Draw a diagram of the intersection (with roads going North, South, East, and West) and
the cars themselves. Mark all relevant information on the diagram. Mark the two cars A and B
respectively. [2]

(b) Using the diagram above, or otherwise, calculate the magnitude and direction of the
velocity of car A with respect to a passenger in car B. [4]

19. This question refers to the description written by a student about the motion of an object.
The description is given below.

"The object began 2m in front of me and travelled at 2 ms-1 for the next 3 seconds, away
from me. It then stopped for 5 seconds, and finally came towards me reaching me in a
further 10 seconds”.

(a) Draw a displacement vs. time graph to describe the motion including all headings. [3]
(b) State one time period when the object was undergoing constant velocity. [1]

20. (a) Wave can be of several types. Distinguish between transverse and longitudinal wave
propagation. [1]
(b) The graphs below represent a wave in a spring.

(c) What is the wavelength of this wave? [1]
(d) What is the period of the wave? [1]
(d) Briefly explain why transverse waves cannot be transmitted through a liquid medium. (e)
What is the velocity of the wave? [2]
21. Communications often uses waves which form part of the electromagnetic spectrum.

(a) List THREE different waves which form part of the electromagnetic spectrum. [2]
(b) Describe how information is carried on ONE of the waves which form the electromagnetic
spectrum. [2]
(c) Describe ONE factor that places a limit on the distance that electromagnetic waves can
carry information and how it effects this wave. [2]

22. Define the following terms :
(a) Kinetic Energy. [1]
(b) Potential energy. [1]
(c) Using the concepts of energy, calculate the final velocity of a 4 Kg brick (just before it
strikes the ground) if it free falls under the influence of gravity from a height of 12m. [3]

23. A car of mass 800 Kg is moving at a constant speed of 15 ms-l around a circular track.
The track is banked at an angle of 20° as shown.

(a) Make a sketch of the car below and show the forces acting on it as it moves.[2]
(b) Calculate the weight of the car. [1]
(c) Calculate the component of the weight force acting parallel to the road surface. [3]
(d) State the direction of the resultant force on the car. [1]

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