RRB Group D — All Mix Practice Set
Q1. What is 15% of ₹800 ?
A) 100 B) 120 C) 140 D) 160
Ans: B) ₹120
Explanation: 15% 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%
Explanation: Profit = 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
Explanation: Each 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
Explanation: The 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
Explanation: Plants 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
Explanation: Sound 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
Explanation: A : 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