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Right or wrong sentence.
Live wire and neutral wires have a 220 V potential difference.
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Right or wrong sentence.
Increasing the current passing through the wire decreases the magnetic field intensity.
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Write an explanation.
Period
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Write a scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
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Write a scientific reason.
Lithium and sodium are included in the same group in the periodic table.
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Nowadays MCBs are used in homes, for stop the current in the circuit which suddenly increases.
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Write scientific reason.
A coil made up of alloy Nichrome is used in the electric heater cooker as a resistor.
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Write scientific reason.
It is beneficial to carry electrical energy in AC form as it is carried over long distances.
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Write scientific reason.
Even the wire moves through the ice slab , the ice slab does not break.
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Complete the following flow chart.
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In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
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Name any two appliances which works on the phenomenon of heating effect of electric current.
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Explain the importance/uses of fuse wire.
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Distinguish between:
s-block - p-block
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Distinguish between:
Group 17 - Group 18
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An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
- What is the valency of each X and Y elements?
- Atom size of Y element is smaller than atom size of X element? Explain?
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Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
- What is an element metal or nonmetal?
- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
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When does overloading occur?
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What does overloading cause?
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