Question 1 :
The period of oscillation of a bar magnet in a vibration magnetometer is 2 s. The period of oscillation of another bar magnet whose moment is 4 times that of 1st magnet is

Question 2 :
A magnetic needle is kept in a non-uniform magnetic field. It experiences

Question 6 :
All components of the Electromagnetic Spectrum in vacuum have the same

Question 7 :
In an Electromagnetic Wave, direction of propagation is in the direction of

Question 8 :
Out of the following options which one can be used to produce a propagating electromagnetic wave?

Question 9 :
The magnetic field in a travelling electromagnetic wave has a peak value of 20{tex} \mathrm { nT } {/tex} . The peak value of electric field strength

Question 10 :
If {tex} v _ { s } , v _ { x } {/tex} and {tex} v _ { m } {/tex} are the speed of soft gamma rays, X-rays and microwaves respectively in vacuum, then

Question 12 :
A laser beam is sent to the moon and reflected back to earth by ay mirror placed on the moon by an astronaut. If the moon is 38400 km from earth, how long does it take the light to make the round trip?

Question 13 :
Two inductors of inductance <img style='object-fit:contain' width=8 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea2a1198ab67a08eba56172"> each are connected in series with opposite magnetic fluxes. What is the resultant inductance? (Ignore mutual inductance)

Question 14 :
A coil of wire of certain radius has 100 turns and a self inductance of 15 mH. The self inductance of a second similar coil of 500 turns will be

Question 15 :
The magnetic flux linked with the coil varies with time as <img style='object-fit:contain' width='111' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea289523c680714de9a8438"> the magnitude of the induced emf at 2 s is

Question 16 :
If a current of 3 A flowing in the primary coil is reduced to zero in 0.001 s, the induced emf in between the two coils is 15000 V, the coefficient of mutual induction is

Question 17 :
Energy required to establish a current of 4 A in a coil of self-inductance <i>L </i>=200mH is

Question 18 :
If the charge on a capacitor is increased by 2 coulomb, the energy stored in it increase by 21%. The original charge on the capacitor is

Question 20 :
Two charge {tex} q {/tex} and {tex} - 3 q {/tex} are placed fixed on {tex} x {/tex} -axis separated by distance {tex} d . {/tex} Where should a third charge 2{tex} q {/tex} be placed such that it will not experience any force?<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5d5fcdb7d3eb695bc07eb3b6"><br>

Question 21 :
There is an electric field {tex} \mathrm { E } {/tex} in {tex} \mathrm { x } {/tex} -direction. If the work done on moving a charge of 0.2{tex} \mathrm { C } {/tex} through a distance of 2{tex} \mathrm { m } {/tex} along a line making an angle {tex} 60 ^ { \circ } {/tex} with {tex} \mathrm { x } {/tex} -axis is 4{tex} \mathrm { J } {/tex} , then what is the value of {tex} \mathrm { E } ? {/tex}

Question 22 :
If a unit positive charge is taken from one point to another over an equipotential surface, then

Question 23 :
In the figure, a proton moves a distance <img style='object-fit:contain' width=9 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea183b31ac76a0b860fd580"> in a uniform electric field <img style='object-fit:contain' width=10 height=22 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea183c21ac76a0b860fd5fb"> as shown in the figure. Does the electric field do a positive or negative work on the proton? Does the electric potential energy of the proton increase or decrease<br> <img style='object-fit:contain' width=97 height=71 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea185d41ac76a0b860fe102">

Question 24 :
In bringing an electron towards another electron, the electrostatic potential energy of the system

Question 25 :
A charge <img style='object-fit:contain' width=10 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea1838a1ac76a0b860fd4b6"> is enclosed by a Gaussian spherical surface of radius <img style='object-fit:contain' width=13 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea183b81ac76a0b860fd5a6"> If the radius is doubled, then the outward electric flux will

Question 26 :
Eight drops of mercury of equal radii possessing equal charges combine to form a big drop. Then the capacitance of bigger drop compared to each individual small drop is

Question 27 :
A metallic solid sphere is placed in a uniform electric field. The lines of force follow the path(s) shown in figure as<br> <img style='object-fit:contain' width=179 height=92 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea1851c1ac76a0b860fdc83">

Question 28 :
A particle of mass {tex} m {/tex} and charge {tex} q {/tex} is placed at rest in a uniform electric field {tex} E {/tex} and then released. The kinetic energy attained by the particle after moving a distance {tex} y {/tex} is

