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MCQ

Q.

The mirror used by the dentists to see the teeth of the patients is

A

Convex

B

Concave

C

Plane

D

None of the above

Correct Answer: B

The correct answer is Concave.

Key Points

Concave Mirror:-
- If a hollow sphere is cut into parts and the outer surface of the cut part is painted, then it becomes a mirror with its inner surface as the reflecting surface.
- This type of mirror is known as a concave mirror.
- A concave mirror has a reflective surface that is curved inward and away from the light source.
- Concave mirrors reflect light inward to one focal point.
- Unlike convex mirrors, the image formed by a concave mirror shows different image types depending on the distance between the object and the mirror.
- Torch lights, automobile headlights are examples of concave mirrors.
- The mirror used by the dentists to see the teeth of the patients is also a Concave Mirror.
- Uses of Concave Mirror:
- Used in shaving mirrors, ophthalmoscope, astronomical telescopes, headlights, solar furnaces.

Additional Information

Convex Mirror:-
- If the cut part of the hollow sphere is painted from inside, then its outer surface becomes the reflecting surface.
- This kind of mirror is known as a convex mirror.
- A convex mirror is also known as a diverging mirror as this mirror diverges light when they strike its reflecting surface.
- Virtual, erect, and diminished images are always formed with convex mirrors, irrespective of the distance between the object and the mirror.
- A convex mirror is a diverging mirror in which the reflective surface bulges towards the light source.
- They are not used to focus light as they reflect light outwards.
- The image formed by convex mirrors is smaller than the object but gets larger as they approach the mirror.
- Magnifying glasses, telescopes are examples of convex mirrors.
- Uses of Convex Mirror: Inside buildings, Vehicle mirrors, Magnifying glass, Security purposes.
Plane Mirror:-
- A plane mirror is a flat, smooth reflective surface.
- A plane mirror always forms a virtual image that is upright, and of the same shape and size as the object, it is reflecting.
- A spherical mirror is a mirror that has a consistent curve and a constant radius of curvature.
- The images formed by a spherical mirror can either be real or virtual.
- Spherical mirrors are of two types:
  - Concave Mirror
  - Convex Mirror
- Uses of Plane Mirror: Solar cookers, looking glass, scientific instruments, constructing periscope which is used in submarines, kaleidoscope, a toy which produces beautiful patterns, SLR camera to click photos.

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Similar Questions

MCQ

1.

Click on the _______ for Cover Page button available in the Pages group command of MS Word.

A

Page layout tab

B

Mailing Tab

C

Home tab

D

Insert tab

Correct Answer: D

The correct answer is the Insert Tab.

Key Points

Cover Button can be used to insert a pre-formatted cover page for a document.
The information that is to appear on the page is filled in after the page is created.
It is used to fill in the title, author, date, and other information.
It is present in the Insert tab of MS word.

Important Points

Other important tools of Insert Tab

Tools/Button	Description
Blank Page	To insert a new blank page for a document at the cursor position, click this button.
Page Break	Click this button to end a page at the current cursor position and start a new page.
Tables	This button is used to insert a table into the document. A grid will appear that can be used to create the table. Additional options for creating a table are also available, such as drawing a table or using the Quick Tables feature.
Picture	To insert a picture from a file on the computer into the document, Click this button. The Insert Picture dialog box will appear. This dialog box is used to select the picture that is to be inserted into the document
Shapes	This button is used to insert ready-made shapes such as circles, squares, arrows, and triangles into a document. When the button is clicked, a gallery of different shapes will appear. To insert a shape, click the desired shape and then draw the shape in the document.
Smart Art	To insert a Smart Art graphic into the document, click this button. Smart Art graphics are objects such as Venn diagrams and organizational charts. When the button is clicked, a gallery of different categories and shapes will be displayed.
Hyperlink	To insert a link to items such as a Web page, another document, or an e-mail address, click this button. It is also possible to link to different areas of a document using headings and bookmarks. When the button is clicked, the Hyperlink dialog box will display. This is where the link can be specified.

Discussion

MCQ

2.

Arrange the memory in ascending order of its storage capacity.

A

Hard disk, Cache, Ram, Register

B

Register, Cache, RAM, Hard disk

C

Hard disk, RAM, Cache, Register

D

Register, RAM, Cache, Hard disk

Discussion

MCQ

3.

In which district 'Navlakha' lake is located?

A

Bundi

B

Jhalawar

C

Sawai Madhopur

D

Tonk

Discussion

MCQ

4.

Identify the diagram that best represents the relationship among the given classes.

Sun, Moon, Universe

A

B

C

D

Discussion

MCQ

5.

Spreadsheets, photo editing, PowerPoint, word documents, etc, are example of:

A

Application software

B

System software

C

Platform software

D

OS software

Correct Answer: A

The correct answer is Application software.

Key Points

Spreadsheets, photo editing, PowerPoint, word documents, etc, are examples of Application software.
- Application software, or app for short, is software that performs specific tasks for an end-user.
- Effectively, if the user is interacting directly with a piece of software it is application software.
  - For example, Microsoft Word or Excel is application software, as are common web browsers such as Firefox or Google Chrome.
- It also includes the category of mobile apps, including communication apps such as WhatsApp or games such as Candy Crush Saga.

Additional Information

System Software
- System software is a type of computer program that is designed to run a computer's hardware and application programs.
- If we think of the computer system as a layered model, the system software is the interface between the hardware and user applications.
- The operating system is the best-known example of system software.
- The OS manages all the other programs on a computer.
- System software is used to manage the computer itself.
  - It runs in the background, maintaining the computer's basic functions so users can run higher-level application software to perform certain tasks.
  - Essentially, system software provides a platform for application software to be run on top of.
System software generally includes the following features:
- High speed
  - System software must be as efficient as possible to provide an effective platform for higher-level software in the computer system.
- Hard to manipulate
  - It often requires the use of a programming language, which is more difficult to use than a more intuitive user interface (UI).
- Written in a low-level computer language
  - System software must be written in a computer language the central processing unit (CPU) and other computer hardware can read.
- Close to the system
  - It connects directly to the hardware that enables the computer to run.
- Versatile
  - System software must communicate with both the specialized hardware it runs on and the higher-level application software that is usually hardware-agnostic and often has no direct connection to the hardware it runs on.
The platform is hardware and software architecture that acts as a foundation or base upon which other applications, processes, or technologies are developed.
- In computing, platform refers to basic hardware i.e., computer system, and software i.e., the operating system on which software applications are often run.

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