GK: Class 12 General Q&A · Page 6
3,658 free answers on GK (General) for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
What is 0.02 least count
A 0.02 mm least count typically refers to a vernier caliper with 25 divisions on its vernier scale. This measurement capability is achieved when the main scale has 0.5 mm graduations and the vernier scale spans 24.5 mm across 25 divisions, resulting in a least count calculation of (1 MSD - 1 VSD) = 0.5 mm - 0.49 mm = 0.02 mm. This represents a common precision level for general-purpose vernier calipers used in workshops and educational settings. Instruments with 0.02 mm least count st
- GeneralClass 12All
What is the least count of a micrometer
The least count of a standard micrometer screw gauge is 0.01 mm (or 10 micrometers). This precision measurement is achieved through the instrument's design, which combines a main scale marked in 0.5 mm increments with a circular thimble scale divided into 50 divisions. When the thimble rotates one complete revolution, the spindle advances by 0.5 mm, making each division on the thimble represent 0.01 mm (calculated as 0.5 mm ÷ 50). This level of precision makes
- GeneralClass 12All
What will be the value of money in 2050
Predicting the exact value of money in 2050 is impossible due to numerous economic variables, but we can project based on historical inflation trends. Assuming average annual inflation of 3% (close to long-term historical averages in developed economies), money loses approximately half its purchasing power every 23-24 years. By 2050 (roughly 25 years from now), $100 today would have the purchasing power equivalent of approximately $48-52 in today's dollars. However, actual outcomes co
- GeneralClass 12All
What is the best age to start investing
The best age to start investing is as early as possible ideally in your early 20s or even teens if you have earned income. Starting young provides the most powerful advantage in investing: time for compound growth. Even small amounts invested early can grow substantially over decades, often outperforming larger amounts invested later due to compound returns. For example, investing $200 monthly starting at age 25 versus age 35 could result in hundreds of thousands more by retirement at
- GeneralClass 12All
What is 12.50 an hour annually
At $12.50 per hour, assuming full-time work (40 hours per week, 52 weeks per year), annual earnings would be approximately $26,000. This calculation: $12.50/hour × 40 hours/week × 52 weeks/year = $26,000 annually before taxes. However, actual annual earnings might vary based on: whether the job is truly full-time year-round or has periods without work, whether overtime is available (which might pay time-and-half or double time), paid time off or holidays (which might reduc
- GeneralClass 12All
What is the last number in the world
There is no "last number" in mathematics—numbers continue infinitely without end. For any number you can name, no matter how large, you can always add 1 to create an even larger number. This is a fundamental principle: the set of integers (and real numbers) extends infinitely in both positive and negative directions. While we have names for extremely large numbers—googol (10^100), googolplex (10^googol), Graham's number, or numbers generated through arrow notation—no
- GeneralClass 12All
Is 20 million 2 crore
Yes, 20 million equals exactly 2 crore. This follows the standard conversion where 10 million equals 1 crore, so 20 million equals 2 crore. Written numerically, 2 crore is 2,00,00,000 in Indian notation or 20,000,000 in international notation. This conversion level appears regularly in mid-to-high-level business contexts: startup valuations, executive compensation packages, successful business revenues, or premium real estate portfolios. For example, if a startup raises 20 million dol
- GeneralClass 12All
Is 800 million a billion
No, 800 million is not a billion—it's 0.8 billion or eight-tenths of a billion. To reach 1 full billion, you would need 1,000 million, so 800 million falls short by 200 million. While 800 million is substantial, the distinction matters in financial contexts, especially when evaluating companies, markets, or populations. For instance, if a company raises 800 million in funding, it's approaching billion-dollar valuation but hasn't crossed that threshold yet—a psychologically
- GeneralClass 12All
How much is a sextillion
A sextillion equals 10^21 in the short scale system (American/modern international usage)—that's 1 followed by 21 zeros, or 1,000,000,000,000,000,000,000. In the long scale system (historical European), sextillion equals 10^36. Given modern international standardization, sextillion typically refers to the 21-zero version. To provide perspective on this magnitude: the number of stars in the observable universe is estimated at a few hundred billion to a trillion—far less tha
- GeneralClass 12All
Is a zillion a number
No, "zillion" is not a mathematically defined number—it's an informal colloquial expression used to describe an extremely large, indefinite amount. Unlike precisely defined terms like million, billion, or trillion, "zillion" exists purely as rhetorical exaggeration without any specific numerical value. People use "zillion" in everyday speech for emphasis when they want to indicate something is uncountably large without specifying an exact number, such as "I have a zillion errand
