NCERT Class X Science Class: Chapter –12. Electricity – Part-3

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Question 9:

Which of the following represents voltage?

(a)

(b)

(c)

(d)

Answer: A

Question 10:

A cylindrical conductor of length and uniform area of cross-section A has resistance . Another conductor of length andresistance of the same material has area of cross section

(a)

(b)

(c)

(d)

Answer: C

Question 11:

A student carries out an experiment and plotsthe of three samples of chrome wirewith resistances respectively (Figure). Which of the following is true?

(a)

(b)

(c)

(d)

Image Ampere and Volts

Image Ampere and Volts

Image Ampere and Volts

Answer: C

Question 12:

If the current I through a resistor is increased by (assume that temperature remains unchanged), the increase in power dissipated will be

(a)

(b)

(c)

(d)

Answer: C

Since,

Current after increased by

Percentage increase in power dissipation

Question 13:

The resistivity does not change if

(a) The material is changed

(b) The temperature is changed

(c) The shape of the resistor is changed

(d) Both material and temperature are changed

Answer C

R = Resistance (Ohms)

P = Resistivity (Rho)

I = length of conductor (metres)

a = Area (m2)

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