Electricity Two wires each carrying current i are shown. The magnetic field at P (midway
between the wires) is described by which statement?
(1) Magnetic fields are in opposite direction and net field is equal to zero.
(2) Magnetic fields due to two wires are in the same direction
(3) Magnetic fields are in opposite direct ion but net field is not zero
(4) magnetic fields are in the same direction and equal to two times the field
due to one wire.
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 1 Solution : -. |
Electricity A resistance wire of uniform cross section is in the form of a ring. The
two diametrically opposite points are connected through a source of emf via an
ammeter. A conducting wire is now connected across AB, A1 B3 & then A2B2 one by
one .
If ammeter reads I1 , I2 & I3 respectively :
(1) I1 > I2 > I3
(2) I3 = I1 > I2
(3) I1 = 0, I2 > I3
(4) I3 = 0, I1 < I2
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 1 Solution : -. |
Electricity Out of two bulbs 50W - 220 V and 100W-220V, which one will glow brighter if
(a) connected in series (b) when connected in parallel
(1) (a) 50 W (b) 100 W
(2) (a) 100 W (b) 100 W
(3) (a) 100 W (b) 50 W
(4) none of the above
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 1 Solution : -. |
Electricity One Volt is equal to -
(1) 1 Joule
(2) 1 Newton/Coulomb
(3) 1 Joule/Coulomb
(4) 1 Coulomb/Newton
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 3 Solution : -. |
Electricity The device used for measuring electric current is
(1) generator
(2) galvanometer
(3) ammeter
(4) motor
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 3 Solution : -. |
Electricity Suppose five resistances, each of 10 ohm, are provided t o you. You are free
to get the desired value by combining them. The desired value will lie in
between
(1) 2 ohm to 50 ohm
(2) 20 ohm to 40 ohm
(3) 12 ohm to 50 ohm
(4) 10 ohm to 60 ohm
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 1 Solution : -. |
Electricity In house electrical circuit s the fuse wire for safety should be of
(1) High resistance - high melting point
(2) Low resistance - high melting point
(3) Low resistance - low melting point
(4) High resistance - low melting point
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 4 Solution : -. |
Electricity If current through a resistance is increased by 100%
simultaneously reducing resistance value to 25%, the new power
dissipated will be
(1) No change
(2) Increased by 100%
(3) Decreased by 400%
(4) Increased by 400%
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 1 Solution : -. |
Electricity What is the equivalent resistance of the following arrangement between M
and N
(1) R/2
(2) R/3
(3) R/4
(4) R/6
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 2 Solution : -. |
