Consider the following statements:

1. A flute of smaller length produces waves of lower

Who among the following is credited with the discovery of X-rays?

Smog is a combination of –

Bronze is an alloy of-

Which of the following statements is incorrect?

In the atmosphere ultraviolet rays are absorbed by –

The apparatus used in the refrigeration is

With reference to the types of electromagnetic waves, consider the following statements:

I threw a ball horizontally on the road and after covering certain distance, the ball stopped due to

The energy of wind is-