MCQs Of Class 6: CSS Units
Multiple Choice Questions (MCQs)
1. Which of the following is a relative unit of measurement in CSS?
a) px
b) em
c) pt
d) cm
Answer: b) em
Explanation: em is a relative unit based on the font size of the element's parent.
2. What does the rem unit stand for?
a) Relative element margin
b) Root em
c) Root element margin
d) Relative element font-size
Answer: b) Root em
Explanation: rem is based on the root element’s font size.
3. Which unit is ideal for responsive typography based on viewport width?
a) px
b) em
c) vw
d) rem
Answer: c) vw
Explanation: vw (viewport width) is ideal for creating responsive typography.
4. What unit is commonly used for setting widths in fluid layouts?
a) px
b) rem
c) %
d) em
Answer: c) %
Explanation: Percentages are used to create fluid layouts where widths depend on the parent container.
5. What is the default font size in most browsers?
a) 12px
b) 16px
c) 14px
d) 18px
Answer: b) 16px
Explanation: Most browsers default to a 16px font size for the body element.
6. Which of the following units is most appropriate for fixed layout elements?
a) %
b) vw
c) em
d) px
Answer: d) px
Explanation: px is used for fixed sizes and does not scale with other elements or the viewport.
7. In the CSS font-size: 2em;, what is 2em relative to?
a) The browser default font size
b) The parent element's font size
c) The root element's font size
d) The page’s content font size
Answer: b) The parent element's font size
Explanation: em is relative to the parent element’s font size.
8. Which of the following is true for viewport width (vw) units?
a) 1vw is equal to 1% of the viewport width.
b) 1vw is equal to 1% of the element width.
c) 1vw is equal to the width of the root element.
d) 1vw is equal to 1% of the element’s height.
Answer: a) 1vw is equal to 1% of the viewport width.
Explanation: vw is relative to the width of the viewport, with 1vw being 1% of the viewport's width.
9. Which CSS unit is best for adjusting font size relative to the root element’s font size?
a) px
b) em
c) rem
d) %
Answer: c) rem
Explanation: rem is relative to the font size of the root element (html).
10. What does the vh unit measure in CSS?
a) Viewport height
b) Viewport width
c) Vertical height
d) Horizontal height
Answer: a) Viewport height
Explanation: vh units are relative to the viewport height, with 1vh being 1% of the viewport's height.
[Continue with further MCQs as needed]
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Here are the next 40 multiple-choice questions (MCQs) related to CSS units and measurements:
11. Which of the following CSS units is best for defining flexible widths in a container?
a) px
b) em
c) %
d) rem
Answer: c) %
Explanation: % is ideal for defining flexible widths in a container, as it is relative to the parent element's size.
12. Which of the following CSS units is relative to the font size of the root element (<html>)?
a) px
b) rem
c) em
d) vh
Answer: b) rem
Explanation: rem is relative to the root element's font size.
13. What unit should be used for setting a fixed size element that remains consistent across devices and screen sizes?
a) em
b) rem
c) px
d) %
Answer: c) px
Explanation: px is used for fixed sizes that do not change with the screen size or parent element.
14. Which unit is best for responsive typography where font size adjusts based on viewport size?
a) px
b) em
c) rem
d) vw
Answer: d) vw
Explanation: vw (viewport width) is great for responsive typography.
15. What does 1rem represent in CSS?
a) 1% of the viewport width
b) 1% of the font size of the body element
c) 1% of the parent element's font size
d) The font size of the root element (<html>)
Answer: d) The font size of the root element (<html>)
Explanation: rem is always relative to the root element's font size, typically 16px by default.
16. Which of the following CSS units is relative to the element's font size?
a) rem
b) em
c) vw
d) px
Answer: b) em
Explanation: em is relative to the font size of the element itself or its parent.
17. What unit should be used for making font sizes scalable based on the user's device?
a) px
b) em
c) vw
d) pt
Answer: c) vw
Explanation: vw (viewport width) is perfect for scaling font sizes based on the device's screen width.
