RRB Group D — All Mix Practice Set


Q1. What is 15% of ₹800 ?


A) 100  B) 120  C) 140  D) 160


Ans: B) ₹120


Explanation15% of ₹800 = 800 × 15/100 = ₹120


Q2. An article is bought for ₹600 and sold for ₹720. Find the profit percentage.


A) 15%  B) 20%  C) 25%  D) 30%


Ans: B) 20%


ExplanationProfit = Selling Price − Cost Price = 720 − 600 = ₹120


Profit% = 120/600 × 100 = 20%


Q3. Complete the number series: 7, 14, 28, 56, ?


A) 84  B) 96  C) 112  D) 120


Ans: C) 112


Explanation: 7 × 2 = 14, 14 × 2 = 28, 28 × 2 = 56, 56 × 2 = 112


Q4. If CAT = DBU, then DOG = ?


A) EPH  B) EOG  C) FPH  D) DPH


Ans: A) EPH


ExplanationEach letter is shifted one position forward: C → D, A → B, T → U


Similarly: D → E, O → P, G → H


Therefore, DOG = EPH.


Q5. When did the Constitution of India come into effect ?


A) 15 August 1947  B) 26 January 1950  C) 26 November 1949
D) 2 October 1950


Ans: B) 26 January 1950


ExplanationThe Constitution of India came into effect on 26 January 1950.


Q6. What is the process by which plants prepare their food called ?


A) Respiration  B) Photosynthesis  C) Excretion  D) Transpiration


Answer: B) Photosynthesis


ExplanationPlants prepare their food using sunlight, carbon dioxide and water. This process is called photosynthesis.


Q7. What is the HCF of 36 and 48?


A) 6  B) 8  C) 12  D) 16


Ans: C) 12


Explanation: 36 = 2² × 3², 48 = 2⁴ × 3, HCF = 2² × 3 = 12


Q8. Which is the longest river in India ?


A) Yamuna  B) Ganga  C) Godavari  D) Narmada


Ans: B) Ganga


Explanation: The Ganga is the longest river in India.


Q9. In which medium does sound travel fastest ?


A) Gas  B) Liquid  C) Solid  D) Vacuum


Ans: C) Solid


ExplanationSound travels fastest through solids, slower through liquids and gases, and cannot travel through a vacuum.


Q10. If A:B = 4:5 and B:C = 10:15, then A:C = ?


A) 4:15  B) 8:15  C) 10:15  D) 12:15


Ans: B) 8:15


ExplanationA : B = 4 : 5 = 8 : 10


B : C = 10 : 15


Therefore, A : B : C = 8 : 10 : 15


So, A:C = 8:15.


Ans: B) 8:15

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