Related Questions

A box contains 10 electric bulbs from which 2 bulbs are defective . Two bulbs are chosen at random. What is the probability that one of them is defective?
A 3/10
B 16/45
C 25/68
D 8/33
a box contains 20 electric bulbs , out of which 4 are defective . 2 bulbs are chosen at random from this box . The probability that at least one of these is defective is
A 7/19
B 6/19
C 5/19
D 3/19
A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random form this box. The probability that at least one of these is defective is ___
A 7/19
B 6/19
C 5/19
D 3/19
From a batch of 3000light bulbs, 100 were selected at random and tested. If 5of bulbs on the sample found defective,How many defective bulb will be found in entire batch?
A 15
B 60
C 150
D 300
An empty fuel tank of a car was filled with A type petrol. When the tank was half-empty, it was filled with B type petrol. Again when the tank was half-empty, it was filled with A type petrol. When the tank was half-empty again, it was filled with B type petrol. What is the percentage of A type petrol at present in the tank?
A 33.5%
B 37.5%
C 40%
D 50%
An empty fuel tank of a car was filled with A type petrol. When the tank was half-empty, it was filled with B type petrol. Again when the tank was half-empty, it was filled with A type petrol. When the tank was half-empty again, it was filled with B type petrol. What is the percentage of A type petrol at present in the tank ?
A 33.5%
B 37.5%
C 40%
D 50%
Electric bulbs are made of __________ glass.
A Jena
B Flint
C Crookes
D Pyrex
The material used in the filament of electric bulbs is
A Nichrome
B Tungsten
C Constantan
D German silver
If tulip bulbs are planted " in the fall", they "could have been" expected " to bloom ' the following" spring.
A in the fall
B could have been
C to bloom
D following
There are 3 green , 4 orange and 5 white color bulbs in a bag. If a bulb is picked at random, what is probability of having either a green or a white bulb?
A 2/3
B 3/4
C 4/3
D 2/5

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