NSMQ2025 Preliminary Stage Sample Past Questions and Answers: SET 05.

Preamble: Give one importance of turgidity in plants.

1. Answer:

• Turgidity provides mechanical support to the plant, that is, it gives the plant its fixed shape.
• It builds up root pressure in root cells
• It helps seedlings to sprout out of the hard ground.
• Involved in various types of movements, that is the opening of flowers, the bending of young stems, and the inclining.
• It provides firmness to soft tissues.
• Regulates the opening and closing of stomata.

Preamble: Ten pieces of paper are marked 0, 1, 2, 3, all the way to 9, respectively, and put in a box. A piece of paper is randomly removed from the box. Find the probability that the number on is,

2. An even number.

Ans: 1/2.

3. A prime number.

Ans: 2/5.

4. A number strictly between one and eight.

Ans: 3/5

Preamble: Find the power developed when the point of application of the given force, F, moves at the given velocity, V.

5. F = (6I – 3J)N and V = (3I + 4J)m/s

Ans: 6W

6. F = (-5i + 16J)N and V = (-2i + 5J)m/s

Ans: 90W

7. F = (15I + 11J)N and V = (12I – 10J)m/s

Ans: 70W

Preamble: Give the two major elements that form the given alloy.

8. Duralumin

Ans: Aluminium and copper

9. Stainless steel

Ans: iron and chromium.

10. Soda

Ans: tin and lead.

Preamble: Indicate how the following adapts skeletal muscle fibers to their function.

11. Actin and Myosin

Ans: Enables the skeletal muscle fibers to contract and expand effectively.

12. High density of mitochondria.

Ans: The high density of the mitochondria helps provide sufficient energy for the contraction and relaxation of the muscles.

13. Elongated fibers.

Ans: It allows for the change in length of the muscle.

14. Given that the standard enthalpy of formation of butane, C₄H₁₀, is negative 125.0 kJmol^-1. How much energy is released or absorbed when 29.0 grams of butane are formed from its elements?

Ans: 62.5kJ of energy is released.

15. Given that the standard enthalpy of formation of pent-1-ene, C₅H₁₀, is negative 120.0 kJmol^-1, how much energy is released or absorbed when 35.0 grams of pent-1-ene is formed from its elements?

Ans: 60.0kJ of heat is released

16. Given that the standard enthalpy of formation of hex-1-ene, C₆H₁₀, is negative 168.0kJmol^-1, how much energy is released or absorbed when 20.5 grams of hex-1-ene is formed from its elements?

Ans: 40.0kJ of heat is released

17. Determine the concentration of potassium sulfate in a solution made by dissolving 8.7g of potassium sulfate in a volume of 200.0cm³.

Ans: 0.25moldm^-3.

18. Determine the sum of the coefficients of reactants and products in a balanced equation of the reaction C₅H₈ plus O₂ going into H₂O plus CO.

Ans: 18

19. Find the sum of the smallest and largest angles of a triangle if the angles of the triangle are in the ratio 2:3:5.

Ans: 126 degrees.

20. A and B are events in a sample space S, with the probability of A = 2/5 and, probability of B = 3/7. Find the probability of A union B given A and B are mutually exclusive.

Ans: 29/35

21. Find the magnitude of the gravitational force that a 10.0 kg particle and a 4.0 kg particle exert on each other when they are 5.0m apart. Give your answer in scientific notation.

Ans: 1.1 x 10^-10N

22. Find the power dissipation of a 5-ohm resistor carrying a current of 4 amperes.

Ans: 80W

23. Give the complementary sequence to GCUCGU.

Ans: CGAGCA

24. Name the end product of the ammonification process.

ANS: Ammonia.

25. What term is used to describe the zone where fresh water and sea water meet?

Ans: Estuary

TRUE/FALSE

Preamble: The given pair of lines is either parallel or perpendicular.

1. x + 2y = 5 and 2x – 10.

Ans: True

2. 3x – y = 8 and 3x + y = 5.

Ans: False

3. y = 2X + 5 AND 4x – 2y = 15.

Ans: True

Preamble: A sample of a solid conductor and a sample of a solid insulator contain the same number of atoms.

4. The conductor contains mobile atoms, whereas the insulator does not.

Ans: False

5. The conductor contains mobile phonons, whereas the insulator does not.

Ans: False

6. The conductor contains mobile neutrons, whereas the insulator does not.

Ans: False

7. Offspring receive valuable qualities from both parents in insect pollination.

Ans: False

8. Offspring receive valuable qualities from both parents in self-pollination.

Ans: False

9. Offspring receive valuable qualities from both parents in wind pollination.

Ans: False

10. In a redox titration, the equivalence point is reached when one of the oxidizing or reducing agents has been consumed.

Ans: False

11. Oxidizing agents lose electrons during redox reactions.

Ans: False

12. In a redox reaction, the oxidizing agent is reduced while the reducing agent is oxidized.

Ans: True

Preamble: A particle falls freely from rest.

13. The initial acceleration of the particle vanishes.

Ans: False

14. The initial velocity of the particle vanishes.

Ans: True

15. The initial potential energy of the particle vanishes.

Ans: False

16. During the expiration phase of respiration, the diaphragm relaxes and edges upwards.

Ans: True

17. In the expiration phase of respiration, the ribs move upwards.

Ans: False

18. In the expiration phase of respiration, the sternum moves up and away from the backbone.

Ans: False

19. The solubility of CaF₂ decreases when NaF is added to its solution.

Ans: True

20. The common ion effect is an application of Le Chatelier’s principle.

Ans: True

21. The common ion effect can be suppressed by complex ion formation.

Ans: True

Source: Galmeek.com

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