Material science and Corrosion

Mechanism of Cathodic Reaction
Corrosion of metals in aqueous environment takes place by an electrochemical mechanism consisting of two simultaneous reactions:
anodic reaction and cathodic reaction.
The cathodic reaction occurs at the cathodic areas of the metal surface and involves consumption of electrons released by the anodic reaction.
Meaning of Cathodic Reaction
A cathodic reaction is a reduction reaction in which electrons are gained.
It does not cause metal dissolution directly, but it
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1) Binary to Decimal Conversion

To convert a binary number to decimal, multiply each bit by its place value (2⁰, 2¹, 2², etc.) then add the results.
Example: 1011₂ = (1×2³) + (0×2²) + (1×2¹) + (1×2⁰) = 8 + 0 + 2 + 1 = 11 (decimal).


2) Advantages of Universal Gates

Universal gates are NAND and NOR gates. Their advantage is that any logical function can be implemented using just one type of gate. This makes design simpler, reduces manufacturing cost, and increases flexibility in

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Logical organisation of computer number system

(a) What is a Number System?

A number system is a way of representing numbers using a set of symbols and a base (radix).
Examples:

Decimal (base 10)

Binary (base 2)

Octal (base 8)

Hexadecimal (base 16

b) Why Digital Computers use Binary Number System?

Digital computers use binary because:

Electronic circuits have two states: ON (1) and OFF (0)

Binary is reliable and easy to implement

Less error in data processing

(c) Convert (1001.0010)₂ to Decimal

Integer part:
10012=1×23+0×22+0×21+1×20=91001₂

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QUESTION 1 (Compulsory – Short Answers)

(a) What is a Number System?

A number system is a way of representing numbers using a set of symbols and a base (radix).
Examples:

  • Decimal (base 10)

  • Binary (base 2)

  • Octal (base 8)

  • Hexadecimal (base 16)


(b) Why Digital Computers use Binary Number System?

Digital computers use binary because:

  • Electronic circuits have two states: ON (1) and OFF (0)

  • Binary is reliable and easy to implement

  • Less error in data processing


(c) Convert (1001.

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As physical and hormonal changes peak, adolescents face critical health choices regarding nutrition and substance use. These issues are deeply interconnected with the brain development we discussed earlier—the struggle between a seeking "reward system" and a still-developing "control center."
1. Nutrition and Growth -The "growth spurt" in adolescence creates the highest nutritional demand of any life stage except infancy. * Nutrient Demands: The body requires massive increases in calcium (for bone

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Adolescence is a profound transitional phase between childhood and adulthood, characterized by rapid biological, cognitive, and socio-emotional changes. It is often described as a period of "storm and stress" (as termed by G. Stanley Hall), though modern psychology views it more as a constructive period of identity formation.
1. The Nature of Adolescence -Adolescence is more than just physical growth; it is a total overhaul of the individual’s identity and capabilities.
 * Duration: Typically spans

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प्रश्न 2 (a) : इंजन के भागों के कार्य (स्केच सहित)

(i) Cylinder Head

  • सिलेंडर के ऊपरी भाग को बंद करता है

  • इसमें वाल्व, स्पार्क प्लग / इंजेक्टर लगे होते हैं

  • दहन कक्ष का निर्माण करता है

(ii) Piston Rings

  • गैस लीकेज रोकती हैं

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ਬਬਬਜਰਜਰਜਫਜ਼ਜ਼ੀਰ

ਪੰਜਾਬੀ ਵਿੱਚ ਸ਼ਬਦ ਰਚਨਾ (Word Formation) ਦੇ ਦੋ ਪ੍ਰਮੁੱਖ ਤਰੀਕੇ ਹਨ: ਅਗੇਤਰ ਅਤੇ ਪਿਛੇਤਰ। ਇਹਨਾਂ ਦੀ ਵਰਤੋਂ ਮੂਲ ਸ਼ਬਦਾਂ ਤੋਂ ਨਵੇਂ ਸ਼ਬਦ ਬਣਾਉਣ ਲਈ ਕੀਤੀ ਜਾਂਦੀ ਹੈ।
1. ਅਗੇਤਰ (Prefixes) -ਜਿਹੜੇ ਸ਼ਬਦ-ਅੰਸ਼ ਮੂਲ ਸ਼ਬਦ ਦੇ ਸ਼ੁਰੂ ਵਿੱਚ ਲੱਗ ਕੇ ਉਸ

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ਧੁਨੀ ਬੋਧ (Phonology) ਅਤੇ ਅੱਖਰ ਬੋਧ (Orthography) ਪੰਜਾਬੀ ਵਿਆਕਰਨ ਦਾ ਪਹਿਲਾ ਅਤੇ ਮਹੱਤਵਪੂਰਨ ਭਾਗ ਹਨ। ਇਸ ਵਿੱਚ ਭਾਸ਼ਾ ਦੀਆਂ ਸਭ ਤੋਂ ਛੋਟੀਆਂ ਇਕਾਈਆਂ—ਧੁਨੀਆਂ ਅਤੇ ਉਹਨਾਂ ਨੂੰ ਲਿਖਣ ਲਈ ਵਰਤੇ ਜਾਂਦੇ ਚਿੰਨ੍ਹਾਂ (ਅੱਖਰਾਂ) ਬਾਰੇ ਜਾਣਕਾਰੀ ਮਿਲਦੀ

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