CSS ID Selector MCQ Unique Element Practice Questions

Direction: Choose the correct option

How is an ID selector written in CSS?

A. .idname

B. *idname

C. idname

D. #idname

Direction: Choose the correct option

What is a key characteristic of ID selectors?

A. IDs are deprecated

B. Each ID should be unique on a page

C. IDs can be reused

D. IDs are for classes only

Direction: Choose the correct option

#header {
    background: black;
    color: white;
}

How many elements can this selector affect on a valid HTML page?

A. Only one element

B. Multiple elements

C. All header elements

D. No elements

Direction: Choose the correct option

What is the specificity weight of an ID selector compared to a class selector?

A. Higher than class

B. Lower than class

C. No specificity

D. Equal to class

Direction: Choose the correct option

Content

Which CSS correctly selects this element?

A. #sidebar { }

B. sidebar { }

C. .sidebar { }

D. div# { }

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