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Worksheets

SCIENCE GRADE 8

Total questions: 100

Worksheet time: 55mins

Name
Class
Date
1.

The only non-metal which is liquid at room temperature is

(a)  

2.

The non-metal which is a very good conductor of electricity.

(a)  

3.

Which of the following metals is used for making foil to pack foodstuff?

a)

Aluminium

b)

Mercury

c)

Sodium

d)

Copper

4.

Metals react with oxygen to form:

a)

Basic oxides

b)

Acidic oxides

c)

Neutral oxides

d)

None of these

5.

Sulphur reacts with oxygen to form:

a)

Sulphur nitrate

b)

Sulphur dioxide

c)

Sulphate

d)

Sulphide

6.

The property of metal used for making temple bells is:

(a)  

7.

Metals react with water to form ______gas.

a)

Nitrogen

b)

Oxygen

c)

Hydrogen

d)

Ozone

8.

Which of the following statements is incorrect?

a)

Metals have lustre

b)

Metals are malleable

c)

Metals are good conductors of electricity

d)

Metals are poor conductors of heat

9.

Which of the following metals corrodes easily?

a)

Gold

b)

Silver

c)

Nickel

d)

Iron

10.

A __________reactive metal can displace a ________reactive metal from its salt solution.

(a)  

11.

A sample of gas was found to burn with a pop. Which of the following could have given this result?

a)

Carbon Dioxide

b)

Hydrogen

c)

Nitrogen

d)

Oxygen

12.

An example of metal which can be cut with a knife is (a)   .

13.

Sulphur dioxide dissolves in water to form (a)   .

14.

Magnesium oxide dissolves in water to form (a)   .

15.

Those minerals from which the metals can be extracted conveniently and profitably are called (a)   .

16.

The arrangement of metals in a series in the decreasing order of their reactivity is called (a)   .

17.

When iron is exposed to moist air , a brown reddish coating is deposited on its surface. This process is called (a)   .

18.

(a)   , the hardest natural substance known, is an allotrope of carbon.

19.

Offspring created from a single parent.

a)

asexual reproduction

b)

sexual reproduction

20.

Choose all that apply.

Asexually produced offspring are _____________.

a)

identical to the parent

b)

identical to each other

c)

different than the parent

d)

different than each other

21.

What type of asexual reproduction is shown?

a)

budding

b)

vegetative propagation

c)

binary fission

d)

pollination

22.

Vegetative propagation is a form of asexual reproduction of _____.

a)

plants

b)

fungi

c)

animals

d)

bacteria

23.

What do you call the cell that forms from fertilization?

a)

fertilized egg

b)

sperm cell

c)

zygote

d)

egg cell

24.

What do you call the type of reproduction in which the genetic materials from two different cells combine, producing an offspring?

a)

pollination

b)

sexual reproduction

c)

fertilization

d)

asexual reproduction

25.

What do you call the female sex cell?

a)

egg cell

b)

sperm cell

c)

diploid

d)

haploid

26.

Pairs of chromosomes that have genes for the same traits arranged in the same order are called ___________.

a)

Haploid

b)

Diploid

c)

Homologous chromosomes

d)

Heterogous chromosomes

27.

What do you call the cells that have pairs of chromosomes?

a)

Diploid

b)

Haploid

c)

Sperm cell

d)

egg cell

28.

In this cell division, one diploid cell divides and makes four haploid sex cells. What do you call this special kind of cell division?

a)

mitosis

b)

meiosis

c)

fertilization

d)

pollination

29.

Which of the following is NOT a stage of meiosis?

a)

Prophase

b)

Metaphase

c)

Interphase

d)

Telophase

30.

What do you call the type of asexual reproduction wherein a new organism grows by mitosis and cell division on the body of its parent?

a)

fission

b)

regeneration

c)

budding

d)

cloning

31.

What is the advantage of sexual reproduction?

a)

It requires less energy and time.

b)

It creates offspring that are identical to the parents.

c)

It creates genetic diversity in offspring.

d)

There are no advantages to sexual reproduction.

32.
Which of the following is a disadvantage for sexual reproduction?
a)
a lot of time and energy is required for making gametes and finding mates
b)
offspring can be produced more quickly than by asexual means
c)
the genetic diversity makes organisms respond differently to environmental changes
d)
the offspring are genetically different
33.
If two organisms reproduce sexually, then their offspring will exhibit a genetic makeup that is -
a)
identical to only one parent
b)
identical to all of its siblings
c)
a unique combination of traits
d)
the recessive traits of each parent
34.
When comparing the offspring of sexually and asexually reproducing organisms, we would expect the genetic material (DNA) of the sexually reproducing organism to -
a)
contain fewer mutations
b)
be lesser in quantity
c)
be simpler overall
d)
show more variation
35.
In sexual reproduction the male produces ___ cells.
a)
Malex
b)
Quack
c)
Egg
d)
Sperm
36.
Which of the following best describes meiosis?
a)
It is carried out in all tissues theat require cell replacement
b)
It occurs only in cells in the reproductive structures of an organism
c)
It happens in all of the tissues except the brain and spinal cord
d)
It is the first stage of mitosis
37.
function of mitosis
a)
genetic diversity though sexual reproduction
b)
cell reproduction and general growth and repair
38.

