Question Discussion & Solution

Given: Girl, Boy, Human

All human are boy and girl.

The correct answer is Software program.

• An operating system is system software that manages computer hardware, software resources, and provides common services for computer programs. Operating systems are found on many devices such as a computer, mobile phones, video games etc.
• Software program
  • It is a set of instructions, or a set of modules or procedures, through which computer operation is performed.
  • It is often called a software application and a software product.

Additional Information

• Computer system
  • A Computer system is usually defined as a combination of both hardware and software working together.
  • Hardware is the physical components of a computer and software is the programs that run on a computer.
• Network
  • It is a collection of computers, servers, mainframes, network devices, peripherals, or other devices connected to one another to allow the sharing of data.
  • E.g - The Internet, often referred to as the ‘Net’, consists of a complex network of computers connected by high-speed communication technologies like satellites, microwave devices, etc.
• Hardware device
  • Computer hardware includes the physical parts of a computer, such as a case, central processing unit (CPU), monitor, mouse, keyboard, computer data storage, graphics card, sound card, speakers and motherboard.
  • It accepts the data (input) from the user.
  • The computer has memory chips, which are designed to hold data until it is needed.
  • It processes this data into information. The computer has an electronic brain called the Central Processing Unit, which is responsible for processing all data into information according to the instructions given to the computer.
  • It then returns the processed information (output) to the user.

The correct answer is 1939.

Key Points

Congress Party: 

• An Indian political party founded in 1885 as Indian National Congress.
• Founded by Allen Hume, a British colonist and, until World War-I it was a moderate body.
• Later, under the leadership of Mahatma Gandhi, it began a campaign of non-violent non-cooperation.
• It was declared illegal between 1932-34. It led the movement to end British rule and was the government party after independence from 1947-77.

Key people-Congress Party Leader: 

•  Maulana Abul Kalam Azad (1888-1958): Leading Muslim member of Congress Party; Congress president, 1940-1946; Indian education minister after independence.
•  Mohandas Karamchand Gandhi (Mahatma) (1869-1948):  Studied law in London; 1893-1914, worked in South Africa; on return to South Africa, rose to dominance in Congress Party, becoming its president in 1924. Led a number of civil disobedience campaigns, spending a number of spells in prison. Made numerous attempts between 1944-1947 to stop the partition of India but failed. Assassinated, 1948.
• Jawaharlal (Pandit) Nehru(1889-1964) Barrister and politician in the United Provinces of India; supporter of Gandhi; President of Indian National Congress, 1929, 1936-37, 1946, 1951-54; first prime minister of India, 1947-1964.

People – A, B, C, D, E and F

All are facing north.

1. C is sitting 2^nd to the left of D.

2. Only two person sits between A and B.

3. E is sitting at the extreme left end and neither F nor A is the immediate neighbour of E.

4. B is sitting to the left of A.

As, F and A are not the immediate neighbours of E, Case I is eliminated and the arrangement with the combination of Case II, thus formed is:

Hence, D is at the extreme right end.

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency.

Key Points

• Valency is the no of electron that looses, shared or gain to achieve stability or we can say to complete it outer most shell. 
• If any element has valence electron (electrons present in outer most shell) less than 4
  • ​​Valency = no of valance electron (valence electron<4)
• If any element has valence electron ​more than 4
  • ​​Valency = 8 - no of valance electron (valence electron>4)

​For Lithium:

• Li(Z=3) Electronic configuration = 2, 1
  • Valency = no of valance electron  = 1

​Hence, we can conclude that 1 is the valency of Lithium.