1.
Charge is the property associated with matter due to which it produces and experiences
3.
A body is positively charged, it implies that
4.
On rubbing, when one body gets positively charged and other negatively charged, the electrons transferred from positively charged body to negatively charged body are
5.
Which of the following is the best insulator?
6.
If a body is negatively charged, then it has
7.
When a body is charged by induction, then the body
8.
On charging by conduction, mass of a body may
9.
Quantisation of charge implies
10.
A positively charged particle is released from rest in an uniform electric field. The electric potential energy of the charge
11.
Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately
12.
Two small spheres each carrying a charge q are placed r metre apart. If one of the spheres is taken around the other one in a circular path of radius r, the work done will be equal to
13.
If a unit positive charge is taken from one point to another over an equipotential surface, then
14.
A capacitor is charged by using a battery which is then disconnected. A dielectric slab then slipped between the plates, which results in
15.
Which of the following statement is true?
16.
Consider a uniform electric field in the z-direction. The potential is a constant
18.
In a region of constant potential
19.
A test charge is moved from lower potential point to a higher potential point. The potential energy of test charge will
20.
An electric dipole of moment is placed in a uniform electric field . Then
(i) the torque on the dipole is
(ii) the potential energy of the system is
(iii) the resultant force on the dipole is zero. Choose the correct option.
21.
21. If a conductor has a potential V ≠ 0 and there are no charges anywhere else outside, then
22.
Which of the following statements is false for a perfect conductor?
23.
Dielectric constant for a metal is
24.
When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges separated by a distance
25.
In a parallel plate capacitor, the capacity increases if
26.
A parallel plate air capacitor is charged to a potential difference of V volts. After disconnecting the charging battery the distance between the plates of the capacitor is increased using an insulating handle. As a result the potential difference between the plates
27.
Two identical capacitors are joined in parallel, charged to a potential V, separated and then connected in series, the positive plate of one is connected to the negative of the other. Which of the following is true?
28.
A capacitor has some dielectric between its plates, and the capacitor is connected to a dc source. The battery is now disconnected and then the dielectric is removed, then
29.
Two spherical conductors each of capacity C are charged to potential V and -V. These are then connected by means of a fine wire. The loss of energy is
30.
In a current carrying conductor the net charge is
31.
The current which is assumed to be flowing in a circuit from positive terminal to negative, is called
32.
When no current is passed through a conductor,
33.
A current passes through a wire of nonuniform cross-section. Which of the following quantities are independent of the cross-section?
34.
In the equation AB = C, A is the current density, C is the electric field, Then B is
35.
Drift velocity of electrons is due to
36.
The speed at which the current travels, in conductor, is nearly equal to
37.
In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is
38.
When a potential difference V is applied across a conductor at a temperature T, the drift velocity of electrons is proportional to
39.
For which of the following dependence of drift velocity vd on electric field E, is Ohm’s law obeyed?
40.
The current density (number of free electrons per m3) in metallic conductor is of the order of
41.
A current passes through a resistor. If K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions respectively then
42.
Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called
43.
In electromagnetic induction, the induced charge is independent of
44.
An induced e.m.f. is produced when a magnet is plunged into a coil. The strength of the induced e.m.f. is independent of
45.
According to Faraday’s law of electromagnetic induction
46.
A moving conductor coil produces an induced e.m.f. This is in accordance with
47.
A coil of insulated wire is connected to a battery. If it is taken to galvanometer, its pointer is deflected, because
48.
The polarity of induced emf is given by
49.
The self inductance of a coil is a measure of
50.
The coils in resistance boxes are made from doubled insulated wire to nullify the effect of
51.
Lenz’s law is a consequence of the law of conservation of
52.
Two pure inductors each of self inductance L are connected in series, the net inductance is
53.
A magnet is moved towards a coil (i) quickly (ii) slowly, then the induced e.m.f. is
54.
The laws of electromagnetic induction have been used in the construction of a
55.
In general in an alternating current circuit
56.
The frequency of A.C. mains in India is
57.
A.C. power is transmitted from a power house at a high voltage as
58.
Alternating currents can be produced by a
59.
The peak value of the a.c. current flowing throw a resistor is given by
60.
The alternating current can be measured with the help of
61.
Alternating current can not be measured by D.C. ammeter, because
62.
The heat produced in a given resistance in a given time by the sinusoidal current I0sinωt will be the same as that of a steady current of magnitude nearly
63.
An A.C. source is connected to a resistive circuit. Which of the following is true?
64.
In which of the following circuits the maximum power dissipation is observed?
65.
With increase in frequency of an A.C. supply, the inductive reactance
66.
If the frequency of an A.C. is made 4 times of its initial value, the inductive reactance will
67.
In electromagnetic waves the phase difference between electric and magnetic field vectors are
68.
Which of the following has minimum wavelength?
69.
The correct option, if speeds of gamma rays, X-rays and microwave are Vg, Vx an Vm respectively will be.
70.
Which of the following has maximum penetrating power?
71.
Electromagnetic waves travelling in a medium having relative permeability μr = 1.3 and relative permittivity Er = 2.14. The speed of electromagnetic waves in medium must be
72.
Which of the following is called heat radiation?
73.
From Maxwell’s hypothesis, a charging electric field gives rise to
74.
The ultra high frequency band of radio waves in electromagnetic wave is used as in
75.
Electromagnetic waves are transverse in nature is evident by
76.
For a total internal reflection, which of the following is correct?
77.
Mirage is a phenomenon due to
78.
Critical angle of glass is θ2 and that of water is θ2. The critical angle for water and glass surface would be (μg = 3/2, μw = 4/3)
79.
An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. Then
80.
A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
81.
Which of the following forms a virtual and erect image for all positions of the object?
82.
Two lenses of focal lengths 20 cm and – 40 cm are held in contact. The image of an object at infinity will be formed by the combination at
83.
Two beams of red and violet color are made to pass separately through a prism (angle of the prism is 60°). In the position of minimum deviation, the angle of refraction will be
84.
An under-water swimmer cannot see very clearly even in absolutely clear water because of
85.
A person is six feet tall. How tall must a plane mirror be if he is able to see his entire length?
86.
The image formed by a concave mirror is
87.
When light is refracted into a medium,
88.
Which of the following phenomena is used in optical fibres ?
89.
Critical angle of light passing from glass to water is minimum for
90.
If a glass prism is dipped in water, its dispersive power
91.
The objective of a telescope must be of large diameter in order to
92.
The device which produces highly coherent sources is
93.
Which of the following, cannot produce two coherent sources?
94.
Coherence is a measure of
95.
Two sources of light are said to be coherent, when they give light waves of same
96.
Intensity of light depends on
97.
The colour of bright fringe nearest to central achromatic fringe in the interference pattern with white light will be
98.
The correct formula for fringe visibility is
99.
Laser light is considered to be coherent because it consists of
100.
The interfering fringes formed by a thin oil film on water are seen in yellow light of sodium lamp. We find the fringes
