A ball thrown up vertically returns to the ground after 10 second. Find the velocity with which it was thrown up? (if g = 10 m/s2).

Given in the options are sets of particular characteristics of elements and how they vary across the period and down the group in the following format:

Characteristic of an element — Across the period — Down the group Select the correct set from the given options.

An object of 1.2 cm height is placed 30 cm before a concave mirror of focal length of 20 cm to get a real image at a distance of 60 cm from the mirror. What is the height of the image formed?

Which of the following Scientific Instruments is used to measure the Speed, Direction and Pressure of the Wind?

Which of the following electromagnetic waves helps our body synthesise Vitamin D?