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steam engine to dream engine

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Hi guys Let me introduce you a very special topic i.e. From steam engine to dream engine. The technological and continuous transformation has opened various ways with boundless possibilities. Industrial revolution sparked by steam engine has taken steps towards digital revolution driven by artificial intelligence. So let's learn about the journey travelled by engine which helped us to enhance our daily lives and make the world a single family by means of globalisation. It is the symbol of the progress of development and innovation for humanity. The birth of steam engine The steam engine invented in late 17th century . Before it's innovation human labour and animal power was the primary source of energy. Firstly it was developed by Thomas newcomens in the early 17th century which is used to pump water out of mines. After that in the 1760s it is the James Watt who makes a improvement in it and add seperate condenser and rotary motion due to which use of the engine enh...
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25 MCQ question based on electric charges and fields

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1. What is the unit of electric charge?
a. Ampere
b. Coulomb
c. Volt
d. Joule
Answer: b. Coulomb. Coulomb is the unit of electric charge.

2. What is the SI unit of electric field strength?
a. Tesla
b. Gauss
c. Newton
d. Volt per meter
Answer: d. Volt per meter. The SI unit of electric field strength is volt per meter.

3. Which of the following is not an example of a charged object?
a. Electron
b. Proton
c. Neutron
d. All of these are charged objects
Answer: c. Neutron. Neutrons do not have any charge.

4. What is an electric field?
a. A region where electric charges are absent
b. A region where electric charges are just visible
c. A region around a charged object in which an electric force is exerted on another charged object
d. A region where electric charges become neutral
Answer: c. A region around a charged object in which an electric force is exerted on another charged object. This region is known as the electric field.

5. What is the formula for electric field strength?
a. E = F/Q
b. E = Q/F
c. E = V/I
d. E = I/V
Answer: a. E = F/Q. Electric field strength is defined as the force experienced by a unit charge placed in an electric field.

6. What is an electric dipole?
a. A charge with zero electric field
b. Two opposite charges of equal magnitude separated by a distance
c. Two similar charges separated by a distance
d. A charge with a non-zero electric field
Answer: b. Two opposite charges of equal magnitude separated by a distance. An electric dipole is a pair of equal and opposite charges separated by a distance.

7. What happens to the electric field as you move away from a point charge?
a. It decreases
b. It increases
c. It remains constant
d. It becomes zero
Answer: a. It decreases. The electric field strength decreases as you move farther away from a point charge.

8. What is the direction of the electric field due to a positive charge?
a. Towards the charge
b. Away from the charge
c. Parallel to the charge
d. None of the above
Answer: a. Towards the charge. The direction of the electric field due to a positive charge is towards the charge.

9. What is the direction of the electric field due to a negative charge?
a. Towards the charge
b. Away from the charge
c. Parallel to the charge
d. None of the above
Answer: b. Away from the charge. The direction of the electric field due to a negative charge is away from the charge.

10. What is an electric conductor?
a. A material that allows electric charges to move freely
b. A material that does not allow electric charges to move freely
c. A material that produces electric charges
d. None of the above
Answer: a. A material that allows electric charges to move freely. Electric conductors allow electric charges to move freely through them.

11. What is an electric insulator?
a. A material that allows electric charges to move freely
b. A material that does not allow electric charges to move freely
c. A material that produces electric charges
d. None of the above
Answer: b. A material that does not allow electric charges to move freely. Electric insulators do not allow electric charges to move freely through them.

12. What is the electric potential energy of a charged object at rest?
a. Zero
b. Positive
c. Negative
d. Cannot be determined
Answer: a. Zero. The electric potential energy of a charged object at rest is zero.

13. What is the relationship between electric potential and electric potential energy?
a. They are the same thing
b. Electric potential is the rate at which electric potential energy changes
c. Electric potential energy is the rate at which electric potential changes
d. There is no relationship between them
Answer: b. Electric potential is the rate at which electric potential energy changes. Electric potential is defined as the electric potential energy per unit charge.

