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WASSCE July 2018 science

OBJECTIVE TEST

1.

The component of white light which is most deviated when light is dispersed is

A.

blue

B.

red

C.

violet

D.

yellow

2.

Which of the following characters in human is sex - linked ?

A.

Baldness

B.

Skin colour

C.

Eye colour

D.

Sickle cell

3.

An example of an abiotic factor in an ecosytem is

A.

altitude

B.

grazing

C.

predation

D.

shading

4.

Alkanoic acid contain

A.

carbon atoms and hydrogen atoms only

B.

carbon atom and oxygen atoms only

C.

carbon atoms, hydrogen atom and oxygen atoms only

D.

carbon atoms, hydrogen atoms and nitrogen atoms only

5.

Which of the following mineral is not needed by crop in large quantities ?

A.

Calcium

B.

Iron

C.

Nitrogen

D.

Phosphorus

6.

A rigid bar that is supported at a point which turning occurs is

A.

lever.

B.

pulley.

C.

wheel and axle.

D.

inclined plane.

7.

One criterion used in the classification of domestic rabbit is the

A.

age.

B.

eye colour.

C.

height.

D.

size.

8.

Which of the following chemical is toxic ?

A.

Potassium cyanide

B.

Sodium hydroxide

C.

Hydrogen peroxide

D.

Calcium oxide

9.

The unit of heredity found in the chromosomes is

A.

centriole

B.

deoxyribonucleic acid

C.

mitochondrion

D.

endoplasmic reticulum

10.

Which of the following element is constituent of brass?

A.

Iron

B.

Magnesium

C.

Tin

D.

Zinc

11.

The process in the hydrological cycle which results in water vapour condensing and fallimg on the earth surface is

A.

evaporation

B.

infiltration

C.

precipitation

D.

sublimation

12.

The centre of gravity of a body is

A.

always at its centre

B.

a point where its total mass is always concentrated

C.

always at its end

D.

a point where it can be supported to be in equilibrium

13.

Which of the following crops is not a root vegetable?

A.

Carrot

B.

Ginger

C.

Lettuce

D.

Onion

14.

The aim of the ring experiment in the a flowering plant is to demonstrate that

A.

water is transported by the phloem

B.

food substances are transported by the phloem

C.

food substances are formed in the stem

D.

water is excreted from the stem

15.

Which of the following properties is associated with ionic compound?

A.

are soluble in organic solvent

B.

conduct electricity in the molten state

C.

have low melting and boiling point

D.

consists of molecules

16.

The sedimentary rock is also referred to as

A.

stratified rock

B.

slated rock

C.

silical rock

D.

separated rock

17.

One similarity of arteries and capillaries is that both have

A.

permeable walls

B.

muscular walls

C.

no valves

D.

large lumens

18.

Which of the following instruments is most suitable for measuring the thickness of razor blade?

A.

Metre rule

B.

Micrometer screw gauge

C.

Vernier callipers

D.

Surveyor's tape

19.

The chemical which is most likely to have highly inflammable hazard symbol in its container is on

A.

ethanol

B.

mercury

C.

ammonium hydroxide

D.

sodium hydroxide

20.

The part of the maize grain which grows into the shoot is the

A.

cotyledon

B.

endosperm

C.

plumule

D.

radicle

21.

An effort of 120N was used to overcome a load of 80N.What is the mechanical advantage of te system?

A.

0.67

B.

1.50

C.

40.00

D.

200.00

22.

Which of the flowering reactions can produce salt and water only?

A.

Na3(aq)+ CH3C00H(aq)

B.

NaOH(aq) + NH3(aq)

C.

NH3(aq) + H2O(l)

D.

NaCl(aq) + AgNO3(aq)

23.

The best way of harvesting hot pepper is by

A.

shaking the plant

B.

handpicking the fruits

C.

allowing the fruits to drop naturally

D.

cutting the fruit with a sharp knife

24.

The area of occupied by a box placed on a table is 2.0m. If the box exerts a pressure of 50 Pa 0n the table, calculate the mass of the box. [g= 10m-2]

A.

2.5kg

B.

10.0kg

C.

100.0kg

D.

1000.0kg

25.

Which of the following substances would have a pH below 7?

A.

Pure water

B.

Milk of magnesia

C.

Wood ash

D.

Lemon juice

26.

Consider the food chain below and use it to answer question 26.

Grass - Earthworm - Frog - Hawk

Which of the organisms is the primary consumer?

A.

Earthworm

B.

Frog

C.

Grass

D.

Hawk

27.

