Tag: evs

Questions Related to evs

In which form, the energy is stored in a fuel?

evs how to save fuel lpg, cng treasures from the earth fuel and conservation

  1. Potential energy

  2. Thermal energy

  3. Kinetic energy

  4. All of the above

Show answer
Correct Option: A
Explanation:

Fuels store the energy in form of potential energy and it can be released to do work.

The most common sources of energy are:

evs how to save fuel lpg, cng treasures from the earth fuel and conservation

  1. wood and coal

  2. petroleum and coal

  3. LPG and cow dung

  4. natural gas and wood

Show answer
Correct Option: B
Explanation:

Fossil energy like coal, lignite, petroleum and natural gas are most common sources of energy. These sources of energy are used to produce electricity, cook food, heat thermal engines etc. 

Cleaner fuel among the following is:

evs how to save fuel lpg, cng treasures from the earth fuel and conservation

  1. petrol

  2. kerosene

  3. diesel

  4. compressed natural gas

Show answer
Correct Option: D
Explanation:

Compressed natural gas is a cleaner fuel because it causes less pollution by emitting lesser pollutants like carbon dioxide, nitrogen oxides, sulphur oxides, carbon monoxides, unburnt hydrocarbons etc.

Secondary fuel among the following is:

evs how to save fuel lpg, cng treasures from the earth fuel and conservation

  1. methanol

  2. water gas

  3. LPG

  4. all of the above

Show answer
Correct Option: D
Explanation:

The artificial fuel which is made of chemical conversions or the fuel which we get by processing the primary fuel is called secondary fuel. Methane, water gas and LPG are secondary fuel.

Nuclear fuel among the following is:

evs how to save fuel lpg, cng treasures from the earth fuel and conservation

  1. uranium

  2. plutonium

  3. both A & B

  4. carbon

Show answer
Correct Option: C
Explanation:

Nuclear fuel is the one which store their energy in the form of nuclear energy and whose nuclei are unstable and undergoes fission.Uranium and plutonium are examples of nuclear fuel.

CNG is more polluting fuel than petrol and diesel.

evs how to save fuel lpg, cng treasures from the earth fuel and conservation

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Compressed natural gas (CNG) is less polluting fuel than petrol and diesel.

Paraffin wax is a solid product obtained from petroleum. Some of its uses are mentioned here. Mark the wrong one?

evs how to save fuel lpg, cng treasures from the earth fuel and conservation

  1. In greases for axles of motor vehicles

  2. As a coating on paper

  3. In the making of candles

  4. As a stiffening agent in cosmetic creams

Show answer
Correct Option: A
Explanation:

Fractional distillation of petroleum yields paraffin wax which is generally used to treat conditions like arthritis and fibromyalgia, as a coating on paper, in making candles; as a stiffening agent. 

It is not used as grease.

Compared to oil, an advantage of using natural gas is that it:

evs how to save fuel lpg, cng treasures from the earth fuel and conservation

  1. prevents respiratory problems

  2. prevents headaches

  3. causes less air pollution

  4. prevents over combustion

Show answer
Correct Option: C
Explanation:

Natural gas tops other fossil fuels when it comes to clean burning. Since the process of natural gas combustion is almost up to the mark, the level of byproducts disseminated to the environmental is little. In addition, advances in technologies have massively reduced nitrogen oxide, a common pollutant emitted by natural gas. The blue flame witnessed during the process of burning natural gas is an indication that the gas is burning perfectly.

The engines of the rocket that helped the Apollo $11$ spacecraft to land on the moon, used for rocket fuel power.

evs how to save fuel lpg, cng treasures from the earth fuel and conservation

  1. Hydrazine

  2. Hydrogen

  3. Oxygen

  4. Propane

Show answer
Correct Option: A
Explanation:
 Hydrazine, $\left( {N} _{2}{H} _{4} \right)$
Substance used for launching rocket are called rocket propellant. 
A propellant have two part-
  1. fuel
  2. oxidiser
Liquid propellant: fuel and oxidiser both are liquid.
  • fuel (kerosene, ${N} _{2}{H} _{4}$, liquid ${H} _{2}$)
  • oxidiser($liq.{O} _{2}, \; {N} _{2}{O} _{4}$)

Hydrogen gas is obtained from:

evs how to save fuel lpg, cng treasures from the earth fuel and conservation

  1. petroleum

  2. coal

  3. coke

  4. natural gas

Show answer
Correct Option: D
Explanation:

Fossil fuels are the dominant source of industrial hydrogen. Carbon dioxide can be separated from natural gas with a 60-70% efficiency for hydrogen production and from other hydrocarbons to varying degrees of efficiency.Specifically, bulk hydrogen is usually produced by the steam reforming of methane or natural gas.