The question asks about the fundamental force or phenomenon responsible for keeping the Earth's atmosphere from escaping into space. We need to identify which of the given options exerts a pull strong enough to hold gases around a planetary body.
Correct Option: A) Gravity is the fundamental force that attracts all matter towards the center of the Earth. The Earth's immense mass creates a strong gravitational field that pulls atmospheric gases downwards, preventing them from escaping into space. This is why planets with sufficient mass (like Earth) can retain an atmosphere, while smaller bodies (like the Moon) cannot.
The question asks to identify the factors responsible for bringing dynamic changes on the surface of the Earth. We need to evaluate each listed item to determine its role in shaping the Earth's surface.
All six factors listed contribute significantly to the dynamic changes observed on the Earth's surface, either directly or indirectly.
Correct Option: D) 1, 2, 3, 4, 5 and 6
The question asks for the standard value of acceleration due to gravity. This is a fundamental constant in physics, specifically in the context of Earth's gravitational field, and its approximate value is widely known.
B) \(9.8 \, \text{m/s}^2\) is the universally accepted and approximate standard value for the acceleration due to gravity on the surface of the Earth.
This question tests the understanding of Newton's Law of Universal Gravitation, which describes the attractive force between any two objects with mass. It's crucial to remember that gravitational force is always mutual and attractive.
Correct Option: C) Both apple and the earth attracts each other. This option correctly states that the gravitational force is mutual, meaning both the apple and the Earth exert an attractive force on each other.
The question asks for the SI unit of weight. To answer this, we need to understand the definition of weight and recall its standard unit in the International System of Units (SI).
D) Newton is the correct SI unit for force, and since weight is a force, Newton is its SI unit.
The question asks to identify which of the given space missions encourage and support microgravity research. We need to evaluate each mission individually to determine its relevance to microgravity research.
C) All three of the mentioned space missions—Axiom-4, SpaDeX, and Gaganyaan—are involved in or provide platforms for microgravity research. Axiom-4 is an ISS mission, SpaDeX includes a microgravity experiment module, and Gaganyaan, as a human spaceflight mission, will conduct microgravity experiments.