MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The cooling pack which treat a sports injury is kneaded with water and |
| A. | Ammonium chloride crystals |
| B. | calcium chloride crystals |
| C. | Ammonium dioxide crystals |
| D. | nitrogen |
| Answer» B. calcium chloride crystals | |
| 2. |
Energy conservation mechanisms do not include |
| A. | insulating lofts with pylons |
| B. | insulating cavity walls with polyurethane |
| C. | double glazing windows |
| D. | prevention of heat loss |
| Answer» B. insulating cavity walls with polyurethane | |
| 3. |
The production of energy in fuel cell as compare to petrol engine is considerably |
| A. | high |
| B. | low |
| C. | same |
| D. | constant |
| Answer» B. low | |
| 4. |
Cells with a size of the button are used in |
| A. | heart pacemakers only |
| B. | hearing aids only |
| C. | dialyzer |
| D. | heart pacemakers and hearing aids |
| Answer» E. | |
| 5. |
Incorrect statement is: Mineral acids... |
| A. | have simpler molecular structures. |
| B. | are more corrosive. |
| C. | commonly found in nature. |
| D. | are man made. |
| Answer» D. are man made. | |
| 6. |
Lattice energy becomes more exothermic if the size of ion is |
| A. | increased |
| B. | lowered |
| C. | decreased |
| D. | stable |
| Answer» B. lowered | |
| 7. |
A mole of liquid can be converted into a mole of gas by |
| A. | breaking the bond energy |
| B. | increasing the catalyst |
| C. | reaching the enthalpy change of vaporization |
| D. | decreasing catalyst |
| Answer» D. decreasing catalyst | |
| 8. |
Methane (CH₄) is better fuel than Coal gas because |
| A. | it is endothermic |
| B. | it is exothermic |
| C. | it gives off more heat than coal gas |
| D. | it requires very little oxygen to burn |
| Answer» D. it requires very little oxygen to burn | |
| 9. |
The surface area to come in contact with the neighboring molecules is smaller in |
| A. | 2,2 dimethyl propane |
| B. | pentane |
| C. | Methane |
| D. | ethane |
| Answer» B. pentane | |
| 10. |
Upon heating either of carbonate, hydroxide or nitrate, a common byproduct is |
| A. | Heat |
| B. | water vapors |
| C. | oxides of same compounds |
| D. | carbon dioxide |
| Answer» D. carbon dioxide | |
| 11. |
The French scientists Lavoisier and Laplace first detected the amount of heat by using |
| A. | specific calorimeter |
| B. | ice calorimeter |
| C. | solute calorimeter |
| D. | solvent calorimeter |
| Answer» C. solute calorimeter | |
| 12. |
An electrochemical cell in which fuel gives up electrons at one electrode and oxygen gain electrons at another electrode is known as |
| A. | fuel cell |
| B. | electrolytic cell |
| C. | oxygen cell |
| D. | electron cell |
| Answer» B. electrolytic cell | |
| 13. |
Boiling point becomes higher due to increase in the |
| A. | Van der Waals' forces only |
| B. | number of electrons only |
| C. | number of protons |
| D. | Van der Waals' forces and number of electrons |
| Answer» E. | |
| 14. |
An efficient source of electricity production is |
| A. | to combine hydrogen and oxygen to form water |
| B. | to drive generators through steam |
| C. | to combine nitrogen with hydrogen |
| D. | both a and b |
| Answer» B. to drive generators through steam | |
| 15. |
Nickel cadmium cells are |
| A. | smaller |
| B. | low voltage supplier |
| C. | high voltage supplier |
| D. | a and c |
| Answer» E. | |
| 16. |
LPG stands for |
| A. | liquefied purified gas |
| B. | liquefied patrol gas |
| C. | liquefied petroleum gas |
| D. | latent petroleum gas |
| Answer» D. latent petroleum gas | |
| 17. |
Which statement is incorrect? |
| A. | boiling point is independent of the number of contact points |
| B. | boiling point depends upon the number of electrons |
| C. | boiling point depends upon the number of protons |
| D. | boiling point is dependent on number of neutrons |
| Answer» B. boiling point depends upon the number of electrons | |
| 18. |
Chemical reaction with oxygen is called |
| A. | oxidation |
| B. | activation |
| C. | combustion |
| D. | reduction |
| Answer» D. reduction | |
| 19. |
Meals can be heated up when camping by the help of |
| A. | self heating food box |
| B. | auto heating food box |
| C. | temporary heating food box |
| D. | manual heating food box |
| Answer» B. auto heating food box | |
| 20. |
Burning of glucose produces heat and |
| A. | carbon dioxide (gas) |
| B. | water (gas) |
| C. | oxygen (gas) |
| D. | both a and b |
| Answer» E. | |
| 21. |
The flow of electrons (e⁻) through external circuit in cars provides energy to |
| A. | drive |
| B. | ignite |
| C. | combustion |
| D. | none of above |
| Answer» B. ignite | |
| 22. |
In button cells, the negative pole is made up of |
| A. | zinc only |
| B. | lithium only |
| C. | silver |
| D. | zinc and lithium |
| Answer» E. | |
| 23. |
One of the given compounds with the same number of electrons have a lower boiling point, that compound is |
| A. | 2,2 dimethyl propane |
| B. | pentane |
| C. | hexane |
| D. | butene |
| Answer» B. pentane | |
| 24. |
In an equation, the positive sign (+ΔH) indicates that the reaction is |
