Page 55 - CHAPTER-1 (Electricity)
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CHAPTER 1
ELECTRICITY
6. A battery of 10 volts is carrying 20,000 C of charge through a
resistance of 20 Ω. What will be the work done in 10 seconds?
5
3
(a) 2 × 10 joule (b) 2 × 10 joule
2
(c) 2 × 10 joule (d) 2 × 10 joule
4
7. A boy records that 4000 joules of work is require transferring 10
coulombs of charge between two ends of a resistor of 50 Ω. The
current that passes through it is:
(a) 2 ampere (b) 4 ampere
(c) 8 ampere (d) 16 ampere
8. Electrical resistivity of any metallic wire depends upon
(a) thickness (b) shape
(c) nature of the material (d) length
9. A wire of length /, material resistivity ρ is divided into two equal
parts. The resistivity of any of the two parts is equal to,
(a) ρ (b)
2
(c) 2 ρ (d) 4 ρ
10. Two wires of the same length and made of two different materials
of resistivity ρ1 and ρ2 are connected in series combination to a
source of potential V. The equivalent resistivity for the same area is
ρ ρ
1 2
(a) + (b) ρ +ρ 2
2
1
1
(c) (ρ +ρ ) (d)( |ρ +ρ 2 )
1
1
2
ρ ρ 2
1 2
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