NSMQ2025 Preliminary Day One Contest: Sample Questions and Answers (SET O1).

Find the change in potential energy of an object of the given weight w when its height above ground changes from H₁ to H₂ as given;

1. W = 20.0N, h₁ = 3.0m, and h₂ = 5.0 m

Ans:  40 J

2. W= 4.0N, h₁ =6.0m and h₂ =3.0m

Ans: -12 J

3. W = 1.0N, h₁ = 18m and h₂ = 11m

Ans: -7.0 J

Find a natural number, n, such that;

4. 132_n = 156

Ans: 11

5. 155_n = 305

Ans: 15

6. 173_n = 263

Ans: 13

7. The mass of 250 moles of the compound XCl₂ is 27.75 g. Determine the atomic mass of element x

Ans: 40.0g/mol

8. The mass of 0.100 moles of the compound X₂O₃ has a mass of 15.9 g. Find the atomic mass of element x.

Ans: 55.5g/mol

9. The mass of 0.150 moles of the compound X(NO₃)₂ Weighs 18.9 g. Calculate the atomic mass of x.

Ans: 2.0g/mol

10. Name the phylum of invertebrates with the largest number of species.

Ans: Phylum Arthropoda

11. Name the structure in insects that is responsible for delivering oxygen directly to their tissues.

Ans: Trachea

12. What name is given to the smallest basic unit of a compound eye in cockroaches.

Ans: Ommatidia

Preamble: Find the quantity of heat required to change the temperature of the given mass m of a substance of specific heat capacity 450.0 J/kgK from 25.0^oC to the given temperature T.

13. m = 2.0 kg and T = 30.0^o

Ans: 4,500 J

14. m = 3.0kg and T = 27.0^oC

Ans: 2,700 J

15. m = 6.0kg and T = 45.0^oC

Ans: 5,400 J

16. Name the molecule that replaces the electron loss by PS₂ in the light reaction of photosynthesis.

Ans: Water

17. A cell in the basal layer of the skin of a type of mammal contains 52 chromosomes and divides by mitosis to produce new skin cells. After 10 successive divisions, how many chromosomes will be left in the basal layer of the skin.

Ans: 52 chromosomes

18. Name the process by which RNA is produced.

Ans: RNA transcription

19. Find the acceleration of a 2kg particle on which 7i N (-3i + 2J).

Ans: (2i + J) ms^-2

20. A student cycles 2 kilometers in 15 minutes, rests for 5 minutes, then cycles 1.5 kilometers in 10 minutes. What is the average speed of the student as expressed in kilometers per hour?

Ans: 7 km/h

21. Find the energy in electron volts or eV of the most energetic electron that can be emitted from a metal of work function 3.0 electron volts. When illuminated by 4.15 electron volt photons.

Ans: 0.95 electron volts

22. Determine the number of hydrogen atoms in 9.2 grams of ethanol.

Ans: 7.2 x 10²³ atoms.

23. What volume of 0.250 moldm^-3 sodium hydroxide, or NaOH, is needed to neutralize 50.0 cm³ of 0.150 moldm^-3 H₂SO₄?

Ans: 60.0cm³

24. Give the sum of the values of the oxidation states of manganese in the compounds MnF₃, MnO₂, and K₃MnO₄.

Ans: 12.

TRUE/FALSE

25. All exothermic reactions are spontaneous.

Ans: False

26. An endothermic reaction can be spontaneous.

Ans: True

27. A spontaneous reaction always occurs rapidly.

Ans: False.

Preamble: Indicates whether the given statement is true or false regarding apical meristem.

28. Apical meristem is found in bats and growing tips of roots in plants.

Ans: True

29. Apical meristem is found, is involved in the formation of flowers and leaves.

Ans: True

30. Apical meristem is used to induce plant growth.

Ans: True

Preamble: The magnitude of the impulse of the net force on an object is one newton second.

31. The magnitude of the linear momentum of the object is one newton second.

Ans: False

32. The object moves with constant velocity.

Ans: False

33. The acceleration of the object is one meters per second squared.

Ans: False

34. Long chain alcohols dissolve readily in water.

Ans: False

35. The solubility of an alcohol always increases with increasing number of hydroxyl groups.

Ans: True

36. Butanol is less soluble in water than methanol.

Ans: True

37. Both plasma and serum are present in the blood.

Ans: True

38. The process of centrifugation cannot be used to isolate plasma and serum from the blood.

Ans: False

39. Both plasma and cerium contain metabolites, electrolytes, proteins, and antibodies.

Ans: True

Preamble: The given number is divisible by nine.

40. 4,653

Ans: True

41. 5,373

Ans: True

42. 8,155

Ans: False

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