Physics Past Questions and Answers

In the diagram above, a bulb is lit by drawing 2.0A from 440V a.c. source. Calculate the cost of keeping the bulb on for two days at $0.40 per kilowatt-hour .

A $16.90
B $84.48
C $1690.00
D $8.48

Question 2037:

Which of the following actions will increase capacitance of a parallel plate capacitor?
I. Decreasing the distance between the plates
II. Increasing the distance between the plates.
III. Increasing the area of the plates overlap.
IV. Avoiding the use of dielectric between the plate

A I and III only
B II and III only
C I and IV
D . III and IV only

Question 2038:

A metallic sphere is heated from 27°C to 200°C Without change of state. Which of the following changes would have resulted from the heating?

A No changes occur in its volume and density
B Its volume increases and its density increases
C Its volume increases and its density decrease
D Its volume increases without a change in density

Question 2039:

The acceleration of a moving object can be determined from the?

A Slope of its distance-time graph.
B Area under its distance-time graph.
C Slope of its velocity-time graph.
D Area under its velocity-time graph

Question 2040:

A student wishes to measure the potential difference across a resistor,R. She has a galvanometer,G and some connecting wires.
What else does she need?

A High value resistor connected in parallel with G
B . low value resistor connected in parallel with G low value
C Resistor connected in series with G
D High value resistor connected in series with G.