turned blue-black. This shows that the
food contains:
A. fat
B. mineral
C. proteins
D. vitamins
E. starch
JS 3 BASIC SCIENCE PRACTICE
QUESTIONS.
1.
2.
3.
4.
5.
6.
What is the molecular mass of 2 moles
of H2SO4? (H=1, S=32, O=16)
A. 196
B. 152
C. 49
D. 32
E. 24
Which of the following statements
about red blood cells is NOT correct?
A. Each cell contains haemoglobin
B. New red cells are made in the
spleen
C. They remove carbon dioxide from
the cells
D. They carry oxygen to the cells
E. They do not live very long
A screw is a type of:
A. complex machine
B. gear
C. inclined plane
D. pulley
E. lever
The number of protons in the nucleus of
an atom is called its ___ number.
A. electron
B. atomic
C. molecular
D. nuclear
E. mass
The bending of light rays as they pass
from one medium to another is called:
A. deflection
B. deviation
C. dispersion
D. reflection
E. refraction
Drops of iodine were added to a piece
of food and the colour of the food
7.
Which of these classes of food is best
for body building?
A. Protein
B. Carbohydrates
C. Fats
D. Vitamins
E. Water
8.
The pin-hole camera works on the
principle that light:
A. can be absorbed
B. can be reflected
C. is a form of energy
D. travels in a straight line
E. can be transmitted
9.
Which of the following is the abiotic
factor in an aquarium?
A. Bacterium
B. Fish
C. Snail
D. Spirogyra
E. Water
10.
At what temperatures will pure water
boil?
A. 0° C
B. 37° C
C. 100°
D. 111°
E. 180°C
Which of the following substances is
NOT an element?
A Silver
B. Gold
C. Mercury
D. Water
E. Iron
11.
E. Calcium hydroxide and oxygen
12.
13.
14.
15.
Which part of the blood is mainly
water?
A. White blood cells
B. Platelets
C. Red blood cells
D. Plasma
E. None of the above
Current is measured with a/an:
A. ammeter
B. voltmeter
C. voltameter
D. ohmmeter
E. resistor
We experience day and night on the
earth because:
A. the earth is spinning
B. the earth is tilted
C. the earth is round
D. the moon orbits the earth
E. the sun orbits the earth
What forces hold the solar system
together?
A. Frictional
B Magnetic
C. Electrical
D. Gravitational
E. Electromagnetic
16.
Which of these metals will burn most
fiercely?
A. Silver
B. Iron
C. Zinc
D. Copper
E. Magnesium
17.
Name the products made when
calcium reacts with water.
A. Calcium carbonate and water
B. Calcium hydroxide and hydrogen
C. Calcium carbonate and hydrogen
D. Hydrogen only
18.
Which of these substances does NOT
stop iron from rusting?
A. Paint
B. Oil
C. Water
D. Grease
E. Plastic coating
19.
What are the horizontal rows in a
periodic table called?
A. Rows
B. Groups
C. Periods
D. Metals
E. Groups 2
20.
What do the arrows in a food chain
show?
A. Chemical reactions
B. Passing of time
C. Direction of movement
D. Transfer of food energy
E. Energy dissipation
21.
Which of these is the least reactive
among the group VII elements (the
halogens)
A. Chlorine
B. Iodine
C. Fluorine
D. Bromine
E. Astatine
22. The physical property used to achieve
separation in distillation is --------A. Solubility
B. Difference in boiling point
C. Difference in melting point
D. Density
E. Temperature
23. The name given to the process whereby
a heated solid substance changes to the
gaseous state without passing through
the liquid state is called
A. Chromatography
24.
25.
26.
27.
28.
B. Distillation
C. Sublimation
D. Crystallization
E. Filtration
Which of the following will not
increase the rate of a chemical reaction?
A. Increase in reactant concentration
B. Increase in the temperature of the
reaction
C. Increase in surface area of the solid
reactant
D. Increase in particle size of the solid
reactant
E. Addition of a catalyst
Gaseous substances can be compressed
to a smaller volume because,
A. The particles are far apart from each
other
B. The particles are very close each
other
C. The particles collide rapidly
D. The particles are in a fixed position
E. The particles slide over one another
What is the name given to a group of
cells that are similar in structure and
perform the same function?
A. Organ
B. Organ system
C. Tissue
D. Level of organization
E. Organism
The organ of smell in human is the -------A. Nose
B. Olfactory lobes
C. Lungs
D. Liver
E. Skin
The digestive end products of fats and
oils are
A. Glucose
B. Amino acids
C. Fatty acids and glycerol
D. Lipids
E. Vitamins
29.
30.
Which of the following enzymes are
found in the mouth?
A. Pepsin
B. Rennin
C. Ptyalin
D. Gastric juice
E. Amylase
The name of the organelle that is
referred to as the power house of the
cell is the ------A. Mitochondria
B. Nucleus
C. Ribosome
D. Cell membrane
E. Protoplasm
JS 3 BASIC SCIENCE PRACTICE
QUESTIONS
1. The most reactive metal is
A. Sodium
B. Zinc
C. Potassium
D. Copper
E.