Consider the food chain below and use it to answer question below.

Grass - Earthworm - Frog - Hawk

The organism which contains the least energy is

A.

Earthworm

B.

Frog

C.

Grass

D.

Hawk

28.

In cattle, anaemia, damaged skin and heart-water disease are caused by...

A.

liver-fluke

B.

roundworm

C.

tapeworm

D.

tick

29.

In a simple machine, the force that overcomes the resistance is

A.

effort

B.

effort

C.

load

D.

pivot

30.

A molar solution of KHSO4 contains

A.

80g 0f KHSO4 in 1dm3 of solution

B.

100g of KHSO4 in 100cm3 of solution

C.

120g of KHSO4 in 100cm3 of solution

D.

126g of KHSO4 in 1dm3 of solution

31.

Which of the following functions are associated with mammalian skeleton? It...

I. stores calcium and phosphates.

II. protects vial internal organs.

III. produce red blood cells.

IV. stores proteins.

A.

I and II only

B.

III and IV only

C.

I, II, and III only

D.

II, III and IV only

32.

The most appropriate time to transplant vegetable seedling is

A.

dawn

B.

midday

C.

sunrise

D.

sunset

33.

Rainbow formation is a practical illustration of the light phenomenon known as

A.

dispersion

B.

interference

C.

mirage

D.

reflection

34.

An example of a metalloid is

A.

magnesium

B.

potassium

C.

phosphorus

D.

silicon

35.

Which of the following statements about animals are correct?

I. Movement is quick and visible

II. Chloroplast is absent

III. They have thick cellulose cell wall

A.

I and II only

B.

I and III only

C.

II and III only

D.

I, II and III

36.

The main reason for trimming the side of a vegetable bed is to control

A.

run-off water

B.

leaching of nutrient

C.

breaking of bed

D.

soil erosion

37.

Which of the following observation is a direct consequence of thermal expansion?

Which of the following observation is a direct consequence of thermal expansion?

I. Cracks in concrete slaps

II. Sagging of electric cable

III. Buckling of railway line

IV. Crackling noise from roofing sheets

A.

I and II only

B.

I,II and IV only

C.

II, III and IV only

D.

I, II, III and IV

38.

A solution of volume 500cm3 contains 9.80g 0f H2SO4. Determine its molar concentration.

[S=32, O=16, H=1]

A.

0.10M

B.

0.20M

C.

0.40M

D.

0.50M

39.

A ball and socket joint in the human body does not allow circular

A.

circular movement

B.

side to side movement

C.

up and down movement

D.

gliding movement

40.

The way of controlling endoparasites in cattle is through

A.

rotational grazing

B.

early morning grazing

C.

dipping the animals

D.

spraying the animals with recommended pesticides

41.

An electrical circuit consists of a 2V cell connected to a 5 ohms resistor. Determine the amount of current through the resistor when the circuit is closed.

A.

0.4A

B.

1.0A

C.

2.5A

D.

4.0A

42.

Which of the following hydrocarbons is an alkyne?

A.

C2H2

B.

C2H4

C.

C3H6

D.

C3H8

43.

An example of multicellular organism is

A.

Amoeba

B.

Euglena

C.

Paramecium

D.

Rhizopus

44.

Farmers prefer to grow crops on loamy soils because loamy soils

I. usually contains large amountof plant nutrient

II. protect the crops from injury

III. have equal amounts of clay and sand

IV. hold plants firmly

Which of the statements above is/are correct?

A.

I only

B.

I and II only

C.

I and III only

D.

I and IV only

45.

A precaution that has to be taken when using a liquid-in-glass thermoter is

A.

holding the bulb in hand when is use

B.

taking the readings quickly before thermal equilibrium is attained

C.

ensuring that the bulb is fully immersed in the surface

D.

ensuring that the bulb touches the vessel containing the surface

46.

Soap may itch the skin when it contains excess

A.

acid

B.

alkali

C.

fat

D.

glycerol

47.

The gas in the atmosphere that absorbs ultra violet rays is

A.

carbon(IV) oxide

B.

nitrogen

C.

oxygen

D.

ozone

48.

A soil considered fertile when it

A.

contains a lots of living organism

B.

is highly aerated

C.

has high water retention ability

D.

can support adequate crop yield

49.

The energy possessed by a student on top of a building is

A.

chemical energy

B.

heat energy

C.

kinetic energy

D.

potential energy

50.

Which of the following statements about water is correct? It turns blue anhydrous cobalt

A.

green

B.

red

C.

white

D.

yellow