JAMB Physics Reviewed Questions For Day 1

1. The purest form of iron is 

A. wrought iron

B. steel

C. pig iron

D. nickel steel

2. Hydrogen bomb is based on the principle of  

A. nuclear fission

B. nuclear fusion

C. natural radioactivity

D. artificial radioactivity

3. Among the following the maximum covalent character is shown by the compound

A. MgCl2

B. FeCl2

BC. SnCl2

D. AlCl3

4. Which of the following is a non metal that remains liquid at room temperature ?

A. Chlorine

B. Phosphorous

C. Bromine

D. Helium

5. Brass gets discoloured in air because of the presence of which of the following gases in air ?

A. Hydrogen sulphide

B. Oxygen

C. Nitrogen

D. Carbon dioxide

6. Boron cannot form which one of the following anions?

A. BO⁻²

B. BF3⁻⁶

C. BH⁻⁴

D. B(OH)⁻

7. When water freezes its density

A. decreases

B. remains constant

C. increases

D. become zero

8. Which one among the following is the heaviest

A. 1 mole of water molecules

B. 1 mole of ammonia molecules

C. 1 mole of sodium atoms

D. 1 mole of hydrogen molecules

9. The nitrogen atom has 7 protons and 7 electrons,The nitride ion will have

A. 10 protons and 7 electrons

B. . 7 protons and 10 electrons

C. 4 protons and 7 electrons

D. 4 protons and 10 electrons

10. Absolute Zero is defined as

A. The temperature at which all molecular motion ceases

B. At which water boils at 298K

C. At which liquid Helium boils

D. At which the volume becomes

11. Balance the above Chemical equation?

 *Mg+O₂ ➡ MgO* 

A 2Mg + O₂ —-> 2MgO

B 2Mg + O —-> 2MgO

C. 2Mg + O —-> MgO₂

D. 2Mg + O₂ —-> MgO₂

12. Of the following commonly used materials, the one that is not an alloy is

A. Steel

B. Brass

C. Bronze

D. Copper

13. Permanent Hardness of water can be removed by adding

A. Bleaching powder

B. Chlorine

C. Wasshing soda

D. Potassium permanganate

14. The metal which reacts most violently with with cold water is

A. calcium

B. sodium

C. magnesium

D. potassium

15. How many moles are there in 140g of Si (atomic mass of silicon is 28)

A. 5

B. 10

C. 28

D. 140

16. Which of the following are chemical changes?

i. Cooking of Food

ii Digestion of Food

iii Freezing of water

iv Water is heated up

A i & ii

B) I, ii & iii

C) iii & iv

D) All the above

17. Which of the following reactions are exothermic?

 A. C + O₃ ➡ CO₂ 

B. 2Mg + O2 ➡ 2MgO

C. CuSO₄ + 5H₂O ➡ CuSO₄.5H₂O

D. 4 All the above

18. Which combination of atoms can form a polar covalent bond?

A. H and Br

B. H and H

C. Na and Br

D. N and N 

19. Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to

A dehydration

B oxidation

C reduction

D dehydrogenation

20.The freezing point of water at 760mm pressure is

A. 0 K

B. 273 K

C. 273 C

D. -273 C

21. Which of the following carbon compounds is used as a fire- extinguisher ?

A. Carbon disulphide

B. Chloroform

C. Carbon tetrachloride

D. Methyl ene chloride

22. An oxide XO₂ has a vapour density of 32. What is the atomic mass of X?

A. 32

B. 20

C. 14

D. 12

23. If 10cm³ of distilled water is added to 10 cm³ of an aqueous salt solution, the concentration of the solution

A. increases

B. decreases

C. remains constant

D. doubles

24. Acidic industrial waste can be treated with

A. lime

B. brine

C. water

D. enthanol

25. Waste plastics accumulate in the soil and pollute the environment because plastic materials are

A. insoluble in water

B. non-biodegradable

C. easily affected by heat

D. inflammable

26. The conclusion from Rutherford’s from radioactive substance alpha-scattering experiment is that

A. atoms are mostly empty space with a samll

B. emissions from radioactive substances consist of three main components

C. there is unclear pull on orbital electrons

D. electrons are deflected by both magnetic and electric fields

27. If a metal R forms a compound with the formula R(NO₃)₂ the formula of its tetraoxosulphate (VI) is

A. R(SO₄)₂

B. RSO₄

C. R₂SO₄

D. R₂(SO₄)₃

28. Which of the following decreases when a given mass of gas is compressed to half its initial volume?

A. Average intermolecular distance

B. Frequency of collisions

C. Number of molecules present

D. Atomic radius of each particle

29. What volume of hydrogen will be produced if 100cm3 of ammonia is completely decomposed at constant temperature and pressure? The equation for the reaction is 2NH₃ (g) ➡ N₂(g) + 3H₂ (g)

A. 50cm³

B. 150cm³

C. 200cm³

D. 300cm³

30. Place these hydrocarbons in order of decreasing boiling point.

A. Paraffin > Octadecane > Neohexane > Hexane > Ethane

B. Paraffin > Octadecane > Hexane > Neohexane > Ethane

C. Hexane > Paraffin > Octadecane > Neohexane > Ethane

D. None of the above

31. If a reaction is exothermic and there is a great disorder, it means that

A. the reaction is static

B. the reaction is in a state of equilibrium

C. there will be a large increase in free energy

D. there will be a large decrease in free energy

32. In the preparation of oxygen by heating KClO3 in the presence of MnO2, only moderate heat is needed because the catalyst acts by

A. lowering the pressure of the reaction

B. increasing the surface area of the reactant

C. increase the rate of the reaction

D. lowering the energy barrier of the reaction

33. The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and

A. tricloromethane

B. dichloromethane

C. tetrachloromethane

D. chloromethane

34. One of the major uses of alkane is

A. as domestic and industrial fuel

B. in the hydrogenation of oils

C. in the textile industries

D. in the production of plastics

35. Two hydrocarbons X and Y were treated with bromine water. X decolorised the solution and Y did not not. Which class of compound does Y belong?

A. Benzene

B. Alkynes

C. Alkenes

D. Alkanes

36. The compound that is used as an anaesthetic is

A. CCl₄

B. CH Cl₃

C. CH₂Cl₂

D. CH₃Cl

37. How many atoms are present in 6.0g of magnesium?

[Mg = 24, NA = 6.02 x 10²³ mol-1]

A. 1.20 x 10²²

B. 2.41 x 10²²

C. 1.51 x 10²³

D. 3.02 x 10²³

38. 2H₂(g) + O₂(g) ➡ 2H₂O(g)

In the reaction above, what volume of hydrogen would be left over when 300cm³ of oxygen and 1000cm³ of hydrogen are exploded in a sealed tube?

A. 200 cm³

B. 400 cm³

C. 600 cm³

D. 700 cm³

39. Which of the following pollutants is associated with brain damage?

A. Carbon (ll) oxide

B. Radioactive fallout

C. Biodegradable waste

D. Sulphus (lV) oxide

40. The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its

A. basicity

B. acid strength

C. pH

D. concentration