人工育教 真三第張十第6日一廿月二十年午戊夏
WAH KIU YAT PO
報日僑
五期星
1979
placed 30 cm in front of
16.
中學會考試題預習專欄
物理
(十五)
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convex lens of facal length 20cm. ▲ concave lens of focal length 20 cm is placed. 10cm behind the convex lens za
shown in figure.
B. 18
C. 34
D. 8/2
E. 12√2
PHYSICS (15)
TEST EIGHT HEAT, LIGHT
SOUND AND WAVE MOTION.
•(~)
・object
Conver Concame
Lew
Lear
日九十月一年九七九一瑟公年八十六國民中
B. X gains $20 on the
transaction
Y loses $10 on the transation.
D. X makes no profit the transation
E. none of the abov
is true.
B. TXG-1
C. TấG #constant
DT
ETG
15. When,
by.
-2x+1 is divided
the remainder
4. In the figure, a circle,
centre 0, touches the sides of a quadrilatual. Which of the following is not true?
The value of 0 is cos(0-30)o-sin(20+60) °
A. 90. B. 60
C45
D. 30
is
11
B.1
10
E. 13.
Figure
Figure 1 shows a right-angled
the angles at A glass prism, a
and C are 30 and 60 respect- ively. The face AB is silvered, It is found that when a ray er light incident on the face AC at an angle of 50, it will retrace its path after refleo- tion, What is the refractive
index of gli
· (b)
As shown in figure 2, if ray of light incident on the face BC at an angle 50°,
find the deviation of
if it emerges from AGD
In an experiment to deter-
mine the focal length of
convex lens, a plane mirrer and en illuminated object are
used.
(a) By sketching a ray diagram, describe how the focal length of the convex lens can be determined
(b) It is found that the lumi nated object coincidea, with its image when it is placed
20 cm from the lens, deter
mine the fecal length of the
Tene,
Find the size, nature and
position of the image.
40(a) A steel wire emite
fundamental note of freq- uency 150Hz when the tension
is 18N.
(1) What is the frequency
if the tension is 5ON:
(11) To what value must the
tension be altered to
duce a note of frequenc
200HS.
(b) Two steel wires A and
B are vibrating at their fundamental nodes. It the ratio of their lengths is
32, the ratio of their
tensions 18 4:1 and the
ratio of their diameters is
21,
(1) find the ratio of their
fundamental frequencies, (11) If wire & is shortened by 10 om, then the twe
notes are in unison, find
the original lengths of
and B.
A, PQRS is cyclic
B. POQ + ZROS # 180°
C. £P ¿Q +ZR +LS #360 D. Oq bisects PQR
E. PQRS » PS + QR
5. The sides of a triangle are in the ratio 3:4:5, them
the angle are in the ratio 3:4:5
the angle are in the ratio sin3*;sin4:sin5o
C. the triangle is acute-
angled
D. the triangle is right.
angled
E. the triangle is obtus
angled,
6. The valve of ten
+tan 30°c
E.
2
cos 30° is 28
In the figure, ABF, DCE, ADF and BCF are straight lines. KF and KE are bisectors of AFB and DEA.
FKE equals
(十五)
1375°
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Mathematics 15
Exercise 7 Multiple choice problems
1. Let a,b,c, be the length of
3 line segments, then the neccessary and sufficunt condition for a,b,c, to form a triangle is A. #<b>c,c«■>b
2./2
a-b>c, c-acb
D. a+b>c, a−b<c
2
The value of 1021og
A.
B.
D. 11
90.0
10.The value of the
350/0.07203
65.5 x 7.489
A is less than 0:1
on
B. lies between 0.1 and 0.3 C. lies between 0.3 and 1. D. lies between 1 and 3
is greater than 3.
In the figure, PQRS 18 parallelogram and
GM - ¿MB, QN=4NP. Area of AMSN
Area of PQRS
E.
50
16. If
(x+1)=x=x+1- identity, then the values of P and ◊) are respective-
17. If the equation «x +bx+c=
has 2 unequal real roots then
A. b48c
B.
4ac
C. bac
D.
ac
bhac
18. If sing+cose-x, then singcose is equal to
12. In the figure, what is the
length fo BC ih c=?
19. In the figure, the sum of
the five-marked angles is
10cm
10cm
A. 180°
A. 10ain20
120 D135
B. 10tan28
C. 10sine
can not be determined
D. 20sinë.
☆
E. 20sin20.
In the figure, OPQH is a rectangle inscribed in a quadrant 0AB, centre 0. If OR=5cm and RB-8cm, Find the area of the rectangle in aq.cm,
C. 540° D. 720
E. can not be determined
20. Which of the following
statements is always true?
sin tan 9-1
cos estan 0-1
Sin 20+cos 0=1.
A. 25
B. 40
65
Q
B
ΡΑ
sin
30-1
sin 30
-236-0.
3. An object of size 2
五場懷
新團
3. (3+√2)2+(3−2√2) i
落身體驗一
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-TA
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is equal to
An article which cost $100
for
X to make, sells to Y at a profit of 10% and Y re-sells it back to X at a loss of 10%, then
A. X gains $10 on the
transaction.
工你
處 作
勞工處介紹職業
| 四庭,年出卄i至卅五,在新商品工
接生心名 女性,月薪七百七十元。
(新按址往勞工處登記)
踏上
更
多正於期而
崩途翠歡設 靈性 郊在
友發 樂樂,
光
none of the above.
If T varies directly as R
and R varies inversely as
the relation between
and G is
-3
T<G
裕田
Answer;—1, D 6. C 11 A 16, C
2. C 7. B 12, D 17. A 3.C 8. E 13. D 18. E 4. A 9. E 14. C 19. A 5. D10. B 15. E 20. D
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