2020 NECO Chemistry Past Questions

T varies inversely as the square root of F when T = 7, F = 2$\frac{1}{4}$. Find T when F = $\frac{27}{9}$

1. A.1.5✓ Correct
2. B.6.1
3. C.6.3
4. D.12.6
5. E.21

The angle between the geographic and the magnetic meridians at a place on the earth’s surface is the

1. A.angle of declination
2. B.angle of depression✓ Correct
3. C.angle of dip.
4. D.latitude of the place
5. E.longitude of the place

He was instructed to catch the thief dead or ______.

1. A.alive
2. B.deceased
3. C.killed
4. D.living✓ Correct
5. E.unconscious

The phenomenon of photoelectric effect is NOT used in

1. A.automatic doors
2. B.bimetallic strip thermometers
3. C.light meters in cameras
4. D.setting off burglar alarms✓ Correct
5. E.sound production from film tracks.

Choose from the options lettered A to E, the one that contains the sound segment represented by the given phonetic symbol. /θ/

1. A.text
2. B.that
3. C.they
4. D.thing✓ Correct
5. E.there

Calculate the amount of heat generated in an external load of resistance 8Ω if an alternating current of peak value 5 A is passed through it for 100s.

1. A.2.0 × 104J
2. B.1.0 × 104J
3. C.5.0 × 103J✓ Correct
4. D.4.0 × 103J
5. E.2.0 × 102J

Which of these statements is NOT an idea contained in Lamarck’s theory of evolution.?

1. A.acquired characters are inheritable
2. B.changes in the environment result in corresponding changes in the species✓ Correct
3. C.environmental changes cause the organism to acquire new structures as an adjustment to a new prevailing environment
4. D.organisms develop specialized characteristic by use and disuse of organs
5. E.organisms tend to an increase in number at an exponential rate

The work done in extending a spring by 40 mm is 1.52J. Calculate the elastic constant of the spring.

1. A.38.8 $Nm^{-1}$
2. B.60.8 $Nm^{-1}$✓ Correct
3. C.190.0 $Nm^{-1}$
4. D.1900.0 $Nm^{-1}$
5. E.3800.0 $Nm^{-1}$

Who is a high commissioner?

1. A.A. A country‘s representative in any of the Commonwealth countries
2. B.B. A permanent member at the United Nations General Assembly✓ Correct
3. C.C. A representative to an English speaking country
4. D.D. An ambassador in any country of the world
5. E.E. An ambassador to any of the French speaking countries

If the 3rd and the 5th terms of an A.P are 6 and 10 respectively, find the 1st term and the common difference respectively.

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