Physics Past Questions and Answers

An electric cell has an internal resistance of \(20 hm\). A current of \(0.5 A\) is found to flow when a resistor of \(50 hms\) resistance is connected across it.
What is the electromotive force of the cell ____________

A concave lens of focal length \(20 cm\) forms an image \(1 / 2\) the size of the object.
The object distance is ____________

Which of the following electromagnetic waves length?

Which of the following statements is correct?
Silvered walls of a vacuum flask are used to prevent ____________

The point beyond which a stretch spring does not return to its original length is called the ____________