RRB NTPC CBT-1 previous year question
Which substance would you use to test if lemon juice contains acid?
Asked in RRB NTPC 2026 — 18 June Shift 2 · General Awareness
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Correct answer: (B) Litmus paper
Litmus paper is used to test acidity: it turns blue litmus paper red in the presence of an acid such as citric acid found in lemon juice.
हिंदी में प्रश्न
चोल, दक्षिण भारत में निम्नलिखित में से किस राजवंश की सत्ता को उखाड़ फेंकने के बाद सत्ता में आए?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) ued SN ee
लिट्मस पत्र का उपयोग अम्लता जाँचने के लिए किया जाता है: नींबू के रस में मौजूद साइट्रिक एसिड जैसे अम्ल की उपस्थिति में यह नीले लिट्मस पत्र को लाल कर देता है।
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