List of practice Questions

Why is one of the pins of a three-pin plug relatively thicker?
State one advantage of using an MCB.
What types of images are formed by a convex lens?
What is meant by "refractive index of water is \(1.33\)"?
An object of size \(4.0\text{ cm}\) is placed \(25.0\text{ cm}\) in front of a concave mirror of focal length \(15.0\text{ cm}\). At what distance from the mirror should a screen be placed to obtain a sharp image? Determine the nature and size of the image.
A doctor prescribed a corrective lens of power \(+1.5\text{ D}\). Determine the focal length of the lens. Is the prescribed lens diverging or converging?
Which type of mirror is used in the rearview mirror of vehicles and why?
What is the function of the earth wire?
State Joule's laws of heating regarding electric current.
Which metal is generally used to make the filament of an electric bulb?
What is the difference between overloading and short circuit?
Write two properties of a fuse wire.
Which energy is converted into which energy in an electric generator?
Name a device that helps to maintain a potential difference across a conductor.
What is the direction of magnetic field lines inside a current-carrying solenoid?
The refractive index of glass is \(1.5\) and that of water is \(1.33\). In which medium will light bend more? Explain with reason.
What is meant by accommodation of the eye?
A student sitting in the back row has difficulty seeing the blackboard. What kind of defect might the student's eye have? How can it be corrected?
A person's near point is \(50\text{ cm}\). His far point is \(2\text{ m}\). What is the name of the defect of vision he is suffering from?
Suggest the use of suitable lenses for the correction of each defect mentioned in the previous question.
Why is the use of iodized salt logical/recommended?
To get a real image of the same size as the object, where should the object be placed in front of a convex lens?
The action of which of the following changes the focal length of the eye lens?
During a short circuit, the current in the circuit -
What is the S.I. unit of resistance?