How to Master the ielts

Q41
(second paragraph) 
TRUE. Incandescent bulbs convert more energy to 
heat than light. The statement is true because
‘converting less than 10
% 
of the energy into light with the rest as heat’ means more energy converted
to heat than light (more than 90
%).
A traditional light bulb is an incandescent 
bulb as described in the first sentence of the second paragraph.
Q42 
(third paragraph) 
FALSE. Ultraviolet light (UV) can be seen with the 
naked eye. The statement is false because 
‘this light is invisible’
, 
referring to the ultraviolet (UV) light, means that it cannot be seen with the 
naked eye. (Q42 – trick. You may be tricked into answering TRUE. The word 
‘visible’ applies to white light not to UV light.)
Q43 
(third paragraph) 
NOT GIVEN. Compact fluorescent lamps (CFLs) last 
about 10 years.
There is no information on the lifespan of CFLs in the 
passage. We cannot say whether it is true or false. (Q43 – trick. ‘ten times
the life expectancy’ does not mean lasting 10 years.)
201

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HOW TO MASTER THE IELTS
202
Q44 
(fourth paragraph) 
TRUE. Fluorescent tubes are the best light for work-
places.
The answer is true because
 ‘The bright light produced by standard 
fluorescent lights makes them an ideal choice for offices and factories
’. True 
because 
‘ideal’
means ‘best’; and ‘offices and factories’ are ‘workplaces’.
Q45 
(fifth paragraph) 
FALSE. Incandescent bulbs contain mercury.
The 
answer is false because 
‘Traditional bulbs… are free from mercury’
, means 
that they do not contain any mercury, noting that an incandescent bulb is a 
traditional bulb.