NSMQ2025 Preliminary Stage Sample Past Questions and Answers: SET 07.

Preamble: Identify the major interatomic bond in the given molecule as polar covalent, nonpolar covalent, dative covalent, ionic, or metallic.

1. Potassium oxide.

Ans:  ionic.

2. Carbon dioxide.

Ans: Polar covalent.

Ans: Nonpolar

Preamble: Two fair dice are thrown. Find the probability that the total score is

4. five

Ans: 1/9

5. Nine

Ans: 1/9

6. Six

Ans: 5/36

Preamble: A particle moves along a straight line with a constant acceleration of 4.0ms^–1. Find the speed of the particle 2.0 seconds after it attains the given speed.

7. 0ms^-1.

Ans: 12ms^-1.

8. 0ms^-1.

Ans: 14ms^-1.

9. 0m^-1.

Ans: 9.0ms^-1.

Preamble: Mention the type of compound leaf to which the given description refers

10. A compound leaf resembling a feather, where the leaflets are arranged in two rows along a central stalk called the rachis.

Ans: Pinnate leaf

11. A compound leaf with leaflets that radiate from a single point at the tip of the petiole, resembling the fingers of a hand.

Ans: Palmate leaf

12. A pinnate compound leaf that has an even number of leaflets attached oppositely on the rachis, which ends with two leaflets.

Ans: paripinnate

13. A sample of gas initially has a pressure of 120.0 kPa, a volume of 150.0 cm³, and a temperature of 300.0 K. The gas expands to a volume of 250.0 cm³, whilst its temperature increases to 450.0 K. Calculate the new pressure of the gas.

Ans: 108.0 kPa.

14. A gas has a volume of 180.0 cm³ when its pressure is 90.0 kPa, and temperature is 300.0 K. If the pressure decreases to 60.0 kPa, while the temperature rises to 450.0 K, calculate the new volume of the gas.

Ans: 405 cm³.

15. A sample of gas occupies 100.0 cm³ at a pressure of 200.0 kPa and a temperature of 250.0 K. If the pressure is reduced to 100.0 kPa and the volume expands to 300.0 cm³, calculate the new temperature of the gas.

Ans: 375.0 K

Preamble: Find two integers with sum S and product P given.

16. S = 7 and P = -18

Ans: 9 and -2

17. S = -9 and P = 20

Ans: -4 and -5

18. S = 13 and P = 42

Ans: 6 and 7

19. Find the power dissipation of a 25-ohm resistor with 5 volts across it.

Ans: 1 W

20. Find the resistance of a resistor that dissipates 2 watts when the voltage across it is 2 volts.

Ans: 2 ohms.

21. Find the power dissipation of a 5-ohm resistor with 10 volts across it.

Ans: 20 W

Preamble: Mention one of the four common features that appear at some point during the development of chordates.

22. Ans:

• the dorsal hollow nerve cord,
• the notochord
• the pharyngeal slits,
• the postanal tail.

23. Find the voltage across a 2mH inductor when the current in it is changing at 15 amperes.

Ans: 30mV

24. Find the velocity of object A relative to object B. (48:41) If the velocity of A relative to C is 2i centimetres per second, and the velocity of B relative to C is 2j centimetres per second.

Ans: (2i -2j) cm/s

25. What is the process by which nitrogen is made available to plants in the soil?

Ans: Nitrogen fixation.

26. What name is given to the stamen of flowers that are partially united and are present in two branches?

Ans: Didelphos arrangement.

27. Given the vectors A equals 3I plus 7J and B equals 2I plus 5J, find the length of the vector A plus B.

Ans: 13

28. Find the coordinate of the vertex of the quadratic curve y = x² – 6x + 7.

Ans: x = 3 and y = -2

29. Determine the sum of the coefficients of all reactants and products in the balanced equation of the convection of ammonia to produce nitrogen gas and water.

Ans: 15

30. Calculate the absolute value of the molar heat of convection for 1-butene if 11.2 grams of 1-butene burns in excess oxygen, releasing 532 kilojoules of heat.

Ans:  2660 kilojoules per mole

31. Determine the total number of atoms indicated by the molecular formula of 1, 2, 4, 5-tetramethylcyclohexane.

Ans: 30

TRUE/FALSE

Preamble: The force of friction on an object moving over a rough inclined plane.

1. Has a direction determined solely by the orientation of the inclined plane.

Ans: False

2. Maintains a constant direction.

Ans: False

3. It’s always opposite the velocity of the object.

Ans: True

4. In plants, the protoxylem represents the first-formed xylem elements.

Ans: True

5. In plants, the protoxylem is found close to the periphery of the stem.

Ans: False

6. In plants, the vessels of the protoxylem exhibit annual and spiral thickening.

Ans: True

7. All ionic compounds are strong electrolytes in water.

Ans: False

8. All weak acids are weak electrolytes.

Ans: True

9. The conductivity of strong electrolytes increases with dilution.

Ans: False

10. The vectors a equals 2i minus 3j and b equals 3i plus 2j are perpendicular.

Ans: True

11. The vectors a equals 5i plus 3j and b equals 3i minus 4j are perpendicular.

Ans: False

12. The vectors a equals 4i plus 3j and b equals negative 3i plus 4j are perpendicular.

Ans: True

Preamble: A charged 2uF capacitor has a potential difference of 10V across its plates.

13. The energy stored by the capacitor is 10uJ.

Ans: False

14. The energy stored by the capacitor is less than 10uJ.

Ans: False

15. The energy stored by the capacitor is greater than 100uJ.

Ans: False

16. Internal fertilization and external fertilization occur in both plants and animals.

Ans: True

17. Mobile male gametes and immobile female gametes are produced in both internal and external fertilization.

Ans: True

18. The final product of both internal and external fertilization is the zygote.

Ans: True

19. Hydrogen bonds are stronger than covalent sigma bonds.

Ans: False

20. Dipole-dipole interaction occurs between polar molecules.

Ans: True

21. The boiling point of a substance depends primarily on the strength of its intermolecular forces.

Ans: True

22. X minus 1 is a factor of x cubed minus 3x squared plus 2.

Ans: True

23. X plus 1 is a factor of x cubed plus 5x squared minus 4.

Ans: True

24. X minus 2 is a factor of x cubed minus 3x squared plus 6.

Ans: False

Source: Galmeek.com

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