Question Discussion & Solution

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. 

Concept:

In general, each object contains three object associated attributes:

• Object prototype: It is kind of reference/indication to another object from which properties are inherited.
• Object class: It is a kind of string which classifies the type an object.
• Object's extensible flag: It simply specifies that whether some new properties are added to the object

The correct answer is ALGORITHM.

Key Points

• An algorithm is a specific procedure for solving a well-defined computational problem.
• The development and analysis of algorithms are fundamental to all aspects of Computer Science like AI, databases, graphics, networking, OS, etc.
• Algorithm development is more than just programming.
  • It requires an understanding of the alternatives available for solving a computational problem.
  • It includes the hardware, networking, programming language, and performance constraints that accompany any particular solution.

Additional Information

• An official language comprising a collection of instructions that produce different kinds of output is a programming language.
• In computer science, programming languages are used to implement algorithms.
• Most of the languages of programming consist of computer instructions.

The correct answer is Boy pushing wall in a room.

Key Points

• Boy pushing the wall in the room is not an example of work done.
  • When a boy pushes a wall, he is applying force on the wall. We see that the wall shows no displacement.
  • Work is given as the product of the forces and the displacement in the same direction.
  • Hence the work done is zero.

Additional Information

• Work is done when a force moves. Everyday examples of work include walking up a flight of stairs, lifting heavy objects, pulling a sled and pushing a shopping trolley, Applying pressure on a pebble lying on the surface, raising a book to a height.
  • Work is not done when holding a bag stationary or a book at arm's length because although a force is being applied, the force does not move.

Concept-

• We know that all living organisms need food.
• Food supplies proteins, carbohydrates, fats, vitamins, and minerals, all of which we require for body development, growth, and health.
• Both plants and animals are major sources of food for us.
• We obtain most of this food from agriculture and animal husbandry.
• Cereals such as wheat, rice, maize, millets, and sorghum provide us carbohydrates for energy requirements.

Explanation-

The principal food crop of the world is wheat.

• Wheat is a Rabi crop that belongs to the Gramineae family.
• The scientific name of rice is Triticum aestivum.
• Wheat is the principal crop for millions of people in the world.
• Wheat grain is used for cooking.
• So, it is the principal cereal crop compared to rice, maize, and barley. 

Additional Information

• The major food crop of the world that belongs to the family is Gramineae. 
• Gramineae is also known as the Poaceae is the family that contains all the major crops that belong to the grass family.
• Poaceae or Gramineae is the most economically important plant family, providing staple foods from domesticated cereal crops as well as feed for meat-producing animals. 
• Examples such as maize, wheat, rice, barley, and millets, etc.