SSC CGL 2024 Tier-I · 23 September 2024, Shift 2 · General Intelligence and Reasoning · Question 22 of 100

Text as printed on a candidate's response sheet for this shift; answer per SSC's tentative key as marked on that sheet. Solution last reviewed 10 September 2026.

Where this paper and its answers come from

SSC does not publish CGL question papers or a public answer key. The questions and options here are reproduced as printed on a candidate's own response sheet for this shift — the Commission's text, unchanged. Each answer is SSC's tentative key as marked on that sheet; SSC allowed challenges to it and never publishes a final key. The solutions are written by UnlockIAS.

Select the word-pair that best represents a similar relationship to the one expressed in the pair of words given below. (The words must be considered as meaningful English words and must NOT be related to each other based on the number of letters/number of consonants/vowels in the word) Frequency : Hertz

(a)Power : Newton
(b)Resistance : Candela
(c)Illuminance : Lux
(d)Force : Volt

Answer

Why

Correct — C. The given pair is a physical quantity beside its SI unit.

Rule: quantity : the unit that actually measures it. Frequency is measured in hertz.

Illuminance — the luminous flux landing on a surface — is measured in lux, one lumen per square metre.

That is the one pairing here in which the unit belongs to the quantity printed beside it, so Illuminance : Lux, option (c).

Why the others are wrong

(a)
Power : Newton — Power is measured in watts. The newton is the unit of force, so this pair crosses two different quantities.
(b)
Resistance : Candela — Resistance is measured in ohms. The candela is the SI base unit of luminous intensity and has nothing to do with resistance.
(d)
Force : Volt — Force is measured in newtons. The volt measures electric potential difference, so the pair is mismatched.

Concept

This is a units question wearing a word-pair costume. The relationship on offer is quantity-to-unit, and the wrong options recycle real SI units against the wrong quantities.

Fix the seven SI base units first — metre, kilogram, second, ampere, kelvin, mole, candela.

Then learn the derived units that keep appearing: newton (force), joule (energy), watt (power), pascal (pressure), hertz (frequency), volt (potential difference), ohm (resistance) and lux (illuminance).

Every unit in the option list is a genuine SI unit — newton, candela, lux and volt. The error is always in the pairing, never in the unit itself.

Key facts

Hertz is the SI unit of frequency: one cycle per second.
Lux is the SI unit of illuminance: one lumen per square metre.
Candela is the SI base unit of luminous intensity, one of the seven base units.
Newton measures force, watt measures power, and volt measures potential difference.

Study next

The seven SI base units and the quantities they measureDerived SI units named after scientists: newton, joule, watt, pascal, hertz, volt, ohm, teslaInstrument-and-quantity pairs, such as ammeter and current

Common traps

Accepting a pair because the unit and the quantity come from the same branch of physics
Confusing luminous intensity (candela) with illuminance (lux)
Reading Power : Newton as correct because both words belong to mechanics

The same word-pair frame carries geography and biology links too — also asked 23 Sep 2024, 09:00, Reasoning Q.14 (Australia : Emu) and 19 Sep 2024, 12:30, Reasoning Q.14 (Ethiopia : Addis Ababa).

Related PYQs

No directly related past PYQ was found.