Select the word which means the same as the group of words given. Unit of weight for precious stones
- (a)Pure
- (b)Accurate
- (c)Reliable
- (d)Carat
Answer
Why
Correct — D. The prompt asks for a unit of weight, so the answer has to be a noun that names a unit.
Carat is that unit: the metric carat weighs 200 milligrams, one-fifth of a gram, and gemstones are traded by it.
Pure, accurate and reliable are adjectives about quality. None of them names a measure, so part of speech settles the item before meaning has to → option (d).
Why the others are wrong
- (a)Pure — Pure is an adjective meaning unmixed or unadulterated. It describes what a stone is made of, never how much it weighs.
- (b)Accurate — Accurate means free from error. It describes a measurement, which is not the same thing as being a unit of measurement.
- (c)Reliable — Reliable means dependable, able to be trusted. It belongs to the same quality cluster as pure and accurate and names no unit.
Concept
One-word substitution items reward a check that costs no time: what part of speech must the answer be?
'Unit of weight for precious stones' demands a countable noun naming a measure. Three options here are adjectives, so they are out before you weigh their meanings.
Carat is also worth knowing for its homophone. Carat measures the weight of a gemstone; karat, spelt with a k in American usage, measures the purity of gold in twenty-fourths.
British usage often writes 'carat' for both weight and gold purity, so the spelling distinction is a convention rather than a hard rule.
Key facts
- One metric carat is 200 milligrams, one-fifth of a gram.
- Carat measures gemstone weight, while karat measures gold purity in twenty-fourths.
- Pure gold is 24 karat.
- Three of the four options here are adjectives, so only carat can name a unit.
Study next
Common traps
- Reading 'precious stones' as a question about quality and choosing pure
- Mixing up carat, the weight, with karat, the gold-purity scale
SSC pads a one-word item with options from a single quality cluster so that only one answer is even the right kind of word.
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