Sound — Science STD 9 — Question

Four elements W, X, Y and Z contain 8, 11, 9 and 17 protons per atom respectively. The element which cannot form an anion is most likely to be:

When sound travels through air, the air particles:

An element has electronic configuration 2, 8, 4. It will be classified as:

An electric lamp of 100w is used for 5 hours per day calculate the units of energy consumed by lamp in one day:

Slope of a velocity – time graph gives:

Which kind of sound is produced in an earthquake before the main shock wave begins?

A freely falling object eventually stops on reaching ground. What happens to its potential and kinetic energy while falling?

When we increase the loudness of sound of a TV, the property of sound that changes is:

Which one of the following scrap metal cannot be separated by magnetic separation?

In Rutherford's α-rays scattering experiment, gold foils are used because of ___________?