An object becomes positively charged when it
a. loses electrons.
b. loses protons.
c. gains electrons.
d. gains neutrons.

The correct answer is Option a.

Explanation:

There are 3 sub-atomic particles in an atom.

1.) Protons: These particles are positively charged particles and are present inside the nucleus.

2.) Electrons: These particles are negatively charged particles and are present around the nucleus. These can be easily lost or gained. When the electrons are lost, the atom will gain a positive charge and when electrons are gained, the atom will carry a negative charge.

3.) Neutrons: These particles does not carry any charge on them and their loss or addition will not cause any effect on the atom.

Hence, the correct answer is option a.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.