Is the mass of an amber rod after rubbing with fur . (i).less than, (ii) greater than or (iii) same as its mass before charging? Explain.

A charge - is to be placed at either point A or point B in the figure. Consider points A and B lie on a line that is midway between the to positive charges. Is'the net force experienced at point A (i) greater than, (ii) equal to or (iii) less than the net force experienced at point B? Explain.

Predict and explain Gaussian surface A has twice the area of Gaussian surface B. Both surfaces enclose the same charge Q. Is the electric flux through surface A greater than, less than or the same as the electric flux through surface B ?

Which two of the following statements are incorrect regarding in vitro fertilisation ? (i) In this method, ova from the wife/donor female and sperms from the husband/donor male are induced to form zygote in the uterus (ii) If the embryo is having 2 blastomeres, it is transferred into the uterus (iii) If the embryo is with more than 8 blastomeres, it is transferred into the uterus. (iv) The baby thus produced is called test tube baby.

In which type of solution observed molecular mass of solute is greater than normal molecular mass of solute?

Read the following statements and select the correct ones. (i) A given species may occupy more than one trophic level in the same ecosystem at the same time. (ii) Productivity of an aquatic ecosystem is less than that of a terrestrial ecosystem. (iii) Producers constitute the first trophic level of a detritus food chain. A) i and ii B) ii and iii C) i and iii D) i, ii and iii

Mention the types of charges produced on each when (i) glass rod is rubbed with silk and (ii) an ebonite rod is rubbed with wool.