2024 NECO Agricultural Science Past Questions

The most efficient absorber of ultraviolet radiation in the atmosphere is

1. A.CO2
2. B.H2✓ Correct
3. C.H2O
4. D.02
5. E.O3

The alloy used for welding and plumbing contains

1. A.aluminum and copper.✓ Correct
2. B.copper and tin
3. C.iron and aluminum.
4. D.lead and antimony.
5. E.lead and tin.

The nth term of a sequence is given as $4 \times 3^{(3 - n)}$. Calculate the third term.

1. A.12✓ Correct
2. B.32
3. C.4
4. D.3
5. E.1

A substance is said to be hygroscopic when it

1. A.absorbs atmospheric moisture and then goes into solution
2. B.absorbs atmospheric moisture but does not go into solution
3. C.changes colour✓ Correct
4. D.is not affected by atmospheric moisture
5. E.losses its water of crystallization

The magnetic effect of a current-carrying coil is NOT utilized in the making of a/an

1. A.carbon microphone
2. B.electric bells
3. C.magnetic relay
4. D.telephone earpiece✓ Correct
5. E.thermostat

What is the colour of phenolphthalein indicator in a basic medium?

1. A.Blue
2. B.Colourless
3. C.Orange✓ Correct
4. D.Pink
5. E.Yellow

Which of the following is used in a nuclear reactor to slow down fast moving neutrons?

1. A.graphite rods
2. B.carbon dioxide gas
3. C.liquid sodium metal
4. D.concrete shield✓ Correct
5. E.boron rods

Simplify $(216^{{\frac{1}{3}}})^{-2}$

1. A.$\frac{1}{36}$✓ Correct
2. B.$\frac{1}{18}$
3. C.$\frac{1}{13}$
4. D.$\frac{1}{6}$
5. E.$\frac{1}{3}$

Determine the value of x from the nuclear reaction below, $^{222}_{86}Rn$ → $^{x}_{88}Ra$ + 2β + energy

1. A.220
2. B.222
3. C.224
4. D.226✓ Correct
5. E.228

The inability of the eye to focus near objects is known as

1. A.astigmatism
2. B.eye ring
3. C.hypermatropia
4. D.myopia✓ Correct
5. E.presbyopia