Question

Which of the following statements is/are correct?
(i) Longer line in the symbol for a cell represents its
negative terminal.
(ii) The combination of two or more batteries is called
a cell.
(iii) Fuse wire is made up of alloys which has high
melting point.
(iv) Electromagnet loses its magnetism when the current
flowing through it is switched off.
A. (iv) only
B. (ii) and (iii) only
C. (i), (ii) and (iv) only D. (i), (ii), (iii) and (iv)​

Answer 1

Answer:

b. (ii) and (iii) only

Answer 2

The correct statements are:

(i) Longer line in the symbol for a cell represents its negative terminal.

(iii) Fuse wire is made up of alloys which have a high melting point.

(iv) Electromagnet loses its magnetism when the current flowing through it is switched off.

Therefore, the correct answer is C. (i), (ii) and (iv) only.

Explanation:

(ii) is incorrect because a combination of two or more cells is called a battery, not a cell.

(i) is correct because in a standard cell symbol, the longer line represents the negative terminal, while the shorter line represents the positive terminal.

(iii) is correct because fuse wire is made up of materials with a high melting point, such as copper, aluminum, or alloys like tin-lead or nickel-chromium.

(iv) is correct because an electromagnet works by creating a magnetic field when current flows through its coil. When the current is turned off, the magnetic field collapses, and the magnetism is lost.

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