NSMQ2025 Trier Contests: Past Questions and Answers (fundamental, Speed Race, and True/False): SET 03
NSMQ2025 Trier Contests: Past Questions and Answers (fundamental, Speed Race, and True/False): SET 03
FUNDAMENTAL CONCEPT
- What is the name of the outermost layer of the epidermis of the skin?
Answer: Stratum corneum
- Which of the human body’s layers has the thinnest stratum corneum?
Answer: (upper) eyelids
- Which of the human body’s parts has the thickest stratum corneum?
Answer: palm or soles
Preamble: In the blood, carbon dioxide is carried or transported in three primary forms. Name one.
- Answer:
- Dissolved state (dissolved gas) under normal pressure and temperature
- As carbamino compounds, carbon dioxide directly combines with Hb to form an unstable compound, the carbamino compounds
- As bicarbonate ions.
- What is the ratio of the angles of a triangle if the sides of a triangle are in the ratio 1: √3: 2?
Answer: 1:2:3
- What is the ratio of the angles of a triangle if the sides of a triangle are in the ratio 1:1:√2?
Answer: 1:1:2
- What is the ratio of the angles of a triangle if the sides of a triangle are in the ratio 1:√3:1?
Answer: 1:1:4
Preamble: Find the values of a and n in the binomial expansion if
- (1 + )n = 1 + 8 + 242 + ⋯
Answer: a = 2, n = 4
- (1 + ) n = 1 + 10 + 452 + ⋯
Answer: a = 1, n = 10
- (1 + ) n = 1 + 15 + 902 + ⋯
Answer: a = 3, n = 5
Preamble: determine the mass of solute required to prepare
- 600 dm3 of 0.050 mol/dm3 solution of Na2SO4.
Answer: 4.3 g
- 400 dm3 of 0.10 mol/dm3 solution of KNO3.
Answer: 4.0 g
- 800 dm3 of 0.020 mol/dm3 solution of CaCl2.
Answer: 1.8 g
Preamble: Name the instrument used to measure the given quantities
- Determine the wavelength of different colours of white light or the refractive index of a prism
Answer: Spectrometer
- Detect infrared radiation
Answer: Pyrometer (accept bolometer or thermopile)
- Measure luminous intensity
Answer: Photometer
Preamble: A constant N net force acts on an object of mass, m, that is initially at rest. Find the kinetic energy of the object at the instant the impulse of the net force equals, .
- I = 5.0 Ns m = 3.0 kg
Answer: 4.2 J
- I = 6.0 Ns m = 4.0 kg
Answer: 4.5 J
- I = 8.0 Ns m = 5.0 kg
Answer: 6.4 J
SPEEDRACE
- Even though aluminium and thallium are group-13 metals, Aluminium is usually found in the +3 oxidation state and thallium in the +1 and +3 oxidation states. Why this difference?
Answer: This is due to the inert pair effect of the group-13 elements (ns2 np1) as you go down the group.
- What is the hybridization of boron in diborane, B2H6?
Answer: sp3
- What mass is present in one mole of diethyl ether?
Answer: 74 g/mol
- An electron traveling 600 m/s enters a uniform magnetic field and experiences a magnetic force, causing it to travel in a circular path. What is the radius of the circular path if the magnetic field strength is 0.20 mT?
Answer: 1.7 cm (0.017 m)
- A 1500 kg car undergoes an acceleration of () = 6. 002. What is the distance travelled by the car after exactly 3.00 seconds?
Answer: 40.5 m
- A mass attached to a spring, fixed to a wall. If the mass is pulled away from the equilibrium and released, at what point does the mass experience its maximum kinetic energy?
Answer: At the spring’s equilibrium position
- What is the remainder when the polynomial f(x) = 2x3 – 4x2 + 7x + 4 is divided by (x – 2)
Answer: 18
- Find the coordinates of the stationary points of the curve, y = x3 – 3x + 5
Answer: (1, 3), (-1, 7)
- In humans, what is the name given to the joint found between the sternum and the ribs?
Answer: Cartilaginous joint
- Flowers that have a single ovule in the ovary and are packed into an inflorescence are usually pollinated by which agent?
Answer: Wind
- Why are cyanobacteria used in agricultural fields for crop improvement?
Answer: Cyanobacteria can fix atmospheric nitrogen and make it available to the plants
TRUE OR FALSE
Preamble: With respect to the group-13 elements;
- Boron trioxide is acidic
Answer: True
- Oxides of aluminium and gallium are amphoteric
Answer: True
- Oxides of indium and thallium are basic
Answer: True
- Alkanes with a higher number of carbon atoms generally have higher boiling points
Answer: True
- Alkanes undergo addition reactions with halogens to form haloalkanes
Answer: False
- Branched alkanes can pack closely in the solid state, leading to lower melting/boiling points.
Answer: True
Preamble: Cooking gas containers are kept in a bus moving with a uniform speed. Consider the given statement about the temperature of the gas molecules inside the container.
- The temperature will decrease for some and increase for some gas molecules
Answer: False
- The temperature will decrease
Answer: False
- The temperature will increase
Answer: False
- The photoelectric ejection of an electron from a metal surface occurs after enough photons have fallen on the surface to give their energy to the electron.
Answer: False
- When a metal surface is illuminated with photons of suitable energy, a small but measurable time lag is observed between turning on the illumination and the ejection of photoelectrons.
Answer: False
- The number of electrons emitted in unit time from a metal surface by the photoelectric effect depends on the number of photons of energy exceeding the threshold energy that fall on the surface in unit time.
Answer: True
- If the sum of the angles of a triangle is 300°, then it is a pentagon.
Answer: True
- If the diagonals of a kite bisect the vertex angles, then it is a rectangle.
Answer: True
- If the sum of the exterior angles of a polygon is 400°, then it is a circle.
Answer: True
Preamble: The given equation of a line is in slope-intercept form.
- x + 2y = 5
Answer: False
- x/3 + y/-3 = 1
Answer: False
- y – 5 = 2(x – 1)
Answer: False
Preamble: Yeast is employed in the production of
- lactic acid
Answer: False
- cheese
Answer: False
- beer
Answer: True
Preamble: Parasitic adaptations include
- Loss of unnecessary sense organs
Answer: True
- Loss of reproductive capacity
Answer: False
- Development of adhesive organs
Answer: True
