Download Second Term Test

KWUN TONG GOVERNMENT SECONDARY SCHOOL
SECOND TERM TEST, 2003-2004
Form Two Integrated Science
Class
: S.2 (
)
Date
: 3-5-2004
Name
: _______________________
Time
: 8:35-9:05am
Class No.: ________
Full Mark : 50
ANSWER ALL THE QUESTIONS ON THE ANSWER SHEET PROVIDED
(A)
Multiple Choice (10 marks)
1. What does the following circuit symbol represent?
A.
2.
Fuse
B.
Light bulb
C.
Resistor
D.
Switch
Two identical resistors are connected in series. If the current flowing through
point X is 0.1 A, what is the current flowing through point Y?
A.
3.
0.05 A
B.
0.1 A
C.
0.2 A
D.
0.4 A
Normally every wire has a resistance, though very small. This causes an energy
loss during transfer, as electrical energy changes into
A.
sound energy.
B.
potential energy.
C.
heat energy.
D.
chemical energy.
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4.
Which resistor in the following circuit draws the largest current?
A.
5.
6.
X
B.
Y
C.
Z
D.
All are the same
Label the holes X, Y and Z.
X
Y
Z
A.
Live
Earth
Neutral
C.
Earth
Live
Neutral
X
Y
Z
B.
Live
Neutral
Earth
D.
Earth
Neutral
Live
Which of the following can indicate the pH value of a solution?
A.
Universal indicator
B.
Ammonia solution
C.
Red cabbage extract
D.
Litmus solution
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7.
8.
Which of the following is a short circuit?
A.
B.
C.
D.
Which of the following parts of our body produces acid?
A.
9.
Eyes
B.
Lungs
C.
Mouth
D.
Stomach
Which of the following statements about pH scale are correct?
I
It values from 1 to 14.
II
The pH value of a neutral solution is 7.
III
pH value 14 indicates strong acid.
A.
I and II only
B.
I and III only
C.
II and III only
D.
All of them
10. Which of the following parts of the eye help(s) focus light onto the retina?
I
Cornea
A. III only
II
Optic nerve
B. IV only
III
Lens
C. I and III only
IV Pupil
D. I, II and IV only
(B)
True or False Statements (5 marks)
Write ‘T’ for a true statement and ‘F’ for a false one.
1. The current flows through a short circuit is larger, because the distance it travels
becomes shorter.
2. A fuse should be connected to live wire.
3. Using ring mains circuit can prevent overloading.
4. A chemical with higher pH value is more acidic.
5. Blind spot has no light sensitive cells.
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(C)
1.
2.
3.
4.
5.
(D)
Matching (5 marks)
Column A
Live wire
A.
Conductor
B.
Fuse
C.
Calcium oxide
D.
smell
E.
F.
G.
H.
Column B
A material that electric current cannot pass through
A material that electric current can pass through
An example of alkali
An example of acid
Blue
Brown
A short piece of metal wire that will melt if the
current is too large
Nose
I.
Tongue
Fill in the blanks (10 marks)
1.
An ammeter is connected up in (a) __________
to measure the (b) __________.
2.
(c) ________is the opposition to the flow of the electric charges. Its unit is (d) _____.
3.
A (e) ________ has a variable resistance. Volume control is an example that makes
use of it.
4.
The reaction between an acid and an alkali is called (f)
reaction, (g)
and (h)
. In this
are produced.
5.
The (i)
in the sense organs detect stimuli.
6.
Humans have (j)_________ sense organs for detecting the environment.
(E)
Short questions (20 marks)
1. The following table shows the operating currents of three electric
appliances.
Operating current
electric kettle
electric iron
air conditioner
5A
4.5A
10A
If these appliances are connected to the same 15A fused socket and they are
switched on together, what will happen to the fuse? Why? (4 marks)
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2.
Find out the position of the sliding contact of the rheostat at which the bulb will be
the brightest. Give a reason for your answer. (3 marks)
B
C
A
3.
All the light bulbs in the following circuit are identical.
A
0.2 A
B
0.1 A
(a)
(b)
(c)
(d)
Which bulb is the brightest when the circuit is closed? (1 mark)
Draw in the diagram to show how to measure the voltage of bulb B. (1 mark)
Calculate the total amount of current being drawn from the battery. (1 mark)
If bulb B burns out, what happens to bulb A? (1 mark)
4. 10 pieces of apple are kept in (A) a beaker of water and (B) a beaker of vinegar
respectively for a week. The results are recorded as follows.
(a)
(b)
(c)
(d)
Beaker
Results
A
Apple pieces turn bad
B
Apple pieces are still fresh
Which liquid can preserve apple? Why? (2 marks)
What is the conclusion of this experiment? (2 marks)
State 2 advantages of preserving food with acid. (2 marks)
Suggest 3 other methods of preserving food. (3 marks)
END OF PAPER
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