Questions and answers for exam Preparation

MCQs

Total Questions : 10

Assertion (A): The thickness of the atmosphere is maximum over the Equator.
Reason (R): High insulation and strong convection currents occur over the Equator.

Both A and R are true and R is the correct explanation of A
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A Js false but R is true

Discuss Question

Answer: Option A. -> Both A and R are true and R is the correct explanation of A
:
A

Ans. (a)

Explanation

High insolation and strong convection currents result in expansion of air, at the equator. Thereby the thickness of the atmosphere is maximum over the equator.

Question 2.

Consider the following statements :
1. Total land area of Earth is approximately 1475 lakh square kilometres.
2. Ratio of land area to water area of Earth is approximately 1:4.
3. Maximum percentage of Earth's water is in the Pacific Ocean.
Which of the statements given above is/are correct?

1 and 3
2 and 3
1 only
3 only

Discuss Question

Answer: Option A. -> 1 and 3
:
A

Ans. (a)

Explanation

Ratio of land area to water area of earth is 29:71 (nearly 1:2.5).

Surface area of Earth : 510,100,500 sq. km.

Land area of Earth : 148,950,800 sq. km.

Ocean Surface of Earth : 361,149,700 sq. km.

Question 3.

Consider the following statements :
1. Ocean currents are the slow-surface movement of water in the ocean.
2. Ocean currents assist in maintaining the Earth's heat balance.
3. Ocean currents are set in motion primarily by prevailing winds.
4. Ocean currents are affected by the configuration of the ocean.
Which of these statements are correct?

1 and 2
2, 3 and 4
1, 3 and 4
1, 2, 3 and 4

Discuss Question

Answer: Option B. -> 2, 3 and 4
:
B

Ans. (b)

Explanation

The ocean currents are not only slow but also could be fast. So, statements 2, 3 and 4 are correct.

Question 4.

Assertion (A): The same face of the Moon is always presented to the Earth.
Reason: The Moon rotates about its own axis in 23V-i days which is about the same time that it takes to orbit the Earth.

Both A and R are true and R is the correct explanation of A
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A Js false but R is true

Discuss Question

Answer: Option C. -> A is true but R is false
:
C

Ans. (c)

Explanation

Moon rotates more slowly than the Earth and takes little over 27 days to rotate once. Since it takes about the same time to revolve around the earth, it always presents the same face or hemisphere to the Earth. Hence R is not correct statement.

Question 5.

Assertion (A): Areas lying within five to eight degrees latitude on either side of the equator receive rainfall throughout the year.
Reason (R): High temperatures and high humidity cause convectional rain to fall mostly in the afternoons near the equator.

Both A and R are true and R is the correct explanation of A
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A Js false but R is true

Discuss Question

Answer: Option A. -> Both A and R are true and R is the correct explanation of A
:
A

Ans. (a)

Explanation

Areas lying within 5° - 8° latitude on either side of the equator receives convectional rainfall, mostly in the afternoons throughout the year, due to high humidity and high temperatures.

Question 6.

For short-term climatic predictions, which one of the following events, detected in the last decade, is associated with occasional weak monsoon rains in the Indian sub-continent?

La Nina
Movement of Jet Streams
El Nino and Southern Oscillations
Greenhouse effect on global level

Discuss Question

Answer: Option C. -> El Nino and Southern Oscillations
:
C

Ans. (c)

Explanation

El Nino and Southern oscillation are the reasons associted with occasional weak monsoon rains in Indian sub-continent. El Nino is a warm oceanic current of pacific ocean, near Peru coast of S. America.

Question 7.

Assertion (A): Existence of human life on Venus is highly improbable.
Reason (R): Venus has extremely high level of carbon dioxide in its atmosphere.

Both A and R are true and R is the correct explanation of A
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A Js false but R is true

Discuss Question

Answer: Option A. -> Both A and R are true and R is the correct explanation of A
:
A

Ans. (a)

Explanation

Venus second closest planet after Mercury to the Sun is often considered 'Earth's twin' because of their close proximity in size, mass (weight) and density. Existence of human life is highly improbable because of high levels C0₂ in its atmosphere.

Question 8.

Consider the following geological phenomena :
1. Development of a fault
2. Movement along a fault
3. Impact produced by a volcanic eruption
4. Folding of rocks
Which of the above cause earthquakes?

1, 2 and 3
2 and 4
1, 3 and 4
1, 2, 3 and 4

Discuss Question

Answer: Option D. -> 1, 2, 3 and 4
:
D

Ans. (d)

Explanation

Faults, thrusts, folds are associated with earth's crust. Impact produced by a volcanic eruption also causes earthquake.

Question 9.

Which one of the following statements is correct with reference to our solar system?

The Earth is the densest of all the planets in our solar system
The predominant element in the composition of Earth is silicon
The Sun contains 75 percent of the mass of the solar system
The diameter of the Sun is 190 times that of the Earth

Discuss Question

Answer: Option A. -> The Earth is the densest of all the planets in our solar system
:
A

Ans. (a)

Explanation

The predominant element in the earth's composition is 'Fe' (35%), while in the earth's crust is Oxygen (46 %). The Sun contains more than 99% of the mass of the Solar System. The diameter of the Sun is 109 times that of the Earth.

Question 10.

Assertion (A): The amount of moisture in the atmosphere is related to latitude.
Reason (R): The capacity to hold moisture in the form of water vapour is related to temperature.

Both A and R are true and R is the correct explanation of A
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A Js false but R is true

Discuss Question

Answer: Option A. -> Both A and R are true and R is the correct explanation of A
:
A

Ans. (a)

Explanation

The amount of moisture in the atmosphere is related to latitude. Because, according to the change in latitudes, temperature also varies on the earth. Temperature directly influences the moisture holding capacity of the atmosphere.