Page 73 - CHAPTER-1 (Electricity)

CHAPTER 1

ELECTRICITY

TRUE- FALSE

1- TRUE

2- TRUE

3- TRUE
4- TRUE

5- TRUE

6- TRUE

7- TRUE

( SHORT ANSWER TYPE )

1- It’s a S.I. unit of resistance . one ohm is the resistance of a conductor in which
if the potential difference of I volt is applied across the conductor and one ampere

current is flowing in it .

2- Q has more resistance as R is inversely proportional to cross-sectional area .

3- It will decrease .
4- Remains same

5- Due to increase in temperature

6- They are used to make standard resistors because Manganin has low

temperature coefficient of resistance as a result change in temperature does not
affect it a lot and Manganin has high resistivity.

7- 250 volt

8- 5/6 Amp.
9- 2160 Coulomb.

10- The resistivity of a substance is the resistance of a wire of that substance of

unit length and unit area of cross-section. Its S. I. unit is ohm × m. An insulator will
have higher resistivity.

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