Questions

Isotopes are atoms of the same element that have different mass numbers.

Example : Hydrogen, Deutirium and tritium all these have different mass but same atomic numbers.

Burning the candle at both ends meaning is to overwork starting early in the morning and staying till late nights.

Collisions occur at curves because speed on the approach is too great.

The federal government debt is equal to the sum of past budget deficits minus the sum of past budget surpluses.

Among the given options, CH4 is a non polar molecule with symmetrical tetrahedral shape.

The mammalian heartis called myogenic (myo = muscle, genie = originating from). It means the heart beat or the activities of the heart are auto regulated which originates from a muscle called nodal tissue.In the human heart,heartbeat originates and contraction is initiated by a special modified heart muscle known as sinoatrial node. It is located in the right atrium; while the QRS waves are the depolarisation of the ventricles, which initiates the ventricular contraction.The T-wave represents the repolarisation,that is, the return of the ventricles from excited tonormal state.Hepatic portal system is the unique vascular connection that exists between the digestive tract and liver. This vein carries blood from intestine to the liver.