18. In a calc() function, which CSS units can be combined?
a) px, em
b) em, rem
c) px, %
d) All of the above
Answer: d) All of the above
Explanation: The calc() function allows combining multiple units like px, em, %, and others.
19. What is the unit vh used to measure in CSS?
a) Viewport width
b) Viewport height
c) Horizontal element height
d) Vertical screen width
Answer: b) Viewport height
Explanation: vh is a unit relative to the height of the viewport.
20. Which of the following is used to create fluid layouts based on the width of the parent container?
a) em
b) rem
c) %
d) px
Answer: c) %
Explanation: % units allow for fluid layouts based on the parent element’s size.
21. In the CSS rule font-size: 2em;, what does 2em mean?
a) Twice the default font size
b) Twice the font size of the parent element
c) Twice the viewport width
d) Twice the root font size
Answer: b) Twice the font size of the parent element
Explanation: em is relative to the font size of the parent element.
22. Which unit would you use to set a font size based on the width of the viewport?
a) px
b) em
c) vw
d) rem
Answer: c) vw
Explanation: vw is based on the width of the viewport, allowing for responsive font sizes.
23. Which of the following units is typically used for specifying page margins and paddings?
a) px
b) em
c) rem
d) vh
Answer: a) px
Explanation: px is most commonly used for fixed pixel measurements in layout spacing.
24. What is the benefit of using rem units in typography?
a) It scales relative to the browser’s default font size
b) It is responsive to the container’s size
c) It always refers to the viewport size
d) It is fixed and does not change with the screen size
Answer: a) It scales relative to the browser’s default font size
Explanation: rem scales based on the root element’s font size, making it ideal for responsive design.
25. Which of the following units would you use for a fluid layout where the width adapts to the viewport?
a) px
b) em
c) %
d) rem
Answer: c) %
Explanation: % units are relative to the parent element, making them ideal for fluid layouts.
26. Which unit would be best for specifying the width of an element in relation to the screen size?
a) em
b) rem
c) vw
d) px
Answer: c) vw
Explanation: vw is ideal for specifying widths based on the viewport size.
27. What is the CSS unit pt commonly used for?
a) Printing
b) Web-based designs
c) Viewport-relative measurements
d) Flexbox layouts
Answer: a) Printing
Explanation: pt (point) is traditionally used for print media, where 1 point equals 1/72 inch.
28. Which of the following units is best for defining layout properties that need to scale with the font size of the parent element?
a) px
b) em
c) rem
d) %
Answer: b) em
Explanation: em scales relative to the font size of the parent element, making it ideal for scaling layout properties like padding or margins.
29. Which of the following units are relative to the width of the viewport?
a) vh and vw
b) px and em
c) pt and cm
d) rem and em
Answer: a) vh and vw
Explanation: vh and vw are relative to the viewport height and width, respectively.
30. Which CSS unit is useful when creating a flexible layout where elements maintain a proportion relative to the screen size?
a) px
b) em
c) %
d) rem
Answer: c) %
Explanation: % allows elements to scale relative to their parent container, making it useful for flexible layouts.
31. What is the most appropriate unit for setting font sizes based on the user's screen or device?
a) px
b) em
c) rem
d) vw
Answer: d) vw
Explanation: vw units scale with the viewport width, making them ideal for responsive font sizes.
32. Which of the following units is ideal for setting widths and heights based on the viewport size?
a) vh
b) px
c) em
d) rem
Answer: a) vh
Explanation: vh is ideal for setting widths and heights based on the viewport height.
33. How can you define a layout that adapts to both width and height of the viewport?
a) By using both vw and vh
b) By using em for padding
c) By using rem for font size
d) By using px for exact measurements
Answer: a) By using both vw and vh
Explanation: Combining vw and vh allows the layout to adapt to both the width and height of the viewport.
34. Which of the following units would you use for a fixed-width element that remains the same size on all devices?
a) em
b) rem
c) px
d) %
Answer: c) px
Explanation: px is used for fixed-width elements that do not change with the screen size.
