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Science 6-8 Reviewer

Total questions: 100

Worksheet time: 53mins

Name
Class
Date
1.

What is the chemical symbol for oxygen?

a)

O

b)

Ox

c)

Og

d)

On

2.

Which of these is a mixture?

a)

Water

b)

Salt

c)

Air

d)

Gold

3.

What is the basic unit of matter?

a)

Cell

b)

Atom

c)

Molecule

d)

Compound

4.

Which state of matter has a definite volume but no definite shape?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

5.

What is the process of a liquid turning into a gas called?

a)

Melting

b)

Freezing

c)

Evaporation

d)

Condensation

6.

Which of the following is a physical change?

a)

Burning wood

b)

Rusting iron

c)

Melting ice

d)

Cooking an egg

7.

What is the pH of a neutral solution?

a)

0

b)

7

c)

14

d)

1

8.

Which of these is an example of a solution?

a)

Sand and water

b)

Oil and water

c)

Sugar and water

d)

Mud and water

9.

What is the chemical formula for water?

a)

H2O

b)

CO2

c)

NaCl

d)

O2

10.

Which method is best for separating iron filings from sand?

a)

Filtration

b)

Evaporation

c)

Magnetism

d)

Distillation

11.

What type of substance is formed when two or more elements chemically combine?

a)

Mixture

b)

Compound

c)

Solution

d)

Alloy

12.

Which of the following is an example of a chemical change?

a)

Dissolving sugar in water

b)

Crushing a can

c)

Burning paper

d)

Melting chocolate

13.

What is the process of a gas turning into a liquid called?

a)

Evaporation

b)

Condensation

14.

Which of these is a homogeneous mixture?

a)

Salad

b)

Concrete

c)

Blood

d)

Vinegar

15.

What is the role of a catalyst in a chemical reaction?

a)

To be consumed in the reaction

b)

To slow down the reaction

c)

To speed up the reaction

d)

To change the equilibrium

16.

Which of the following is an acid?

a)

Soap

b)

Baking soda

c)

Lemon juice

d)

Bleach

17.

What is the name of the process where a solid changes directly into a gas?

a)

Melting

b)

Evaporation

c)

Sublimation

d)

Condensation

18.

Which gas is most responsible for the greenhouse effect?

a)

Oxygen

b)

Nitrogen

c)

Carbon dioxide

d)

Hydrogen

19.

What is the chemical formula for table salt?

a)

KCl

b)

MgCl2

c)

NaCl

d)

CaCl2

20.

Which of the following is a base?

a)

Hydrochloric acid

b)

Acetic acid

c)

Sodium hydroxide

d)

Nitric acid

21.

What type of reaction is burning wood?

a)

Endothermic

b)

Exothermic

c)

Isothermic

d)

Sublimation

22.

Which of these separation techniques is used to separate liquids with different boiling points?

(a)  

23.

What is Avogadro's number?

a)

6.022 x 10^22

b)

6.022 x 10^23

c)

6.022 x 10^24

d)

6.022 x 10^25

24.

What is the molar mass of water (H2O)?

a)

16 g/mol

b)

17 g/mol

c)

18 g/mol

d)

19 g/mol

25.

Which of the following is an example of a colloid?

a)

Saltwater

b)

Milk

c)

Sugar solution

d)

Air

26.

What is the SI unit of length?

a)

Kilogram

b)

Second

c)

Meter

d)

Ampere

27.

What is the force that opposes motion between two surfaces in contact?

a)

Gravity

b)

Friction

c)

Tension

d)

Magnetism

28.

Which of the following is a type of energy?

a)

Mass

b)

Volume

c)

Kinetic

d)

Density

29.

What is the speed of light in a vacuum?

a)

3.0 x 10^8 m/s

b)

3.0 x 10^6 m/s

c)

3.0 x 10^5 m/s

d)

3.0 x 10^7 m/s

30.

What is the measure of the average kinetic energy of the particles in a substance?

(a)  

31.

Which of these is a good conductor of electricity?

a)

Rubber

b)

Wood

c)

Plastic

d)

Copper

32.

What is the property of a body to resist changes in its state of motion?

a)

Inertia

b)

Velocity

c)

Acceleration

d)

Momentum

33.

What type of lens is thicker in the middle and converges light rays?

a)

Convex

b)

Concave

c)

Cylindrical

d)

Prismatic

34.

What is the formula for calculating speed?

a)

Speed = Distance x Time

b)

Speed = Distance / Time

c)

Speed = Time / Distance

35.

Which law states that energy cannot be created or destroyed, only transformed?

a)

Newton's First Law

b)

Newton's Second Law

c)

Law of Conservation of Energy

d)

Law of Universal Gravitation

36.

What is the SI unit of force?

a)

Joule

b)

Watt

c)

Newton

d)

Pascal

37.

