Explanation

The International Committee of the Red Cross was declared the winner of the Peace Prize both in 1917 and in 1944. 

Explanation

Switzerland’s neutrality was formally recognized at the Congress of Vienna in 1815.

Since then, Switzerland has remained neutral in international conflicts.

Explanation

Quotation marks should enclose the exact spoken words.

“Please” is lowercase unless starting a new sentence.

Explanation

NPT stands for Non-Proliferation Treaty

NPT signed: 1968

Not a member of the NPT:

1. India,
2. Israel,
3. North Korea,
4. Pakistan 
5.  South Sudan 

Members of the five NPT nuclear-weapon states:

1. China
2. France
3. Russia
4. the United Kingdom

Languages:

1. English
2. Russian
3. French
4. Spanish
5. Chinese

Explanation

Criteria is a plural noun. Its singular form is criterion. 

options are incorrect

Index is a singular noun. Its plural forms are indices (often used in formal/academic contexts) or indexes (more common in general usage).

Analysis is a singular noun. Its plural form is analyses.

Crisis is a singular noun. Its plural form is crises. 

Explanation

The Tibetan Plateau (Pamir Plateau) is known as the Roof of the World.

It's also the thickest crust in the world, between 70 and 90 kilometers.

The plateau is the world's largest and highest.

Its average elevation is more than 4,500 meters (14,764 feet).

Additional information 

The Shandur Pass in Pakistan is also sometimes called "the roof of the world".

Explanation

Let the numbers be x, 2x, 3x.

Product = x × 2x × 3x = 6x³ = 750

x³ = 750/6 = 125

x = ∛125 = 5

Numbers are 5, 10, 15.

Highest number = 3x = 15

Explanation

Frequency (f) is inversely proportional to wavelength (λ):

f ∝ 1/λ => f = k/λ => k = fλ

Given: f1 = 100 kHz, λ1 = 3000 m; λ2 = 500 m

k = f1λ1 = f2λ2

100 kHz × 3000 m = f2 × 500 m

f2 = (100 kHz × 3000 m) / 500 m

= 600 kHz

Explanation

Blue blood refers to someone of noble or aristocratic lineage.

The term originated from the visible veins of European royals, indicating their high social status.

Explanation

45 minutes is ¾ of 1 hour, so the ratio is ¾.

Similarly, ¾ of 30 seconds = 22.5 seconds.