MCQOPTIONS
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MCQOPTIONS
This section includes 286 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering materials knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
A crystalline solid has all similar atoms relative to neighbouring atoms in: |
| A. | periodical positions |
| B. | reversed positions |
| C. | random fluctuating position |
| D. | similar positions |
| Answer» E. | |
| 252. |
The [110] direction in a cubic unit cell is parallel to: |
| A. | face diagonal of unit cell |
| B. | edge of the cube |
| C. | body diagonal of the cube |
| D. | none of the above |
| Answer» C. body diagonal of the cube | |
| 253. |
Heating in microwave oven is due to: |
| A. | magnetostriction |
| B. | electrostriction |
| C. | eddy current |
| D. | Spontaneous polarization |
| Answer» D. Spontaneous polarization | |
| 254. |
The Miller indices of a plane are proportional to: |
| A. | the reciprocal of numerical parameters of the intercepts |
| B. | the square of unit cell dimensions |
| C. | the intercepts of the planes on the coordinate axes |
| D. | interplanar spacing |
| Answer» B. the square of unit cell dimensions | |
| 255. |
Line insulators are made of: |
| A. | porcelain |
| B. | mica |
| C. | marble |
| D. | PVC |
| Answer» B. mica | |
| 256. |
A primitive cell is: |
| A. | the cell containing smallest group of atoms randomly |
| B. | an unit cell in which lattice points are located only at its corners |
| C. | a basic building block of a crystal |
| D. | an unit cell of end centred monoclinic crystal |
| Answer» C. a basic building block of a crystal | |
| 257. |
At 0 K, an extrinsic semiconductor behaves like a: |
| A. | perfect insulator |
| B. | good conductor |
| C. | superconductor |
| D. | metal |
| Answer» B. good conductor | |
| 258. |
The value of wave number may be: |
| A. | zero |
| B. | positive |
| C. | negative |
| D. | all of the these |
| Answer» E. | |
| 259. |
Two important semiconductors Ge and Si have: |
| A. | 4 valence electrons |
| B. | 3 valence electrons |
| C. | 1 valence electron |
| D. | 5 valence electrons |
| Answer» B. 3 valence electrons | |
| 260. |
In a photostat machine, the drum is made of: |
| A. | salenium coating |
| B. | silicon coating |
| C. | cadmium coating |
| D. | zircon coating |
| Answer» B. silicon coating | |
| 261. |
Which of the following is not an example of electrical engineering material? |
| A. | Superconductor |
| B. | Mica and ferrite |
| C. | Cernet |
| D. | Aluminium doped silicon |
| Answer» D. Aluminium doped silicon | |
| 262. |
A semiconductor is electrically neutral because it has: |
| A. | no majority carriers |
| B. | no minority carriers |
| C. | no free carriers |
| D. | equal positive and negative carriers |
| Answer» E. | |
| 263. |
Amorphous structure is observed in: |
| A. | manganese |
| B. | glass |
| C. | quartz |
| D. | nickel |
| Answer» C. quartz | |
| 264. |
Bond length in ionic bond is of the order of: |
| A. | 1 to 2 |
| B. | 3 to 4 |
| C. | 5 to 6 |
| D. | 7 to 8 |
| Answer» B. 3 to 4 | |
| 265. |
A material is most stable when its potential energy is: |
| A. | maximum |
| B. | infinite |
| C. | minimum |
| D. | zero |
| Answer» D. zero | |
| 266. |
Bond formation in dry ice (solid CO |
| A. | Vander Waals force |
| B. | Electrostatic force |
| C. | Newton s force |
| D. | Hydrogen bond |
| Answer» B. Electrostatic force | |
| 267. |
Which of the following pair does not match? |
| A. | Bond angle in diamond 109 5 |
| B. | Conduction in copper wire Free electron |
| C. | An example of hydrogen bond Hydrogen |
| D. | Thermal expansion in metallic Ionic bond bond is greater than that in |
