Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
Solve it the standard way once — then learn the shortcut.
Q · Current ElectricityMedium · 45s
Which of the following materials can easily become positively charged when rubbed? Option: 1
TopicCurrent Electricity
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Q 1 / 60Next question →
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
When a glass rod is rubbed with silk, electrons move from the glass to the silk, leaving the glass positively charged. This is a classic example of the triboelectric effect.
1
Final Answer: Option A — Glass rod
1