RRB JE EE CBT 2 Full Test 1 - Railways MCQ

CTRL + D closes the command line shell. This sends an EOF (End of file) marker to shell, and shell exits when it receives this marker. This is similar to running the exit command.

System software is a type of computer program that is designed to run a computer's hardware and application programs. If we think of the computer system as a layered model, the system software is the interface between the hardware and user applications.

Yakshagana is a popular folk-theatre form of Karnataka with a long history of nearly four hundred years. It is a unique harmony of musical tradition, eye-catching costumes, and authentic styles of dance, improvised gestures and acting with its extemporaneous dialogue appealing to a wide range of the community. It is a vibrant and vigorous living form of theatre art.

• The Ramon Magsaysay Award is an annual award established to perpetuate former Philippine President Ramon Magsaysay's example of integrity in governance, courageous service to the people, and pragmatic idealism within a democratic society.
• The prize was established in April 1957 by the trustees of the Rockefeller Brothers Fund based in New York City with the concurrence of the Philippine government.

Through the 42nd Amendment Act of 1976 five subjects were transferred from State to Concurrent List.
They are:
1. Education
2. Forests
3. Weights & Measures
4. Protection of Wild Animals and Birds
5. Administration of Justice

Ubuntu, Linux, Unix, Microsoft Windows and macOS all fall under the category of operating systems.

An Operating system is basically a low-level system software and an important program that runs on every computer. Its basic function is to perform basic tasks such as controlling peripherals, managing computer software and hardware resources, keeping track of directories and files in the storage drive, sending output to the display and more.

• Carbon dioxide is responsible for trapping heat energy from the Sun within the Earth's atmosphere by preventing the rays of the Sun from escaping into the atmosphere. 
• This leads to an increase in the overall temperature and this phenomenon is called global warming.

An input device is any hardware device that sends data to a computer, allowing you to interact with and control it.

An output device is any hardware that sends data from a computer to another device mostly in form of audio or video.

• Scanner scans any document and sends it to computer, so it is a input device.
• Speaker gets data from computer in form of audio. So it is a output device.
• Plotter is printer that print vector image. It recieve data from computer and print it on paper. So it is also a output device.

The capacitor bank installed in the rectifier system of any electroplating plant is to improve the power factor and the line regulation of the mains feeding the rectifier system.

The materials used for heating element should have the following properties
1. High specific resistance
2. High melting point
3. Low temperature coefficient of resistance
4. Free from oxidation
5. High mechanical strength
6. Non corrosive
7. Economical

In a domestic baking oven, the temperature is controlled by series parallel operation. In this method, the heating elements can be connected in series for the low temperatures and connected in parallel for the high temperature by means of a series parallel switch.

The home page is the first page that we see when a website is opened on the web browser. It is also called the start page or the main page, though home page is a more commonly used name. It is generally made attractive and contains various hyperlinks to different pages within the web site to attract visitors to its site. Some web sites require users to login to the web site to access the home page.

• Burzail Pass connects the Kashmir valley with Deosai Plains of Ladakh.
• It remains covered in snow during the winter.

USB root hub is the software driver that connects multiple USB peripherals to the computer. Root hub is connected to the processor through Bus.

• Acetic acid, commonly named ethanoic acid, is a colorless liquid organic compound with the chemical formula CH₃COOH.
• When undiluted, it is sometimes called glacial acetic acid.

A toggle key toggles the input from other keys on the keyboard between different input modes.

• The most commonly used toggle key is the caps lock key, which alternates the letter keys between uppercase and lowercase
• Num lock is another toggle key which helps to input numerals from the numeric keyboard and is turned on by default
• Scroll lock key allows arrow keys to scroll through window's contents and allows users to scroll without depending on the scroll bar
• The insert key is another example of a toggle key, and it toggles between overtype mode and insert mode while entering text

By nodal analysis,

1.5V_A - 4.5 + V_A = 18
2.5 V_A = 22.5
V_A = 9 V

Current through E₂ branch = I₁ - I₂ = 5 - 4 = 1 A
This 1 A current will flow downward direction. Hence it is charging current for battery E₂.

