NSMQ2024 1/8th Stage: Sample Past Questions and Answers: SET 03.

Preamble: Give the formula of the product formed when the given compounds react in an aqueous medium, and identify any precipitates formed

1. Sodium sulphide and zinc nitrate

Ans: NaNO₃ and ZnS. The precipitate formed is ZnS

2. Potassium carbonate and barium nitrate

Ans: KNO₃ and BaCO_3, the precipitate formed is BaCO₃.

3. Lithium Iodide and lead II nitrate

Ans: PbLi₂ and LiNO₃, the precipitate formed is PbLi₂.

Preamble: Find the resistance in a series R-L-C circuit of the given moduli of impedance Z and reactance X

4. Z = 39 ohms and X = 36 ohms

Ans: 15 ohms

5. Z = 60 ohms and X = 36 ohms

Ans: 48 ohms

6. Z = 26 ohms and X = 10.0 ohms

Ans: 24 ohms

7. Name the unspecialized type of plant tissue that can divide and differentiate into other types of plant tissue.

Ans: Parenchyma tissue

8. What is the result of meiosis in angiosperms?

Ans: The production of haploid megaspores and microspores.

9. What process is most directly affected when a tree is gathered by completely removing a ring of bark?

Ans: Translocation.

10. Give the systematic name of one isomer of the compound with molecular formula C₄H₆Br₂. Given that it is a cycloalkane with a methyl substituent.

Ans:

• 1, 2 – dibromo – 3 – methyl cyclopropane
• 1, 2 – dibromo – 1 – methyl cyclopropane
• 1, 1 – dibromo – 2 – methyl cyclopropane

Preamble: Two identical balls, each of mass m, are separated center to center by a distance d. Find the magnitude of the gravitational force between the balls, given that;

11. m = 2.5kg and d = 2.0m.

Ans: 1.0 x 10^-10N

12. m = 3.0kg and d = 0.05m

Ans: 2.4 x 10^-9N

13. m = 7.0kg and d = 0.35m

Ans: 2.7 x 10^-8N

Preamble: Indicate parts of the body of organisms to which the following prefix refers

14. Gastro

Ans: stomach

15. Cephalo

Ans: Head

16. Arthro

Ans: Joint

17. State the term that describes insects that feed on blood.

Ans: Hematophagous insects

18. What name is given to hyphae that continue cytoplasm throughout the entire structure, allowing for easy movement of nutrients and organelles, and whose nuclei are not separated by cross-walls?

Ans: Coenocytic hyphae

19. Name the enzyme that catalyzes the phosphorylation of glucose (46:02) to form glucose-6-phosphate

Ans: Hexokinase

20. Calculate the mass of ammonia produced when 3.50 grams of nitrogen reacts with excess hydrogen

Ans: 4.25g

21. A straight-chain diol has a molar mass of 146 grams per mole and contains 8 carbon atoms. Determine the number of hydrogen atoms present in the alcohol.

Ans: 18

22. What volume of water must be added to 42 cm³ of a 0.60 mol/dm³ HCl solution to dilute it to a concentration of 0.20 mol/dm³?

Ans: 84 cm³.

23. A 2kg object on a rough horizontal surface is pushed from rest to a speed of 3m/s over a distance of 2m by a constant 5N force acting in the direction of the object’s motion. Find the magnitude of the friction force on the object.

Ans: 0.5N

24. Young’s modulus for a polymer blend is 1.6GPa. What stress in a 15cm long polymer rod results in a 0.30mm elongation?

Ans: 3.2GPa

TRUE/FALSE.

Preamble: In any electric circuit, the algebraic sum of the current flowing into any given node.

1. Equals the current supplied by the electric power source.

Ans: False

2. Equals the net current supplied by the electric power source.

Ans: False

3. Equals zero.

Ans: True

4. Lithium and manganese are commonly extracted from their ores using electrolysis.

Ans: False

5. Smelting involves heating an ore in the presence of a reducing agent to extract a metal.

Ans: True

6. Copper is commonly extracted by smelting using carbon monoxide.

Ans: True

7. Plants that reproduce sexually are more genetically stable than those that reproduce asexually.

Ans: False

8. Plants that reproduce asexually have greater genetic diversity than those that produce sexually.

Ans: False

9. Plants that reproduce sexually reach maturity faster than those that reproduce asexually.

Ans: False

Preamble: The potential energy of a particle moving along the X-axis is given by CX^2, where C is a constant.

10. An SI unit for C is newton per meter.

Ans: True

11. The net force on the particle is zero at X = 0.

Ans: True

12. The total energy of the particle is zero at X = 0.

Ans: False

13. Crude oil is separated into different fractions based on boiling points.

Ans: True

14. Gasoline is a lighter fraction of crude oil and boils at a lower temperature than diesel.

Ans: True

15. Lubricating oils and waxes are collected from the top of the fractional distillation column.

Ans: False

16. Adults have more bones than infants.

Ans: False

17. Yellow marrow only exists in adult bones, but not in infant bones.

Ans: True

18. Some of the bone marrow in adults remains as red bone marrow to produce red blood cells.

Ans: True

Source: Galmeek.com

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