14. What is an equipotential surface?
a. A surface on which the electric potential is zero
b. A surface on which the electric field is zero
c. A surface on which the electric potential is constant
d. A surface on which the electric field is constant
Answer: c. A surface on which the electric potential is constant. Equipotential surfaces are surfaces on which the electric potential is constant.

15. What happens to the work done on a charged object as it moves in an electric field along an equipotential surface?
a. It is zero
b. It is positive
c. It is negative
d. Cannot be determined
Answer: a. It is zero. The work done on a charged object as it moves in an electric field along an equipotential surface is zero.

16. What is the relationship between electric potential and electric field strength?
a. They are the same thing
b. Electric potential is the negative of electric field strength
c. Electric potential is the gradient of electric field strength
d. Electric potential is the derivative of electric field strength
Answer: c. Electric potential is the gradient of electric field strength. Electric potential is the rate of change of electric field strength with respect to distance.

17. What is the direction of the electric field at a point on an equipotential surface?
a. Parallel to the surface
b. Perpendicular to the surface
c. Tangential to the surface
d. None of the above
Answer: b. Perpendicular to the surface. The electric field is always perpendicular to an equipotential surface.

18. What is the formula for electric potential energy?
a. U = qV
b. U = V/q
c. U = I/V
d. U = V/I
Answer: a. U = qV. Electric potential energy is defined as the work done by an external force in moving a charge from one point to another in an electric field.

19. What is the principle of superposition?
a. The sum of two electric fields is the electric field due to the combination of the two sources
b. The electric field due to a charged object is directly proportional to the square of the distance from the object
c. The electric field due to a point charge is inversely proportional to the distance from the charge
d. None of the above
Answer: a. The sum of two electric fields is the electric field due to the combination of the two sources. According to the principle of superposition, the electric field due to a combination of sources is the sum of the electric fields due to each individual source.

20. What is Gauss's law?
a. The electric field due to a charged object is directly proportional to the square of the distance from the object
b. The electric field due to a point charge is inversely proportional to the distance from the charge
c. The electric flux through a closed surface is proportional to the charge enclosed by the surface
d. None of the above
Answer: c. The electric flux through a closed surface is proportional to the charge enclosed by the surface. Gauss's law relates the electric flux through a closed surface to the charge enclosed by the surface.

21. What is the formula for electric flux?
a. Φ = E·A
b. Φ = A/E
c. Φ = Q/A
d. Φ = A/Q
Answer: a. Φ = E·A. Electric flux is defined as the number of electric field lines passing through a surface per unit area.

22. What is the direction of the electric flux through a closed surface due to a positive charge located within the surface?
a. Outward
b. Inward
c. Zero
d. Cannot be determined
Answer: a. Outward. The electric flux through a closed surface due to a positive charge located within the surface is outward.

23. What is the formula for the electric field due to an infinite sheet of charge?
a. E = σ/ε0
b. E = ε0/σ
c. E = λ/2πε0r
d. E = kQ/r^2
Answer: a. E = σ/ε0. The electric field due to an infinite sheet of charge is given by E = σ/2ε0, where σ is the surface charge density.

24. What is the formula for the electric potential due to an infinite line of charge?
a. V = kλ/r
b. V = kQ/r
c. V = λ/2πε0
d. V = σ/ε0
Answer: a. V = kλ/r. The electric potential due to an infinite line of charge is given by V = kλ/r, where λ is the line charge density.

25. What is the formula for the electric field due to a dipole at a point on the dipole axis?
a. E = 2kqd/r^3
b. E = kqd/r^3
c. E = 2kpd/r^3
d. E = kpd/r^3
Answer: b. E = kqd/r^3. The electric field due to a dipole at a point on the dipole axis is given by E = kqd/r^3, where d is the distance between the charges of the dipole.     





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