Question Discussion & Solution

The logic here is

The Opposite letter of first letter is third letter.

Second letter + 1 = third letter

Option 1 : DVW

Option 2 : GST

Option 3 : JPQ

Option 4 : MNK

From the above options 1, 2 and 3 follow the same logic and option 4 does not follow the same logic.

Hence, "MNK" is the answer. 

Concept:

• Heat Transfer: Heat is transferred from one place to another in substance due to temperature difference. 

• Evaporation: In this process, the liquid form a substance tends to convert in the gaseous phase on the uppermost surface due to heat and pressure.
• Condensation: In this process, the gaseous phase of an object tends to convert into liquid form due to pressure and temperature.

Explanation:

The other end of a wooden spoon will not become cold when it is dipped in a cup of ice cream because wood is a bad conductor, not a good conductor.

The logic followed is:

The phenomenon of global warming is a serious problem (cause) and the rise in the sea level is a major effect of the same.

So, II is the main cause and I is the main effect.

Hence, the correct answer is "Option 3".

Additional Information 

What are Causes?

Causes are the conditions under which an event occurs.

For example, can you guess the causes for the following? 

The police increased security around the President's house.

Lots of people buy a particularly expensive brand of washing machines around Diwali. Easily, we can guess the causes for the above events. 

There were reports of threats against the President. 

There was a high discount or sale for that brand during Diwali.

Sufficient & Necessary Conditions:

In a cause and effect question, the cause is the sufficient condition. It is assumed that the sufficient condition of the occurrence of the events must include the different necessary conditions as well. 

A necessary condition is one that must be satisfied for the occurrence of an event. 

E.g. You must adhere to the deadline to get your work appraised. 

This means if you get your work appraised, you have to adhere to the deadline. Or; if you do not adhere to the deadline, you do not get your work appraised. 

A condition is called a sufficient condition if in a certain event, you are satisfied with the results.

E.g. Being human is a sufficient condition for being a mammal. The act of being a human is not possible unless one is also a mammal. But it is not necessary that being human is a necessary condition for being a mammal. 

The correct answer is 1-B, 2-A, 3-D, 4-C.

Key Points

Additional Information

The correct answer is Butane.

Key Points 

• Liquefied Petroleum Gas (LPG) is a blend of light hydrocarbon compounds.
  • It mainly consists of butane or propane or a mixture of both.
  • At room temperature, both gases are colourless and odourless.
  • It is a mixture of 48% propane, 50% butane, and 2% pentane.

Additional Information

• Water Gas:
  • Water-gas is a mixture of CO and H₂.
  • However, by-products such as char, tar, soot, ash, and condensates are also produced. 
• Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.
• Compressed natural gas is a fuel that can be used in place of petrol (gasoline), diesel fuel, and liquefied petroleum gas (LPG).
  • CNG combustion produces fewer undesirable gases than the aforementioned fuels.
  • In comparison to other fuels, natural gas poses less of a threat in the event of a spill, because it is lighter than air and disperses quickly when released.