Encloses the cell, it acts like a gatekeeper, allowing some materials to pass through it but not others.

a)

Chloroplasts

b)

Cell Wall

c)

Cell Membrane

d)

Cytoplasm

39.

A gel like fluid that takes up most of the space inside the cell. The organelles are found scattered throughout it.

a)

Chloroplasts

b)

Cell Wall

c)

Cell Membrane

d)

Cytoplasm

40.

Small structures in the cytoplasm that do special jobs.

a)

Nucleus

b)

Ribosomes

c)

Organelles

d)

Vacuoles

41.

Saclike structures that store materials such as water, salts, proteins, and carbohydrates.

a)

Nucleus

b)

Ribosomes

c)

Organelles

d)

Vacuoles

42.

Function of the cell membrane to block the movement of certain sizes, shapes and kinds of particles from entering the cell.

a)

permeable

b)

impermeable

c)

semi-permeable

43.

Function of the cell membrane to allow substances to flow freely through, in and out of the cell.

a)

permeable

b)

impermeable

c)

semi-permeable

44.

Function of the cell membrane to not allow the substance or substances to pass through the membrane.

a)

permeable

b)

impermeable

c)

semi-permeable

45.

Who looked at cork and named what he saw cells?

a)

Anton van Leeuwenhoek

b)

Robert Hooke

c)

Rudolph Virchow

d)

Matthias Schleiden

46.
The organelle that is the control center of the cell.
a)
nucleus
b)
cell membrane
c)
ER
d)
ribosomes
47.
The organelle that allows things in and out of the cell.  Also protects the cell.
a)
nucleus
b)
cell membrane
c)
ER
d)
ribosomes
48.
The jelly-like fluid that supports the organelles in place. 
a)
nucleus
b)
cell membrane
c)
chloroplast
d)
cytoplasm
49.
Which organelle collects sunlight to make sugar during photosynthesis?
a)
Chloroplast
b)
Cell Wall
c)
Cell Membrane
d)
Vacuole
50.
Which organelle is found in both plant and animal cells but is larger in plant cells?
a)
Chloroplast
b)
Cell Wall
c)
Cell Membrane
d)
Vacuole
51.
Which organelle is found in both plant and animal cells and converts sugars into energy?  (the powerhouse of the cell)
a)
Mitochondria
b)
Cell Wall
c)
Cell Membrane
d)
Vacuole
52.

Which two organelles are NOT found in animal cells?

a)

Cell membrane

b)

Cell wall

c)

Cytoplasm

d)

Nucleus

e)

Chloroplast

53.

The cytoplasm and nucleus make up the (a)   .

54.

The shape and the size of the cell is related to its (a)   .

55.

Tisssues make up an (a)   .

56.

Organ systems make up an (a)   .

57.

Robert Hooke discovered cell by observing_______under the magnifying device.

a)

Drop of blood

b)

Onion Peel

c)

Slice of cork

d)

Sample of pond water

58.

Which of the following is/are example of unicellular organism(s):

(I) Amoeba (II) Paramecium (III) White Blood Cell (IV) Hen

a)

Only I

b)

Both I and II

c)

I, II and III

d)

All of them

59.

Identify the Cell shown in the figure

a)

Red Blood Cell

b)

Muscle cell

c)

Nerve cell

d)

Amoeba

60.

In a multicellular living organism, X is made up of Y and Y are made up of cells. What are X and Y?

a)

X-Organ, Y-tissues

b)

X-Organ , Y- Organ System

c)

X- tissue, Y- Organs

d)

X-tissue, Y- Organ Systems

61.

The living substance of the cells is known as

a)

Cytoplasm

b)

Nucleoplasm

c)

Protoplasm

d)

Chloroplast

62.

Plant cells do not have Cell membrane

a)

True

b)

False

63.

The unit of inheritance responsible for the transfer of hereditary characters from parents to offspring is

a)

Nucleus

b)

Chromosomes

c)

Genes

d)

Necleolus

64.

Prokaryotic Cells do not have

a)

Cell membrane

b)

Nuclear membrane

c)

Cytoplasm

d)

Nuclear material

65.

Which of the following differences between plant cells and animal cells is incorrect?

a)

Cell wall is present in plant cells but absent in animal cells

b)

Plastids are present in plant cells but absent in animal cells

c)

Vacuoles are smaller in plant cells but larger in animal cells

d)

All the differences are correct

66.

