Question Discussion & Solution

The correct answer is Methane.

Key Points

• Methane (CH4)
  • It is the simplest hydrocarbon consisting of one carbon atom and four hydrogen atoms and the simplest hydrocarbon, is the most abundant hydrocarbon pollutant.
  • It is a powerful greenhouse gas.
  • Major natural sources of methane include emissions from wetlands, and oceans and from the digestive processes of termites.
  • Methane is more than 25 times as potent as carbon dioxide at trapping heat in the atmosphere.

Additional Information

• Butane is a gaseous component (at room temperature and atmospheric pressure) of the Alkane group having the chemical formula is C4H10.
• It is a colourless, highly flammable, and easily liquefied gas.
• In the abundance of oxygen, it forms Carbon dioxide, but if limited oxygen is available, then it forms Carbon Monoxide.

2C4H10 + 13O2 → 8CO2 + 10H2O                   (oxygen in plenty)

2C4H10 + 9O2 → 8CO + 10H2O                      (oxygen is limited)

• Uses –
  • Gasoline blending
  • Fuel gas
  • Fragrance extraction solvent
  • Feedstock for the manufacture of ethylene and butadiene
  • Ingredient for synthetic rubber
  • Isobutane to enhance the Octane number of gasoline in refineries.
• A propane molecule has three carbon atoms and eight hydrogen bonds and has the formula C3H8. 
• Propane is a colourless, easily liquefied, gaseous hydrocarbon (compound of carbon and hydrogen) and the third member of the paraffin series following methane and ethane.
• Propane is produced as a by-product of two other processes, natural gas processing and petroleum refining.
• It is separated in large quantities from natural gas, light crude oil, and oil-refinery gases and is commercially available as liquefied propane or as a major constituent of liquefied petroleum gas (LPG).
• Uses: 
  • It is used in LPG, also used as biofuel in buses and taxis and it is also the main gas in blowtorches and for hot air balloons.
  • Propane gas has become a popular choice for barbecues and portable stoves because its low boiling point makes it vaporize as soon as it is released from its pressurized container.
• The chemical formula of Ethane is C2H6.
• It is a colourless, odourless gas at normal temperature and pressure.
• It is extracted from natural gas on an industrial scale and is a petrochemical by-product of petroleum refining.
• Michael Faraday first synthesized it in 1834, using the electrolysis of a solution of potassium acetate.

16 = 4²

100 = 10²

196 = 14²

216 = 6³

16, 100 and 196 are the perfect squares whereas 216 is a perfect cube.

Microsoft PowerPoint

• It is used to create overhead transparency, paper, 35mm slides, Photo Print, or on-screen presentations.
• We can insert pictures, sounds, animation, and type text in presentations.
• There are Auto Layouts and templates that make the creation of the presentation simple.
• PowerPoint offers a way to preview show, add special effects to the slides as displayed on-screen and rehearse the timings of each slide.

• After creating a presentation file, slides can be added, inserted, rearranged, or deleted wherever necessary.

Key Points

There are many views to view a PowerPoint Presentation

Slide Sorter view:

• Slide Sorter view gives you a miniature picture of each slide.
• You can use this view to select and drag slides from one position to another within the slide show.
• The slide number appears near the bottom-right corner of each slide.
• To select a slide in Slide Sorter view, use the arrow keys to highlight the slide, or click on the slide you want to select.  A bold outline surrounds the selected Slide.
• You can select the slide in the Slide Sorter View and press the ‘Delete’ key to delete a slide.

Hence, The slide sorter view in a presentation is used for sorting out the position and view of different slides which can be done when those are displayed as thumbnails and can be sorted by moving.

Additional Information

Slide Show View

• The Slide Show view displays the slide full screen. When you use this view, the PowerPoint window is not visible and each slide occupies the complete screen area. 
• This view helps you to check the final sizes, colors, animation, transitions between slides, sounds, and other controls.
• To display the Slide Show view, select the Slide Show option from the View Menu.

Slide master:

• A slide master is a top slide in a hierarchy of slides that stores information about the theme and slide layouts of a presentation, including the background, color, fonts, effects, placeholder sizes, and positioning.
• To create a master slide: On the View tab, click Slide Master.

Notes Page:

• The Notes Page view enables you to view your speaker notes in a page view.
• Each slide created contains its own Notes Page.
• You can print these pages out to use as a reference while delivering the presentation.
• These notes do not show on the screen during Slide Show.

The correct answer is Microphone.

• ​A microphone is an input device, which is used to save a person's voice on a computer.

Key Points

• Microphone
  • The microphone is a device connected to a computer (via an audio interface or another analog-to-digital converter).
  • It sends/inputs information into the computer.
  • This means microphones are input devices.

​Additional Information

• Speaker
  • Speakers are one of the most common output devices.
  • The purpose of speakers is to produce audio output that can be heard by the listener.
• Scanner
  • ​A scanner is an input device that scans documents such as photographs and pages of text.
  • When a document is scanned, it is converted into a digital format. 
• Joystick
  • ​A joystick is an input device.
  • It can be used for controlling the movement of the cursor or a pointer in a computer device.

The correct answer is CPU.

Key Points

• CPU (Central Processing Unit) -
  • It is the main part of the computer, it can also be called the 'brain of the computer'.
  • Its function is to process the inputs and instructions coming on the computer. 
  • This unit of computer performs arithmetic, logical, control functions, input functions, and output functions. 
  • It is also commonly known as a processor.

Additional Information

• Motherboard -
  • It is a printed circuit board installed in most electronic plants such as laptops, computers, etc.
  • It is also called the mainboard or system board.
  • The main part of the motherboard is its chipset.
• RAM (Random Access Memory) -
  • This is a type of memory, we also know it by the name of Primary Memory.
  • There are two types of RAM. Static RAM and Dynamic RAM