# GK Questions: General Science(Physics) – Set 3

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Hello Aspirants. Welcome to Online General Knowledge section in Affairs cloud, which is important for all the competitive exams. We have created Some questions related to General Science(Physics)Â !!!

1. Who introduced the concept of inertia ?
1.Newton
2.Pascal
3.Galileo
4.Aristotle
5.None of these
Answer – 3.Galileo
Explanation :
The term “inertia” is more properly understood as shorthand for “the principle of inertia” as described by Newton in his First Law of Motion: that anÂ objectÂ not subject to any net externalÂ forceÂ moves at a constant velocity.

2. If the resultant of all the force acting on a body is ……………………. then the body is said to be in equilibrium
1.Zero
2.Constant
3.Maximum
4.Minimum
5.None of these
Answer – 1.Zero
Explanation :
EquilibriumÂ results from the cancellation of forces acting on an object.

3. Rocket works on the principle of ……………………………
1.Circular motion
2.Centre of gravity
3.Equilibrium
4.Conservation of momentum
5.None of these
Answer – 4.Conservation of momentum
Explanation :
Conservation of momentumÂ is a fundamental law of physics which states that theÂ momentumÂ of a system is constant if there are no external forces acting on the system. It is embodied in Newton’s first law (the law of inertia).

4. If the body is at rest then the equilibrium is called as …………………
1.Dynamic
2.Neutral equilibrium
3.Static
4.Either Static or Dynamic
5.None of these
Answer – 3.Static
Explanation :
When forces acting on an object which is at rest are balanced, then we say that the object is in a state ofÂ static equilibrium. The resultant of these forces equals zero. That is, the vector sum of the forces adds to zero

5. Energy is defined as capacity of doing work.Its unit is …………….
1.Kilogram
2.Kelvin
3.Joule
4.Watt
5.None of these
Answer – 3.Joule
Explanation :
TheÂ jouleÂ symbol J, is a derived unit of energy in the International System of Units. It is equal to the energy transferred (or work done) to an object when a force of one newton acts on that object in the direction of its motion through a distance of one metre (1 newton metre or N)

6. A bullet fired from a gun can pierce a target due to its …………………………
1.Kinetic Energy
2.Law of conservation Energy
3.Potential Energy
4.Gravitational Force
5.None of these
Answer – 1.Kinetic Energy
Explanation :
Kinetic energy is the energy possessed by a body by virtue of its motion
KE = Â½(mv2)

7. ……………………… is the energy possessed by a body by virtue of its position
1.Negative Energy
2.Potential Energy
3.Positive Energy
4.Kinetic Energy
5.None of these
Answer – 2.Potential Energy
Explanation :
Potential Energy is the energy possessed by a body by virtue of its position.
Ex â€“ The potential energy of water in dams used to run turbines inorder to produce electricity.

8. The sum of all kinds of energies in an isolated system remains …………….. at all times
1.Minimum
2.Maximunm
3.Zero
4.Constant
5.None of these
Answer – 4.Constant
Explanation :
According to law of conservation of energy the sum of all kinds of energies in an isolated system remains constant at all time.

9. In a heat engine ……………….. energy changes into …………………. energy
1.Mechanical, electrical
2.Heat, Mechanical
3.Electrical, Heat
4.Heat,Electrical
5.None of these
Answer – 2.Heat, Mechanical
Explanation :
In a heat engine Heat energy changes into Mechanical energy

10. In electric motor ………………….. energy changes into …………………. energy
1.Mechanical, electrical
2.Heat, Mechanical
3.Electrical, Mechanical
4.Heat,Electrical
5.None of these
Answer – 3.Electrical, Mechanical
Explanation :
In electric motor electrical energy changes into mechanical energy

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