An object of height 1.2m is placed before a concave mirror of focal length 20cm so that a real image is formed at a distance of 60cm from it. Find the position of an object. What will be the height of the image formed?

Mention any one point of difference between Pepsin and Trypsin.

An element “X” has mass number 35 and the number of neutrons is 18. Identify the group number and period of “X”.

Why is there a need to harness non-conventional sources of energy? Give two main reasons.

Name the electric device that converts mechanical energy into electrical energy. Draw the labelled diagram and explain the principle involved in this device.