Use the figures above to answer the question below

Which of the following diagrams represents correctly an n-p-n transistor?

When the base current of a common-emitter transistor is kept at zero, it operates in the 

In the photoelectric effect, which of the following graphs correctly represents the graph of stopping potential Vo against frequency,f, of incident light?

The amount of energy released when 0.5kg of uranium is burnt completely is [c = 3 x 10\(^8\)m/s]

A motorcyclist traveling at 30ms\(^{-1}\) starts to apply his brakes when he is 50m from the traffic light that had just turned red. If he reached the traffic light, his decceleration is