Question 1 :
A $10\ m$ long potentiometer wire is connected to a battery having a steady voltage. A Leclanche cell is balanced at $4\ m$ length of the wire. If the length is kept the same, but its cross-section is doubled, the null point will be obtained at:
Question 2 :
In general, when the temperature of a conductor increases, its resistance
Question 6 :
A capacitor of capacity C$_{1}$ charged up to V volt and then connected to an uncharged capacitor C$_{2}$.Then final P.D. across each will be:
Question 7 :
A capacitor consists of two metal plates each$10{\text{ }}cm$ by$20{\text{ }}cm;$ they are separated by a$2.0{\text{ }}mm$ thick insulator with dielectric constant$4.1$ and dielectric strength 6.0107 V/m. What is the capacitance in$pF\left( {{{10}^{ - 12}}F} \right)?$<br>
Question 8 :
<span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">A charge $‘Q’$ is placed at each corner of a cube of side $‘a’$. The potential at the centre of the cube is :</p>
Question 9 :
If $C$ is the value of the capacitance of a capacitor filled with a given dielectric and $a$ is the capacitance of an identical capacitor in a vacuum, the dielectric constant, symbolized by the Greek letter kappa, , is simply expressed as
Question 10 :
In a moving cell galvanometer, we use a radial magnetic field so that the galvanometer scale is<br>
Question 12 :
Two beams of protons moving parallel in same direction will :
Question 14 :
Assertion: The coil is bound over the metallic frame in moving coil galvanometer.
Reason: The metallic frame helps in making steady deflection without any oscillation.
Question 15 :
State whether true or false :<br>An electromagnet requires a continuous supply of current to maintain the magnetic field.
Question 16 :
For protecting a sensitive equipment from external magnetic field, it should be
Question 18 :
A beam of light is incident on a liquid of refractive index 1.40. The reflected rays are completely polarized. The angle of refraction of the beam is ($\tan 54.5^{\circ}=1.4$):<br/>
Question 20 :
If a photon has velocity $c$ and frequency $v$, then which of the following represents its wavelength
Question 21 :
The effective mass of photon in microwave region, visible region and x -ray region is in the following order:<br>
Question 22 :
Among the following, identify one that is antiparticle of itself :<br>
Question 24 :
Which one of the following properties is not found in cathode rays ?
Question 26 :
Which of the following pair below represents isotopes of the same element?
Question 28 :
An atom contains 12 protons, 12 electrons, and 13 neutrons.<br>Which of the following combinations of particles is an isotope of that atom?<br>
Question 29 :
Isotopes of same element exists in nature.How they differ from each other ? <br/>
Question 30 :
Determine the number of neutrons in an isotope of 'H' (mass no. 3).