Class 10 Physics1)A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it is

Correct Option: C

8 A

Class 10 Physics2)To get 2 Ω resistance using only 6 Ω resistors, the number of them required is

Correct Option: B

3

Three resistors of 2 Ω is required to get 6 Ω because resultant is more than individual so they all must be connected in series.

Class 10 Physics3)Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is

Correct Option: B

voltage

In parallel combination, voltage remains same across two points.

Class 10 Physics4)Two resistors are connected in series gives an equivalent resistance of 10 Ω. When connected in parallel, gives 2.4 Ω. Then the individual resistance are

Correct Option: B

6 Ω and 4 Ω

In series, Rs = R1 + R2 = 10 Ω

Class 10 Physics5)he resistance of hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamp, when not in use?

Correct Option: A

484 Ω

Class 10 Physics6)A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of

Correct Option: D

more radius

In order to get the working of heater properly, fused wire of higher rating must be used.

Class 10 Physics7)A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is

Correct Option: C

10 A

Total power used, P = P1 + P1 = 1500 + 500 = 2000 W.

Current drawn from the supply,

Class 10 Physics8)If the current I through a resistor is increased by 100 % (assume that temperature remains unchanged), the increase in power dissipated will be

Correct Option: A

300%

Class 10 Physics9)The resistivity does not change if

Correct Option: C

the shape of the resistor is changed

The resistivity does not change if the shape of resistor is changed because nature of material will remain same.

Class 10 Physics10)Electric potential is a:

Correct Option: A

scalar quantity

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