Question Discussion & Solution

A keyboard is for putting information including letters, words, and numbers into the computer. A keyboard's primary function is to act as an input device. Using a keyboard, a person can type a document, use keystroke shortcuts, access menus, play games and perform a variety of other tasks.

Key Points

• A modifier key is a key on a computer's keyboard that's only used in conjunction with another key.
• Modifier keys are often used with other keys to perform computer keyboard shortcuts and other commands.
• For example, in many text editor programs pressing the Ctrl+A selects all text.

Additional Information

• The function keys or F keys are lined across the top of the keyboard and labeled F1 through F12. These keys act as shortcuts, performing certain functions, like saving files, printing data, or refreshing a page.
  • For example, the F1 key is often used as the default help key in many programs. The F5 key is used in an Internet browser to refresh or reload a web page. The function of these keys can differ by the operating system and by a software program.
• A special key or media key, or multimedia key is a keyboard key that performs a special function not included with the traditional 104-key keyboard.
  • For example, the picture shows a Logitech keyboard.
• An ergonomic keyboard is a keyboard designed for comfort, ease of use, and reduced strain on the user.
  • Such keyboards may include features like concave or tapered keys, keys that are well-spaced, or keys that separate and angle out from a central pivot point.

Therefore, based on the above information The keys of a keyboard, which are used to modify the input of other keys, are called modifier keys.

The correct answer is Baran.

Key Points

• Shergarh Sanctuary:
  • It is located in Baran district, near Shergarh town. 
  • It was declared as a protected area in 1983.
  • This sanctuary is home to tiger, leopard, wild boar, sloth bear, chital, python, and other animals.

Additional Information

• Other Wildlife sanctuaries in Rajasthan:

Explanation:

• One of the most important contributors to the early construction of the periodic table was Russian scientist Dmitri Ivanovich Mendeléev.
• Mendeleev Periodic Table was introduced in 1869, following the rejection of Newlands Octave Law.
• Elements were arranged in Mendeleev's periodic chart according to their fundamental property, atomic mass, and chemical characteristics.
• Only 63 elements were known at Mendeleev's time.
• Mendeleev discovered that the properties of elements are the periodic function of their atomic mass in a periodic pattern after analysing their qualities.
• He ordered the elements in the periodic table so that those with comparable properties were in the same vertical columns.
• He developed a periodic law based on this finding, which states:- “The periodic function of an element's atomic mass is its property.”
• Demerits -  
  1. He couldn't find hydrogen in the periodic chart.
  2. Moving from one element to the next caused an irregular increase in atomic mass. As a result, the amount of elements that have yet to be identified is unpredictable.
  3. Isotopes were not considered. Later on, isotopes of elements that defied Mendeleev's periodic law were discovered.​ 

Additional Information

Mendeleev left places for undiscovered elements. 

• scandium, gallium and germanium, discovered later, have properties similar to Eka–boron, Eka–aluminium and Eka–silicon, respectively. So undiscovered elements were named also by Mendeleevs. 
• It was not very strictly based on increasing order of atomic mass.  For example, cobalt (atomic mass 58.9) appeared before nickel (atomic mass 58.7) based on periodic properties. 
• Noble gases can easily get adjusted in Mendeleev periodic table even they were discovered after the periodic table. 

The correct answer is Vitamin A.

Key Points 

• Night blindness is the inability to see well at night or in poor lighting conditions. 
• Night blindness is also called nyctalopia.
• Night blindness is often caused by Vitamin A deficiency.
• Night blindness is also caused by nearsightedness or cataracts.
• Foods that provide Vitamin A are carrots, sweet potatoes, eggs, milk, milk products, etc. 

Additional Information 

The correct answer is cookie.

Key Points

• A cookie is a small text file (up to 4 KB) created by a website that is stored in the user's computer temporarily for only that session or permanently in storage.
  • Cookies provide a way for the website to recognize you and track your preferences.
  • Cookies are typically used to "maintain the state" of the browser session. For example, users can place items in a shopping cart, switch to another page or another site, and when they return, the site recognizes them and the current state of the cart.
  • Cookies consist of a series of URLs (addresses) for which they are valid. When the web browser or other HTTP application again sends a request to the webserver containing those URLs, it sends it along with the associated cookies.
  • For example, if your user ID and password are stored in a cookie, this saves you from typing the same information over and over again the next time you access that service.
  • Cookies allow the website to customize the pages and create a custom experience for each individual.

Additional Information

• Malware
  • Malware is malicious software intended to cause damage to a computer or network.
  • Types of malware include viruses, worms, spyware, and ransomware.
  • Malware can find its way onto computers when a user clicks a link or email attachment that installs malicious software.
• Bug
  • A bug computer definition is referred to as a failure or a flaw in the software program.
  • A Bug produces an incorrect or undesired result that deviates from the expected result or behaviour.
  • When you add two numbers using this app and if it shows you a wrong total, then we can say this app has a bug.
• Cache
  • The cache is the temporary memory officially termed "CPU cache memory".
  • "Cache" is also used to refer to any temporary collection of data, either in hardware or software.