Physics Past Questions and Answers

Four lenses are being considered for use as a microscope objective. Which of the following focal lengths is most suitable?

A -5mm
B +5mm
C -5cm
D +5cm

Question 452:

If the angle of declination in a place is 10oE, calculate the true geographic bearing if the compass reads N40oE

A N50oE
B N40oE
C N30oE
D N25oE

Question 453:

Two capacitance of 6\(\mu\)F and 8\(\mu\)F are connected in series. What additional capacitance must be connected in series with this combination to give a total of 3\(\mu\)F

A 3\(\mu\)F
B 16\(\mu\)F
C 24\(\mu\)F
D 30\(\mu\)F

Question 454:

When a transformer has more secondary windings than primary windings, it

A Has a smaller secondary current
B Has a greater power output
C Is a step-down transformer
D Increases the total energy output

Question 455:

A current of 0.5A flows through a resistor when connected to a 40-V battery. How much energy is dissipated in 2 minutes?

A 1200J
B 1500J
C 2400J
D 96000J