Which of the following is an example of a scalable

Lines joining places of equal temperature are called 

Which of the following force holds protons and neutrons inside the nucleus of an atom?

When carbon dioxide gas is passed through lime water, a white precipitate is formed, which dissolves on

A piece of wood is held under water. The up thrust on it will be:

A cylindrical metal wire is reformed so that its length decreases by 20% with no change of volume. Its

resistance decreases by:

A body of mass 4 kg falls freely from a height of 5 m. What is its kinetic energy just before it hits the ground? (Take g = 10m/s²)

Which of the following is the first organic compound that was synthesised in the laboratory?

An ice block with a piece of lead embedded in it floats in water. If ice melts the water level –

Which of the following solutions will not change the colour of blue litmus paper to red?

 1. Acid solution

2. Base solution