What are runners, suckers and bulb?

Tube feet are without suckers in

Rhizome/runner is

In a hurdle race, a runner has probability p of jumping over a specific hurdle. Given that in 5 trials, the runner succeeded 3 times, the conditional probability that the runner had succeeded in the first trial is (a) 3//5 (b) 2//5 (c) 1//5 (d) None of these

If the probability that a randomly selected bulb produced by a factory will fuse after 200 days of use is 0.15, then in a random selection of 8 bulbs, the probability of getting not more than one bulb that will fuse after 200 days of use is -

A solenoid with an iron core and a bulb are connected to a.d.c.source. How does the brightness of the bulb change, when the iron core is removed from the solenoid?

(A]: The relationship between sucker fish and shark is considered to be an example of parasitism. [R]: Sucker fish gets food and shelter from shark and also alters the population growth of the shark

An electric bulb is marked 100W,230V. If the supply voltage drops to 115V, what is the heat and light enegry produced by the bulb in 20 min. ?

A few electric bulbs are connected in series to the 220 V mains . One bulb fused , the remaining bulbs are again put in series and connected to the same supply of 220 V. In which case will the bulbs glow brighter and why ?