Trying to find the right answer to this..

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

The Solid State

Short Answer Type

221. Which solid is likely to be the best material for converting sunlight into electricity?

255 Views

222. In an alloy of gold and cadmium, gold crystallizes in cubic structure occupying the corners only and cadmium fits into the face centre voids. What is quantitative composition of the alloy?

379 Views

223. What is the difference between glass and quartz, though both contain SiO₄^4– units?

179 Views

224. What is the effect of Frenkel defect on electrical conductivity of the solid?

1229 Views

225. What other element may be added to silicon to make electrons available for the conduction of electric current?

468 Views

226. Why does Frenkel defect not change the density of AgCl crystal?

In the frenkel defect the ions are not removed from the crystal to maintain electrical neutrality. so there will be no change in the crystal structure. that is there is no decrease in the no of ions.all the ions are inside the crystal.they are only dislocated.

804 Views

227. What is the difference between ferromagnetic and ferrimagnetic substances?

224 Views

228. Which ‘point defect’ lowers the density of ionic crystals?

228 Views

Long Answer Type

229. Assign reasons the following:
(i) Phosphorus doped silicon is a semi-conductor.
(ii) Schottky defect lowers the density of a solid.
(iii) Some of the very old glass objects appear slightly milky instead of being transparent.

384 Views

230. What is a semiconductor? Describe two main types of semiconductors, giving examples and their distinctive features.

354 Views