The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

A boy goes from A to B with a velocity of 20 m/min and comes back from B to A with a velocity of 30 m/min. The average velocity of the boy during the whole journey is

Velocity is defined as ……………. per unit time.

Speed is scalar quantity and velocity is ……………… quantity.

If speed of a body is continuously decreasing, the body is said to

Area of speed-time graph gives

Which of the following are covered by a single membrane?

The relative molecular mass of Na2S2O3.5H2O is

What mass of carbon dioxide (CO2) will contain 3.011 × 1023 molecules?

How many times an atom of sulphur is heavier than an atom of carbon?

How many mole in 64 g of O2

Slope of a velocity-time graph gives

Which of the following are covered by a single membrane?

The cell organelle involved in forming complex sugars from simple sugars are

Which out of the following is not a function of vacuole?

Amoeba acquires its food through a process, termed