Daily UPSC Prelims Current Affairs – March 10, 2023 [Mock Test]
March 25, 2023 March 25, 2023
1. Which of the following is/are the 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 in to roll-up displays.
Choose 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:- Organic Light Emitting Devices (OLED) emit light from active luminescent material in each display pixel. OLED panels are made from organic materials that emit light when electricity is applied through them. Since OLEDs do not require a backlight and filters (like LCD displays do), they are more efficient, simpler to make, and much thinner – and in fact can be made flexible and even rollable.
- OLEDs are ultrathin and light, they can be fabricated on flexible plastic or roll-up displays. Transparent displays are also possible. In general, OLEDs are more efficient than LCDs for displaying dark images because black pixels consume little power for an emissive display, while LCDs are more efficient than OLEDs at displaying bright images.
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 2
[B] Only 1 & 2
[C] Only 2 & 3
[D] 1, 2 & 3
Show Answer
Correct Answer: A [Only 2]
Notes:- A photonic crystal is an optical nanostructure in which the refractive index changes periodically (e.g., opal, butterfly wings, peacock feathers). Photonic crystals are attractive optical materials for controlling and manipulating light flow. One-dimensional photonic crystals are already in widespread use, in the form of thin-film optics, with applications from low and high-reflection coatings on lenses and mirrors to colour-changing paints and inks.
- Light is made of particles called photons, bundles of the electromagnetic field that carry a specific amount of energy.
- Graphene is an allotrope of carbon consisting of a single layer of atoms arranged in a two-dimensional honeycomb lattice nanostructure. It is used for its high strength, low weight and high conducting capability.
- In optics, the refractive index of an optical medium is a dimensionless number that gives an indication of the light-bending ability of that medium.
3. Consider the following statements:
- Core and headline inflation is a measure of the total inflation within an economy, including commodities such as food and energy prices.
- Retail Inflation is measured in India using Consumer Price Index- Combined (CPI-C).
Which of the statements given above is/are correct?
[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: B [Only 2]
Notes:- Headline inflation is a measure of the total inflation within an economy, including commodities such as food and energy prices (e.g., oil and gas), which tend to be much more volatile and prone to inflationary spikes (short-term impact of Inflation on the Economy).
- Retail Inflation is measured in India using Consumer Price Index- Combined (CPI-C).
- Core inflation is the change in the costs of goods and services, but it does not include those from the food and energy sectors. This measure of inflation excludes these items because their prices are much more volatile.
