RRB JE CBT-2 Civil · 4 Jun 2025 — Mathematics
RRB Junior Engineer (JE) · previous year paper
3 Mathematics questions from RRB JE CBT-2 Civil · 4 Jun 2025, with answers and Hindi and English explanations.
1.
स्थानीय क्षेत्र नेटवर्क (Local Area Network, LAN) की विशिष्ट सीमा क्या होती है?
What is the typical range of a Local Area Network (LAN)?
- (A)50 km से अधिकMore than 50 km
- (B)1 km तकUp to 1 km
- (C)5 km तकUp to 5 km
- (D)10 km तकUp to 10 km
Show answer and explanation
Answer: (B)
1 km तक
Up to 1 km
LAN किसी भवन या परिसर जैसे छोटे क्षेत्र में कंप्यूटरों को जोड़ता है, सामान्यतः लगभग 1 km तक। MAN एक शहर और WAN बड़े क्षेत्रों को कवर करता है।
A LAN connects computers within a small area such as a building or campus, typically up to about 1 km. MAN covers a city and WAN covers larger regions.
2.
80 kg और 250 kg द्रव्यमान की दो वस्तुएं एक दूसरे से 200 m की दूरी पर रखी गई हैं। उनके बीच गुरूत्वीय बल कितना होगा? (G = 6.7 × 10⁻¹¹ N⋅m²/kg²)
Two objects of masses 80 kg and 250 kg are placed 200 m apart. What is the gravitational force between them? (G = 6.7 × 10⁻¹¹ N⋅m²/kg²)
- (A)3.35 × 10⁻¹¹ N
- (B)6.35 × 10⁻¹¹ N
- (C)4.50 × 10⁻¹¹ N
- (D)5.75 × 10⁻¹¹ N
Show answer and explanation
Answer: (A)
3.35 × 10⁻¹¹ N
F = G m₁m₂ ÷ r²। F = 6.7 × 10⁻¹¹ × 80 × 250 ÷ 200² = 6.7 × 10⁻¹¹ × 20000 ÷ 40000 = 6.7 × 10⁻¹¹ × 0.5। अतः उत्तर 3.35 × 10⁻¹¹ N है।
F = G m₁m₂ ÷ r². F = 6.7 × 10⁻¹¹ × 80 × 250 ÷ 200² = 6.7 × 10⁻¹¹ × 20000 ÷ 40000 = 6.7 × 10⁻¹¹ × 0.5. So the answer is 3.35 × 10⁻¹¹ N.
3.
यदि संपर्क क्षेत्रफल बढ़ जाए जबकि प्रणोद (thrust) स्थिर रखा जाए, तो दाब __________।
If the area of contact increases while keeping the thrust constant, the pressure will __________.
- (A)पहले बढ़ेगा, फिर घटेगाfirst increase, then decrease
- (B)घटेगाdecrease
- (C)बढ़ेगाincrease
- (D)समान रहेगाremain the same
Show answer and explanation
Answer: (B)
घटेगा
decrease
दाब = प्रणोद ÷ क्षेत्रफल। प्रणोद स्थिर रहने पर संपर्क क्षेत्रफल बढ़ने से दाब घटता है। अतः दाब घटेगा।
Pressure = thrust ÷ area. With the thrust constant, a larger contact area gives a smaller pressure. So the pressure will decrease.
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