1)

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

Class 10 Physics

A)

2 A

B)

4 A

C)

8 A

D)

16 A

E)

32 A

2)

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

Class 10 Physics

A)

2

B)

3

C)

4

D)

6

E)

7

3)

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

Class 10 Physics

A)

current

B)

voltage

C)

resistance

D)

None of these

4)

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

Class 10 Physics

A)

each of 5 Ω

B)

6 Ω and 4 Ω

C)

7 Ω and 4 Ω

D)

8 Ω and 2 Ω

5)

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?

Class 10 Physics

A)

484 Ω

B)

48 Ω

C)

400 Ω

D)

48.4 Ω

6)

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

Class 10 Physics

A)

more length

B)

less radius

C)

less length

D)

more radius

7)

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

Class 10 Physics

A)

2.5 A

B)

25 A

C)

10 A

D)

11 A

E)

100 A

8)

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

Class 10 Physics

A)

300%

B)

400%

C)

500%

D)

600%

E)

700%

9)

The resistivity does not change if

Class 10 Physics

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

10)

Electric potential is a:

Class 10 Physics

A)

scalar quantity

B)

vector quantity

C)

neither scalar nor vector

D)

sometimes scalar and sometimes vector