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Question

Match the following with the correct answer:

(1)

Work

(A)

Chemical energy converts into electrical energy

(2)

Battery

(B)

Sound energy converts into electrical energy

(3)

Power

(C)

Kilowatt-hour

(4)

Microphone

(D)

Joule

This question was previously asked in
RRB ALP 2018 CBT 2 Fitter Question Paper (21-Jan-2019) (Shift 3)
The correct answer is 1 - D, 2 - A, 3 - C, 4 - B

This question requires matching physics concepts and units with their correct definitions or associations. We need to pair each item from the first list (Work, Battery, Power, Microphone) with the correct item from the second list (Chemical energy converts into electrical energy, Sound energy converts into electrical energy, Kilowatt-hour, Joule).

Understanding the Concepts and Units

Let's analyze each item to establish the correct matches:

  • Work: In physics, work is done when a force causes a displacement. The standard unit for measuring work and energy is the Joule (J). Therefore, Work is correctly matched with Joule (D). The LaTeX notation for Joule is $J$.
  • Battery: A battery is a device that stores and converts chemical energy into electrical energy. This electrical energy can then be used to power devices. So, Battery matches with Chemical energy converts into electrical energy (A).
  • Power: Power is defined as the rate at which energy is transferred or converted, or the rate at which work is done. Its SI unit is the Watt (W), which is equivalent to one Joule per second ($J \cdot s^{-1}$). The option Kilowatt-hour (C) is a unit of energy, not power. A kilowatt-hour ($kWh$) represents the energy consumed or produced by one kilowatt of power in one hour. While technically mismatched as a direct definition or unit of power, in practical contexts, energy consumption (often billed in kWh) is related to the power rating of appliances and their usage duration. Based on the provided options and the common correct answer alignment, this pairing is likely intended.
  • Microphone: A microphone is a transducer that converts acoustic energy, specifically sound energy, into an electrical signal. This process is fundamental to audio recording and amplification. Thus, Microphone correctly matches with Sound energy converts into electrical energy (B).

Detailed Matching of Concepts

Here's a breakdown of the matches:

  • Work corresponds to Joule (D).
  • Battery corresponds to Chemical energy converts into electrical energy (A).
  • Power corresponds to Kilowatt-hour (C). (Note: kWh is a unit of energy).
  • Microphone corresponds to Sound energy converts into electrical energy (B).

Matching Pairs Table

Item Description
(1) Work (D) Joule
(2) Battery (A) Chemical energy converts into electrical energy
(3) Power (C) Kilowatt-hour
(4) Microphone (B) Sound energy converts into electrical energy

Identifying the Correct Option

Based on the detailed analysis and the derived matches (1-D, 2-A, 3-C, 4-B), we look for the option that reflects this specific order.

Option 1 lists the matches as: 1 - D, 2 - A, 3 - C, 4 - B.

This option accurately represents the pairings derived from the question, including the association of Power with Kilowatt-hour.

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