Current Electricity - MCQs

Current Electricity - MCQs Points : Current Electricity, mcqs, Current Electricity fill in the blanks, mechanics objective type questions 1. The specific resistance of all metals is most affected by
(a) applied magnetic field
(b) illumination
(c) pressure
(d) temperature

2. Through a metallic conductor an electric current is passed due to the drift of
(a) protons
(b) neutrons
(c) +ve ions
(d) free electrons

3. Through an electrolyte an electric current is passed due to the drift of
(a) protons
(b) free electrons
(c) + ye and -ye ions
(d) free electrons and holes

Electrostatics - MCQs

Electrostatics - MCQs Points : Electrostatics, - mcqs, Heat and Thermodynamics fill in the blanks, mechanics objective type questions 1. Objects may acquire an excess or deficiency of free electrons by
(a) grinding
(b) shielding
(c) grounding
(d) rubbing

2. The electric charge in uniform motion produces
(a) both electric and magnetic fields
(b) neither electric nor magnetic field
(c) a magnetic field only
(d) an electric field only

3. Which of the following is a semi-conductor?
(a) Gold
(b) Aluminum
(c) Germanium
(d) Glass

Optics - MCQs

Optics - MCQs Points : optics mcqs, optics fill in the blanks, optics objective type questions 1. A lamp is hanging at a height 40 cm from the centre of a table. If its height is increased by 10 cm the illuminance on the table will decrease by
(a) 10%
(b) 20%
(c) 27%
(d) 36%

2. Inverse square law for illuminance is valid for
(a) isotropic point source
(b) acylindrical source
(c) a search light
(d) all types of sources

3. In a movie hail, the distance between the projector and the screen is increased by 1%. The illumination on the screen is
(a) increased by 1%
(b) descreased by 1%
(c) increased by 2%
(d) decreased by 2%

Sound - MCQs

Sound - MCQs Points :sound mcqs, mechanics fill in the blanks, mechanics objective type questions 1. It is possible to distinguish between transverse and longitudinal waves by studying the property of
(a) interference
(b) diffraction
(c) reflection
(d) polarization

2. In a mechanical transverse wave, the particles of the medium
(a) vibrate in a direction perpendicular to the direction of propagation
(b) vibrate in a direction parallel to the direction of propagation
(c) move in circles
(d) move in ellipses

3. When a sound wave goes from one medium to another, the quantity that remains unchanged is
(a) speed
(b) amplitude
(c) frequency
(d) wavelength

Heat and Thermodynamics - MCQs

Heat and Thermodynamics - MCQs Points : Heat and Thermodynamics - mcqs, Heat and Thermodynamics fill in the blanks, mechanics objective type questions 1. Temperature of a block of iron is 140°F. Its temperature on the celsius scale will be
(a) 20°
(b) 40°
(c) 60°
(d) 80°

2. In the equation PV=RT, V stands for the volume of
(a) 1 litre of gas
(b) one gram of gas
(c) any amount of gas
(d) one gm molecules of a gas

3. Ttemperature at which centigrade and Farenheit scales give the similar reading is
(a) 128°C
(b) 32° F
(c) -40°C
(d) -108°C

Mechanics - MCQs

Mechanics - MCQs Points : mechanics - mcqs, mechanics fill in the blanks, mechanics objective type questions 1. Plank’s constant has the dimensions of
(a) energy
(b) work
(c) linear momentum
(d) angular momentum

2. The unit of power is
(a) kilowatt
(b) kilowatt-hour
(c) dyne
(d) joule

3. In the S.I. system, the unit of temperature is
(a) degrees centigrade
(b) kelvin
(c) degrees celsius
(d) degrees fahrenheit

Protection of Power System - Multiple Choice Question

Protection of Power System - Multiple Choice Question Points : protection of power system multiple choice questions and answers, electrical objective type question answers, mcqs, protection of power system blanks 1. Overheating of a transformer may be due to
(i) overloads
(ii) short-circuits
(iii) failure of cooling system
(iv) all above

2. In an alternator, relay protection is absolutely necessary against
(i) over current
(ii) field failure
(iii) stator winding faults
(iv) none of above

3. When failure of prime-mover takes place3 the alternator
(i) runs as a synchronous motor
(ii) draws some current from the supply
(iii) is in the inverted running mode
(iv) all above

Switchgear - Multiple Choice Questions

Switchgear - Multiple Choice Questions Points : switchgear blanks, switchgear multiple choice questions and answers, electrical objective type question answers, mcqs 1. A circuit breaker performs the function of
(i) detection only
(ii) circuit interruption only
(iii) both detection and circuit interruption
(iv) none of above

2. An arc is produced when the switch of a high-voltage and large-current circuit is
(i) opened
(ii) closed
(iii) opened or closed
(iv) none of above

3. A fuse performs
(i) detection function only
(ii) circuit interruption function only
(iii) both detection and interruption functions
(iv) none of above