Physics
The graph of voltage vs current for four different materials is shown below.
Which of these four materials would be used for making filament of a bulb?
- Q
- S
- P
- R
Current Electricity
2 Likes
Answer
P
Reason — The filament of a bulb should produce a high heating effect so its resistance should be high. From the graph, slope of line for substance P is the greatest hence, resistance of P is highest. So, substance P is most suitable for making the filament of a bulb.
Answered By
3 Likes
Related Questions
Assertion (A) : Infrared radiations travel long distance through a dense fog and mist.
Reason (R) : Infrared radiations undergo minimal scattering in earth's atmosphere.
- both A and R are true and R is the correct explanation of A.
- both A and R are True and R is not the correct explanation of А.
- assertion is false but reason is true.
- assertion is true but reason is false.
Two sound waves X and Y have the same amplitude and the same wave pattern but their frequencies are 60 Hz and 120 Hz respectively, then
- X will be shriller and Y will be grave
- X will be grave and Y will be shriller
- X will differ in quality than Y
- X is louder than Y
According to the old convention, the colour of the earth wire is :
- black
- green
- yellow
- red
Current is flowing through a coil as shown in the figure. Which one of the given figures will correctly depict the magnetic polarity and the direction of the lines of force along the axis of the coil.
- 1.
- 2.
- 3.
- 4.
