Which technology allows the transmission of data through light? MCQ with Answer and Explanation

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Which technology allows the transmission of data through light?

A. Wi-Fi

B. Li-Fi

C. Bluetooth

D. Zigbee

Answer: Option B

Solution (By JKSSB Mock Tests)

Li-Fi (Light Fidelity) uses light waves from LED bulbs to transmit data at high speeds.

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Question #1

What is the smallest unit of digital data?

A. Gigabyte

B. Bit

C. Byte

D. Kilobyte

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Correct Answer: Option B

Explanation:
A bit (binary digit) is the basic unit of information in computing.

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Question #2

The internet was developed from which project?

A. NASA

B. ARPANET

C. ISRO

D. CERN

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Correct Answer: Option B

Explanation:
ARPANET was the precursor to the modern internet.

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Question #3

What is the speed of sound in air at room temperature approximately?

A. 300,000,000 m/s

B. 450 m/s

C. 330 m/s

D. 1500 m/s

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Correct Answer: Option C

Explanation:
The speed of sound in air is approximately 330-343 meters per second at 20°C.

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