| Answer» D. Thermal expansion in metallic Ionic bond bond is greater than that in | |
| 268. |
Capacitors to be used at high frequencies require a material whose loss angle is: |
| A. | low |
| B. | high |
| C. | uniform |
| D. | one |
| Answer» B. high | |
| 269. |
The rate of diffusion process will increase if temperature is: |
| A. | decreased |
| B. | increased |
| C. | constant |
| D. | sub-zero |
| Answer» C. constant | |
| 270. |
The crystal structure in most of the common metals is: |
| A. | cubic |
| B. | rhombohedral |
| C. | tetragonal |
| D. | triclinic |
| Answer» B. rhombohedral | |
| 271. |
In a simple cubic structure, are the direction [100] and plane (100) parallel? |
| A. | No |
| B. | Yes |
| C. | May be both |
| D. | Can t be predicted |
| Answer» B. Yes | |
| 272. |
A member of ceramic family is: |
| A. | bainite |
| B. | garnet |
| C. | LDPE |
| D. | high speed steel |
| Answer» C. LDPE | |
| 273. |
Magnetic head recorder is made of: |
| A. | metallic glass |
| B. | rochelle salt |
| C. | ferrous alloy |
| D. | nonferrous metal |
| Answer» B. rochelle salt | |
| 274. |
The coordination number for structure of gold is: |
| A. | 4 |
| B. | 16 |
| C. | 12 |
| D. | 1 |
| Answer» D. 1 | |
| 275. |
The nature of bond is governed by the: |
| A. | Geometry of unit cell |
| B. | Electron structure of the atom |
| C. | Orientation of crystal |
| D. | Basis of filling of space lattice |
| Answer» C. Orientation of crystal | |
| 276. |
The forces involved in the chemical bonding are: |
| A. | Pauli s forces |
| B. | Newton s forces |
| C. | Planck s forces |
| D. | Coulomb s forces |
| Answer» E. | |
| 277. |
Which of the following is not a thermally actuated process? |
| A. | Recrystallization of metal |
| B. | Creep of I. C. engine piston |
| C. | Vulcanization of rubber |
| D. | None of the above |
| Answer» E. | |
| 278. |
Activation energy is the potential energy that brings: |
| A. | unstable material into metastable state |
| B. | unstable material into stable state |
| C. | metastable material into stable state |
| D. | stable material into metastable state |
| Answer» B. unstable material into stable state | |
| 279. |
Out of the 4 electrode materials, highest emission efficiency is given by: |
| A. | Tungsten |
| B. | Thoriated tungsten |
| C. | Oxide coated cathode |
| D. | Cesium |
| Answer» D. Cesium | |
| 280. |
The number of effective atoms per unit cell in a FCC structure is: |
| A. | one |
| B. | four |
| C. | six |
| D. | two |
| Answer» C. six | |
| 281. |
A resistor with negative temperature coefficient is called as a: |
| A. | potentiometer |
| B. | thermistor |
| C. | phototransistor |
| D. | varactor |
| Answer» C. phototransistor | |
| 282. |
With increase in temperature, the mean free path: |
| A. | decreases |
| B. | increases |
| C. | remains unchanged |
| D. | vanishes |
| Answer» B. increases | |
| 283. |
A unit cell is: |
| A. | the smallest group of atoms when regularly repeated, forms a crystal |
| B. | the basic building block of a crystal |
| C. | a cube containing the largest number of atoms |
| D. | an agglomerated structure |
| Answer» B. the basic building block of a crystal | |
| 284. |
In an imperfection free crystal, the resistivity will be: |
| A. | infinite |
| B. | zero |
| C. | negative |
| D. | unity |
| Answer» C. negative | |
| 285. |
In germanium atom, high energy is carried by electrons in the: |
| A. | innermost shell |
| B. | outermost shell |
| C. | second shell |
| D. | third shell |
| Answer» C. second shell | |
| 286. |
A material has forbidden energy gap E |
| A. | a good conductor |
| B. | an insulator |
| C. | a semiconductor |
| D. | a varactor |
| Answer» C. a semiconductor | |