General Knowledge

Science & Technology

Medium

Which of the following statements about electric wires is NOT true?

The wire of black insulation, is a neutral wire.

In our houses we receive AC electric power of 220 V with a frequency of 50 Hz. One of the wires in this supply is with red insulation, called live wire.

The third is the earth wire that has pink insulation and this is connected to a metallic body deep inside earth. It is used as a safety measure to ensure that any leakage of current to a metallic body does not give any severe shock to a use.

The electric wires used in houses are generally made of copper.

✅ Correct Option: 3

Option 1 -> Black insulation correctly identifies a neutral wire in standard electrical systems.

Option 2 -> This accurately describes household AC power supply (220V/50Hz) with red insulation for the live wire.

Option 3 -> While the earth wire function is correct, the color is WRONG - earth wires have green or green/yellow insulation, NOT pink.

Option 4 -> Copper is indeed the standard material for household electrical wiring due to its excellent conductivity.

Hence, Option 3 -> The earth wire (ground wire) is always identified by green or green/yellow striped insulation for safety standardization worldwide, never pink. This color coding is critical for safety and is internationally standardized to prevent electrical accidents -> correct

2025: 29 May Shift 2

Which among the following crops helps in restoring soil fertility by fixing nitrogen from the air?

2025: 29 May Shift 2

Cells of cork contain a substance called :

2026: 18 May Shift 1

Who among the following suggested that a magnet must also exert an equal and opposite force on a current-carrying conductor?

2026: 14 May Shift 1

The process of conversion of water vapour into its liquid form is called ____

2026: 20 May Shift 2

Arrange the following parts of plants from root to top sequence-

A. Primary Roots

B. Secondary Roots

C. Stem

D. Flower

Choose the correct answer from the options given below:

2022: 24 Aug Shift 1

Which among the following is not an input device ?

Which of the following statements about electric wires is NOT true?

Solution

Related questions:

Keyboard Shortcuts

CUET General Test Past Year Questions (Topic-Wise)