Question 29 :
In a given network the equivalent capacitance between {tex} A {/tex} and {tex} B {/tex} is {tex} \left[ C _ { 1 } = C _ { 4 } = \right. {/tex} {tex} \left. 1 \mu F , C _ { 2 } = C _ { 3 } = 2 \mu F \right] {/tex}<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5d5fceafe5db655bbf10a226"><br>

Question 30 :
The resistance of the coil of an ammeter is {tex} R {/tex} . The shunt required to increase its range {tex} n {/tex} -fold should have a resistance

Question 31 :
In a neon gas discharge tube Ne' ions moving through a cross-section of the tube each second to the right is {tex} 2.9 \times {/tex} {tex} 10 ^ { 18 } {/tex} , while {tex} 1.2 \times 10 ^ { 18 } {/tex} electrons move towards left in the same time; the electronic charge being {tex} 1.6 \times 10 ^ { - 19 } \mathrm { C } , {/tex} the net electric current is

Question 33 :
What is the p.d between the terminals A and B?&nbsp;<br /><img style='object-fit:contain' class="uploaded-image" src="https://storage.googleapis.com/teachmint/question_assets/NEET/5fb636e0608a44687cdd323b" />

Question 34 :
In a large building, there are 15 bulbs of {tex} 40 \mathrm { W } , 5 {/tex} bulbs of 100 {tex} \mathrm { W } , 5 {/tex} fans of 80{tex} \mathrm { W } {/tex} and 1 heater of 1{tex} \mathrm { kW } {/tex} . The voltage of electric mains is 220{tex} \mathrm { V } {/tex} . The minimum capacity of the main fuse of the building will be:

Question 35 :
When 5{tex} \mathrm { V } {/tex} potential difference is applied across a wire of length 0.1{tex} \mathrm { m } {/tex} , the drift speed of electrons is {tex} 2.5 \times 10 ^ { - 4 } \mathrm { ms } ^ { - 1 } {/tex} . If the electron density in the wire is {tex} 8 \times 10 ^ { 28 } \mathrm { m } ^ { - 3 } , {/tex} the resistivity of the material is close to:

Question 36 :
A battery is charged at a potential of 15{tex} \mathrm { V } {/tex} for 8 hours when the current flowing is 10{tex} \mathrm { A } {/tex} . The battery on discharge supplies a current of 5{tex} \mathrm { A } {/tex} for 15 hours. The mean terminal voltage during discharge is 14{tex} \mathrm { V } {/tex} . The "watt-hour" efficiency of the battery is

Question 37 :
When 1 g hydrogen (e.c.e. = 1.044 × 10^–8 kg/C) forms water, 34 kcal heat is liberated. The minimum voltage required to decompose water is

Question 38 :
In a meter bridge experiment null point is obtained at {tex} 20 \mathrm { cm } , {/tex} from one end of the wire when resistance {tex} X {/tex} is balanced against another resistance {tex} Y . {/tex} If {tex} X < Y {/tex} , then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4{tex} X {/tex} against {tex} Y {/tex}

Question 39 :
Two resistance filaments of same length are connected first in series and then in parallel. Find the ratio of power dissipated in both cases assuming that equal current flows in the main circuit.

Question 40 :
Two cells having e.m.f. 4V, 2V and internal resistances 1 Ω, 1 Ω are connected as shown in figure. Current through 6 Ω resistance is <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/NEET/5bad8697db1af5706f16fa25'>

Question 41 :
An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii are in the ratio of {tex} \frac { 4 } { 3 } {/tex} and {tex} \frac { 2 } { 3 } , {/tex} then the ratio of the current passing through the wires will be

Question 42 :
You are given a resistance coil and a battery. In which of the following cases the largest amount of heat generated?

Question 43 :
Potentiometer wire of length 1 m is connected in series with 490{tex}\Omega{/tex} resistance and 2 V battery. If 0.2 mV/cm is the potential gradient, then resistance of the potentiometer wire is

Question 44 :
A wire X is half the diameter and half the length of a wire Y of similar material. The ratio of resistance of X to that of Y is

Question 45 :
When a current , is set up in a wire of radius r, the drift velocity is v{tex}_d{/tex}. If the same current is set up through a wire of radius 2 r, the drift velocity will be

Question 46 :
<strong>Assertion:</strong>Kirchoff&rsquo;s juction rule can be applied to a junction of several lines or a point in a line. <br /><strong>Reason:</strong>When steady current is flowing, there is no accumulation of charges at any junction or at any point in a line.

Question 47 :
When the current i is flowing through a condutor, the drift velocity is v. If 2i current flows through the same metal but having double the are of cross-section, then the drift velocity will be