22 August Aj ka Test Ma Aya Howa Accedmic Ka Mcqs Or In Ka Answer

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• AFNs Accedmic Experien...

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6 Ans non of these , Rickets cause due to deficiency of Vitamin D . ❤

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[@sanaasif4459]

Mcqs no 8:
When a Grignard reagent (RMgX) reacts with ethanol (CH₃CH₂OH), it produces ethane (CH₃CH₃) and magnesium ethoxide (Mg(OCH₂CH₃)X), not acetaldehyde.
The reaction is:
RMgX + CH₃CH₂OH → CH₃CH₃ + Mg(OCH₂CH₃)X
Grignard reagents react with alcohols to form alkanes and magnesium alkoxides.

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[@sanaasif4459]

Assalam u alaikum Sir 3rd mcqs answer will be:
When a wire is cut into four equal parts, the resistivity of the material itself does not change. When a wire with resistance \( R \), cross-sectional area \( A \), and length \( L \) is cut into 4 equal parts:
### Key Concepts:
1. **Resistivity (\(
ho \))**: A material property that remains constant regardless of the dimensions of the wire.
2. **Resistance**: Given by the formula \( R = \frac{
ho L}{A} \), where \(
ho \) is resistivity, \( L \) is length, and \( A \) is the cross-sectional area.
### When the wire is cut into 4 equal parts:
- Each part has a length \( \frac{L}{4} \).
- The resistivity (\(
ho \)) of the material remains **unchanged** because it is a property of the material itself, not dependent on the dimensions.
### Conclusion:
The resistivity of the wire remains the **same** after cutting it into 4 equal parts.

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