ANS:D - 4

No answer description is available. 

ANS:B - <<

No answer description is available. Let's discuss.

ANS:D - is measured in diopter.

The focal length f is positive for converging lenses and negative for diverging lenses. The reciprocal of the focal length, 1/f, is the optical power of the lens. If the focal length is in meters, this gives the optical power in dioptres (inverse meters).

ANS:C - 4

∇ . D = r.

ANS:D - hold up large amount of liquid in the packing.

An ideal tower packing should not hold up a large amount of liquid in the packing. Here's why:

1. Efficient Mass Transfer: Tower packing is used in distillation and absorption columns to increase the contact surface area between the liquid and vapor phases, facilitating mass transfer. If a packing material holds a large amount of liquid, it can impede the flow of vapor and liquid through the column, reducing the efficiency of mass transfer.
2. Minimized Liquid Holdup: Ideally, tower packing should allow for efficient drainage of liquid to prevent excessive liquid holdup within the packing material. Excessive liquid holdup can lead to flooding and decreased column efficiency.
3. Enhanced Contact between Phases: Tower packing with a design that minimizes liquid holdup ensures that there is more contact between the liquid and vapor phases, promoting efficient mass transfer and separation of components in the column.

ANS:A - 1500

The speed of sound in ordinary water is approximately 1500 m/sec. This value can vary slightly depending on factors such as temperature and pressure, but under standard conditions, 1500 m/sec is a commonly accepted value for the speed of sound in water.

ANS:C - Ola

Ola Mobility launched its e-bike taxi service in Delhi and Hyderabad, planning to deploy 10,000 electric scooters in both cities. The expansion follows a successful pilot in Bangalore, where Ola experienced a 40% market expansion with over 1.75 million rides in just three months.

ANS:A - Kenya

Kenya recently announced the discovery of Coltan deposits within its borders, presenting a potential economic boost. Coltan is a valuable mineral used in electronics and electric car batteries, and its responsible extraction is crucial due to ethical concerns related to environmental destruction and labour rights abuses.

ANS:B - Barcelona

Barcelona won the Spanish Super Cup for the 14th time.

ANS:D - Tamil Nadu

The previously reported Agasthyagama beddomii, the first species in the Agasthyagama genus, was found in the Sivagiri hills of Tamil Nadu. The recent discovery of Agasthyagama edge, a new diminutive lizard species, was made in the biodiverse forests of the Western Ghats at Kulamavu in Idukki.