Physics Past Questions and Answers

Which of the following sets of coloured light is/are secondary colours i. Red, Blue and green ii. Blue, cyan and magneta iii. Green, Magenta and yellow, IV Yellow, Cyan and Magenta

A I and ii only
B Ii and iii only
C Iv only
D I, ii and iv only

Question 3687:

When two like charges are brought together, the potential energy of the system formed will

A Increase because work is done against the field
B Increase because work is done by the field
C Decrease because work is done by the field
D Decrease because work is done against the field

Question 3688:

Two capacitors, each of capacitance 2\(\mu\)F are connected in parallel. If the p.d across them is 120V, calculate the charge on each capacitor

A 6.0 x 10-5C
B 1.2 x 10-4C
C 2.4 x 10-4C
D 4.8 x 10-4C

Question 3689:

Which of the following properties is an advantage of lead-acid accumulator over an alkaline accumulator?

A Possesses low internal resistance
B Can be recharges
C Has shorter life span
D Possesses high e.m.f

Question 3690:

Six dry cells each of e.m.f. 2.0 and internal resistance of 1.0\(\Omega\) are connected in parallel across a load of 3.0\(\Omega\). Calculate the effective current in the circuit.

A 0.63A
B 0.50A
C 0.31A
D 0.22A