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
The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is
A Zero
B Negative
C Positive
D About 2 ohms per degree
Electric bulbs are made of __________ glass.
A Jena
B Flint
C Crookes
D Pyrex
Electric bulbs are filled with :
A Nitrogen
B Carbon dioxide
C Argon
D Oxygen
Electric bulb filament is made of :
A Copper
B Aluminum
C Zinc
D Tungsten
Electric bukb filament is mede of -
A Copper
B Aluminum
C Zinc
D Tungsten
The filament of an electric bulb is made of
A tungsten
B nichrome
C graphite
D iron

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