Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about ________ decibels?

The specific speed of a pump is defined as the speed of a unit of such a size, that it________?

As per Kirchoff‟s law, the ratio of the total radiating power to the absorptivity of a body depends on the________?

Pick out the wrong statement?

Which of the following is not a high alumina refractory material?

Stainless steel is welded with difficulty because of________?