Becezone | Science 2021 BECE

Objective Test

Question 1

Which of the following substances is a compound?

A. Oxygen
B. Magnesium
C. Water
D. Sodium

Question 2

An atom of an element has a neutral charge because the

A. Protons and electrons are the same particles.
B. Proton number and electron number are the same.
C. Neutron number and proton number are equal.
D. Electron number and neutron number are equal.

Question 3

Which of the following organisms is an ecto-parasite of animals?

A. Fleas
B. Tapeworm
C. Liver fluke
D. Roundworm

Question 4

An atom has 20 nucleons and 9 protons. What is its neutron number?

A. 9
B. 10
C. 11
D. 12

Question 5

Which of the following statements about aerobic and anaerobic respiration is not correct?

A. Water is produced as a by-product in anaerobic respiration.
B. Alcohol or lactic acid is produced in anaerobic respiration.
C. No oxygen is required in anaerobic respiration
D. Very little energy is released in anaerobic respiration.

Question 6

An aluminium cube of side 2 m has a mass 24 kg. Determine the density of the aluminium.

A. 3 kg m-3
B. 12 kg m-3
C. 24 kg m-3
D. 48 kg m-3

Question 7

An example of the process of osmosis is

A. Selective reabsorption
B. Absorption of digested food
C. The spread of petrol scent
D. Gaseous exchange in living things

Question 8

What is the systematic name of the compound CO?

A. Carbon (I) oxide
B. Carbon (II) oxide
C. Carbon dioxide
D. Carbon (IV) oxide

Question 9

Which of the following methods can be used to prevent iron from rusting?

I. Painting

II. Alloying

III. Keeping the iron in a desiccator

IV. Keeping iron in a moist environment

A. I and II only
B. II and IV only
C. I, II and III only
D. II, III and IV only

Question 10

The proper way of maintaining soil structure and fertility is termed as soil

A. conservation
B. depletion
C. profile
D. erosion

Question 11

The instrument that can be used to measure accurately the mass of a substance is

A. bean balance.
B. spring balance.
C. eureka can.
D. measuring cylinder.

Question 12

Which of the following chemical symbols can be used to remove permanent hardness of water?

A. NaHCO3
B. Na2CO3
C. Ca(HCO3)2
D. CaCO3

Question 13

Which of the following chemical symbols is that of an element with seven electrons in the outermost shell?

A. 20Ca
B. 17Cl
C. 10Ne
D. 16S

Question 14

Which of the following statements about the base of a transistor are correct? The base is

I. made very thin

II. made very wide

III. responsible for activating the transistor

IV. made of n-type semiconductor

A. I and III only
B. II and IV only
C. I, III and IV only
D. II, III and IV only

Question 15

Which of the following instruments is connected in parallel across a resistor in an electrical circuit?

A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Galvanometer

Question 16

Which of the following fruits is dispersed by water?

A. Coconut
B. Mango
C. Maize
D. Cocoa

Question 17

A farming system which involves the growing of rice and the rearing of fowls is known as

A. crop rotation.
B. mixed farming.
C. mixed cropping.
D. organic farming.

Question 18

Which of the following activities are cultural practices in vegetable production?

I. Application of fertilizer

II. Harvesting

III. Mulching

A. I and II only
B. I and III only
C. II and III only
D. I, II and III

Question 19

The function of the white blood cells in humans is to

A. produce haemoglobin.
B. ensure blood clot during an injury.
C. produce antibodies to engulf disease-causing organisms.
D. produce digestive enzymes.

Question 20

Mosquito pupa breathes through tubes called

A. trachea.
B. siphon.
C. lungs.
D. gills.

Question 21

An advantage of practicing organic farming is that it

A. increases soil fertility.
B. reduces pest infestation.
C. reduces toxicity levels in plants.
D. increases resistance to plant disease.

Question 22

Which of the following planets is at the center of the solar system?

A. Earth
B. Venus
C. Mars
D. Sun

Question 23

Determine the potential energy of a block of mass 2 kg placed on a building 10 m tall. [g = 10 ms-2]

A. 20 J
B. 50 J
C. 100 J
D. 200 J

Question 24

Which of the following organisms attacks crops in storage?

A. Crickets
B. Grasshoppers
C. Millipedes
D. Weevils

Question 25

One of the properties of acids is that they

A. turn wet blue litmus paper red.
B. have no effect on blue litmus paper.
C. turn wet red litmus paper blue.
D. are neutral to litmus paper.

Question 26

The instrument used to measure potential difference across a resistor is

A. ammeter.
B. barometer.
C. hydrometer.
D. voltmeter.

Question 27

A machine lifts a load of 100 N through a vertical distance of 2 m in 10s. What is the work done by the machine?

A. 50 J
B. 100 J
C. 200 J
D. 400 J

Question 28

A machine lifts a load of 100 N through a vertical distance of 2 m in 10s. What is the power of the machine?

A. 50 W
B. 20 W
C. 10 W
D. 2 W

Question 29

Which of the following elements is a macro-nutrient of plants?

A. Copper
B. Manganese
C. Molybdenum
D. Sulphur

Question 30

When an atom loses an electron, the ion formed is called

A. an anion.
B. a cation.
C. a molecule.
D. a compound.

Question 31

Which of the following chemical equations is balanced?

A. H2 + Cl2 → HCl
B. K2O → K + O2
C. Mg + O2 → MgO
D. 2Na + Cl2 → 2NaCl

Question 32

Purple colouration of leaves of plant is a major symptom of deficiency in

A. Calcium
B. Nitrogen
C. Potassium
D. Phosphorus

Question 33

Which of the following diseases is not a deficiency disease?

A. Scurvy
B. Cholera
C. Beriberi
D. Goiter

Question 34

In an experiment to determine the various particle sizes of soil sedimentation, the particle above clay suspension are

A. Loam
B. Organic
C. Gravels
D. Silt

Question 35

A person urinates more often in the rainy season than in the dry season because

A. more sweat evaporates from the skin.
B. less sweat evaporates from the skin.
C. his kidney works faster
D. he drinks less water.

Question 36

Heat from the sun by

I. Conduction

II. Convention

III. Radiation

A. I only
B. II only
C. III only
D. I, II and III

Question 37

Which of the following machines are complex machines?

I. Tractor

II. Mist blower

III. Sewing machine