Physics Past Questions and Answers

A simple cell with mercury-amalgamated zinc electrode prevents

A Local actions
B Polarization
C Buckling
D Degradation

Question 742:

The terminal voltage of a battery is 4.0V when supplying a current of 2.0A, and 2.0V when supplying a current of 3.0A. The internal resistance of the battery is

A 0.5 \(\Omega\)
B 1.0\(\Omega\)
C 2.0\(\Omega\)
D 4.0\(\Omega\)

Question 743:

A current of 100mA passes through a conductor for 2 minutes. The quantity of electricity transported is

A 200C
B 50C
C 12C
D 0.002C

Question 744:

A parallel plate capacitor of area 10cm² in vacuum has a capacitance of 10^-2\(\mu\)F. What is the distance between the plates?(e[sub][/sub] = 9 x 10^-12fm)

A 9 x 10^-13m
B 9 x 10^-7m
C 9 x 10^-3m
D 9 x 10⁷m

Question 745:

A 40-W instrument has a resistance of 90\(\Omega\). On what voltage should it be operated normally?

A 60V
B 150V
C 225V
D 3600V