Question Discussion & Solution

• For most computer languages, the name of the file that holds the source code to a program is immaterial
• However, in Java the name given to a source file is very important
• The Java compiler requires that a source file uses the .java filename extension
• Only file.java follow the properties in the given options
• In Java, a source file is officially called a compilation unit; It is a text file that contains one or more class definitions

The correct answer is Alt+F4.

Key Points

• Alt+F4 is a shortcut key that is used to close the currently active window.
• To stop the current window this shortcut has been used.
• For example: if we pressed the shortcut key now while reading this page on your computer browser, it would close the browser window and all open tabs.

How to Use this Shortcut Key

• To use the keyboard shortcut Alt+F4, press Alt andF4 Key simultaneously.

• While running any program in Microsoft Windows, if Alt+F4 is pressed, it closes the currently active program.
• If no programs are open or we are at the desktop, pressing Alt+F4 opens the Shutdown window.

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Additional Information

Functions of other shortcut Keys in computer

• Alt + Tab
  • Alt+Tab  can be used to switch to any running program that has an application-level window.
  •  It can be used to alternate between the two most recent tasks.
  •  It acts as an alternate between a full-size window and the desktop.
• Alt+E
  • ​It is a shortcut key most often used to open the Edit file menu option for programs supporting a file menu.
  • In Google Sheets, pressing Alt+E opens the Edit file menu option.
  • In Chrome, pressing Alt+E opens the Chrome menu.
  • In Microsoft Internet Explorer and Mozilla Firefox, pressing Alt+E opens the Edit file menu.
• F1
  • Used as the help key in almost every program, it opens a help screen when this key is pressed.
  • Windows Key + F1 opens the Microsoft Windows help and support center.
  • It opens the Task Pane.
• Cntrl+1
  • Ctrl+1 is a shortcut key most often used to switch to the first tab in a browser or other programs with tab support.
  • The "1" (one) used with this shortcut is the "1" at the top of the keyboard, not on the numeric keypad.
  • It is also known as  Control 1 and C-1.

Concept-

• Roots are the underground structures that help in the absorption of water and minerals, provide a proper anchorage to the plant parts, storage of reserve food material (Carrot, Radish), and synthesis of PGR (plant growth regulators).
• Sometimes roots get modified to perform different functions like Storage of food, respiration, climbing, etc.
• These types of roots are called modified roots.

Explanation-

• The Coralloid roots are the specialized roots found in cycas, these roots exhibit a symbiotic relationship between the cyanobacteria and cycas where the cyanobacteria fix the nitrogen and in return, the cycas provide a stable environment to live.
• Cycas, a genus of 105 species of palmlike tropical and subtropical ornamental cycads (family Cycadaceae), among them trees 12 meters (40 feet) or more in height. 
• Their leaves are dark green and circinate (uncoiling as fern leaves do), differing from those of other members of the family in having a midrib but no lateral veins. 
• The seeds are borne along the margins of modified leaves, which are arranged in a whorl at the top of the trunk, rather than in compact cones. 

Thereby coralloid roots are found in cycas.

Additional Information

• Lycopodiopsida
  • It is a class of herbaceous vascular plants known as lycopods, lycophytes.
  • Members of the class are called clubmosses, firmosses, and quillworts.
• Pine
  • A pine is any conifer in the genus Pinus of the family Pinaceae. Pinus is the sole genus in the subfamily Pinoideae.
• Dryopteris
  • It is commonly called the wood ferns, male ferns, or buckler ferns is a fern genus in the family Dryopteridaceae.​

The correct answer is 14 years.

• Under Section-3 of the "Children and Adolescent Labor (Prohibition and Regulation) Act", it a cognizable offence for a child of 14 years to work in any type of hazardous area or non-risk area.

Key Points

• Child and Adolescent Labour (Prohibition and Regulation) Act, 1986
  • As per the Child and Adolescent Labour (Prohibition and Regulation) Act, 1986, a "Child" is defined as any person below the age of 14, and the CLPR Act prohibits employment of a Child in any employment including as domestic help.
  • The act was amended in 2016 ("CLPR Act").

​Additional Information

• Importance of the act
  • In 2011, the national census of India found the total number of child labourers, aged [5–14], to be at 10.1 million, out of the total of 259.64 million children in that age group.
  • The child labour problem is not unique to India; worldwide, about 217 million children work, many full-time.

49 ÷ 7 = 7,

70 ÷ 7 = 10,

91 ÷ 7 = 13,

99 ÷ 7 = 14.14

So, 49, 70 and 91 are the multiples of 7 while 99 is not a multiple of 7.