NSMQ2025 Trier Contests: Past Questions and Answers (fundamental, Speed Race, and True/False): SET 05.
NSMQ2025 Trier Contests: Past Questions and Answers (fundamental, Speed Race, and True/False): SET 05.
FUNDAMENTAL
Preamble: Give the site for the production of the given hormone
- Oxytocin
Answer: hypothalamus
- Melatonin
Answer: pineal gland
- Progesterone
Answer: ovary (ovaries)
Preamble: Differentiate between lenticels and stomata with respect to;
- Where are they found?
Answer: Lenticels are found in roots and fruits, whilst stomata are found in leaves
- Active period
Answer: Lenticels are active at night, whilst stomata are active during the day
- Amount of water (vapour) released
Answer: A small amount of water vapour is released through the lenticels, whilst a large amount of water vapour is emitted through the stomata.
Preamble: if one of the diameters of a circle, A, is a chord to another circle with centre, C., determine the radius of the circle, c, with the given equation for A and centre, C.
- ( − 1)2 + ( − 3)2 = 4 (2,1)
Answer: 3
- ( − 2)2 + ( − 4)2 = 9 (3,4)
Answer: √10
- ( − 3)2 + ( − 5)2 = 16 (6,5)
Answer: 5
- Find the molar mass in g/mol of an unknown solute if a 5.00% solution of cane sugar of molar mass 340 g/mol is isotonic with a 2.00% solution of the unknown solute.
Answer: 136 g/mol
- A 3% solution of a solute with a molar mass of 120 g/mol is isotonic with a 5% solution of another unknown solute. Determine the molar mass of the unknown solute.
Answer: 200 g/mol
- A 4.00% solution of glucose (180 g/mol) is isotonic with a 3.00% solution of an unknown solute. Calculate the molar mass of the unknown solute.
Answer: 135 g/mol
- The mass of 0.50 moles of compound A3B2 is 66 g. Given that the atomic mass of element A is 24 g, determine the atomic mass of B.
Answer: 30 g
- The mass of 0.60 moles of compound A2B is 66 g. Given that the atomic mass of element A is 39 g, determine the atomic mass of B.
Answer: 32 g
- The mass of 0.30 moles of compound M3X is 39 g. Given that the atomic mass of element M is 25 g, determine the atomic mass of X.
Answer: 55 g
- Two balls are dropped from the same height at an interval of 1.0 seconds. Determine the distance of separation between the two balls after 3.0 seconds of the drop of the first ball.
Answer: 25 m
- Two balls are dropped from the same height at an interval of 2 seconds. Determine the distance of separation between the two balls after 4 seconds of the drop of the first ball.
Answer: 60 m
- Two balls are dropped from rest at an interval of 0.50 seconds. Determine the distance of separation between the two balls after 2.0 seconds of the drop of the first ball.
Answer: 8.8 m
- A small speaker delivers 2 W of audio output. Determine the area around the speaker that could detect a 120 dB intensity sound?
Answer: 2 m2
- A small speaker delivers 2 W of audio output. Determine the area around the speaker that could detect a 140 dB intensity sound?
Answer: 0.02 m2
- A speaker delivers 50 W of audio output. Determine the area around the speaker that could detect a 110 dB intensity sound?
Answer: 500 m2
SPEEDRACE
- Which ion is the most abundant intracellular cation?
Answer: potassium ion or K+
- What is the name of the hormone that regulates the 24-hour (diurnal) rhythm of our body, such as the sleep-wake cycle?
Answer: Melatonin
- Why is the sunflower not considered a flower?
Answer: Sunflower lacks either the male (Stamens) or the female organs (Pistils) or the gametes.
- State the products that are expected from the disproportionation reaction of hypochlorous acid, HOCl.
Answer: HCl and HClO3 (hydrogen chloride and chloric acid) 2 HOCl → 2HCl + HClO3
- Why are we called Group 1 and 2 metals “alkali” and “alkaline?
Answer: These metals react with water to form OH (aq) ions and create a basic or “alkaline” environment.
- The Ksp of strontium sulphate is 2.5 x 10-7. Calculate the solubility of strontium sulphate in pure water and in a 0.10 mol/dm3 solution of Na2SO4.
Answer: In pure water, the solubility is 5.0 x 10-4, and in Na2SO4, the solubility is 2.5 x 10-6.
- Determine the force on a proton that moves in a straight line for a distance of 5.0m along a path whose electric field is 2.0 × 10-7 V/m.
Answer: 3.2 x 10-12N F = qE
- Determine the time taken for an 840 W heater to heat a 1-litre water from 10 ⁰C to 40 ⁰C
Answer: 150 seconds
- Express 5.5 eV in joules.
Answer: 8.8 × 10−19J E = 5.5 eV x (1.6 x 10-19) = 8.8 x 10–19J
- Find the vertex of a parabola which has the origin as its focus and the line x = 2 as the directrix?
Answer: (1, 0)
- If the perpendicular bisector of the line segment joining P (1, 4) and Q (k, 3) has slope 4. Find the value of k.
Answer: 5
- If the mean of the 10 numbers 10, 22, 26, 29, 34, x, 42, 67, 70, y is 42, find x + y.
Answer: 120
TRUE/FALSE
- H3PO3 is a stronger acid than H2SO3
Answer: False
- HClO4 is a weaker acid than HClO3
Answer: False
- HNO3 is a stronger acid than HNO2
Answer: True
- The characteristic colour of copper ions in a blue flame is bluish green
Answer: True
- The characteristic colour of calcium ions in a blue flame is pink
Answer: False. It is red
- The characteristic colour of potassium in a blue flame is lilac
Answer: True
Preamble: In a simple harmonic oscillator, at the mean position
- Kinetic energy is maximum
Answer: True
- Velocity is minimum
Answer: False
- Acceleration is zero
Answer: True
- Continuous X-rays are made up of radiation spanning a broad continuous range of wavelengths.
Answer: True
- Continuous X-rays are the luminous emission observed emanating from the filament in an X-ray tube.
Answer: False
- The spectrum of continuous X-rays is bell-shaped and is described by the same formula as the spectrum of blackbody radiation.
Answer: False
Preamble: The given infinite series has a finite sum.
- 64 + 32 + 16 + 8 + 4 + 2 + 1 + . . .
Answer: True
- 1 – 1 + 1 – 1 + 1 – 1 + . . .
Answer: False
- 1 + ½ + ¼ + 1/8 + 1/16 + . . .
Answer: True
- A reflection in the y-axis is a linear transformation.
Answer: True
- A reflection in the origin is a linear transformation.
Answer: True
- A reflection in the line y = 2 is a linear transformation.
Answer: False
Preamble: Consider the given statement of secondary succession and state whether it is True or False.
- It begins on a bare rock
Answer: False
- It occurs on a deforested site
Answer: True
- It is similar to primary succession except that it is relatively fast pace.
Answer: True
Preamble: In an ecosystem, the given cycle is a one-way passage
- Carbon
Answer: False
- Nitrogen
Answer: False
- Potassium
Answer: False
