1. Which of the following is/are advantages of Organic Light Emitting Diodes (OLEDs) over Liquid Crystal Displays (LCDs)?
- OLEDs do not require a backlight and filters.
- OLEDs are more efficient and can be fabricated on flexible plastic substrates.
- OLEDs are more efficient at displaying bright images.
- OLEDs can be fabricated into roll-up displays.
Select the correct answer using the codes given below:
[A] Only 2
[B] Only 1 & 4
[C] Only 1, 2 & 4
[D] 1, 2, 3 & 4
Show Answer
Correct Answer: C [Only 1, 2 & 4]
Notes:
OLEDs emit light directly and do not require a backlight or filters, are efficient for dark images, can be fabricated on flexible or roll-up displays, and are thinner than LCDs. However, OLEDs are typically less efficient than LCDs at displaying bright images; LCDs use less power for such content. Thus, statements 1, 2, and 4 are correct.
2. Consider the following statements:
- A photonic crystal is an optical nanostructure in which the refractive index does not change.
- Refractive index gives an indication of the light-bending ability of that medium.
- Graphene is a three-dimensional honeycomb carbon lattice nanostructure.
Which of the statements given above is / are correct?
[A] Only 1 and 2
[B] Only 2
[C] Only 2 and 3
[D] 1, 2 and 3
Show Answer
Correct Answer: B [Only 2]
Notes:
Statement 2 is correct as refractive index indeed measures a medium's light-bending ability. Statement 1 is incorrect; in photonic crystals, the refractive index changes periodically. Statement 3 is also incorrect, as graphene has a two-dimensional, not three-dimensional, honeycomb lattice. Hence, only statement 2 is correct.
3. Consider the following statements:
- Core and headline inflation is a measure of the total inflation within an economy, including volatile commodities such as food and energy prices.
- Retail inflation is measured in India using Consumer Price Index-Combined (CPI-C).
Which of the above statements is / are correct?
[A] Only 2
[B] Only 1
[C] Both 1 and 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: A [Only 2]
Notes:
Headline inflation includes food and energy prices and represents total inflation in the economy, whereas core inflation excludes these volatile items. Statement 1 misrepresents core inflation. Retail inflation in India is indeed measured using the Consumer Price Index-Combined (CPI-C), making statement 2 correct and statement 1 incorrect.
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