What will be the speed of a wave whose wavelength is 400 m and time period is 0.4 sec?

Amount of heat energy produced on­­­­_______ combustion of 1Kg of fuel is calorific value.

Calorific value refers to the amount of heat produced by the unit volume of a substance by complete combustion. In an experiment, 5.4 kg of fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.

What is the nature of manure?

Urea and ammonia are the examples of;

0.0000463 in standard form is

0.000367 × 10⁴ in usual form is

A pole 14 m high casts a shadow of 10 m. At the same time, what will be the height of a tree, the length of whose shadow is 7 metres?

3 persons can build a wall in 4 days, then 4 persons can build it in