Question 3 :
Current in a circuit flows in which of the following directions listed below:
Question 4 :
In a metallic conductor, electric current is thought to be due to movement of :
Question 6 :
A bar magnet is rubbed on a bar of steel along its length 20 times. The bar of steel gets magnetised due to the process of :
Question 10 :
The place around a magnet where its influence can be detected is called :
Question 12 :
Assuming that the charges of an electron is {tex}1.6 × 10^{-19}{/tex}coulombs, the number of electrons passing through a section of wire per sec, when the wire carries a current of one ampere is :
Question 16 :
The insulator of electricity is which of the following materials listed below:
Question 17 :
On increasing the resistance in a circuit, the current in it
Question 20 :
Calculate the total number of electrons flowing through a circuit in {tex} 20 \mathrm{mins} {/tex} and {tex} 40 \mathrm{~s} {/tex} if a current of 40{tex}\mu A{/tex} flows through the circuit.<br />({tex} 1 \mathrm{e}^{-}=1.6 \times 10^{-19} \mathrm{C}{/tex})
Question 25 :
In case of longitudinal waves, the particles of the medium vibrate :
Question 26 :
The number of oscillations passing through a point in unit time is called :
Question 27 :
If the speed of {tex} \operatorname { cog } {/tex} wheel is halved , bass note is produced
Question 33 :
If the frequency of a wave is 25 Hz. the total number of compressions and rarefactions passing through a point in 1 second is :
Question 36 :
In the region of compression or rarefaction, in a longitudinal wave, the physical quantity which does not change is :
Question 39 :
A part of longitudinal wave in which particles of the medium are farther away than the normal particles is called :
Question 40 :
A bat emits an ultrasonic sound of frequency 0.25 MHz. Calculate the time in which one vibration is completed.
Question 41 :
A part of the longitudinal wave in which particles of the medium are closer than the normal particles is called :