vectors and equilibrium mcqs

Q.1 If 2 A current passes through a resistor when connected to a certain battery. If the resistance is replaced by the double resistance, then the current will become
A) 2 A                                       C) 6 A
B) 4 A                                       D) 1 A

Q.4 What will be the effect on the capacitance of a capacitor if area of each plate is doubled while separation between the plates is halved?
A) Capacitance remains same                             C) Capacitance becomes four times
B) Capacitance becomes double                                     D) Capacitance reduces to half
Q.5 10 V potential difference is applied across the plate of 1 µF capacitor. What is the energy storied in capacitor?
A) 0.5 mJ                                              C) 5 mJ
B) 0.05 mJ                                            D) 50 mJ

Q.7 What is the charge stored on a 5 μF capacitor charged to potential difference of 12 V?
A) 60 μC                                               C) 2.4 μC
B) 2.4 C                                                            D) 60 C
Q.8 12­volt battery is applied across 6­ohm resistance to have a steady flow of current. What must be the required potential difference across the same resistance to have a steady current of one ampere?
A) 12 V                                                 C) 1 V
B) 6 V                                                   D) 3 V