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Conductors and Insulators

Which of thes...

Question

Which of these is not a part of an electric bulb?
(a) Powdered manganese dioxide
(b) A filament
(c) A glass mount
(d) Terminals

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Solution

(a) powdered manganese dioxide
A powdered manganese dioxide is not a part of an electric bulb.

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Similar questions

Q. Fill in the blanks with the correct words.
1. The part of an electric bulb that glows is called the ................... (filament/terminal).
2. You will find ammonium chloride paste and powdered manganese dioxide in ................ (a dry cell/an electric switch).
3. Primary cells ................... (can/cannot) be recharged one they are used up.
4. An insulator is a ...................... (bad/good) conductor of electric current.
5. Wood is an example of ................... (a conductor/an insulator).

Q. The filament of an electric bulb glows because, when electric current flows through it,
(a) a chemical reaction takes place
(b) the filament heats up
(c) the terminals heat up
(d) the filament cools down

Question 3

In an electric bulb, light is produced due to the glowing of

(a) the glass case of the bulb.

(b) the thin filament.

(c) the thick wires supporting the filament.

(d) gases inside the glass case of the bulb.

Q. Which of these is a physical and irreversible change?
(a) burning of a paper
(b) evaporation of water
(c) breaking of a glass tumbler
(d) lighting of an electric bulb

Q. Which of these is not a part of the male part of a flower?
(a) filament
(b) anther
(c) style
(d) pollen grains

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