- GeneralClass 12All
How much is 250000 rupees in lakhs
250,000 rupees equals 2.5 lakhs. Since 1 lakh equals 100,000 rupees, dividing 250,000 by 100,000 gives you 2.5 lakhs. In Indian notation, this is written as 2,50,000 or 2.5L informally. This amount represents a meaningful sum for many Indians across various contexts. It might represent a few months' savings for middle-class families, down payment on a two-wheeler or partial payment on a car, funds for a small wedding or major family event, or seed capital for a very small business ven
- GeneralClass 12All
What is a billionaire in crores
A billionaire (in dollar terms) has wealth exceeding $1 billion, which currently equals approximately 85-90 crores dollars at prevailing exchange rates (around ₹85-90 per USD). However, if discussing rupee billionaires (someone with ₹1 billion), that equals exactly 100 crores rupees, since 1 billion = 100 crores by definition. This distinction is important: dollar billionaire status is far more exclusive globally than rupee billionaire status in India. A dollar billionaire possesses a
- GeneralClass 12All
How much is 7.8 crores in millions
7.8 crores equals 78 million. This follows the standard conversion where 1 crore equals 10 million, so 7.8 crore × 10 = 78 million. Written numerically, this is 78,000,000. This conversion is useful when presenting Indian financial data to international audiences or comparing domestic figures with global benchmarks. For example, a company with annual revenues of 7.8 crores would report 78 million rupees in international financial statements. Similarly, a real estate portfolio va
- GeneralClass 12All
Is 100k equal to 1 million
No, 100k (100 thousand) is not equal to 1 million—it's one-tenth of a million. You need 1,000k (one thousand thousand) to equal 1 million. In numerical terms, 100k equals 100,000 while 1 million equals 1,000,000. This distinction is crucial in financial communications, salary discussions, and business contexts. A job offering "100k salary" means 100,000—quite different from 1 million. In fundraising or revenue targets, reaching 100k represents an early milestone, but it's
- GeneralClass 12All
Is 20 lakh 20 million
No, 20 lakh is not 20 million it equals 2 million. Since 1 lakh equals 100,000 and 1 million equals 1,000,000, you need 10 lakhs to make 1 million. Therefore, 20 lakhs equals 2,000,000, which is 2 million. This conversion is important for accurate financial communications across different numbering systems. If someone earning 20 lakhs annually presents their salary as "20 million" to international audiences, they've overstated it by 10 times—a serious error. Conversely, if an in
- GeneralClass 12All
How big is sexagintillion
Sexagintillion equals 10^183 in the short scale system (American/modern international usage)—that's 1 followed by 183 zeros. In the long scale system (historical European), sexagintillion equals 10^360. The name derives from Latin: "sexaginta" meaning sixty, as this is the 60th term in the naming sequence beyond thousand. Numbers of this magnitude exist only in pure mathematical abstraction with absolutely no connection to physical reality or practical applications. Even the mos
- GeneralClass 12All
How many zeros is quattuorquadragintillion
Quattuorquadragintillion has 135 zeros in the short scale system (American/modern international usage), making it equal to 10^135. In the long scale system (historical European), it would have 264 zeros, equaling 10^264. The name derives from Latin: "quattuor" (four) + "quadraginta" (forty) = forty-four, as this is the 44th term in the naming sequence beyond thousand. However, like all extremely large named numbers beyond perhaps quadrillion or quintillion, quattuorquadragintillion ex
- GeneralClass 12All
What's bigger, a googol or infinity
Infinity is bigger than a googol—in fact, infinity is bigger than any specific number, no matter how large. A googol (10^100, or 1 followed by 100 zeros) is an extremely large but finite, specific number. Infinity, by contrast, is not a number at all but rather a concept describing endlessness or unboundedness. Think of it this way: no matter how large a number you name—googol, googolplex, Graham's number, or any finite number however vast—infinity is larger because
- GeneralClass 12All
Why is 37 not a prime number
Actually, 37 IS a prime number—you may be thinking of a different number. 37 is only divisible by 1 and 37 itself, which is precisely the definition of a prime number. It cannot be factored into smaller positive integers besides these two divisors. 37 is actually a notable prime with several interesting properties: it's a regular prime, a lucky prime, and a cousin prime (paired with 41). Perhaps you're thinking of 27 (which equals 3×9), 39 (which equals 3×13), or som
- GeneralClass 12All
Is 1000000000000066600000000000001 prime number
This specific number (1 followed by many zeros with 666 in the middle) is almost certainly not prime, though definitively proving primality for numbers this large requires computational verification. Numbers with special patterns like this are often composite (non-prime) because their structure makes them vulnerable to certain factorization methods. For context, determining primality of such large numbers is computationally intensive. The number you've written has 31 digits, which is