SOF NSO 2023 previous year paper practice · PYQ-pattern set

SOF NSO 2023 PYQ-pattern questions

Showing 10 of the 18 PYQ-pattern questions in this set — freshly worded in that year's pattern, not the original questions. Answers and solutions open under each question.

1. Q1 · Analogy

   Complete the analogy: Doctor : Hospital :: Teacher : ?

   • A. Office
   • B. School
   • C. Library
   • D. Classroom
   Answer and solution

   Answer: B

   Doctor works in a hospital; similarly, a teacher works in a school.

2. Q2 · Non-Verbal Reasoning

   In a certain pattern, the first figure has 4 dots, the second has 7 dots, and the third has 10 dots. How many dots will the fifth figure have?

   • A. 15
   • B. 16
   • C. 17
   • D. 18
   Answer and solution

   Answer: B

   The pattern increases by 3 each time: 4, 7, 10, 13, 16.

3. Q3 · Missing Characters

   Find the missing number: 2, 6, 12, 20, 30, ?

   • A. 40
   • B. 42
   • C. 44
   • D. 48
   Answer and solution

   Answer: B

   The pattern is n(n+1): 1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30, 6×7=42.

4. Q4 · Mirror and Water Images

   If a clock shows 3:40 in a mirror, what is the actual time?

   • A. 8:20
   • B. 8:40
   • C. 9:20
   • D. 9:40
   Answer and solution

   Answer: A

   Mirror time formula: 12:00 - 3:40 = 8:20. The actual time is 8:20.

5. Q5 · Atoms and Molecules

   How many molecules of water are present in 0.5 mole of H₂O? (Given: Avogadro's number = 6.022 × 10²³)

   • A. 3.011 × 10²³
   • B. 6.022 × 10²³
   • C. 1.505 × 10²³
   • D. 9.033 × 10²³
   Answer and solution

   Answer: A

   Number of molecules = Number of moles × Avogadro's number = 0.5 × 6.022 × 10²³ = 3.011 × 10²³ molecules.

6. Q6 · Work and Energy

   A boy of mass 50 kg runs up a staircase of 50 steps in 10 seconds. If the height of each step is 15 cm, what is the power developed by the boy? (Take g = 10 m/s²)

   • A. 275 W
   • B. 375 W
   • C. 475 W
   • D. 575 W
   Answer and solution

   Answer: B

   Total height = 50 × 0.15 = 7.5 m. Work done = mgh = 50 × 10 × 7.5 = 3750 J. Power = Work/Time = 3750/10 = 375 W.

7. Q7 · Force and Laws of Motion

   A rocket works on the principle of conservation of which quantity?

   • A. Mass
   • B. Energy
   • C. Momentum
   • D. Velocity
   Answer and solution

   Answer: C

   A rocket ejects gases backward with high velocity (action), and the rocket moves forward (reaction), demonstrating Newton's third law and conservation of momentum.

8. Q8 · Tissues

   Given below are characteristics of two types of conducting tissues in plants: (i) Multicellular with wide lumen (ii) Dead cells (iii) Long, cylindrical tube-like structure (iv) Elongated cells with tapering ends Which of the above characteristics belong to vessels?

   • A. (i), (ii), and (iii) only
   • B. (ii) and (iv) only
   • C. (i) and (iv) only
   • D. (iii) and (iv) only
   Answer and solution

   Answer: A

   Vessels are multicellular, have wide lumen, consist of dead cells, and form long cylindrical tubes. Tracheids have tapering ends.

9. Q9 · Improvement in Food Resources

   A farmer practices a cropping pattern where two or more crops are grown simultaneously on the same field in distinct rows. What is this practice called?

   • A. Mixed cropping
   • B. Intercropping
   • C. Crop rotation
   • D. Organic farming
   Answer and solution

   Answer: B

   Intercropping involves growing two or more crops simultaneously in distinct rows on the same field to maximize resource use.

10. Q10 · Why Do We Fall Ill

    Which of the following is a means of transmission of communicable diseases?

    • A. Contaminated water
    • B. Genetic inheritance
    • C. Poor diet
    • D. Lack of exercise
    Answer and solution

    Answer: A

    Communicable diseases are transmitted through contaminated water, air, vectors, etc., not through genetic inheritance or lifestyle factors.