| A. | endothermic |
| B. | exothermic |
| C. | ectothermic |
| D. | hypothermic |
| Answer» B. exothermic | |
| 25. |
The symbol for enthalpy is |
| A. | E |
| B. | H |
| C. | P |
| D. | Y |
| Answer» C. P | |
| 26. |
A secondary cell used in a car battery is composed of plates of |
| A. | lead only |
| B. | lead oxide only |
| C. | lead sulfate |
| D. | lead and lead oxide |
| Answer» E. | |
| 27. |
The oxidation of food in our body keeps us |
| A. | warm |
| B. | strong |
| C. | active |
| D. | none of above |
| Answer» B. strong | |
| 28. |
The lower boiling point of 2,2 dimethyl propane can be attributed to |
| A. | number of electrons |
| B. | lining up of molecules |
| C. | compact molecular structure |
| D. | more contact points |
| Answer» D. more contact points | |
| 29. |
In Van der Waal's forces, forces of attraction are formed between |
| A. | σ+ of dipole of one atom/molecule and σ− of dipole of next atom/molecule |
| B. | π+ of dipole of one atom/molecule and π− of dipole of next atom/molecule |
| C. | δ+ of dipole of one atom/molecule and δ− of dipole of next atom/molecule |
| D. | none of above |
| Answer» D. none of above | |
| 30. |
Isolated atoms are found in |
| A. | metals |
| B. | non-metals |
| C. | transition metals |
| D. | noble gases |
| Answer» E. | |
| 31. |
Whenever there is an occurrence of chemical reaction there lies a change in |
| A. | heat |
| B. | light |
| C. | energy |
| D. | none of above |
| Answer» D. none of above | |
| 32. |
The change in the energy between a chemical reaction and the surroundings at constant temperature is called |
| A. | enthalpy change |
| B. | enthalpy |
| C. | enthalpy profile |
| D. | dynamic enthalpy |
| Answer» B. enthalpy | |
| 33. |
Fireworks release energy in the form of |
| A. | heat |
| B. | light |
| C. | sound |
| D. | all of above |
| Answer» E. | |
| 34. |
Under thermal decomposition, copper nitrate gets converted into |
| A. | Copper oxide |
| B. | Nitrogen oxide |
| C. | Oxygen |
| D. | all of the above |
| Answer» E. | |
| 35. |
Thermal decomposition does not occur in |
| A. | carbonates |
| B. | hydroxides |
| C. | sulphates |
| D. | nitrates |
| Answer» D. nitrates | |
| 36. |
In an endothermic reaction, |
| A. | more light is produced |
| B. | chemical bonds are formed |
| C. | a lot of steam is produced |
| D. | products contain more energy than the reactants |
| Answer» E. | |
| 37. |
The endothermic chemical reaction absorbs energy from |
| A. | surrounding |
| B. | inside |
| C. | reactants |
| D. | products |
| Answer» B. inside | |
| 38. |
Burning of hydrogen |
| A. | is an endothermic reaction |
| B. | acts as fuel in rockets etc. |
| C. | is fatal for plant habitats |
| D. | results in acid rains |
| Answer» C. is fatal for plant habitats | |
| 39. |
Anhydrous calcium chloride (CaCl₂) and water (H₂O) react together to heat the food by |
| A. | endothermic |
| B. | exothermic |
| C. | ectothermic |
| D. | hypothermic |
| Answer» C. ectothermic | |
| 40. |
The chemical reactions which emit energy to surroundings are called |
| A. | endothermic |
| B. | exothermic |
| C. | ectothermic |
| D. | hypothermic |
| Answer» C. ectothermic | |
| 41. |
In ionic crystals, heat energy is taken in to |
| A. | form carbonates |
| B. | form sulphates |
| C. | break crystal lattices |
| D. | to form covalent bonds |
| Answer» D. to form covalent bonds | |
| 42. |
In 1748, the first time the word used in connection with electricity was |
| A. | battery |
| B. | charge |
| C. | electrode |
| D. | none of above |
| Answer» B. charge | |
| 43. |
Energy changes in a chemical reaction can be represented through |
| A. | energy profile diagram |
| B. | energy prolific graph |
| C. | Sensors |
| D. | data loggers |
| Answer» B. energy prolific graph | |
| 44. |
To increase the temperature of 1 g of water by 1 °C, it requires energy equal to |
| A. | 4.18J |
| B. | 4.81J |
| C. | 4.21J |
| D. | 4.12J |
| Answer» B. 4.81J | |
| 45. |
Number of contact points are more in |
| A. | 2,2 dimethyl propane |
| B. | pentane |
| C. | ethane |
| D. | methane |
| Answer» C. ethane | |
| 46. |
If NaOH(aq) reacts with HCl(aq), reaction can be known as |
| A. | combustion |
| B. | Thermal decomposition |
| C. | Neutralization |
| D. | Respiration |
| Answer» D. Respiration | |
| 47. |
Kilojoules per mole are the unit of |
| A. | bond energy |
| B. | enthalpy change |
| C. | density |
| D. | volume |
| Answer» C. density | |
| 48. |
The attraction of intermolecular forces between molecules is known as |
| A. | Van der Waal's forces |
| B. | covalent bonding |
| C. | repulsion force |
| D. | hydrogen bonding |
| Answer» D. hydrogen bonding | |
| 49. |
Exothermic reactions does not include |
| A. | upon heating, hydrogen results in water |
| B. | neutralization of acids and alkalis |
| C. | respiration |
| D. | breaking of chemical bond |
| Answer» E. | |
| 50. |
Upon burning, Hydrogen (H₂) forms |
| A. | water vapors |
| B. | hydrogen oxide |
| C. | hydrogen ions |
| D. | hydrocarbon |
| Answer» B. hydrogen oxide | |