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1. What is 5,200,000 expressed in scientific notation?

a) 5.2 x 10⁵
b) 5.2 x 10⁶
c) 5.2 x 10⁷
d) 5.2 x 10⁸

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Here are some MCQs about rational and irrational numbers, along with explanations:

Instructions: Choose the best answer for each question.

1. Which of the following is a rational number?

a) √2
b) π
c) 3/4
d) √7

Answer: c) 3/4

Explanation: A rational number can be expressed as a fraction of two integers (a/b, where b≠0). 3/4 is already in this form.

2. Which of the following is an irrational number?

a) 0.5
b) -2
c) √9
d) √5

Answer: d) √5

Explanation: Irrational numbers cannot be expressed as a simple fraction. √5 is a non-repeating, non-terminating decimal.

3. Which of the following is NOT an example of an irrational number?

a) π
b) √16
c) √2
d) √(8/23)

Answer: b) √16

Explanation: √16 = 4, which is a whole number and can be expressed as a fraction (4/1).

4. Which of the following is a rational number?

a) 0.333... (repeating decimal)
b) 0.123456789 (terminating decimal)
c) 1.41421356... (non-repeating, non-terminating)
d) π (approximately 3.14159...)

Answer: a) 0.333... (repeating decimal)

Explanation: Repeating decimals can always be expressed as a fraction. 0.333... is equivalent to 1/3.

5. Which of the following numbers is irrational?

a) -7/8
b) √100
c) √3
d) 2.5

Answer: c) √3

Explanation: √3 is a non-repeating, non-terminating decimal.

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1. Antonym: TACITURN
• a) garrulous
• b) languid
• c) fervent
• d) stoic

2. Synonym: INIMICAL
• a) beneficent
• b) inquisitive
• c) conciliatory
• d) unruly

3. Antonym: VORACIOUS
• a) ravenous
• b) abstemious
• c) scrupulous
• d) sagacious

4. Synonym: PERSPICACIOUS
• a) uncanny
• b) astute
• c) unyielding
• d) meticulous

5. Antonym: EPHEMERAL
• a) transient
• b) persistent
• c) irrelevant
• d) serene

Which of the following is NOT a field of biotechnology?
  * a) Genetic engineering
  * b) Bioremediation
  * c) Nanotechnology
  * d) Bioinformatics

The use of microorganisms to clean up environmental pollution is called:
  * a) Bioremediation
  * b) Bioaugmentation
  * c) Biopesticides
  * d) Biofuels

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The process by which cells engulf large particles is called:
  * a) Exocytosis
  * b) Endocytosis
  * c) Diffusion
  * d) Osmosis

1. X-rays are a type of electromagnetic radiation with:
  * a) Longer wavelengths than visible light
  * b) Shorter wavelengths than visible light
  * c) The same wavelength as visible light
  * d) No wavelength

Which of the following is NOT a type of energy?

a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Momentum