2023 NECO Agricultural Science Past Questions

Faraday s first law of electrolysis can be expressed mathematically as

1. A.m=I/it
2. B.mαit
3. C.Q=it
4. D.QαI/it✓ Correct
5. E.Qαit

An essential element whose deficiency in plants will result in poor growth, particularly of the roots, and is essential for cell well formation is

1. A.calcium✓ Correct
2. B.iron
3. C.magnesium
4. D.nitrogen
5. E.phosphorus

A narrow, uniform glass tube, closed at one end, constains air which is sealed by a thread of mercury. The tube is placed first horizontally and then vertically with the open end at the top. Which of the following statements is correct?

1. A.The length of the entrapped air in the horizontal position is less than that in the vertical position
2. B.The length of the entrapped air in the vertical position is less than that in the horizontal position✓ Correct
3. C.The length of the mercury column becomes shorter in the horizontal position than in the vertical position
4. D.The length of the mercury column becomes shorter in the vertical position than in the horizontal position
5. E.The pressure of the entrapped air is atmospheric in both cases.

A man standing 510m away from a wall sounds a whistle. The echo from the wall reaches him 3s later. Calculate the velocity of sound in air.

1. A.170 $ms^{-1}$
2. B.340 $ms^{-1}$✓ Correct
3. C.680 $ms^{-1}$
4. D.765 $ms^{-1}$
5. E.1530 $ms^{-1}$

The logical unit of transfer between the backing storage and main memory in file organization is called?

1. A.A. block✓ Correct
2. B.B. bucket
3. C.C. hash
4. D.D. hit
5. E.E. partial

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✓ Correct
3. C.magnetic relay
4. D.telephone earpiece
5. E.thermostat

A tax system in which the income earner pays a fixed percentage of his income annually is known as …………. tax.

1. A.A. direct✓ Correct
2. B.B. indirect
3. C.C. progressive
4. D.D. proportional
5. E.E. regressive

The diagonals of a rhombus are 6cm and 8cm. Find the area of the rhombus.

1. A.96cm2
2. B.48cm2
3. C.24cm2
4. D.0.14cm2
5. E.12cm2✓ Correct

The angle subtended by a diameter of a circle at the circumference is a/an

1. A.acute angle
2. B.obtuse angle✓ Correct
3. C.reflex angle
4. D.right angle
5. E.supplementary angle

Calculate the peak voltage of a mains supply of r.ms. value 220V.

1. A.121 V
2. B.156 V
3. C.225 V
4. D.240 V
5. E.311 V✓ Correct