Short Answer TypeState the ways by which the frequency of transverse vibrations of a stretch string can be increased?
The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B, represents the parallel combination? Give reasons for your answer.
The music system draws a current of 400 mA when connected to a 12 V
battery.
(i) What is the resistance of the music system?
(ii) The music system if left playing for several hours and finally the battery voltage drops to 320 mA and the music system stops playing when the current.
Calculate the quantity of heat produced in a 20 ohm resistor carrying 2.5 A current in 5 minutes.
An element 
decays to 
after emitting 2 
particles and 1 
particle. Find the atomic number and atomic mass of the element S.
A radioactive substance is oxidized. Will there be any change in the nature of its radioactivity? Give a reason for your answer?
State the characteristics required in a material to be used as an effective fuse wire.
Which coil of a step up transformer is a made thicker and why?
In a step-up transformer, the primary coil is made of thicker wire. This is because in a step-up transformer the number of turns in the primary coil.
As,
But, IS<IP, i.e., more current flows through the primary coil. Therefore, one must use a thicker wire in the primary coil as compared to that in the secondary coil.
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