Question Discussion & Solution

Concept:

Pure virtual function:

• A pure virtual function is a virtual function that is required to be implemented by a derived class if derived class is not abstract.
• Base class containing pure virtual function becomes abstract.

Syntax of pure virtual function:

Virtual func_type func_name () = 0;

So option 4 is the correct answer.

The correct answer is option 3 i.e Backup.

Key Points

• Protecting data by copying it from the original source to a different destination is called Backup.
  • Backups can be used to recover data after its loss from data deletion or corruption.

Additional Information​ 

• The activity of creating sectors and tracks on a hard disk is called Formatting.
• The process of unauthorised access to information system is called Hacking.
  • One who does hacking is called Hacker.
  • Hackers are mainly classified as White Hat Hackers, Black Hat Hackers, Gray Hat Hackers.
• Data diddling is the unauthorised changing of data before or during their input to a computer system.

The correct answer is CTRL + F2.

• Print Preview is a feature that displays on the screen what a hard copy would look like when printed.
  • Press Ctrl + F2 to open the print preview for the document.
  • By using the print preview, you can find any errors that may exist or fix the layout before printing, which can save ink or toner and paper by not having to print more than once.

Additional Information

• To open the print preview feature, click the print preview icon on the toolbar, like that shown in the picture, or click File and choose the Print Preview option.
• Some programs, like newer versions of Microsoft Office applications, show a print preview on the Print page.
• In these cases, there is no Print Preview option in the program's menu.
• Many programs do not have a shortcut key for the print preview feature.
• However, you can press Alt+F to open the file menu and press V, R, or the other underlined character (Mnemonic) for the Print Preview option.
• In programs like Microsoft Word, while in the print preview, you can change the page orientation from Portrait Orientation to Landscape.
• Orientation to view the page in landscape.
• Unfortunately, not all programs support this ability.
• If the program you're using has no settings or options in print preview, you cannot view how your page would print in landscape mode.

For alphabet: increase alphabet by + 2

B + 2 → D + 2 → F + 2 → H + 2 → J + 2 → L

For Number: multiply by × 2

2 × 2 = 4

4 × 2 = 8

8 × 2 = 16

16 × 2 = 32

32 × 2 = 64

The correct answer is Silicon.

• An integrated circuit, or IC, is a small chip that can function as an amplifier, oscillator, timer, microprocessor, or even computer memory.
• An IC is a small wafer, usually made of silicon, that can hold anywhere from hundreds to millions of transistors, resistors, and capacitors.
• An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material that is normally silicon.

Key Points

• Silicon is a highly pure, easy to use, and cheap semiconductor, perfect for the now huge computer chip industry.
• Silicon is used because it can be used as either an insulator (doesn't allow electricity to flow) or a semiconductor (allows a little flow of electricity).

Important Points

The advantages of ICs :

• Extremely small in size.
• Low power consumption.
• Reliability.
• Reduced cost.
• Very small weight.
• Easy replacement.