Boron
2. A solution with a pH value of 8 is
A. A strong acid
B. Amphoteric
C. A strong alkaline
D. A weak alkaline
E. A weak acid
3. Which compound is formed when one
atom of nitrogen combines with three
atom of hydrogen
A. Ammonia
B. Carbon dioxide
C. Caustic soda
D. Common salt
E. Water
4. The following methods can be used to
purify water except
A. Boiling
B. Crystallization
C. Distillation
D. Filtration
E. Sedimentation
5. A chemical reaction that gives off heat
energy to the surroundings is called
A. Acidification
B. Concentration
C. Endothermic
D. Exothermic
E. Neutralization
6. Which of the following sets of materials
do plants use to manufacture food?
A.
Calcium, oxygen and energy
B.
Hydrogen , nitrogen and heat
C.
Water, carbon and sunlight
D. Water, carbon (iv) oxide and
energy
E.
Water nitrogen and heat.
7. The primary source of energy in an
ecosystem is
A. Water
B. The sun
C. Chlorophyll
D. Plant
E. An animal
8. Anaemia is a blood disease which is
caused by having ____ in the body.
A. Insufficient red blood cells
B. Insufficient white blood cells
C. Too much red blood cells
D. Too much white blood cells
E. Too much water
9. Which of these abnormalities is NOT
genetic?
A.
Albinism
B. Colour blindness
C.
leukaemia
D. Sickle cell
E.
Haemophilia
10. Which of the following represent the
development of egg in the female after
fertilization?
A.
Eggembryofoetuszygote
B. Eggembryozygote foetus
C.
Eggfoetusembryo zygote
D. Eggfoetuszygoteembryo
E.
Eggzygoteembryofoetus
11. The transfer of heat energy by the
movement of water molecules is called
________
A. Condensation
B. Conduction
C. Convection
D. Evaporation
E. Radiation
12. The energy possessed by a mango fruit
that falls from a height before it hits the
ground is ____ energy.
A. Heat
B. Kinetic
C. Nuclear
D. Potential
E. Sound
13. Calculate the power of a pump which
can lift 50 kg of water through a
vertical height of 12m in 3 minutes.
Assuming g =10 m/s2
A. 33.33 watts
B. 42.15 watts
C. 52.67 watts
D. 62.27 watts
E. 72.57watts
14. A body of mass 10kg is released from a
height of 20m above the ground.
With what gravitational force does the
body strike the ground? (given that
g=10m/s2)
A. 20N
B. 100N
C. 25N
D. 120
E. 10N
15. A screw thread is used in the following
ways EXCEPT
A. Screw jack
B. Holding wooden doors
C. Holding wood together
D. Sweeping of the floor
E. Boring hole in wood and metal
work.
16.The following are examples of reflex action
EXCEPT
A. Sneezing
B. Coughing
C. Talking
D. Yawning
E. Blinking
17. A machine has a velocity ratio of 4 and
is 75 % efficient. Calculate its
mechanical advantage.
A. 0.16
B. 1.40
C. 3.00
D. 4.00
E. 1.80
18. The following compounds are formed
by electron transfer EXCEPT
A. Sodium chloride
B. Calcium oxide
C. Zinc iodide
D. Nitrogen dioxide
E.
Iron oxide
19. Absorption of digestive end products in
the digestive system takes place in the
A. liver
B. stomach
C. Large intestine
D. Small intestine
E. mouth
20. Which of these gases is not a
constituent of air?
A. Carbon (iv) oxide
B. Hydrogen
C. Nitrogen
D. Noble gases
E. Water vapour
21. The force applied to the lever to do the
work is called
A. load
B. effort
C. fulcrum
D. pivot
E. Friction
22. The unit of force is …………..
A. Newton
B. Metre
C. Newton-metre
D. meter per second
E. Kilogramme
23. In the eye images are formed on the
A. Iris
B. Pupil
C. Retina
D. Cornea
E. Sclera
24. A block of material is 8m long, 2m wide
and 3m high, and has a mass 48kg. What is
its density?
A. 1kg/m3
B. 3kg/m3
C. 5kg/m3
D. 6kg/m3
E. 4kg/m3
25. What is the moment of a 15N force acting
on a crowbar 4m from the fulcrum?
A. 20Nm
B. 15Nm
C. 60Mn
D. 50Nm
E. 12Nm
26. The two main parts of the central nervous
system are__________
A. Grey and white matter
B. Brain and spinal cord
C. Cerebrum and cerebellum
D. Mid brain and hind brain
E. Sensory and motor
27. Gastric juice is found in the _____
A. Bile
B. Liver
C. Mouth
D. Pancreas
E. Stomach
28. The part of the ear responsible for
balancing is
A. Auditory nerve
B. Cochlea
C. Eardrum
D. Pinna
E. Semi-circular canal
29. All these are micro-organisms except
A. Bacteria
B. Amoeba
C. Virus
D. Spirogyra
E. Plasmodium
30. An example of an insect that exhibit
complete metamorphosis is
A. House fly
B. Ant
C. Termite
D. Cockroach
E. Spiro