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Test: Gravitation - SSC CGL MCQ


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15 Questions MCQ Test General Awareness for SSC CGL - Test: Gravitation

Test: Gravitation for SSC CGL 2024 is part of General Awareness for SSC CGL preparation. The Test: Gravitation questions and answers have been prepared according to the SSC CGL exam syllabus.The Test: Gravitation MCQs are made for SSC CGL 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Gravitation below.
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Test: Gravitation - Question 1

What is the universal gravitational constant, denoted as 'G', according to Newton's Law of Gravitation?

Detailed Solution for Test: Gravitation - Question 1

The universal gravitational constant, represented by 'G', is 6.67 × 10−11N m2/kg2. This constant is essential in Newton's Law of Gravitation, which quantifies the strength of the gravitational force between two point masses.

Test: Gravitation - Question 2

How does the value of acceleration due to gravity 'g' change with altitude from the Earth's surface?

Detailed Solution for Test: Gravitation - Question 2

The value of acceleration due to gravity 'g' decreases with altitude from the Earth's surface. This decrease is a result of the inverse square law of gravitation, where the gravitational force weakens as the distance from the Earth's center increases.

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Test: Gravitation - Question 3

What is the effect of the rotation of Earth on gravity, considering Earth's angular velocity denoted as 'ω'?

Detailed Solution for Test: Gravitation - Question 3

The rotation of Earth affects gravity differently based on latitude. This effect is quantified by the adjusted acceleration due to gravity formula, where the gravitational acceleration is modified by the term \(R\omega^2 \cos^2 \lambda\), with λ representing the latitude. At the poles and the equator, this effect varies, showcasing the impact of Earth's rotation on gravity.

Test: Gravitation - Question 4

What is the fundamental difference between mass and weight?

Detailed Solution for Test: Gravitation - Question 4

The key disparity between mass and weight lies in their characteristics. Mass is an intrinsic property of matter that remains constant regardless of location, while weight is the gravitational force acting on an object that varies depending on the location due to differences in gravity. This distinction is crucial in understanding how objects interact with the Earth's gravitational field.

Test: Gravitation - Question 5

How does the weight of an object change when in free fall?

Detailed Solution for Test: Gravitation - Question 5

When an object is in free fall, such as during a state of weightlessness, the weight of the object is effectively zero. This occurs because the object and the gravitational force are in balance, resulting in the sensation of weightlessness. Understanding this concept is vital in comprehending the dynamics of objects in free fall scenarios.

Test: Gravitation - Question 6

What happens to an object's weight in a lift when it is accelerating downward?

Detailed Solution for Test: Gravitation - Question 6

When a lift accelerates downward, the spring balance reads less than the true weight of the object. This phenomenon occurs due to the counteracting force of acceleration acting in the opposite direction to gravity. Understanding how weight is perceived in different scenarios within a lift is essential in grasping the principles of gravitational forces.

Test: Gravitation - Question 7

According to Kepler's Laws of Planetary Motion, what does the Harmonic Law state?

Detailed Solution for Test: Gravitation - Question 7

According to Kepler's Harmonic Law, the square of a planet's orbital period (T) is directly proportional to the cube of the semi-major axis (a) of its orbit. This law essentially describes the relationship between the time a planet takes to orbit the Sun and the average distance of the planet from the Sun. It signifies that as the size of a planet's orbit increases, the time it takes to complete one orbit also increases in a specific mathematical relationship, demonstrating the harmonious balance in planetary motion.

Test: Gravitation - Question 8

Which planet in our solar system is closest to the Sun?

Detailed Solution for Test: Gravitation - Question 8

Mercury is the planet in our solar system that is closest to the Sun. It orbits the Sun at an average distance of about 36 million miles (58 million kilometers) and is known for its extreme temperature variations due to its proximity to the Sun.

Test: Gravitation - Question 9

What is the major concept behind Kepler's First Law of Planetary Motion?

Detailed Solution for Test: Gravitation - Question 9

Kepler's First Law of Planetary Motion states that all planets orbit the Sun in elliptical paths with the Sun at one of the two foci. This law describes the shape of planetary orbits, emphasizing that they are not perfect circles but rather elongated ovals known as ellipses. This insight revolutionized the understanding of celestial motion and laid the foundation for modern astronomy.

Test: Gravitation - Question 10

What is the primary use of geostationary satellites?

Detailed Solution for Test: Gravitation - Question 10

Geostationary satellites are primarily used for communication purposes. These satellites appear stationary relative to Earth, making them ideal for telecommunications, broadcasting, internet connectivity, and other communication services. By orbiting at the same rate as Earth's rotation, they maintain a fixed position in the sky, allowing for consistent communication coverage over specific regions on Earth.

Test: Gravitation - Question 11

What is the defining characteristic of polar satellites?

Detailed Solution for Test: Gravitation - Question 11

Polar satellites orbit in a north-south direction, passing over Earth's polar regions, and are typically in a low Earth orbit. This orbital path allows them to cover the entire surface of the Earth over multiple orbits. Due to their close proximity to Earth, polar satellites are commonly used for tasks such as weather monitoring and environmental observation.

Test: Gravitation - Question 12

What is the significance of escape velocity of satellites?

Detailed Solution for Test: Gravitation - Question 12

Escape velocity is the minimum speed required for an object to break free from Earth's gravitational pull and enter space without falling back.Satellites, understanding escape velocity is crucial for launching and maintaining satellites in orbit. By exceeding this velocity, a satellite can overcome Earth's gravitational force and remain in its intended orbit.

Test: Gravitation - Question 13

What does the term 'Gravitational Potential Energy' of gravitational fields?

Detailed Solution for Test: Gravitation - Question 13

Gravitational Potential Energy represents the work done to bring a unit mass from infinity to a specific point in a gravitational field. This concept is essential in understanding the energy associated with gravitational interactions and the potential energy stored in objects within a gravitational field.

Test: Gravitation - Question 14

Why is the weight experienced on the Moon different from that on Earth?

Detailed Solution for Test: Gravitation - Question 14

The weight experienced on the Moon is different from that on Earth primarily because the Moon has a weaker gravitational force compared to Earth. This weaker gravitational pull on the Moon's surface results in objects weighing approximately one-sixth of what they would on Earth. Understanding this gravitational difference is essential in comprehending the variations in weight experienced on different astronomical bodies.

Test: Gravitation - Question 15

Which planet in our solar system is known for its prominent ring system?

Detailed Solution for Test: Gravitation - Question 15

Saturn is the planet in our solar system known for its prominent ring system, composed of countless icy particles ranging in size from tiny grains to large chunks. These rings make Saturn one of the most visually striking planets and have fascinated astronomers and space enthusiasts for centuries.

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