Which of the following is the best example of an electrical conductor?

a)

tire

b)

steel

c)

plastic

d)

none of the above

67.

Which best briefly summarizes the law of electric charges?

a)

charges always attract

b)

charges always repel

c)

unlike charges attract

d)

unlike charges repel

68.

What kind of circuit is this?

a)

series

b)

parallel

69.

If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?

a)

neutral charged

b)

positively charged

c)

negatively charged

d)

no charges at all

70.

What is this symbol for?

a)

light bulb

b)

wire

c)

cell

d)

battery

71.

Electric current is the flow of _________.

a)

protons

b)

electrons

c)

neutrons

d)

none of them

72.

Carbon is The only non-metal material that can conduct electricity.

a)

true

b)

false

73.

What kind of circuit is this?

a)

series

b)

parallel

74.

Electroplating is based on ___________of an electric current.

a)

Physical effect

b)

Chemical effect

c)

Heating effect

d)

Magnetic effect

75.

Adding common salt to distilled water makes it

a)

Good Conductor

b)

Poor Conductor

c)

No change

d)

Both A and B

76.

Electroplating prevents

a)

electric current

b)

chemical effect

c)

lightening

d)

rusting

77.

Out of the following, which metal is used to electroplate iron to make it shining and rust resistant?

a)

Gold

b)

Chromium

c)

Zinc

d)

Tin

78.

Boojho’s uncle has set up an electroplating factory near his village.

He should dispose off the waste of the factory

a)

in the nearby river.

b)

in the corn field

c)

according to the disposal guidelines of the local authority.

d)

in the nearby pond

79.

Most liquids that conducts electricity are solutions of acids, bases and salts.

a)

True

b)

False

80.

All liquids conduct electricity.

a)

True

b)

False

81.

Polythene is

a)

a conductor

b)

an insulator

c)

semi conductor

d)

none of these

82.

An electric current can produce

a)

heating effect only.

b)

chemical effect only.

c)

magnetic effect only.

d)

chemical, heating, and magnetic effects.

83.

Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory

a)

in the nearby river.

b)

in the nearby pond.

c)

in the nearby cornfield.

d)

according to the disposal guidelines of the local authority.

84.

Which of the following solutions will not make the bulb in Fig 14.2 glow?

(a)

(b)

(c)

(d)

a)

sodium chlorides

b)

copper sulphate

c)

silver nitrate

d)

sugar solution in diluted water

85.
Which of the following liquid is not a good conductor of electricity?
a)
Orange juice
b)
Tap water
c)
Vinegar
d)
Honey
86.

1.An electric current can produce

a)

heating effect only.

b)

chemical effect only.

c)

magnetic effect only.

d)

chemical, heating, and magnetic effects.

87.

When an electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates

a)

the chemical effect of current.

b)

the heating effect of current.

c)

the magnetic effect of current.

d)

the lightning effect of current.

88.

The object to be electroplated is taken as ____________ electrode.

a)

cathode

b)

anode

c)

electrode

d)

none of these

89.

An electrolyte is

a)

a metal

b)

a solution

c)

a liquid that conducts current

d)

all of above

90.

An electroscope is a device which is used to find if an object is

a)

charged

b)

magnetic

c)

free of cracks

d)

Hot

91.

When a glass rod is rubbed with a piece of silk cloth the rod

a)

becomes positively charged while the cloth has a negative charge.

b)

and the cloth both acquire positive charge.

c)

and the cloth both acquire negative charge.

d)

becomes negatively charged while the cloth has a positive charge.

92.

Which of the following is not likely to cause Tsunami?

a)

A major nuclear explosion undersea

b)

Earthquake

c)

Volcanic eruption

d)

Lightning

93.

The outermost layer of earth is called

a)

Crust

b)

Mantle

c)

Inner core

d)

Outer core

94.

Earthquakes can cause

(i) Tsunami

(ii) Landslide

(iii) Floods

(iv) Lightning

a)

(i), (ii) & (iii)

b)

(ii) & (iv)

c)

(ii), (iii) & (iv)

d)

(iii) & (iv)

95.

the process of transfer of charges from a charged object to earth is called

a)

earthing

b)

lightning

c)

charge changing

d)

electron movement

96.

which is not a natural phenomena

a)

cyclone

b)

earthing

c)

thunderstorms

d)

tsunami

97.

the electrical charges generated by rubbing are (a)   .

98.

benjemin franklin has showed lightning in

a)

1725

b)

1527

c)

1752

d)

1572

99.

SUSZA = ....

a)

drought

b)

draught

c)

draft

d)

dirt

100.

The trees were .... in the strong wind.

a)

swifting

b)

swamping

c)

swaying

d)

swapping

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