Which of the following is a renewable energy source?

a)

Coal

b)

Oil

c)

Natural gas

d)

Solar

38.

What is the phenomenon where a wave changes direction as it passes from one medium to another?

a)

Reflection

b)

Refraction

c)

Diffraction

d)

Interference

39.

Which color of light has the shortest wavelength?

a)

Red

b)

Green

c)

Blue

d)

Violet

40.

What is the relationship between frequency and wavelength of a wave?

a)

Directly proportional

b)

Inversely proportional

c)

Independent

d)

Exponential

41.

Which of the following is a vector quantity?

a)

Speed

b)

Distance

c)

Velocity

d)

Mass

42.

What is the formula for potential energy?

a)

PE=mv2PE = mv^2

b)

PE = mgh

c)

12mv2\frac{1}{2} mv^2

d)

PE = Fd

43.

What is the effect of increasing the temperature on the resistance of a metallic conductor?

a)

Decreases

b)

Increases

c)

Remains the same

d)

Becomes zero

44.

Which of Newton's laws explains why a rocket moves forward when it expels gas backward?

a)

First Law

b)

Second Law

c)

Third Law

d)

Law of Gravitation

45.

What is the term for the time it takes for one complete cycle of a wave to pass a point?

a)

Frequency

b)

Wavelength

c)

Amplitude

d)

Period

46.

Which type of electromagnetic wave is used in microwave ovens?

a)

Radio waves

b)

Infrared waves

c)

Microwaves

d)

Ultraviolet waves

47.

What is the angle of incidence when the angle of reflection is 45 degrees?

a)

90 degrees

b)

0 degrees

c)

45 degrees

d)

22.5 degrees

48.

What is the principle behind the working of optical fibers?

a)

Reflection

b)

Refraction

c)

Total internal reflection

d)

Diffraction

49.

What is the formula for calculating pressure?

a)

Pressure = Force x Area

b)

Pressure = Force / Area

c)

Pressure = Area / Force

d)

Pressure = 1 / (Force x Area)

50.

What is the Doppler effect?

a)

The change in frequency of a wave due to the motion of the source or observer

b)

The bending of light around obstacles

c)

The splitting of white light into its constituent colors

d)

The interference of two waves

51.

What is the name of our galaxy?

a)

Andromeda

b)

Triangulum

c)

Milky Way

d)

Whirlpool

52.

Which planet is known as the "Red Planet"?

a)

Venus

b)

Mars

c)

Jupiter

d)

Saturn

53.

What is the largest planet in our solar system?

a)

Earth

b)

Mars

c)

Saturn

d)

Jupiter

54.

What is the name of the force that keeps planets in orbit around the Sun?

a)

Friction

b)

Gravity

c)

Magnetism

d)

Tension

55.

What is the Earth's natural satellite?

a)

Sun

b)

Mars

c)

Moon

d)

Venus

56.

Which layer of the Earth is made up of tectonic plates?

a)

Inner core

b)

Outer core

c)

Mantle

d)

Crust

57.

What causes day and night on Earth?

a)

Earth's revolution

b)

Earth's tilt

c)

Earth's rotation

d)

Solar flares

58.

What is the name of the process by which plants convert sunlight into energy?

a)

Respiration

b)

Photosynthesis

c)

Transpiration

d)

Digestion

59.

Which gas makes up the majority of Earth's atmosphere?

(a)  

60.

What is the name of the phenomenon when the Moon passes between the Sun and Earth?

a)

Lunar eclipse

b)

Solar eclipse

c)

Supermoon

d)

Blue moon

61.

Which type of rock is formed from cooled lava or magma?

a)

Sedimentary

b)

Metamorphic

c)

Igneous

d)

Organic

62.

What is the name of the boundary between the Earth's crust and mantle?

a)

Gutenberg discontinuity

b)

Lehmann discontinuity

c)

Moho discontinuity

d)

Curie point

63.

Which of the following is a greenhouse gas?

a)

Nitrogen

b)

Oxygen

64.

What causes the seasons on Earth?

a)

Earth's distance from the Sun

b)

Earth's rotation

c)

Earth's tilt on its axis

d)

Solar flares

65.

Which of the following is a type of cloud?

a)

Stratosphere

b)

Mesosphere

c)

Cumulus

d)

Thermosphere

66.

What is the name of the scale used to measure the magnitude of an earthquake?

a)

Richter scale

b)

Beaufort scale

c)

Celsius scale

d)

Fujita scale

67.

What is the name of the theory that explains the formation of the universe?

a)

Steady State Theory

b)

Big Bang Theory

c)

Oscillation Theory

68.

Which layer of the atmosphere contains the ozone layer?

a)

Troposphere

b)

Stratosphere

c)

Mesosphere

d)

Thermosphere

69.

