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Acid used for making permanent markings ...

Acid used for making permanent markings on the glass surface is.

A

`HNO_3`

B

(B) HF

C

(C) `HIO_3`

D

(D) `H_2SO_4`

Text Solution

Verified by Experts

The correct Answer is:
B
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Why should the material used for making permanent magnets have high coercivity ?

(i) Write two characteristics of a material used for making permanent magnets. (i) Why is core of an electromagnet made of ferromagnetic materials ?

Knowledge Check

  • The alloy used for making permanent magnet is

    A
    Alnico
    B
    Invar
    C
    Magnalium
    D
    Chromsteel

  • It is used to make permanent magnet :

    A
    Soft iron
    B
    Germanium
    C
    Silicon
    D
    Steel

  • Alnico is used for making permanent magnets becoause it has

    A
    High coercivity and high retentivity
    B
    high coercivity and low retentivity
    C
    low coercivity and low retentivity
    D
    low coercivity and high retentivity

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    Draw an appropriate schematic diagram showing common domestic circuits and discuss the importance of fuse. Why is it that a burnt out fuse should be replaced by another fuse of identical ratting? or Why is pure iron not used for making permanent magnets? Name one material used for making permanent magnets. Describe how permanent magnets are made electrically. State two examples of electrical instruments made by using permanent magnets.

    Can quicklime be used for making cement and glass ?

    Why is steel preferred for making permanent magnets?

    The alloy that is used for making permanent

    The material for making permanent magnets should have:

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