| Question 1: Who first explained electromagnetic waves mathematically ? |
Maxwell |
| Question 2: Which factor of the following does not affect resistance of a conducting wire ? |
Voltage applied |
| Question 3: When a dielectric is placed in an external electric field, the effective electric field inside the dielectric |
decreases |
| Question 4: A capacitor of capacitance 1 µF is kept at 1V potential difference between the plates. The charge on the charged capacitor will be |
1µC |
| Question 5: If a charged particle of mass m and charge q enters a uniform magnetic field B.... |
mvSinθ/qB |
| Question 6: An ideal ammeter has |
zero resistance |
| Question 7: Remote controller in TV uses... |
infrared waves |
| Question 8: The equivalent resistance of resistors in parallel combination |
decreases |
| Question 9: The magnetic field lines inside a current-carrying solenoid are |
parallel and straight |
| Question 10: Coherent sources are those sources for which |
both phase difference and frequency remain constant |
| Question 11: Natural light from the sun is |
unpolarised |
| Question 12: Radioactivity was discovered by |
Henri Becquerel |
| Question 13: The example of a broadcast mode of communication is |
Both A and C |
| Question 14: Which device is used as a voltage regulator ? |
Zener Diode |
| Question 15: world wide web was invented by... |
Tim Barner-Lee |
| Question 16: Electrical energy representation |
V.I.t |
| Question 17: When an alpha-particle is brought towards another alpha-particle, the potential energy of the system |
increased |
| Question 18: Dielectric constant of water is... |
80 |
| Question 19: The relationship between current density J and electric field intensity E is |
Option D |
| Question 20: The yellow colour code value of carbon resistance is |
4 |
| Question 21: Relative permeability is equal to |
Option B |
| Question 22: When an electric dipole p. is placed in a uniform electric field E.... |
90 |
| Question 23: A circular loop radius R carries a current I. Its magnetic dipole |
Option D |
| Question 24: When the tube length of microscope is increased, its magnifying power |
increases |
| Question 25: Cathode rays are the group of.... |
electrons |
| Question 26: When a soap bubble is charged, then its size |
increases |
| Question 27: If the area of plates of a capacitor is halved, then the capacitance will |
become half |
| Question 28: Choke coil works on the principle of |
transient current |
| Question 29: The dimensions of B/µ.... |
energy density |
| Question 30: Nickel is.. |
ferromagnetic |
| Question 31: In a half-wave rectifier, if the input frequency is 50 Hz, then output frequency will be |
50 Hz |
| Question 32: How many joules of energy will be released due to mass defect of 1 mg ? |
Option C |
| Question 33: The ratio of de Broglie wavelength associated with two electrons accelerated through 49 V and 64 V is |
8/7 |
| Question 34: A ray of light is incident normally on a plane mirror... |
0 degree |
| Question 35: The phase difference φ is related to path difference by λ |
Option B |
| Question 36: To remove hypermetropia, lens used is |
convex |
| Question 37: Inverse square law of intensity of light, i.e., intensity.... |
point source |
| Question 38: The kinetic energy ( K) of an electron in a Bohr orbit.... |
K=-U/2 |
| Question 39: Semiconductor is damaged by the strong current due to.. |
excess of electrons |
| Question 40: The valency of impurity element to convert a germanium crystal... |
3 |
| Question 41: In a communication system, a repeater is |
a combination of a receiver and transmitter |
| Question 42: The maximum velocity of an electron emitted from a metal surface... |
2hv/3 |
| Question 43: If a bar magnet is cut into two equal pieces transverse to its length, then each piece will |
behave as a new magnet with reduced magnetie moment |
| Question 44: In an ac circuit of capacitance the current from difference is |
forward |
| Question 45: A capacitor is a perfect insulator for |
direct currents |
| Question 46: The unit displacement of current is |
A |
| Question 47: solar spectrum is... |
continuous |
| Question 48: the field of view is maximum for... |
convex mirror |
| Question 49: The ratio of the refractive index of red light to blue light in |
less than unity |
| Question 50: The nuclear density is approximately |
independent of mass number |
| Question 51: in a trasistor.. |
concentration of impurities in the base is minimum |
| Question 52: Coulomb's law is valid for |
Point charges only |
| Question 53: SI Unit of electric flux is... |
Vm |
Question 54: A cell of internal resistance ris connected to an external resistance
R. The current will be maximum in R, if |
R=r |
| Question 55: If L and R represent inductance and resistance respectively.... |
second |
| Question 56: In a metallic conductor, the current is carried by |
free electrons |
| Question 57: The surface charge densities on the surface of two... |
1:1 |
| Question 58: Ohm's law does not apply when... |
temparature changes |
| Question 59: An example of natural electromagnetic induction is |
lightning strike |
| Question 60: Which quantity decreases in step-down transformer ? |
Voltage |
| Question 61: The refractive index of water is 1.33... |
Option C |
| Question 62: The maximum kinetic energy of the photoelectrons varies |
linearly with the frequency and is independent of the intensity of the incident radiation |
| Question 63: Which of the following are known as nucleons ? |
protons and neutrons |
| Question 64: The momentum ( p) of photon is |
Option A |
| Question 65: The radius of the lowest Bohr's orbit in hydrogen... |
4r0 |
| Question 66: If magnetic field is same but the area of the loop is increased, then the flux |
increases |
| Question 67: The voltage of domestic ac is 220 V. What does this represent ? |
Root mean square voltage |
| Question 68: The wavefront due to a point source at a finite distance from the source is |
spherical |
| Question 69: For destructive interference, the path difference should be equal to |
Option B |
| Question 70: In an electric field of intensity E = O, the potential V will vary with distance r. |
Option D |
POST YOUR COMMENT