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Test: Work, Energy and Power - SSC CGL MCQ


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15 Questions MCQ Test General Awareness for SSC CGL - Test: Work, Energy and Power

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

What is the formula to calculate work done by a constant force?

Detailed Solution for Test: Work, Energy and Power - Question 1

The correct formula to calculate the work done by a constant force is W = Fs cos θ, where F is the force applied on a body, s is the displacement of the body, and θ is the angle between the force and the displacement vectors. This formula highlights the scalar nature of work and shows that work done is positive when the angle between the force and displacement is acute, and negative when the angle is obtuse.

Test: Work, Energy and Power - Question 2

Under what conditions is the work done by a force zero?

Detailed Solution for Test: Work, Energy and Power - Question 2

The work done by a force is zero under two main conditions: when the body is not displaced (s = 0) and when the body is displaced perpendicular to the direction of the force (θ = 90°). In these scenarios, the force applied does not contribute to the work done on the body.

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Test: Work, Energy and Power - Question 3

How is the work done by a variable force related to a force-displacement graph?

Detailed Solution for Test: Work, Energy and Power - Question 3

The work done by a variable force is represented by the area under the force-displacement graph. This relationship indicates that the work done is directly related to the area enclosed by the force-displacement curve. By calculating this area, one can determine the total work done by the force on the object.

Test: Work, Energy and Power - Question 4

What type of energy is defined as the energy a body possesses due to its motion?

Detailed Solution for Test: Work, Energy and Power - Question 4

Kinetic Energy is the energy a body possesses by virtue of its motion. It is dependent on the mass of the body and its velocity. When an object is in motion, it has kinetic energy. This form of energy is crucial in various phenomena, from simple movements to complex systems like vehicles in motion or celestial bodies orbiting in space.

Test: Work, Energy and Power - Question 5

According to Einstein's mass-energy relation, when a mass Δm disappears, what is the energy produced given by?

Detailed Solution for Test: Work, Energy and Power - Question 5

According to Einstein's mass-energy relation, the energy produced when a mass Δm disappears is given by the equation E = Δmc². This famous equation, E=mc², signifies the equivalence of mass and energy. It states that mass can be converted into energy and vice versa, highlighting the profound interrelation between matter and energy in the universe.

Test: Work, Energy and Power - Question 6

What characteristic defines conservative forces among the forces ?

Detailed Solution for Test: Work, Energy and Power - Question 6

Conservative forces in physics are non-dissipative forces, such as gravitational and electrostatic forces. One key characteristic of conservative forces is that the total mechanical energy initially is equal to the total mechanical energy finally in a system. This principle is derived from the law of conservation of energy, which states that energy cannot be created or destroyed, only transformed from one form to another.

Test: Work, Energy and Power - Question 7

How is power defined of physics?

Detailed Solution for Test: Work, Energy and Power - Question 7

In physics, power is defined as the rate at which work is done by a body. It represents the amount of energy transferred or converted per unit time. For instance, a 60-watt light bulb converts electrical energy into light and heat at a rate of 60 joules per second. This concept helps us understand how fast energy is being transformed or transferred, crucial in various practical applications like engineering and mechanics.

Test: Work, Energy and Power - Question 8

What is the SI unit of power?

Detailed Solution for Test: Work, Energy and Power - Question 8

The SI unit of power is the watt, symbolized as "W." One watt is equivalent to one joule per second. This unit is commonly used to measure the rate of energy transfer, as in electrical systems, where the power rating of devices like light bulbs, motors, and heaters is specified in watts. Understanding this unit helps in quantifying and comparing the energy consumption or output of different devices accurately.

Test: Work, Energy and Power - Question 9

How does power relate to force and velocity?

Detailed Solution for Test: Work, Energy and Power - Question 9

Power in physics is related to force and velocity by the equation P = F * v * cos(θ), where P is power, F is force, v is velocity, and θ is the angle between the force and velocity vectors. This relationship highlights that power is influenced by both the magnitude of the force applied and the speed at which an object moves in the direction of that force. Understanding this connection is crucial in analyzing mechanical systems and optimizing energy transfer efficiencies.

Test: Work, Energy and Power - Question 10

What is a collision, and what distinguishes an elastic collision from an inelastic collision?

Detailed Solution for Test: Work, Energy and Power - Question 10

A collision involves particles interacting over a short duration with strong forces. In an elastic collision, both momentum and kinetic energy are conserved, indicating that all forces involved are conservative. On the other hand, in an inelastic collision, only momentum is conserved, and kinetic energy is not conserved. This distinction is crucial in understanding the behavior of colliding bodies and the effects of different collision types.

Test: Work, Energy and Power - Question 11

What defines a perfectly inelastic collision, and what happens to the colliding bodies during such a collision?

Detailed Solution for Test: Work, Energy and Power - Question 11

In a perfectly inelastic collision, the colliding bodies stick together after the collision and move with a common velocity. This type of collision conserves momentum but not kinetic energy, resulting in the loss of kinetic energy that is not recovered. The concept of perfectly inelastic collisions is essential in understanding how energy is transformed and dissipated during certain types of physical interactions.

Test: Work, Energy and Power - Question 12

What does the centre of mass represent in a physical system, and how does it behave under external forces?

Detailed Solution for Test: Work, Energy and Power - Question 12

The centre of mass of a physical system is a crucial point that describes the system's motion as a whole, behaving as if all the mass were concentrated at that point. This point moves in response to external forces, reflecting the overall mass distribution and motion of the system. Understanding the centre of mass is fundamental in analyzing the dynamics and behavior of complex physical systems.

Test: Work, Energy and Power - Question 13

What does the moment of inertia of a body about an axis of rotation represent?

Detailed Solution for Test: Work, Energy and Power - Question 13

The moment of inertia of a body about an axis of rotation is the sum of the products of the masses of its particles and the squares of their respective distances from the axis of rotation. This concept helps us understand how the mass of an object is distributed relative to its axis of rotation, influencing its rotational motion.

Test: Work, Energy and Power - Question 14

What is the theorem of parallel axes related to in terms of moment of inertia?

Detailed Solution for Test: Work, Energy and Power - Question 14

The theorem of parallel axes states that the moment of inertia about any parallel axis is the sum of the moment of inertia about the center of mass and the product of the mass and the square of the distance between the two axes. This theorem is crucial in calculating the moment of inertia of complex objects with respect to different axes.

Test: Work, Energy and Power - Question 15

What does the radius of gyration represent in relation to a body's moment of inertia?

Detailed Solution for Test: Work, Energy and Power - Question 15

The radius of gyration is the distance from the axis of rotation at which the total mass of the body can be considered to be concentrated, such that its moment of inertia remains the same. This concept simplifies calculations by allowing us to treat the mass distribution of a body as if it were concentrated at a single point while preserving its moment of inertia.

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