grad 12 quiz 3 physics

when the resistivity of a conductor increased to double its value then its conductivity ......

• increased to double its value

• increased 4 times its value

• decreased to half its value

• remains constant

two resistors are connected in parallel one of them equal one ohm then the equivalent resistance of them is .....

• more than one ohm

• less than one ohm

• equal one ohm

two equal resistors when connected in series their equivalent resistance is 12 ohm, then if connected in parallel their equivalent resistance equal ........

• 3 ohm

• 6 ohm

• 12 ohm

• 24 ohm

the equivalent unit of ohm is ....

• ampere . meter

• ampere . volt

• volt / coulomb

• volt / ampere

Kirchhoff,s current law (first law) is called .....

• Law of conservation of energy

• law of conservation of mass

• law of conservation of charges

If the potential difference between the terminals of a conductor of resistance 4 ohm is 12 V, then the current passing through the conductor is ........

• 8 A

• 16 A

• 3 A

• 48 A

A wire of length 2 m and cross sectional area 3 x 10 ^-4 m² , if the resistivity of its material is 3 x 10 ^-5 ohm.m then its resistance equal ........

• 9 ohm

• 6 ohm

• 2 ohm

• 0.2 ohm

In the opposite figure the reading of the ammeter (A) equal

• 6 A

• 3 A

• 9 A

• 15 A

In the opposite figure the reading of the voltmeter (V) is .....

• 24 V

• 48 V

• 60 V

• 72 V

In the opposite figure the value of the current (I) and its direction is

• 2 A from a to x

• 2 A from x to a

• 4 A from x to a

• 4 A from a to x