NSMQ2025 Trier Contests: Past Questions and Answers (fundamental, Speed Race, and True/False): SET 02.

FUNDAMENTA CONCEPTS

Preamble: Name the human system responsible for the given life processes

1. Protection of internal organs

Ans: skeletal system

2. Transport of food and minerals

Ans: circulatory system

3. Excretion of waste

Ans: excretory system

Preamble: state one consequence that results when biochemical pathways remain unregulated

4. Ans:

• improper Immune responses (leading to an overactive or misdirected immune system)
• uncontrolled cell growth (stimulating cells to divide excessively)
• errors in development (resulting in severe developmental abnormalities)
• disruption of homeostasis
• cellular toxicity

Examples of unregulated pathways include cancer pathways, metabolic pathways, and developmental pathways.

5. If (1 − ) is a root of the equation, ² + + (1 − ) = 0, find the value of p.

 Ans: 1

6. If ( + 2) is a root of the equation, ² + + (3 − 4) = 0, find the value of p.

Ans: 0

7. If (1 + ) is a root of the equation, ² + + (2 − 3) = 0, find the value of p.

Ans: 2/3

Preamble: Find the least value of

8. 2 log₁₀ – log_x01, ℎ > 1

Ans: 4

9. 4 log₁₀ – log_x0001, ℎ > 1

Ans: 8

10. 3 log₁₀ – log_x001, ℎ > 1

Ans: 6

Preamble: State the most common method of extraction for the given metal

11. Silver

Ans: Cyanidation (use of cyanide)

12. Magnesium

Ans: Electrolysis

13. Lead

Ans: Reduction (by carbon or carbon monoxide)

Preamble: Determine the molecular formula of the compound formed between sulphur and oxygen given that;

14. 04 % of sulphur and 59.96 % of oxygen are present

Ans: SO₃

15. 04 % of sulphur and 19.96 % of oxygen are present.

Ans: S₂O

16. 71 % of sulphur and 33.29 % of oxygen are present.

Ans: SO

Preamble: Determine the equivalent force constant of the composite spring formed from two equal-length springs with spring constants given as ₁ and ₂

17. ₁ = 35 N m^-1     and ₂   = 65 N m^-1.

Ans: N m⁻

18. = 75 N m     and    = 25 N m^-1.

Ans: N m⁻

19. ₁  = 55 N m     and ₂   = 45 N m^-1.

Ans: N m⁻

SPEEDRACE

1. If the first ionisation potential of sodium (Na) is 5.1 eV, what is the value of the electron gain enthalpy of the sodium ion (Na⁺)?

Ans:       – 5.1 eV

2. During water treatment, what name is given to the synthetic polymer beads that remove dissolved contaminants from water through a process called ion-exchange?

Ans:       Resins

3. Determine the pH of a solution made by dissolving 68.4 mg of barium hydroxide in 8 dm³ of solution. (M_{Ba (OH)2} = 171 g/mol)

Ans:       10

4. A tuning fork arrangement (of two forks) produces 4 beats per second with one fork of frequency 288 Hz. What is the expected frequency of the other fork?

Ans:       292 Hz or 284 Hz

5. Determine the voltage across the terminals of a 36 μF capacitor that stores 162 μJ of energy.

Ans:       . V

6. An atomic transition takes place from E₃ = 5.2 eV to the ground state E₁ = 1.2 eV. What is the wavelength of the photon this transition will emit?

Ans:       310 nm (accept 309 nm)

7. The haversian canals occur in which bone

Ans:       Humerus

8. In the chemistry of vision in mammals, what name is given to the photosensitive substance

Ans:       Rhodopsin

9. What is somatic embryogenesis?

Ans:       This is the process where a plant or embryo is derived from a single somatic cell or group of somatic cells.

TRUE/FALSE

Preamble: The given hormone is involved in sugar metabolism

1. Aldosterone

Ans:       False

2. Insulin

Ans:       True

3. Glucagon

Ans:       True

The parasympathetic nervous system is responsible for

4. Decrease respiration

Ans:       True

5. Increase digestion

Ans:       True

6. Increase in area secretion

Ans:       True

7. For a homogenously gaseous reaction, the equilibrium constant may be influenced by a change in pressure

Ans:       False

8. For a reaction at equilibrium, the addition of a catalyst changes the relative concentration of reactants and products

Ans:       False

9. For a reaction at equilibrium, the addition of a catalyst results in a lower activation energy for both the forward and backward reactions

Ans:       False

Preamble: The given value of x is a solution of the given inequality.

10. x = 2 and x² + 2x – 7 > 0

Ans:       True

11. x = 4 and x² – 2x – 8 < 0

Ans:       False

12. x = -3 and x² – x – 12 > 0

Ans:       False

Preamble: The largest value of the function

13. 15 / (2sinx + 5) is 5

 Ans:      True

14. 10 / (3cosx + 7) is 5/2

Ans:       True

15. 21 / (3sinx + 4) is 21

Ans:       True

Preamble: Consider a closed sphere in the presence of a magnet.

16. The magnetic flux through it is zero regardless of the orientation of the magnet

Ans:       True

17. The magnetic field lines have no starting or ending points in the sphere

Ans:       True

18. There are no magnetic monopoles in the sphere

Ans:       True

19. The magnitude of the force of kinetic friction between two objects in contact is proportional to the weight of the object.

Ans:       False

20. The kinetic friction force between two objects in contact is perpendicular to the weight of the object

Ans:       False

21. The kinetic friction on an object is in the same direction as the motion of the object

Ans:       False

Preamble: The given set of ions is a collection of isoelectronic species

22. K⁺, Cl^–, Ca²⁺, Sc³⁺

Ans:       True

23. N^3-, O^2-, F^–, S^2-

Ans:       False

24. Na⁺ , Mg²⁺ , Al³⁺ , Li⁺ ,

Ans:       False

Source: Galmeek.com

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