Given:

Ravi initially had a certain number of chocolates, Bhanu =  80% of the number of chocolates that Ravi initially had.

Ravi gave 10% of his chocolates to his sister while Bhanu received from his uncle another 35% of the number of chocolates he initially had.

Bhanu finally had 54 chocolate.

Calculation:

Let total number of chocolates Ravi had is 100

Bhanu had 80 chocolates,

Total number of chocolates Bhanu have,

80 + 80 × 35/100 = 108

Value of 108 units = 54

1 unit = 0.5

So Ravi gave 10 × 0.5 = 5 chocolates to his sister.

∴ The correct option is 3

The correct answer is Magnetic Resonance Imaging.

Key Points

• Magnetic Resonance Imaging 
  • Magnetic resonance imaging (MRI) is a type of scan that uses strong magnetic fields and radio waves to produce detailed images of the inside of the body.​
  • An MRI scanner is a large tube with a powerful magnet attached to it.
  • You lie inside this tube during the scan.MRI scans can be used to examine almost any part of the body, including:
    • brain and spinal cord bones and pairs
    • breast
    • heart and blood vessels
    • internal organs, such as the liver, womb, or prostate gland

Additional Information

• Computed tomography
  • Computed tomography also known as CT scan.
  • Uses X-ray images to create a three-dimensional view of a body part or internal organ by a computer.
  • This allows physicians to visualize tissues throughout the body, reducing the need for exploratory surgery.
• Fluoroscopy
  • Fluoroscopy is a type of X-ray that shows the movement of organs, tissues or other internal structures in real time.
  • Fluoroscopy is like a film, it shows the body systems in action.
  • These include the cardiovascular, digestive, and reproductive systems.
• Positron emission tomography
  • Positron emission tomography is a nuclear medicine imaging technique that produces a three-dimensional image or picture of the body's functional processes.
  • This system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide (tracer).

Given:

Maya completes 7/10 of a work = 15 days

(Maya + Suresh) (3/10) of a work = 4 days

Formula used:

Total work = efficiency × time

Calculation:

Together (Maya + Suresh) complete a work = (4 × 10)/3 = 40/3 days

∴ The correct answer is 40/3.

The correct answer is Coliform.

Key Points

• Coliform bacteria are commonly found in the faeces of warm-blooded animals.
  • It is a group of related bacteria whose presence in drinking water may indicate contamination by disease-causing micro-organisms.
  • They directly don't cause illness but their presence in drinking water indicates that disease-causing bacteria can be present in the water system.

Additional Information

• Pseudomonas bacteria are a common form of bacteria that causes infection.
  • They tend to live and breed in soil, water, and damp area.
• Clostridium is rod-shaped bacteria that are generally found in soil, water, and the intestinal tracts of humans and other animals. Various form of clostridium bacterial causes different kind of diseases some of the once are-
  • ​Botulism- Due to Clostridium botulinum
  • Tetanus- Due to Clostridium Tetani.
• Streptococcus is a kind of spherical-shaped bacteria belonging to the family Streptococcaceae. Streptococcus contains a variety of species, some of which cause disease in humans and animals, while others are important in the manufacture of certain fermented products.
  • ​Streptococcus Lactic and Streptococcus cremoris- Used in the production of dairy products.
  • Streptococcus pygenes- Flesh-eating bacteria. etc

The correct answer is Selenium.

Key Points

• trace mineral
  • A trace element/minor element; is a chemical element whose concentration is very low.
  • These include iron, manganese, copper, iodine, zinc, cobalt, fluoride and selenium.
  • These minerals are present in living tissues of human body in small amounts.
  • Some of them are known to be nutritionally essential, others may be essential and the remainder are considered to be nonessential.
• Selenium
  • Jons Jacob Berzelius discovered the Selenium.
  • Selenium bellongs to group 16 of periodic table.
  • It belongs to the P- block of periodic tabe.

Given:

HCF of two numbers = 12

LCM of two numbers = 144

One number = 48

Formula used:

Product of two numbers = HCF × LCM

Calculation:

Let, the another number = n

According to the formula,

⇒ 48 × n = 12 × 144

⇒ n = (12 × 144)/48 = 36

So, Difference of the two numbers = 48 - 36 = 12

∴ The difference of these two numbers will be 12.

Given:

M can complete a work in 50 days.

N can complete the same work in 100 days.

Both work together for 25 days.

Concept:

The work completed is the product of rate and time.

Solution:

⇒ Rate of M = 1/50 per day, rate of N = 1/100 per day.

⇒ Rate of M and N together = rate of M + rate of N = 1/50 + 1/100 = 3/100 per day.

⇒ Work completed in 25 days = Rate × time = 3/100 × 25 = 0.75 = 75%

Therefore, 75% of the total work will be completed in 25 days.

Given:

Let, a = 25; b = 225

Concept used:

⇒ a/x = x/b

⇒ x² = ab

⇒ x = √ab

Mean proportional = √ab

Calculation:

Mean proportional = √ab

⇒ √(25 × 225) = 5 × 15 = 75

∴ The correct answer is 75.

Given: A digit which, when subtracted 15 from 7 times that digit, gives 10 more than twice that digit.

Let the number be x. Then,

⇒ 7x - 15 = 2x + 10

⇒ 7x - 2x = 10 + 15

⇒ 5x = 25

⇒ x = 5

So, The number is 5.

Hence, the correct answer is "5".

The correct answer is Amrit Bharat Express.

In News

• PM Modi to inaugurate ‘Amrit Bharat Express’ on Dec 30.

Key Points

• The Prime Minister informed about the new train series ‘Amrit Bharat’ trains after Vande Bharat and Namo Bharat and expressed delight that the first Amrit Bharat train is going through Ayodhya.
• The Prime Minister flagged off two new Amrit Bharat trains viz Darbhanga-Ayodhya-Anand Vihar Terminal Amrit Bharat Express and Malda Town-Sir M. Visvesvaraya Terminus (Bengaluru) Amrit Bharat Express. 
• This train uniquely comprises exclusively second-class and sleeper-class compartments to cater to the various travel needs.

Additional Information

• The Railway Board has issued specifications regarding the fare structure for this train, which varies based on the distance traveled.
• A defining feature of the Amrit Bharat Express is its higher ticket prices compared to other mail or express trains, by roughly 15 - 17%.
• Despite the price difference, the Amrit Bharat Express offers a new dimension to the Indian railway system and its high-speed train service.