Gravitation — Science STD 9 — Question

Molecular mass of nitric acid is:

When an object is thrown up, the force of gravity.

How many moles are present in 11.5g of sodium?

‘X’ and ‘Y' are two elements which form X₂Y₃ and X₃Y₄. If 0.2mol of X₂Y₃ weighs 32g and 0.4mol of X₃Y₄, weighs 92.8g, the atomic weights of X and Y respectively are:

Avogadro number is the number of atoms present in exactly:

Silver nitrate solution is used to study:

Earthquake produces which kind of sound before the main shock wave begins:

9800 joule of energy was spent to raise a mass of 50kg, the mass was raised to a height of:

42. A bus moving along a straight line at 20m/s undergoes an acceleration of 4m/s². After 2 seconds, its speed will be:

1. 8m/s
2. 12m/s
3. 16m/s
4. 28m/s

Which of the following is unit of power?