2023 NECO Government Past Questions

Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at 1.5 × 10m5Nm-2pressure becomes 300cm3 at 1.0 × 105Nm-2 pressure?

1. A.Avogadro’s
2. B.Boyle’s✓ Correct
3. C.Charles’
4. D.Faraday’s
5. E.Graham’s

Soil factors in an ecosystems are referred to as

1. A.biotic
2. B.climatic
3. C.edaphic✓ Correct
4. D.physiographic
5. E.topographic

Choose from the options lettered A - E the one that most appropriately completes each sentence Several ....... attended the three-day summit.

1. A.heads of state
2. B.head of state
3. C.heads of states✓ Correct
4. D.head of states
5. E.heads of the states

A car travels with a constant velocity of 45 $kmh^{-1}$ for 20s. What distance does it cover in this time?

1. A.0.025m
2. B.0.250m
3. C.2.500m
4. D.25.000m✓ Correct
5. E.250.000m

A platinum-resistance thermometer has a resistance of 4Ω at 0°C and 12Ω at 100°C. Assuming that the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45°C.

1. A.6.0Ω
2. B.6.42Ω
3. C.7.6Ω
4. D.8.4Ω
5. E.16.0Ω✓ Correct

A current flows in a series circuit containing a resistor, R, an inductor, L and a capacitor, C. Which of the following is true of the power dissipated in the circuit component(s)?

1. A.The power dissipated in L is greater than zero
2. B.The power dissipated in R is zero
3. C.The sum of the power dissipated in L and C is equal to that in R✓ Correct
4. D.The sum of the power dissipated in L and C is greater than in R
5. E.The sum of the power dissipated in L and C is zero

Which compound can be used as a reducing agent in a reaction?

1. A.Cl2
2. B.KMnO4✓ Correct
3. C.KCr2O7
4. D.MnO2
5. E.Na2SO3

Which formula is used to indicate the degree of acidity of an acid?

1. A.$ [H^+] = ^{\text{mass of acid relative}} molecular mass of acid $
2. B.F = number of H+ = ions x molar mass of the acid✓ Correct
3. C.Kw = [H+][OH-]
4. D.pH = - log10[H+]
5. E.pKa = -log10Ka

Which of the following is NOT part of an a.c generator?

1. A.Commutator
2. B.Armature✓ Correct
3. C.Field magnet
4. D.Carbon brushes
5. E.Slip rings

In which of the following are the substances arranged in descending order of their thermal conductivities?

1. A.aluminium, copper, iron
2. B.aluminium, iron, copper
3. C.copper, aluminium, iron✓ Correct
4. D.copper, iron. aluminium
5. E.iron, copper, aluminium