The decimal equivalent of binary number 1101 is MCQ with Answer and Explanation

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The decimal equivalent of binary number 1101 is

A. 9

B. 11

C. 15

D. 13

Answer: Option D

Solution (By JKExamLibrary)

1×8 + 1×4 + 0×2 + 1×1 = 13.

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Question #1

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The colour with maximum wavelength in visible spectrum is

A. Green

B. Red

C. Blue

D. Violet

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Correct Answer: Option B

Explanation:
Red ~700 nm.

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Question #2

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The unit of magnetic flux is

A. Tesla

B. Henry

C. Farad

D. Weber

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Correct Answer: Option D

Explanation:
Weber (Wb) = T m².

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Question #3

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A body of mass m is taken from Earth's surface to a height equal to twice Earth's radius. Change in potential energy is

A. mgR/3

B. 2mgR/3

C. 3mgR

D. mgR

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Correct Answer: Option B

Explanation:
ΔU = GMm (1/R - 1/(R+2R)) = GMm (1/R - 1/3R) = (2/3)GMm/R = (2/3)mgR.

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