RRB NTPC Maths Practice – Set 14
📘 Instructions: नीचे दिए गए प्रत्येक प्रश्न को ध्यान से पढ़ें और सही उत्तर चुनें।
1. A train running at the speed of 54 km/hr crosses a pole in 10 seconds. Find the length of the train.
A. 120 m
B. 150 m
C. 180 m
D. 100 m
उत्तर: C. 180 m
2. If the cost price of 15 articles is equal to the selling price of 12 articles, then the gain percent is:
A. 20%
B. 25%
C. 30%
D. 35%
उत्तर: B. 25%
3. The average of 5 numbers is 27. If one number is excluded, the average becomes 25. Find the excluded number.
A. 30
B. 35
C. 40
D. 45
उत्तर: C. 40
4. The value of (999)² is:
A. 998001
B. 999001
C. 999999
D. 998009
उत्तर: A. 998001
5. What is the least number which when divided by 12, 16, 20 and 24 leaves remainder 4 in each case?
A. 124
B. 244
C. 484
D. 244
उत्तर: C. 484
6. If x = 4, what is the value of x³ − 3x² + 2x?
A. 24
B. 28
C. 32
D. 36
उत्तर: B. 28
7. A can do a piece of work in 12 days and B in 15 days. They work together for 5 days. How much work is left?
A. 1/4
B. 1/3
C. 2/5
D. 5/12
उत्तर: A. 1/4
8. The simple interest on ₹2000 at 5% p.a. for 2 years is:
A. ₹100
B. ₹200
C. ₹180
D. ₹220
उत्तर: A. ₹200
9. The perimeter of a semi-circle of radius 14 cm is:
A. 72 cm
B. 71.68 cm
C. 64 cm
D. 58 cm
उत्तर: B. 71.68 cm
(Perimeter = πr + 2r)
10. A person sold a watch for ₹960 and gained 20%. What was the cost price?
A. ₹800
B. ₹850
C. ₹780
D. ₹900
उत्तर: A. ₹800
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