2020 NECO Literature in English Past Questions

At s.t.p, a mole of chlorine occupies 22.4dm3. If the temperature is changed to 35°C and the pressure to 750mHg the of the new volume will be [Cl = 35.5]

1. A.$\frac{760\times 22.4\times 308}{750\times 273\times 35.5} dm^3 $✓ Correct
2. B.$\frac{760\times 22.4\times 308}{750\times 273}dm^3 $
3. C.$\frac{750\times 22.4\times 35.5}{760\times 273}dm^3$
4. D.$\frac{760\times 22.4\times 35.5}{750\times 22.3\times 273}dm^3 $
5. E.$\frac{760\times 22.4\times 35.5}{750\times 308}dm^3 $

C$_6$H$_{12}$O$_6$ What is the molar mass of the compound above? [ H=1, C=12, O=16 }

1. A.45
2. B.61✓ Correct
3. C.180
4. D.123
5. E.244

What is the volume of a cube if the diagonal of one of the sides is $\sqrt{50}$cm?

1. A.7.07cm$^3$
2. B.50.0cm$^3$✓ Correct
3. C.125.0cm$^3$
4. D.353.4cm$^3$
5. E.625.0cm$^3$

(a) What is an operating system? (b) Give three examples of operating system. (c) State two differences between the floppy disk and compact disc. (d) Write a Basic program to calculate the perimeter of a rectangle.

What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?

1. A.Covalent✓ Correct
2. B.Dative
3. C.Hydrogen
4. D.Ionic
5. E.Metallic

A box is pulled a distance s along a smooth horizontal floor by a force of magnitude F, inclined at an angle θ to the horizontal. The work done is

1. A.Fs cos θ
2. B.Fs cosec θ✓ Correct
3. C.Fs sec θ
4. D.Fs sin θ
5. E.Fs tan θ

What is the total surface area of a cylinder with radius 2cm and height 1.5cm, correct to 2 significant figures?

1. A.440cm$^2$✓ Correct
2. B.220cm$^2$
3. C.88cm$^2$
4. D.44cm$^2$
5. E.22cm$^2$

1 megabyte is equivalent to ...... kilobytes?

1. A.A.  1000
2. B.B. 1024
3. C.C. 1034✓ Correct
4. D.D. 1204
5. E.E. 1304

The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is

1. A.3✓ Correct
2. B.9
3. C.10
4. D.18
5. E.32

The following are associated with succession EXCEPT

1. A.changes in species composition
2. B.competition among organisms
3. C.decrease in number of organisms✓ Correct
4. D.diversity of organisms
5. E.habitat change