IT Companies & Founders - Set 1 Set 2: Famous IT Companies and Their Founders 1. Who founded Twitter? Answer: Jack Dorsey, Biz Stone, Evan Williams, and Noah Glass Twitter began as a side project of Odeo in 2006. 2. Who is the founder of Tesla (tech visionary)? Answer: Elon Musk (co-founder) Elon Musk joined Tesla shortly after its founding and is its key visionary. 3. Who founded Oracle Corporation? Answer: Larry Ellison, Bob Miner, and Ed Oates Founded in 1977, Oracle became a database software leader. 4. Who is the founder of Alibaba? Answer: Jack Ma Alibaba was launched in 1999 in China as an e-commerce platform. 5. Who founded Infosys? Answer: Narayana Murthy and six others Infosys began in India in 1981 with a team of engineers. 6. Who founded Snapchat? Answer: Evan Spiegel, Reggie Brown, and Bobby Murphy Snapchat was launched in 2011 as Pic...
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Class X Math- Real Numbers- Set 4
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Class X Math - Real Numbers (Set 4)
Class X Mathematics – Chapter 1: Real Numbers (Set 4)
1. Which of the following numbers is both rational and integer?
A. √3
B. 2
C. π
D. 3/2
Answer: B. 2
Explanation: 2 is an integer and also a rational number (can be written as 2/1).
2. The prime factorization of 36 is:
A. 2 × 2 × 3
B. 2 × 3 × 3
C. 2² × 3²
D. 3 × 3 × 3
Answer: C. 2² × 3²
Explanation: 36 = 2 × 2 × 3 × 3 = 2² × 3².
3. Which of the following is the HCF of 18 and 24?
A. 6
B. 12
C. 24
D. 36
Answer: A. 6
Explanation: 6 is the highest number that divides both 18 and 24.
4. If two numbers are co-prime, then their HCF is:
A. 0
B. 1
C. Product of numbers
D. LCM of numbers
Answer: B. 1
Explanation: Co-prime numbers have no common factors other than 1.
5. The decimal expansion of 7/25 is:
A. Terminating
B. Non-terminating repeating
C. Non-terminating non-repeating
D. None of these
Answer: A. Terminating
Explanation: 7/25 = 0.28 which terminates.
6. Which of these numbers has a non-terminating repeating decimal expansion?
A. 1/4
B. 3/5
C. 2/9
D. 7/8
Answer: C. 2/9
Explanation: 2/9 = 0.222... which repeats infinitely.
7. LCM of 8 and 12 is:
A. 96
B. 24
C. 4
D. 12
Answer: B. 24
Explanation: LCM(8,12) = 24 using prime factorization.
8. Which of the following is not a real number?
A. √2
B. π
C. –1
D. √–3
Answer: D. √–3
Explanation: Square root of a negative number is not real (it's imaginary).
9. If a number is divisible by both 3 and 4, then it is also divisible by:
A. 7
B. 9
C. 12
D. 6
Answer: C. 12
Explanation: LCM of 3 and 4 is 12.
10. 0.1010010001... is:
A. Terminating
B. Rational
C. Irrational
D. Repeating
Answer: C. Irrational
Explanation: It is non-terminating and non-repeating, hence irrational.
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Class X Math - Real Numbers (Set 5) Class X Mathematics – Chapter 1: Real Numbers (Set 5) 1. The value of 2⁴ × 2³ is: A. 128 B. 16 C. 64 D. 256 Show Answer Answer: A. 128 Explanation: 2⁴ × 2³ = 2⁷ = 128 2. Which of the following cannot be the HCF of two numbers? A. 1 B. 2 C. 4 D. 9 Show Answer Answer: D. 9 Explanation: HCF must divide both numbers. If no pair of integers have 9 as a common factor, it can't be their HCF. 3. If p is a prime number, then √p is: A. Rational B. Integer C. Irrational D. Whole number Show Answer Answer: C. Irrational Explanation: The square root of any prime number is irrational. 4. The product of HCF and LCM of two numbers is equal to: A. Their sum B. The larger number C. Their product D. None Show Answer Answer: C. Their product ...
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