Physics Past Questions and Answers

I.Chemical II.Sound III.Electricity
Which of the above forms of energy can directly be converted to light energy?

If the distance between the object and the pinhole of a pinhole camera is reduced by half the size of the image of the object

An object is placed 15cm in front of a plane mirror. If the mirror is moved further 5cm away from the object and the image is

Which of the following statements is correct about a machine?

The instrument used to view stars is the