C++ | MCQs

Explanation

CNG (Compressed Natural Gas) is primarily composed of methane.

When comparing the burning efficiency of CNG to other gases

It is generally understood that CNG burns less efficiently than Propane

Propane has a higher energy content per unit volume compared to methane, meaning it can produce more energy when burned.

Explanation

Joseph Priestley invented soda water in 1767 by infusing water with carbon dioxide.

His method laid the foundation for carbonated beverages.

Explanation

Thermal cracking is a process in which high temperatures are used to break down large hydrocarbon molecules into smaller, more useful molecules.

Such as gasoline and diesel.

This process is widely used in the petroleum industry.

Explanation

Smoke is an example of solid in gas.

As it consists of tiny solid particles suspended in the air.

It is a gas.

Explanation

A carbocation is a carbon atom with a positive charge attached to three other atoms or groups.

Explanation

Potassium ferrocyanide ​ [K[Fe(CN) 6] is an example of a complex salt

Because it contains a central metal atom (iron) bonded to ligands (cyanide ions)

Explanation

Electrolysis, which uses electricity as a catalyst, is the process of separating water (H2O) into oxygen (O2) and hydrogen (H2).

When an electric current is passed through water, it causes the water molecules to split into their component gases.

Explanation

The molar mass of CaCO₃ is approximately 100 g/mol.

The molar mass of calcium (Ca) in CaCO₃ is about 40 g/mol.

The proportion of calcium in CaCO₃ is  40/ 100 = 0.4

Therefore, in 0.1 g of CaCO₃, the amount of calcium is  0.1×0.4=0.04 g.

Explanation

Transistors primarily act as current amplifiers in a circuit.

They can increase the current flowing through a circuit, which can also be used for voltage amplification and switching.

Explanation

A moving charged particle is surrounded by both an electric field and a magnetic field.

The electric field is due to the charge itself, and the magnetic field is generated due to the particle's motion.