Which electromagnetic waves are used for the following purposes?
(i) Diagnostic tool in medicine.
(ii) Kill germs in water purifiers.
(iii) Cellular phones.
(iv) In remote switches of household electronic systems.

Which of the following are not electromagnetic waves? (i) sound waves (ii) radiowaves (iii) X rays (iv) water waves

Electromangnetic waves with wavelength (i) lambda_1 is used in satellite communication. (ii) lambda_2 used to kill germs in water purifier. lambda_ used to detect leakage of oil in underground pipelines. lambda_4 used to improve visibility in runways during fog and mist conditions. (a) Identify and name the part of e.m. spectrum to which these radiations belong. (b) Arrange these wavelengths in ascending order of their magnitude. (c) Write one more application of each.

Which of the following is (are) an endothermic process(es)? (i) Dilution of sulphuric acid (ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water

Account for the following (i) Curdling of milk (ii) Tail of coments (iii) Use of potash alum in the purification of water (iv) cleansing action of soap

Which two of the following are used for preparing iodised salt? (i) KIO_(3) (ii) KI (iii) I_(2) (iv) HI

Which of the following solutions are electrolytes? i. Dil. HCl ii. Sugar Solution iii. Alcohol in water iv. Lime water