Electricity- Class - X - Vasu Classes


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Electricity- Class - X - Vasu Classes

1. Which of the following is the best conductor of electricity?

a) Silicon
b) Mica
c) Glass
d) Silver

2. When one joule work is done to move a charge from one point to another point, the potential diffrence is one volt , the value of charge must be

a) 2C
b) 1C
c) 3C
d) none

3. Conventional direction of current is

a) same as that of flow of electrons
b) direction of the flow of positive charge
c) Opposite to the direction of electrons
d) none

4. Potential diffrece between two points is measured by

a) Ammeter
b) Galvanometer
c) Voltmeter
d) Rehostat

5. What will be the electric potential of a point when 2 J work is done in bringing a charge of 0.2 C from infinity to the point

a) 100V
b) 10V
c) 20V
d) None

6. Which of the following is an alloy?

a) Magnanin
b) Nichrome
c) Germanium
d) A and B
e) all of the above

7. When 3ohm ,7ohm and 2 ohm are connected in parallel the net resistance will be

a) less than 7ohm
b) greater than 2ohm
c) less than 2ohm
d) greater than 2ohm but less than 3ohm

8. According to Ohm's law

a) I is proportional to V
b) I is proportiona l to P
c) I is proportional to q
d) All of the above

9. The factors on which the resistance of a conductor depends

a) Area of cross-section
b) Current flowing
c) Material
d) A and C
e) all of the above

10. In a series combination of the resistances

a) Current remains same through each resistance
b) Potential diffrence across each resistance remains same
c) Power of each resistance changes
d) Potential difference across each resistance is same when resistances are equal

11. When resistances are connected in parallel

a) Potential diffrence is same across each resistance
b) Current is same across each resistance
c) Both I and V are same across each resistance
d) Power of each resistance is same

12. Ohm-m is the unit of

a) resistance
b) power
c) resistivity
d) energy

13. How much energy is consumed by an electric geyser of 2KW in 2hrs

a) 1unit
b) 3units
c) 8units
d) 4units

14. What is the commercial unit of Electrical energy?

a) KWH
b) Joules
c) Watt
d) KW

15. Calculate the amount of energy consumed by 2 bulbs of 100watt each and an electric iron 750 Watt in 5 hrs

a) 17KWH
b) 8.5KWH
c) 4.75KWH
d) None

16. What are the possible net resistance by the combination of three resistances 6 Ohm each

a) 18 Ohm ,9 Ohm ,2 Ohm, 4 Ohm
b) 20 Ohm ,18 Ohm , 4 Ohm
c) 12 Ohm ,3 Ohm ,18 Ohm
d) None Of the above

17. Ammeter and Voltmeter are connected in a circuit.These are connected in

a) parallel - series
b) Series-parallel
c) Series-series
d) Parallel-Parallel

18. A metallic wire of length L and area of cross-section A has lowest resistance in which of the following cases?

a) L ,A
b) 2L ,A
c) L/2 ,2A
d) 2L , A/2

19. House wiring is done in parallel

a) To provide same rating voltage to each appliance
b) To save electricity
c) Separate switches can be used
d) A & C

20. One coloumb charge flows across the ends of a conductor in one second it means

a) work done is one joule
b) potential difference between the ends is one volt
c) current flowing is one amp.
d) Resistance of the conductor is one Ohm

21. Which one has lower resistance?

a) 110W bulb
b) 60W bulb
c) Both have equal resistance
d) Resistnce is same but current is different for each

22. How many bulbs of 6volt each can be connected in series if the supply voltage is 240V

a) 60
b) 50
c) 40
d) 25

23. If the distance between two opposite charges is doubled the force between them becomes

a) 1/4
b) 4times
c) 1/2
d) None

24. If a circular loop of wire having resistance 10 Ohm then what will be the resistance across the ends of its diameter

a) 10 Ohm
b) 5 Ohm
c) 2.5 Ohm
d) 20 Ohm

25. An electric refrigerator rated 400W operates 8 hours per day. What is the cost of energy to operate for 30 days at the rate of Rs3.00 per KWH?

a) Rs300
b) Rs250
c) Rs288
d) Rs500

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