Lakshya Education MCQs

Question: Assertion (A): Existence of human life on Venus is highly improbable.


Reason (R): Venus has extremely high level of carbon dioxide in its atmosphere.
Options:
A.Both A and R are true and R is the correct explanation of A
B.Both A and R are true but R is NOT the correct explanation of A
C.A is true but R is false
D.A Js false but R is true
Answer: Option 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.

Submit Answer & Explaination

Earn Reward Points by submitting Detailed Explaination for this Question

More Questions on This Topic :

Question 1. 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.
  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A
  3.    A is true but R is false
  4.    A Js false but R is true
Answer: Option 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.
Question 2. 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.
  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A
  3.    A is true but R is false
  4.    A Js false but R is true
Answer: Option C
: 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 3. 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?
  1.    La Nina
  2.    Movement of Jet Streams
  3.    El Nino and Southern Oscillations
  4.    Greenhouse effect on global level
Answer: Option C
: 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 4. 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.    1 and 2
  2.    2, 3 and 4
  3.    1, 3 and 4
  4.    1, 2, 3 and 4
Answer: Option B
: 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 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.
  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A
  3.    A is true but R is false
  4.    A Js false but R is true
Answer: Option 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. Assertion (A): The thickness of the atmosphere is maximum over the Equator.


Reason (R): High insulation and strong convection currents occur over the Equator.
  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A
  3.    A is true but R is false
  4.    A Js false but R is true
Answer: Option 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.

Check all Questions in this Topic : Click HERE