The mass of piece of paper is 0.02g and the mass of a solid substance along with the same piece of paper is 20.036g . If the volume of the solid is `2.16 cm^(3)` ,calculate the density of the substance up to proper number of significant digits.

The volume of 50 g of a substance is 20 cm^3 . If the density of water is 1 gcm^-3 , will the substance float or sink ?

The mass and volume of a body are 4.237 g and 2.5 cm^3 , respectively. The density of the material of the body in correct significant figures is :

The mass of a box measured by a grocer’s balance is 2.300 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is:- the difference in the masses of the pieces to correct significant figures ?

Silver crystallisaes in fcc lattice. If the edge length of th cell is 4xx10^(-8) cm and density is 11.2 g "cm"^(-3) , calculate the atomic mass of silver.

A horizontal disc rotating about a vertical axis makes 100 revolutions per minute. A small piece of wax of mass 10 g falls vertically on the disc and adheres to it at a distance of 9 cm from the axis. If the number of revolutions per minute is there by reduced to 90, calculate the moment of inertia of the disc.

The mass of a box measured by a grocer's balance is 2.3 kg. Two gold pieces of masses 20.15g and 20.17 g are added to the box. What is the total mass of the box

On dissolving 0.25 g of a non-volatile substance in 30 mL of benzene (density 0.8 g "mol"^(-1) ) its freezing point decreases by 0.40^(@)C . Calculate the molecular mass of the non-volatile substance. ( K_(f) for benzene is 5.12 k m^(-1) )