35. What unit would be most appropriate for responsive padding inside an element?
a) em
b) px
c) rem
d) %
Answer: a) em
Explanation: em is relative to the font size of the element, making it ideal for responsive padding.
36. What is the unit of measurement that is always 1% of the viewport’s width?
a) vw
b) vh
c) %
d) rem
Answer: a) vw
Explanation: vw stands for viewport width, where 1vw is always 1% of the viewport width.
37. Which of the following units is best for defining layout properties in a mobile-first design?
a) px
b) em
c) rem
d) %
Answer: d) %
Explanation: % units help create responsive designs that adapt to different screen sizes, which is essential for mobile-first designs.
38. Which unit is used to specify sizes relative to the root element’s font size?
a) px
b) rem
c) em
d) vh
Answer: b) rem
Explanation: rem is relative to the root element's font size and is useful for maintaining consistent scaling.
39. For which of the following would rem be the best unit to use?
a) Border widths
b) Text sizes
c) Padding sizes
d) Container widths
Answer: b) Text sizes
Explanation: rem is best used for text sizes to ensure they scale based on the root element's font size.
40. Which of the following is used to define a flexible layout where elements adjust according to their container?
a) px
b) em
c) %
d) rem
Answer: c) %
Explanation: % units are flexible and adjust according to the container size.
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ChatGPT said:
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Here are the next 10 multiple-choice questions (MCQs) related to CSS units and measurements:
41. Which of the following CSS units is used to define font sizes relative to the root element's font size?
a) em
b) rem
c) px
d) vh
Answer: b) rem
Explanation: rem (root em) is relative to the font size of the root element (<html>).
42. Which unit is ideal for responsive web design when you want an element’s width to scale according to the width of the viewport?
a) px
b) em
c) rem
d) vw
Answer: d) vw
Explanation: vw (viewport width) is ideal for responsive design as it scales relative to the width of the viewport.
43. What does 1em represent in terms of CSS measurements?
a) 1% of the viewport height
b) The font size of the parent element
c) 1% of the container's width
d) The root font size
Answer: b) The font size of the parent element
Explanation: em is relative to the font size of the element’s parent, meaning it adjusts according to the inherited font size.
44. Which of the following units is based on the width of the viewport?
a) vh
b) em
c) rem
d) vw
Answer: d) vw
Explanation: vw (viewport width) is based on the width of the viewport, where 1vw is 1% of the viewport width.
45. Which CSS unit is most commonly used for defining margins and paddings in a responsive layout?
a) px
b) em
c) rem
d) %
Answer: b) em
Explanation: em is ideal for defining margins and paddings because it scales relative to the font size of the element, making it more flexible and responsive.
46. In CSS, if you want an element's size to be directly affected by the height of the viewport, which unit would you use?
a) px
b) em
c) vh
d) rem
Answer: c) vh
Explanation: vh (viewport height) is used for measurements based on the height of the viewport. 1vh is 1% of the viewport height.
47. Which of the following is NOT a relative unit in CSS?
a) em
b) rem
c) %
d) px
Answer: d) px
Explanation: px (pixel) is an absolute unit, meaning it does not scale relative to other elements or screen size.
48. Which CSS unit is recommended for scalable layouts that adapt to various screen sizes?
a) px
b) em
c) rem
d) %
Answer: d) %
Explanation: % units allow elements to adapt and scale relative to their parent container, making them ideal for scalable layouts.
49. What does vw represent in CSS?
a) Viewport width
b) Vertical width
c) View width
d) Variable width
Answer: a) Viewport width
Explanation: vw stands for viewport width, and 1vw is equal to 1% of the viewport width.
50. If a font size is set to 2rem, and the root font size is 16px, what will the font size be?
a) 16px
b) 32px
c) 2px
d) 8px
Answer: b) 32px
Explanation: Since 1rem is equal to the root font size, 2rem would be 2 * 16px = 32px.
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