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Science 7 LT4 Revision A

Total questions: 51

Worksheet time: 26mins

Name
Class
Date
1.
What is the molecular structure of water?
a)
H2O
b)
H2O2
c)
HO2
d)
Wawa
2.
Solid H2O is less dense than liquid H2O because h-bonds hold the molecules farther apart, so
a)
paper clips float
b)
clouds float
c)
ice floats
d)
water takes more energy to heat up
3.
The pH scale ranges from
a)
0-14
b)
0-7
c)
7-14
d)
1, 2, or 3
4.
If a substance measures 7 on the pH scale, it is
a)
acidic
b)
basic
c)
neutral
d)
magical
5.
If a substance measures below 7 on the pH scale, it is
a)
acidic
b)
basic
c)
neutral
d)
boring but sweet
6.
Pure water is
a)
acidic
b)
basic
c)
neutral
d)
a rare commodity
7.
Lemon juice is
a)
acidic
b)
basic
c)
neutral
d)
what you get when life hands you lemons
8.
A substance that releases H+ and tastes sour
a)
acidic
b)
basic
c)
neutral
d)
great for your teeth
9.
What is the main driving force to the Water Cycle?
a)
Weather
b)
The Sun
c)
Oceans
d)
Evaporation
10.
Which of these is an example of precipitation?
a)
snow
b)
ice
c)
clouds
d)
vapor
11.
What is it called when WATER is FORMED from an LIQUID to  WATER VAPOR (GAS)?
a)
EVAPORATION
b)
PRECIPITATION
c)
TRANSPIRATION
d)
CONDENSATION
12.
What is it called when plants give off water vapor as a waste product?
a)
condensation
b)
evaporation
c)
sublimation
d)
transpiration
13.
What is the water cycle?
a)
the 3 forms of water
b)
the movement of water on, above, or below the surface of the Earth
c)
when water melts
d)
when clouds form
14.
During which stage do clouds form?
a)
condensation
b)
evaporation
c)
precipitation
d)
transpiration
15.
Water is a universal solvent because it...
a)
It can be found anywhere
b)
It freezes when it gets cold
c)
floats when frozen
d)
Dissolves most substances
16.

Which of the following is true of an acid?

a)

It has a pH value of 7.

b)

It turns red litmus paper blue.

c)

It turns blue litmus paper red.

d)

It has a pH value of more than 7.

17.

Litmus paper can be used to determine the pH value of a solution.

a)

True

b)

False

18.

Distilled water has a pH of 7.

a)

True

b)

False

19.

When a Universal Indicator is added to a solution of potassium hydroxide, the solution turns blue.

a)

True

b)

False

20.

When a Universal Indicator is added to sulphuric acid, the solution turns red.

a)

True

b)

False

21.

When acids and alkalis react, salts of neutral pH are formed.

a)

True

b)

False

22.

Toothpaste can neutralise the acids produced by bacteria feeding on the food stuck on our teeth.

a)

True

b)

False

23.

Study the table provided.


Which substance(s) will turn blue litmus paper red?

a)

S

b)

S and T

c)

S and U

d)

T and U

24.

Study the table provided.


What gas is produced when magnesium is added to substance S?

a)

Helium

b)

Oxygen

c)

Hydrogen

d)

Carbon Dioxide

25.

When solutions P and Q are mixed, neutralisations occurs and a solution with a pH of 7 is obtained. What could the pH values of P and Q be?

a)

A

b)

B

c)

C

d)

D

26.
Which of the following is NOT a property of an acid?
a)
Tastes sour
b)
Corrosive
c)
Changes the colour of blue litmus paper to red
d)
Has a pH value higher than 7
27.
Which of the following is a strong alkali?
a)
Sodium hydroxide
b)
Potassium nitrate
c)
Sodium nitrate
d)
Potassium sulphate
28.

The Earth rotates about an imaginary axis at an angle of:

a)

10°10\degree

b)

15°15\degree

c)

23.5°23.5\degree

d)

25°25\degree

29.

If you were in space viewing the Earth from above the North Pole, you would observe that it rotates in a _________ direction.

a)

clockwise

b)

counter clockwise

30.

Match the following terms:

a)

Revolution

1.

one complete orbit around the sun

b)

Leap year

2.

a year that contains one extra day

c)

Summer solstice

3.

day with the most hours of sunlight and the fewest hours of darkness

d)

Winter solstice

4.

day with the fewest hours of sunlight and most hours of darkness

e)

Equinox

5.

days when day and night are of equal length in both hemispheres

31.

Match the following

a)

Solar System

1.

group of planets that revolve around the sun together

b)

Orbit

2.

planet's path around the sun

c)

Atmosphere

3.

layer of gases (air) surrounding Earth

d)

Axis

4.

imaginary line that runs through Earth's center between the North and South Poles

32.

Which bodies make up the solar system?

CLICK ON ALL CORRECT ANSWER CHOICES

a)

8 planets

b)

Sun

c)

Milky Way

d)

Universe

33.

path of each planet around the sun

a)

axis

b)

solar system

c)

orbit

d)

Daytona 500

34.

day with the most hours of sunlight in the Northern Hemisphere

a)

Summer Solstice

b)

Winter Solstice

c)

Fall Equinox

d)

Spring Equinox

35.

imaginary line running through the center of Earth

a)

equinox

b)

axis

c)

orbit

d)

revolution

36.

a day when day and night are of equal length

a)

solstice

b)

equinox

c)

first day of summer

d)

leap year

37.

What is Earth's complete circuit around the son called?

a)

rotation

b)

leap year

c)

orbit

d)

revolution

38.

How many planets are in our solar system?

a)

10

b)

7

c)

8

d)

9

39.
At position A, which hemisphere would have summer?
a)
Northern hemisphere
b)
Southern hemisphere
40.
Why is the Equator warmest?
a)
Because it is closest to the sun.
b)
Because it receives the most direct sunlight
c)
Because no clouds form here.
d)
Because it is far from the sun
41.

How often do we experience new seasons?

a)

Monthly

b)

Yearly

c)

Every 3 months

d)

Every 6 months

42.
CHOOSE THE CORRECT MOON PHASE
a)
NEW MOON
b)
FULL MOON
c)
WAXING GIBBOUS
d)
NONE OF THE ABOVE
43.
CHOOSE THE CORRECT MOON PHASE
a)
CRESCENT MOON
b)
NEW MOON
c)
FULL MOON
d)
WANING GIBBOUS
44.
lighter, outer part of the shadow
a)
penumbra
b)
umbra
45.
darkest, innermost part of the shadow
a)
penumbra
b)
umbra
46.
What type of eclipse occurs when the moon blocks the sun's light and cast a shadow on earth?
a)
solar
b)
lunar
47.
What type of eclipse occurs when the earth's shadow is cast on a full moon?
a)
solar
b)
lunar
48.
What moon phase occurs during a lunar eclipse?
a)
full moon
b)
new moon
c)
3rd quarter
d)
waxing crescent
49.
What moon phase occurs during a solar eclipse?
a)
Full moon
b)
new moon
c)
1st quarter
d)
waxing gibbous
50.

A revolution takes one _____.

a)

Year

b)

Month

c)

Day

51.

Which planet is known as the Red Planet because of it's red rocky surface?

a)

Mars

b)

Earth

c)

Jupiter

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