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General Science

Balanced Diet

Chapter: Health & Diseases

Question 1 of 4 NDA MCQ

Galvanization is a method of protecting iron from rusting by coating with a thin layer of

Detailed Explanation

Explanation: During Galvanization more reactive metal like zinc is coated on the surfaced iron. So this more reactive metal undergoes corrosion in comparison to iron.

Question 2 of 4 NDA MCQ

Human body works in the pH range of:

Detailed Explanation

Correct Answer

✓ Option (b) is correct. The human body operates in a pH range of 7.0 to 7.8 for maintaining physiological processes.

📖 Core Biological Concept

The pH level is crucial for numerous biological functions, including enzymatic reactions, metabolic processes, and oxygen transport, predominantly maintained around 7.35 to 7.45.

🔬 Anatomical & Physiological Mechanism

The blood's pH is tightly regulated by buffer systems, including bicarbonate and proteins, ensuring homeostasis. Deviations can lead to acidosis or alkalosis, affecting functionality.

🔍 Option Analysis

  • A: 6.8 – 7.2: Too acidic for optimal physiological functions.
  • C: 6.5 – 7.5: Unhealthy; excessive acidity may be harmful.
  • D: 7.5 – 8.0: Above normal, indicating alkalosis.

⚡ Memory Hook (Mnemonic)

Remember "7 is Best": The human body strives to maintain a blood pH closest to 7.4.

6. Visual Suggestion

6. Visual Suggestion

A pH scale chart illustrating the neutral point, acidic, and alkaline ranges, with annotations indicating biological significance (enzymes, blood functions, etc.).

📖 Factual Verification & Reference

📖 Factual Verification & Reference:

Verified against NCERT Class 11 Biology, Chapter: Human Physiology.

Question 3 of 4 NDA MCQ

Which one of the following combinations most appropriately represent the components of a balanced diet?

Detailed Explanation

Correct Answer

✓ Option A is correct. A balanced diet should include all essential nutrient components for optimal health.

📖 Core Biological Concept

A balanced diet comprises the correct proportions of all necessary nutrients for the body’s maintenance, growth, and repair.

🧪 Step-by-Step Breakdown

  • Carbohydrates: Main energy source.
  • Proteins: Essential for growth and tissue repair.
  • Fats: Necessary for energy supplies and absorbing vitamins.
  • Vitamins: Crucial for various metabolic processes.
  • Minerals: Important for bone health and cellular functions.
  • Fibres: Aids in digestion and prevents constipation.
  • Water: Vital for all bodily functions, including temperature regulation.

🔍 Option Analysis

  • Option B: Missing fibres and water.
  • Option C: Excludes fibres and fats.
  • Option D: Lacks carbohydrates and proteins.

⚡ Mnemonic / Speed-Run

MFP VCFW - Remember: Macros (Macronutrients) - M(Protein) F(Fat) P(Carbohydrates); Vitamins (V) & Minerals (M); Fiber (F) & Water (W).

6. Visual Suggestion

Illustration of a balanced plate showing sections divided for carbohydrates, proteins, fats, vitamins, minerals, and fibres, alongside a water bottle for hydration.

📖 Factual Verification & Reference

📖 Factual Verification & Reference:

Verified against NCERT Class 11 Biology, Nutrition chapter.

Question 4 of 4 NDA MCQ

The formula for conversion between Fahrenheit and Celsius is °F = X + (1.8 × °C) What is factor X?

Detailed Explanation

Solution

Option (a) is correct.

Explanation:

\[ \degree F = X + (1.8 \times \degree C) \]
When water freezes at 0 degrees Celsius and boils at 100 degrees Celsius, the Fahrenheit equivalents are 32 degrees and 212 degrees respectively. Therefore, we can set up the following equations:
\begin{aligned} &\degree F = 32 \quad \text{(when } \degree C = 0 \text{)} \\ &\degree F = 212 \quad \text{(when } \degree C = 100 \text{)} \end{aligned}
Substituting for \(\degree C\):
\[ 212 = X + (1.8 \times 100) \]
Simplifying gives:
\[ 212 = X + 180 \Rightarrow X = 212 - 180 \Rightarrow X = 32 \]
Therefore, factor \(X\) is 32.
📌 Hints / Properties Used:
  • Conversion formula for Celsius to Fahrenheit.
  • Substitution method in equations.
📊 Visual Diagram Suggestion:

Illustrate a linear chart plotting degrees Celsius on the X-axis and degrees Fahrenheit on the Y-axis, marking key points (0°C to 32°F, 100°C to 212°F) to visualize the conversion relationship.

📖 Factual Verification & Reference:

Verified against NCERT Class IX Science, Chapter on Heat.

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