Daily Current Affairs (MCQ's) | 22-05-2023

Q1. Which of the following pairs are correctly matched?

Select the correct answer from codes given below

a. 1 and 2 only

b. 1 and 3 only

c. 3 only

d. 2 and 3 only

Answer (a)

Explanation:

Q2. Consider the following statements with respect to abiogenesis

1. This theory states that life started on earth 3.5 billion years ago from non-life components such as amino acids, nucleotide molecules or sugars.

2. Scientists believe this process kicked off most likely around hydrothermal vents deep in the ocean.

Which of the above statements is/are incorrect?

a. 1 only

b. 2 only

c. Both 1 and 2

d. Neither 1 nor 2

Answer (d)

Explanation:

Could an ocean cocktail have been the trigger for abiogenesis?

• The origin of life on Earth is often a topic of hot debate within the scientific community. One of the prominent theories of how life came to be is abiogenesis.

• This theory states that life started on earth 3.5 billion years ago from non-life components such as amino acids, nucleotide molecules or sugars.

• These are the building blocks of life. To prove this theory, the now- famous Miller-Urey experiment was conducted in 1952.

• Two scientists, Stanley Miller and Harold Urey, applied a substantial amount of electricity to a mix of hydrogen, ammonia, methane and water vapor, mimicking the conditions found on earth at the time.

• Proponents of abiogenesis hypothesize that these simple components came together to form complex molecules such as proteins and nucleic acids, which then went on to form single-stranded RNA and its more complex cousin, the double-stranded DNA.

• Scientists believe this process kicked off most likely around hydrothermal vents deep in the ocean.

Q3. Recently seen in news Zojila Tunnel will connect

a. Jammu and Srinagar

b. Leh and Kargil

c. Srinagar and Leh

d. Manali and Leh

Answer (c)

Explanation:

• The Zojila tunnel will be India’s longest road tunnel and is expected to be Asia’s longest bi-directional tunnel, boasting a length of 14.15 km. The tunnel will connect Srinagar and Leh.

• The upcoming Zojila tunnel will provide perennial connectivity between Ladakh and the rest of the country. This will benefit civilians living and employed in the region and the military by expediting the movement of troops and supplies in this vitally important strategic region.

• A connecting tunnel from Z-Morh on NH1 to the Zojila tunnel will be built in the Zojila Ghats between Sonmarg and Kargil. The work on the entire 33-km span is spread between two union territories – Jammu and Kashmir and Ladakh.

• During harsh winters, this route is closed due to fears of avalanches, landslides and slippery roads, with areas beyond the pass cut off from the rest of the country for at least five months.

Q4. With regard to the Lithium-ion batteries, consider the following statements

1. The energy density of lithium-ion cells is nearly four times higher than that of nickel-cadmium batteries.

2. Lithium metal is very feebly reactive

3. They use aqueous electrolyte solutions.

Which of the statement(s) given above is/are correct?

a. 1 and 2 only

b. 1 and 3 only

c. 3 only

d. 2 and 3 only

Answer (b)

Explanation:

• The energy density of lithium-ion cells used in today’s mobile phones and electric vehicles is nearly four times higher than that of older- generation nickel-cadmium batteries.

• Lithium-ion batteries use aqueous electrolyte solutions, where ions transfer to and fro between the anode (negative electrode generally made of graphite) and cathode (positive electrode made of lithium), triggering the recharge and discharge of electrons.

• Lithium-ion batteries are seen as sufficiently efficient for phones and laptops, but they still lack the range that would make EVs a viable alternative to internal combustion engines.

• One major problem is that lithium metal is extremely reactive. The main form of lithium corrosion is dendrites, which are branched lithium structures that grow out from the electrode and can potentially pierce through the separator and onto the other end, short-circuiting the cell.

• In current lithium-ion batteries, in which the electrolyte is a flammable liquid, dendrite formation can trigger a fire.

Q5. Which of the following dance forms is not recognised as the classical dance of India?

a. Bharatnatyam

b. Mohiniattam

c. Kathak

d. Yakshagana

Answer (d)

Explanation:

There are eight classical dance styles in India:

Bharatanatyam

Kathak

Odissi

Manipuri

Mohiniyattam

Kuchipudi

Kathakali

Sattriya