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Electric Bell

During a door...

Question

During a doorbell ringing

A

Current always flows in the circuit

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B

Electromagnet is always present

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C

Striker is always in contact with metal gong

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D

Striker always repeatedly hits metal gong

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Solution

The correct option is D Striker always repeatedly hits metal gong
Striker repeatedly hits the metal gong when doorbell is ringing.
This can be observed in regular bells used at homes.

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Q. Question 12
Elements with valency 1 are

(a) always metals
(b) always metalloids
(c) either metals or non-metals
(d) always non-metals

Q. Question 12
Elements with valency 1 are

(a) always metals
(b) always metalloids
(c) either metals or non-metals
(d) always non-metals

Q. Give reasons for the following:
(i) Sodium is more reactive than aluminium.
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(iv) Metal ions are always positively charged.
(v) Metal ions always get discharged at the cathode during electrolysis.
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(vii) Metals are always monoatomic.
(viii) Sodium and potassium cannot be kept exposed to air.
(ix) Sodium and potassium should not be treated with acids.
(x) Hydrogen is not a metal but it has been assigned a place in the reactivity series of metals.

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(a) always metals

(b) always non-metals

(c) always metalloids

(d) either metals or non-metals

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