What is the difference between a CFL and an LED lamp?
1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
2. The average life span of a CFL is much longer than that of an LED lamp
3. A CFL is less energy-efficient as compared to an LED lamp.
Which of the statements given above is/are correct?

Which one of following reflects back more sunlight as compared to other three?

Seawater (i.e. saltwater) freezes at:

The Indian population receives the largest dose of ionizing radiation from:

What range of frequencies are usually referred to as audio frequencies for humans?

Titan is the largest natural satellite of planet

Water boils at a lower temperature on the hills because

Which is the longest?

Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?

The most serious environmental pollution from a nuclear reactor is