Free Our Environment 01 Practice Test - 4th Grade 

Question 1

The Earth's rotation results in day and night.

A. True
B. False

SOLUTION

Solution : A

When the Earth rotates, half of the Earth will be exposed to the rays of the sun while the other half remains dark. It is daytime on the side facing the sun while its night time on the other side of the Earth. So, the Earth's rotation results in day and night.

.

Question 2

The Earth takes _____ days to complete one revolution around the Sun.

A.

160.75

B.

561

C.

365.5

D.

400.5

SOLUTION

Solution : C

The Earth revolves in its orbits around the Sun. It takes approximately 365.5 days to complete one revolution around the Sun.
File:დედამიწა მზის გარშემო.gif - Wikimedia Commons

Question 3

Which of the following statements about the sun are false?

A. It is made up of gases.
B. It generates its own light.
C. Sun is a star.
D. Sun is a big planet.

SOLUTION

Solution : D

Sun is the closest star to the Earth. It is made up of gases like hydrogen and helium. It is the primary source of light and energy of our solar system.

Question 4

The Sun is a ______.

A. star
B. planet
C. asteroid
D. satellite

SOLUTION

Solution : A

The celestial bodies in the universe which generate light of their own are called stars.
Sun is the closest star to the Earth. It is made up of gases like hydrogen and helium. It is the primary source of light and energy of our solar system.

Question 5

Tilt in the Earth's axis is one of the reasons behind the different seasons on the Earth.

A. True
B. False

SOLUTION

Solution : A

Tilt in the Earth's axis is the reason behind the different seasons on the Earth. Different parts of the Earth receive different amount of sunlight throughout the year. So, when north pole tilts towards the Sun, it is summer in northern hemisphere and winter in southern hemisphere.

Question 6

When the southern hemisphere is facing towards the Sun, which season is it in the northern hemisphere?

A.

Winter

B.

Summer

C.

Spring

D.

Autumn

SOLUTION

Solution : A

When the southern hemisphere is facing towards the sun, northern hemisphere is facing away from sun marking summer and winter in regions respectively. 

Question 7

Nitrogen gas is used in packaging of chips.

A. True
B. False

SOLUTION

Solution : A

Nitrogen is responsible for maintaining food products fresh. Hence, nitrogen is used in packaging of chips.

Question 8

Nitrogen constitutes nearly ____ % of the atmosphere.

A. 21
B. 42
C. 57
D. 78

SOLUTION

Solution : D

Air is a mixture of gases. It contains about 78% nitrogen, 21% oxygen, 0.04% carbon dioxide, and very small amounts of other gases.

Question 9

Which layer of the atmosphere has the maximum amount of gases present in it?

A. Troposphere
B. Mesosphere
C. Stratosphere
D. Exosphere

SOLUTION

Solution : A

The air around the earth contains a mixtures of gases such as nitrogen, oxygen, carbon dioxide, water vapour and dust particles. The troposphere of the atmosphere contains about 80% of the total mass of gases in the air. It holds a maximum percentage of all the essential gases responsible for life on earth.

Question 10

The breaking down of rocks due to wind, water and other natural forces is called   _____.

A. weathering
B. deposition
C. precipitation
D. erosion

SOLUTION

Solution : A

Weathering is a process where rock is worn away or broken down into smaller pieces due to natural factors like wind, water, sunlight/heat and so on.
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