physics

The circuit contains three ammeters A1, A2 and A3 with readings of A2 and A3 shown as indicated in the diagram. Determine the reading of A1.

A. 2A B. 3A C. 5A D. 8A Correct Answer: Option B B. 3A Explanation Ammeters are connected in series…

6 years ago

Which of the following statements about parallel plate capacitors is/are correct?

I. Capacitance of the capacitor is inversely proportional to the distance between the plates II. Capacitors can filter a.c signals…

6 years ago

The diagram above illustrates the wire connections to a three-pin plug. The wires P, Q and R respectively are:

A. live, neutral and earth B. neutral, earth and live C. earth, live and neutral D. earth, neutral and live…

6 years ago

Which of the following statements is not an advantage of an alkaline accumulator?

A. The electrolyte does not need attention B. It can be recharged C. It has low internal resistance D. It…

6 years ago

A resistor with fixed resistance value is called a?

A. resistance box B. standard resistor C. shunt resistor D. multiplier resistor Correct Answer: Option B B. standard resistor

6 years ago

The diagram above illustrates a waveform. Determine the number of wavelengths in it?

A. 4 B. 3½ C. 2½ D. 2 Correct Answer: Option C C. 2½

6 years ago

A wire of length 400cm is stretched between two fixed points. When plucked, its fundamental frequency is 150Hz. Calculate the speed of the wave produced.

A. 250ms‾¹ B. 625ms‾¹ C. 1200ms‾¹ D. 1500ms‾¹ Correct Answer: Option C Explanation The fundamental frequency (f0) = v/2l f0=150Hz;…

6 years ago

When the speed of a car is halved, its kinetic energy is?

A. doubled B. quartered C. halved D. quadrupled Correct Answer: Option B B. quartered Explanation Given K1 = mv²/2. When…

6 years ago

In the diagram illustrated a block of mass M is at rest on a plane inclined at an angle θ to the horizontal. As θ increases, the velocity ratio of the plane

A. increases B. decreases C. remain the same D. decreases and later increases Correct Answer: Option B B. decreases Explanation…

6 years ago

The primary of a transformer has 100 turns and its secondary has 200 turns. If the voltage at the primary is 100V, determine the voltage at the secondary.

A. 50V B. 100V C. 200V D. 400V Correct Answer: Option C Explanation The ideal transformer (either step-up or step-down)…

6 years ago