Resistance between A and B = 1 + 0.875 = 1.875Ω

For large networks generally, the node analysis is preferred because it involves lesser number of equations.

Kirchhoff's Current Law (KCL) or Node Analysis
Kirchhoff current law states that the algebraic sum of all currents entering a node of a circuit is always zero.

First find total Resistance seen by voltage source Here 3Ω and 6Ω are connected in parallel.


Total Resistance = 2 + 1 = 3Ω

∴ Power supplied by DC source P = VI = 3 × 1 = 3W

Fifth Generation (Present and Future):

• 5th generation computers use ULSI (Ultra-Large Scale Integration) chips
• Millions of transistors are placed in a single IC in ULSI chips
• 64-bit microprocessors have been developed during this period
• Memory chips and flash memory up to 1 GB, hard disks up to 600 GB & optical disks up to 50 GB have been developed
• Fifth generation computing devices, based on Artificial Intelligence, are still in development, though there are some applications, such as voice recognition, that is being used today

Notes:

• A web browser is a software application for accessing information on the World Wide Web
• URL is an acronym for Uniform Resource Locator, It is a reference to the resource on the internet
• A client is a computer that connects to and uses the resources of a remote computer, or server
• The server handles the request from the web browser and sends back a response to build a connection to provide web services
• Cookies are messages that web servers pass to the web browser when user visit Internet sites

An illness that begins when large amounts of nitrates in water are ingested by an infant and converted to nitrite by the digestive system. The nitrite then reacts with oxy-haemoglobin (the oxygen-carrying blood protein) to form metheglobin, which cannot carry oxygen. If a large enough amount of metheglobin is formed in the blood, body tissues may be deprived of oxygen, causing the infant to develop a blue coloration of their mucous membranes and possibly digestive and respiratory problems. This condition is also known as methemoglobinemia. 

The Battle of Buxarwas fought on 22-23 October 1764 between the forces under the command of the British East India Company led by Hector Munro and the combined armies of Mir Qasim, Nawab of Bengal till 1763; the Nawab of Awadh; and the Mughal Emperor Shah Alam.

• The combined armies of Mughals, Awadh and MirQasim were defeated by the British army.
• Treaty of Allahabad was signed after the battle of Buxar.

• Chlorofluorocarbons (CFC) are used in Refrigerator, Air conditioner and Aerosol spray.
• Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine.

• Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air.
• These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.
• Sulfur dioxide and nitrogen oxides dissolve very easily in water and can be carried very far by the wind.
• As a result, the two compounds can travel long distances where they become part of the rain, sleet, snow, and fog that we experience on certain days.

Energy resources can be classified into two categories:

1. Renewable source (Non-conventional energy)
2. Non-Renewable source (Conventional energy)

Renewable energy resources are natural resources which can be regenerated continuously and are inexhaustible. They can be used again and again in an endless manner. Examples are Wood, Solar energy, wind energy, hydropower, tidal energy, geothermal energy, Biomass Energy etc.

• Biomass Energy: Energy produced by organic matter like plants and animals are called Biomass Energy
• Examples of biomass are wood, crop residues, seeds, cattle dung, sewage, agricultural wastes etc
• Biogas and biofuel are examples of biomass energy

Non-Renewable energy resources are natural resources which cannot be regenerated once they are exhausted. They cannot be used again. Examples are Oil, Coal, petroleum, natural gas, nuclear fuels etc.

• Stratosphere layer of atmosphere has the maximum concentration of Ozone gas.
• Approximately 10 per cent of Ozone layer is present in Troposphere and rest of the 90 per cent found in Stratosphere layer of atmosphere..
• Ozone layer in Stratosphere atmosphere absorbs most of the ultraviolet radiation from the Sun.
• Stratosphere is the second layer of atmosphere whereas Troposphere is the lowest layer of the atmosphere.
• The Thermosphere is the layer of the Earth's atmosphere is above the Mesosphere.
• There are five layers of atmosphere namely- Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.