What is the decimal equivalent of binary 10101? MCQ with Answer and Explanation

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What is the decimal equivalent of binary 10101?

A. 23

B. 22

C. 21

D. 24

Answer: Option C

Solution (By JKSSB Mock Tests)

10101 = 16+4+1 = 21.

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Question #1

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Which electronic component served as the core physical switcher and amplifier inside second-generation computers, rendering vacuum tubes obsolete?

A. Transistors

B. Integrated Circuits

C. Magnetic Drums

D. Silicon Microchips

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Correct Answer: Option A

Explanation:
Transistors replaced vacuum tubes in the second generation, making computers smaller, faster, cooler, and far more energy efficient.

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Question #2

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What physical media served as the primary external backup and secondary storage format during the second generation of computers?

A. Optical CD-ROMs

B. Magnetic Tapes and Disks

C. Punched Paper Cards

D. Solid State Flash Drives

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Correct Answer: Option B

Explanation:
Second-generation computer systems saw a transition from paper-based punched cards to faster, re-recordable magnetic tapes and early disks.

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Question #3

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Which of the following is an example of an output device for hard copy?

A. Speaker

B. Printer

C. Projector

D. Monitor

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Correct Answer: Option B

Explanation:
A printer produces hard copy (physical) output.

This question belongs to: Computer Computer Fundamentals

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