Physics for 3rd gread secondary school

1- The equivalent unit to coulomb/s is ................
Volt
Ampere
Ohm
Farad

2- Apotential difference between two points when a work of 30 Joules needed to transfer 10 coulombs between the two points is equal to ............... V
0.3
3
30
300

3- if the length of a copper wire is doubled and its cross-section area is decreased to its half , then its resistance ................
Doubles
Decreases to its half
Increases four times
Decreasesto its quarter

4- If a wire is stretched so that its length incresed to the double , then its resistance increases to ............... its original value. 
Double
Half
4 times
Remains constant

5- Two wires are of the same length and resistance but one of them is copper and the other is iron , so the ratio     r iron : r copper equals .................
Resistivity of iron : Resistivity of copper
Resistivity of iron : √Resistivity of copper
√Resistivity of iron :Resistivity of copper
√Resistivity of iron : √Resistivity of copper

6- The product of resistivity and conductivity for the same material .................... One. 
Is greater than
Is less than
Equals
Remains constant

7- Two resistors one of them is 1 ohm are connected in series , then their equivalent resistance ..............  One ohm. 
Is greater than
Equals
Is less than.
Remains constant

8- A group of equal resistors connected in series , so their equivalent resistance was 100 , ohm when they are connected in parallel their equivalent resistance become 4 ,ohm then the value of one of them is.  ............ Ohm
20
25
100
125

9- The equivalent resistance of three identical resistors connected in parallel = 2 ohm , so its equivalent resistance in series is equal to ................. Ohm
6
12
18
24

10- When two resistors R , 4R are connected in parallel with a battery , then the consumed power in resistor R is ........... The consumed power in resistor 4R 
Four times
Double
Equal to
Quarter