Question Discussion & Solution

CONCEPT:

Force:

• The interaction which after applying on a body changes or try to changes the state of rest or state of motion is called force.
• It is denoted by F. The SI unit of force is Newton (N).

Force (F) = Mass (m) × acceleration (a)

• If more than one force is acting on a body, then the effect on the body is due to the net force.
• A stationary object on which no force is acting remains stationary.
• An object in motion continues to move with the same speed and direction when no force is acting on the object. This is Newton’s first law of motion. 

​CALCULATION:

Given:

Force = 20 N

Acceleration (a) = 2 m/s2

⇒ Force (F) = m a 

⇒ m = F/a = 20/2 = 10 kg.

So, option 4^th is correct.

The correct answer is Leeuwenhoek.

Key Points

Additional Information

• Penicillin:
  • Penicillin is one of the first and still one of the most widely used antibiotic agents, derived from the Penicillium mold.
  • In 1928 Scottish bacteriologist Alexander Fleming first observed that colonies of the bacterium Staphylococcus aureus failed to grow in those areas of a culture that had been accidentally contaminated by the green mold Penicillium notatum.
  • He isolated the mold, grew it in a fluid medium, and found that it produced a substance capable of killing many of the common bacteria that infect humans.
  • Australian pathologist Howard Florey and British biochemist Ernst Boris Chain isolated and purified penicillin in the late 1930s, and by 1941 an injectable form of the drug was available for therapeutic use.
• Microscope:
  • Microscope is an instrument that produces enlarged images of small objects, allowing the observer an exceedingly close view of minute structures at a scale convenient for examination and analysis.
  • Although optical microscopes are the subject of this article, an image may also be enlarged by many other waveforms, including acoustic, X-ray, or electron beam, and be received by direct or digital imaging or by a combination of these methods.
  • The microscope may provide a dynamic image (as with conventional optical instruments) or one that is static (as with conventional scanning electron microscopes).
• Reverse transcriptase:
  • Reverse transcriptase also called RNA-directed DNA polymerase, an enzyme encoded from the genetic material of retroviruses that catalyzes the transcription of retrovirus RNA (ribonucleic acid) into DNA (deoxyribonucleic acid).
  • This catalyzed transcription is the reverse process of normal cellular transcription of DNA into RNA, hence the names reverse transcriptase and retrovirus.
  • Reverse transcriptase is central to the infectious nature of retroviruses, several of which cause disease in humans, including human immunodeficiency virus (HIV), which causes acquired immunodeficiency syndrome (AIDS), and human T-cell lymphotropic virus I (HTLV-I), which causes leukemia.
• Bacteria:
  • Bacteria, singular bacterium, any of a group of microscopic single-celled organisms that live in enormous numbers in almost every environment on Earth, from deep-sea vents to deep below Earth’s surface to the digestive tracts of humans.
  • Bacteria lack a membrane-bound nucleus and other internal structures and are therefore ranked among the unicellular life-forms called prokaryotes.
  • Prokaryotes are the dominant living creatures on Earth, having been present for perhaps three-quarters of Earth history and having adapted to almost all available ecological habitats.
  • As a group, they display exceedingly diverse metabolic capabilities and can use almost any organic compound, and some inorganic compounds, as a food source.

The pattern followed here is:

Similarly,

Hence, ODVKOGHMQ is the correct answer.

The correct answer is option 4.

Concept:

CPU Scheduling is a process of determining which process will own CPU for execution while another process is on hold. All Cpu scheduling algorithms use various parameters which are,

Arrival Time: Time at which the process arrives in the ready queue.

Schedule time: Time at which the process arrives ready to running state.

Completion Time: Time at which the process arrives running to terminate state.

Burst Time:  Time spends the process running state.

Turn Around Time:

Turn Around Time= Completion Time – Arrival Time.

Waiting Time:

Waiting time is the total time spent by the process in the ready state waiting for the CPU.

Response time:

Response time is the difference between first execution time and Arrival time.

CPU utilization:

CPU utilization refers to a computer's usage of processing resources or the amount of work handled by a CPU.

Throughput:

Throughput is the amount of work completed in a unit of time.

Throughput = no .of process completed / time taken.

Hence the correct answer is A, B, C, and D.

The correct answer is Outline.

Key Points

• Outline View
  • ​The Outline view shows the different levels of headings as designated by the styles applied in your document.
  • Headings are like titles in your document that explain the section of text to follow.
  • Each heading in the Outline view is indicated by symbols.
• Bold, Italic and Underline font style in MS Word
  • These commands are given in the Font group in the Home tab. 
    • Bold:
      • It allows you to Bold the text of your document
    • Italic:
      • It allows you to Italicize the text of your document
    • Underline:
      • It allows you to underline the text of your document.

Additional Information

• The basic steps to change the font of a text in a document are given below;
  • Select the text you want to modify
  • Select the Home tab and locate the Font group
  • Click the drop-down arrow next to the font style box
  • Font style menu appears
  • With a left-click select the desired font style
  • If you want to change the font to bold or italic, click the 'B' or 'I' icons on the format bar.
  •