2020 NECO Economics Past Questions

A ray of light experiences a minimum deviation when passing through an equilateral triangular glass prism. Calculate the angle of incidence of the ray. [Refractive index of glass = 1.5]

1. A.300.0°✓ Correct
2. B.48.6°
3. C.60.0°
4. D.75.5°
5. E.105.0 °

Which device does NOT make use of the magnetic effects of an electric current?

1. A.hot-wire ammeter✓ Correct
2. B.moving-coil ammeter
3. C.moving-coil loudspeaker
4. D.moving-iron ammeter
5. E.telephone earpiece

Which of the following equations is NOT balanced?

1. A.CH4(g) + 202(9) → CO2(g) + 2H2O(g)
2. B.CU(S) + HNO3(aq) → Cu(NO3)2(aq) + 4H2O(I) + NO(g)✓ Correct
3. C.2KCIO3(s) → 2KCI(s)+ 3O2(g)
4. D.NaH(s) + H2O(1) → NaOH(aq) +H2(g)
5. E.Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)

In which of these fields are repulsive forces NOT experienced? I. Magnetic field II. Gravitational field III. Electric field

1. A.I only
2. B.II only
3. C.III only
4. D.I and III only✓ Correct
5. E.II and III only

The following are involved in reflex action EXCEPT

1. A.brain cells
2. B.intermediate neuron
3. C.motor neuron✓ Correct
4. D.receptor
5. E.sensory neuron

In which of these fields are repulsive forces NOT experienced? I. Magnetic field II. Gravitational field III. Electric field

1. A.I only✓ Correct
2. B.II only
3. C.III only
4. D.I and III only
5. E.II and III only

$^{226}_{88}Ra$ $\to$ $^{222}_{86}Rn$ + X + Energy. The equation above represents a nuclear decay of radium isotope. What is X?

1. A.Alpha particle✓ Correct
2. B.Beta particle
3. C.Gamma ray
4. D.Neutron
5. E.X – ray

What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]

1. A.0.32
2. B.0.64
3. C.3.18✓ Correct
4. D.6.35
5. E.9.65

An astronaut is walking on the moon where the magnitude of the acceleration due to gravity "g’ is one-sixth that on earth. Compared with their magnitudes on the earth, his mass and weight on the moon are

1. A.both less✓ Correct
2. B.less and the same respectively
3. C.the same and less respectively
4. D.the same as on earth
5. E.both greater.

Three non-parallel coplanar forces which can be represented both in magnitude and direction by the three sides of a triangle taken in order will

1. A.have any one force being the equilibrant of the other two
2. B.make a body move randomly
3. C.make a body oscillate
4. D.move a body along a straight line✓ Correct
5. E.rotate a body about its axis