What is the name of the process by which rocks are broken down into smaller pieces by physical means?

a)

Chemical weathering

b)

Biological weathering

c)

Mechanical weathering

d)

Erosion

70.

Which type of plate boundary is associated with the formation of mountain ranges like the Himalayas?

a)

Divergent

b)

Convergent

c)

Transform

d)

Subduction

71.

What is the name of the supercontinent that existed about 300 million years ago?

a)

Laurasia

b)

Gondwana

c)

Pangaea

72.

Which of the following is a renewable source of energy?

a)

Coal

b)

Oil

c)

Natural gas

d)

Wind

73.

What is the albedo effect?

a)

The absorption of sunlight by the Earth's surface

b)

The reflection of sunlight by the Earth's surface

c)

The trapping of heat by greenhouse gases

d)

The emission of heat from the Earth's core

74.

What is the Coriolis effect?

a)

The deflection of moving objects due to the Earth's rotation

b)

The change in sea level due to the Moon's gravity

c)

The formation of clouds due to evaporation

d)

The movement of tectonic plates

75.

What is the Kuiper Belt?

a)

A region of the solar system beyond the orbit of Neptune containing many icy bodies

b)

A layer of the Earth's atmosphere

c)

A type of galaxy

d)

A type of rock formation

76.

What is the basic unit of life?

a)

Atom

b)

Molecule

c)

Cell

d)

Organ

77.

Which part of the cell controls its activities?

a)

Cell membrane

b)

Cytoplasm

c)

Nucleus

d)

Mitochondria

78.

What is the process by which plants make their own food?

a)

Respiration

b)

Photosynthesis

c)

Transpiration

d)

Digestion

79.

Which gas do plants release during photosynthesis?

a)

Carbon dioxide

b)

Nitrogen

c)

Oxygen

d)

Hydrogen

80.

What is the function of the roots of a plant?

a)

To produce flowers

b)

To absorb water and nutrients

c)

To make food

d)

To protect the plant

81.

Which of the following is a vertebrate?

a)

Insect

b)

Worm

c)

Fish

d)

Snail

82.

What is the process by which animals obtain energy from food?

a)

Photosynthesis

b)

Respiration

c)

Transpiration

d)

Digestion

83.

Which organ system is responsible for transporting blood throughout the body?

a)

Digestive system

b)

Respiratory system

c)

Circulatory system

d)

Nervous system

84.

The function of the cell membrane is:

a)

To control what enters and leaves the cell

b)

To produce energy for the cell

c)

To store genetic information

d)

To support the cell during division

85.

Which part of the cell is responsible for producing energy?

a)

Nucleus

b)

Ribosome

c)

Mitochondria

d)

Endoplasmic reticulum

86.

What is the role of chlorophyll in photosynthesis?

a)

To absorb water

b)

To absorb sunlight

c)

To release oxygen

d)

To produce sugar

87.

Which of the following is an invertebrate?

a)

Bird

b)

Snake

c)

Butterfly

d)

Frog

88.

What is the function of the digestive system?

a)

To transport blood

b)

To exchange gases

c)

To break down food

89.

Which organ is responsible for filtering blood and removing waste products?

a)

Heart

b)

Lungs

c)

Liver

d)

Kidney

90.

What is the role of the respiratory system?

a)

To transport nutrients

b)

To exchange gases

c)

To control body temperature

d)

To produce hormones

91.

Which of the following is a type of tissue?

a)

Heart

b)

Brain

c)

Epithelial

d)

Stomach

92.

What is the process of cell division called?

a)

Respiration

b)

Photosynthesis

c)

Mitosis

d)

Meiosis

93.

Which of the following is a function of the nervous system?

a)

To transport oxygen

b)

To produce hormones

c)

To control body movements and responses

d)

To digest food

94.

What is the role of enzymes in the digestive system?

a)

To absorb nutrients

b)

To break down food molecules

c)

To transport waste products

d)

To protect the digestive organs

95.

Which of the following is a type of blood cell?

a)

Neuron

b)

Epithelial cell

c)

Red blood cell

d)

Muscle cell

96.

What is the function of the skeletal system?

a)

To transport blood

b)

To provide support and structure

c)

To control body movements

d)

To digest food

97.

Which of the following is a type of muscle tissue?

4 lines
98.

What is the role of DNA in a cell?

a)

To produce energy

b)

To control cell activities

c)

To store genetic information

d)

To transport nutrients

99.

What is the process of genetic information being passed from parents to offspring called?

a)

Mutation

b)

Evolution

c)

Heredity

d)

Adaptation

100.

Which of the following is a characteristic of living organisms?

a)

Ability to reproduce

b)

Ability to move

c)

Ability to think

d)

Ability to fly

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