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Railway Science Practice Set 20 – 15 Bilingual Questions with Detailed Explanations

This published practice set contains 15 questions for competitive-exam preparation. Preview a few questions below, then start the full quiz to record your attempt. Answers and detailed explanations remain inside the submitted-attempt workflow so the preview does not reveal the solution before practice.

Sample Questions from Railway Science Practice Set 20 – 15 Bilingual Questions with Detailed Explanations

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Q1. A 2 kg object initially at rest is acted upon by a constant net force of 10 N for 4 seconds. What is its final speed?

2 किलोग्राम द्रव्यमान की एक वस्तु प्रारंभ में विराम अवस्था में है। उस पर 10 N का नियत परिणामी बल 4 सेकंड तक कार्य करता है। उसकी अंतिम चाल कितनी होगी?

A. 5 m/s
5 मीटर/सेकंड
B. 10 m/s
10 मीटर/सेकंड
C. 20 m/s
20 मीटर/सेकंड
D. 40 m/s
40 मीटर/सेकंड

Q2. Which enzyme converts fibrinogen into fibrin during the blood-clotting process?

रक्त के थक्के बनने की प्रक्रिया में कौन-सा एंजाइम फाइब्रिनोजन को फाइब्रिन में परिवर्तित करता है?

A. Thrombin
थ्रोम्बिन
B. Pepsin
पेप्सिन
C. Trypsin
ट्रिप्सिन
D. Amylase
एमाइलेज

Q3. Which metal is extracted from its ore mainly by the Hall-Héroult electrolytic process?

किस धातु का निष्कर्षण उसके अयस्क से मुख्यतः हॉल-हेरॉल्ट विद्युत अपघटनी प्रक्रिया द्वारा किया जाता है?

A. Iron
लोहा
B. Copper
तांबा
C. Zinc
जस्ता
D. Aluminium
एल्युमिनियम

Q4. A convex lens has a focal length of 25 cm. What is its power?

एक उत्तल लेंस की फोकस दूरी 25 सेमी है। उसकी शक्ति कितनी होगी?

A. +2 D
+2 D
B. +4 D
+4 D
C. −4 D
−4 D
D. +25 D
+25 D

Q5. Which cell organelle is primarily responsible for modifying, sorting and packaging proteins received from the endoplasmic reticulum?

अंतःप्रद्रव्यी जालिका से प्राप्त प्रोटीनों के संशोधन, वर्गीकरण और पैकेजिंग के लिए मुख्य रूप से कौन-सा कोशिकांग उत्तरदायी है?

A. Lysosome
लाइसोसोम
B. Ribosome
राइबोसोम
C. Golgi apparatus
गॉल्जी तंत्र
D. Centriole
सेंट्रिओल

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