Final Examination Coverage and Revision Exercise Answers

Kowloon Tong School (Secondary Section)

F. 2 Integrated Science

Final Examination Coverage and Revision Exercise

Name: _______________________(    )                                    Class: Form 2 _____________      

Exam Coverage

Textbook	Workbook	Worksheet
9.1 Forces (P.3 - 9)	P.1 – 24; P.5 9.4A Q.1 – 3, 5; P.6 9.4B Q.1; P.7 - 9 9.4B Q.4 – 6; Integrated Exercise related to topics 9.1 – 9.4B1	9.1 – 9.3
9.2 Friction (P.10 - 21)
9.3 Force of gravity (P.22 - 25)
9.4 B1 Action and reaction (P.28 - 32)
10.1 Acids and alkalis in daily life (P.67 - 70)	P.25 – 35; Integrated Exercise related to topics 10.1 – 10.5	10.1 - 10.5
10.2 Acids and alkalis in the laboratory (P.70 - 72)
10.3 Acid-alkali indicators (P.72 - 85)
10.4 Acids and corrosion (P.86 - 91)
10.5 Acid rain (P.91 - 98)
11.1 Senses and sense organs (P.141 - 145)	P.61 – 72; Integrated Exercise related to topics 11.1 – 11.4	11.1 – 11.4
11.2 How we see (P.145 - 155)
11.3 Limitations of eyes (P.156 - 160)
11.4 Eye defects (P.160 - 170)

Part A: Fill in the blanks / Fill in the tables

1.        A force can:

n   (1)start the motion of an object;

n   stop the motion of an object;

n   change the (2)speed / direction / shape of an object;

n   change the (3)speed / direction / shap of an object.

2.    Force can be measured by a (4)spring balance. The unit of force is (5)Newton (N).

3.    (6)Contact forces are forces that act on objects through direct contact;

       (7)Non-contact forces are forces that act on objects without direct contact.

4.    (8)Friction:

n   is a force that (9)opposes the sliding motion of objects;

n   is a contact force as it acts along the (10)contacting surfaces of two objects;

5.    Air (or water) (11)resistance opposes the motion of objects moving through air (or water).

6.    Friction can be reduced by:

n   creating an air (12)cushion which separates the contacting surfaces;

n   adding a (13)lubricant between two surfaces;

n   using (14)rollers such as wheels and ball (15)ball bearings.

7.    Air or water resistance can be reduced by using designs with (16)streamlined shapes. 

8.    The force of (17)gravity:

n   is the (18)pulling force exerted by the Earth on every object on or around it;

n   is also exerted by other celestial bodies;

n   is an example of (19)non-contact forces as it acts on objects without contact;

9.   

	The (20)weight of an object	The mass of an object
meaning	the force of gravity exerted on the object	the amount of (21)matters it contains
is measured in	(22)Newton (N)	Kilograms (kg) or grams (g)
occurrence	Different in different celestial bodies	Same in all places

10. 

	(23)Acids	(24)Alkalis
taste	sour	bitter
feel	--	(25)Soapy of slippery
pH	smaller than 7	greater than 7
examples	l  (26)hydrochloric acid l  sulphuric acid l  nitric acid	l  (27)sodium hydroxide l  potassium hydroxide l  ammonia solution
hazards	Either irritant or (28)corrosive

11.  An acid-alkali (29)indicator shows different colours in acids and alkalis and can be used to distinguish acids from alkalis.

12.  The extracts of some deeply coloured plants can be used to make (30)natural acid-alkali indicators as they show different colours in acids and alkalis.

13. 

(31)Litmus paper	Red	Blue
Colours in acids	(31)red	(32)red
Colours in alkalis	(33)blue	(34)blue
Colours in (35)neutral substances such as distilled water	red	blue

14.  Litmus can only be used to test whether a substance is acidic, (35)alkaline or neutral.

15.  (36)Universal indicators can show the (37)degree of acidity and alkalinity.

       It is available in solution and paper form. Its paper form is called (38)pH paper.

16.  The degree of acidity and alkalinity can be measured in terms of (39)pH vlaues.

17.  The scale for measuring acidity or alkalinity is called (40)pH scale ranging from 0 to 14:

18.  Dilute acids react with some metals to produce (41)hydrogen and heat. Acids also have

       (42)corrosive effects on these metals.

19.  Hydrogen burns in air with a (43)‘pop’ sound.

20.  Some building materials such as marble and limestone contain (44)calcium carbonate,

       which are corroded by acids and give off (45)carbon dioxide_.

21.  Carbon dioxide turns (46)lime water milky.

22.  (47)Acid rain has a pH value lower than 5.6. It is mainly caused by the acidic

       pollutant gases like (48)sulphur dioxide and (49)nitrogen oxides,

       which are released from traditional (50)power station, factories and motor vehicles.

23.  Acid rain can (51)corrode buildings and structures made of metals, marble and limestone.

       It can damage plants by making plants unable to carry out (52)photosynthesis and also kill water life.

24.  To reduce the emission of acidic pollutant gases, we should use more alternative energy sources

       like (53)solar power and wind power. Motor vehicles should use (54)catalytic converter

       to reduce pollutants from the exhaust gas.

25.  Living things can detect and respond to (55)stimuli in their environment.

26.  We have different (56)sense organs to detect different stimuli, leading to various senses:

Sense organ	Stimuli	Senses produced
(57)Eye	light	(58)sight
ear	(59)sound	hearing
nose	(60)chemicals in air	(61)smell
(62)tongue	chemicals in food and drinks	taste
(63)skin	things in contact with our body	heat/cold, touch, pain and pressure

27.   The (64)lens focuses the light entering the eye from an object to form a (65)sharp image

on the retina.

28.   The iris controls the size of the (66)pupil and hence the amount of light entering the eye:

Condition	Bright light	Dim light
Size of pupil	(68)smaller	(69)larger
Amount of light entering the eye	less	more

29.  There are two types of (70)light receptors on the retina:

n   (71)Cones can detect colours but they only work well in bright light.

n   (72)Rods cannot detect colours but can work well in dim light.

30.  Limitations of our eyes

We cannot see objects clearly when they are:	suitable (73)instruments to overcome
too (74)close	--
too far away	(75)telescope
too (76)small such as micro-organisms	(77)microscope

31.  Light from objects focused on the (78)blind spot produces no sense of sight.

32. 

Eye defects	(79)short sight	(80)long sight
Can see	Near objects clearly	Distant objects clearly
Cannot see	(81)distant object clearly	(82)near object clearly
Causes	The lens is too (83)thick. The eyeball is too long.	The lens is too thin. The eyeball is too (84)short.
Corrections	Spectacles with (85)concave lens	Spectacles with convex lens

Eye defects	(86)Cataracts	(87)Colour-blindness
Problems	Vision becomes cloudy	Cannot distinguish between certain colours
Causes	Lens becomes too (88)cloudy.	Defects in or the absence of certain (89)cones.
Corrections	Replace the cloudy lens with an (90)artificial lens	Cannot be cured

Part B: Label the diagrams

1.      Write down the correct name of the structure in the space provided.