151 .When X - rays are produced, then
152 .The concept of 'Carban credit' originated from which one of the following?
153 .When we hear a sound, we can identify its source from
154 .Why is red light employed for danger signals?
155 .A ray of light when refracted suffers change in velocity. In theis context, which one among the following statements is correct?
156 .The colour of stars depends upon their
157 .Two bulbs are fitted in a room in the domestic electric installation. One of them glows brighter than the other. Then
158 .Endosulfan spray on cashew crop resulted in the pollution to the tune of tragedy in:
159 .Cadmium pollution is associated with-
160 .How can boiling point of a liquid be reduced?
161 .Clothes keep us warm in winter because they
162 .Transboundary pollution (or) Acid rain is caused by:
163 .SPM stands for
164 .Who invented the battery?
165 .A fuse wire is characterized by