With reference to the "Big Bang Theory", consider the following statements: 1. It is also known as the expanding universe hypothesis. 2. Edwin Hubble provided evidence in 1850 that the universe is expanding. 3. The theory posits that while the distance between galaxies is increasing, the galaxies themselves do not expand in size. Which of the statements given above is/are correct?

Correct Option The correct option is 1 and 3 only. Explanation The Big Bang Theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution. It describes how the universe expanded from an initial state of high density and temperature. Statement-wise Analysis - Statement 1 is Correct: The Big Bang Theory is popularly known as the expanding universe hypothesis. It suggests that the universe is not static but is constantly expanding in all directions. - Statement 2 is Incorrect: Edwin Hubble provided evidence for the expansion of the universe in 1920 (specifically 1929), not 1850. He observed that the redshift of distant galaxies increased with their distance from Earth, implying they were moving away. - Statement 3 is Correct: The theory posits that the space between galaxies is stretching, which increases the distance between them. However, the galaxies themselves (and the solar systems within them) are held together by gravitational forces and do not expand in size. Key Takeaway: While the universe expands, causing the distance between galaxy clusters to increase, individual gravitationally bound structures like galaxies, stars, and planets do not expand.

With reference to the "Big Bang Theory",… - NCERT Class 11 Geography MCQ

NCERT Class 11 Geography — Chapter 1: The Orgin and Evolution of the earth

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With reference to the "Big Bang Theory", consider the following statements:

It is also known as the expanding universe hypothesis.
Edwin Hubble provided evidence in 1850 that the universe is expanding.
The theory posits that while the distance between galaxies is increasing, the galaxies themselves do not expand in size.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Fundamentals of Physical Geography · Page 2

Options

A2 only
B1 and 3 only
C1, 2 and 3
D1 and 2 only

Did you get this right?

Solution

Correct Option

The correct option is 1 and 3 only.

Explanation

The Big Bang Theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution. It describes how the universe expanded from an initial state of high density and temperature.

Statement-wise Analysis

Statement 1 is Correct: The Big Bang Theory is popularly known as the expanding universe hypothesis. It suggests that the universe is not static but is constantly expanding in all directions.
Statement 2 is Incorrect: Edwin Hubble provided evidence for the expansion of the universe in 1920 (specifically 1929), not 1850. He observed that the redshift of distant galaxies increased with their distance from Earth, implying they were moving away.
Statement 3 is Correct: The theory posits that the space between galaxies is stretching, which increases the distance between them. However, the galaxies themselves (and the solar systems within them) are held together by gravitational forces and do not expand in size.

Key Takeaway: While the universe expands, causing the distance between galaxy clusters to increase, individual gravitationally bound structures like galaxies, stars, and planets do not expand.

Your note

More from Chapter 1: The Orgin and Evolution of the earth

The "Nebular Hypothesis" is primarily associated with the origin of which of the following?

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In the revised Nebular Hypothesis proposed by Schmidt and Weizsäcker, the solar nebula was considered to be primarily composed of:

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Which of the following theories regarding the origin and evolution of the universe is currently most accepted by the scientific community?

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The "Giant Impact" hypothesis primarily explains the origin of which celestial body?

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Through which process do planetesimals aggregate to form larger planetary bodies?

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