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MCQOPTIONS
This section includes 6820 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 1701. |
Why is sodium bicarbonate used as a fire extinguisher? |
| A. | By receiving the heat of the fire, it generates CO₂ gas. |
| B. | By receiving the heat of the fire, it generates CO gas. |
| C. | By receiving the heat of the fire, it generates O₂ gas. |
| D. | By receiving the heat of the fire, it generates water. |
| Answer» B. By receiving the heat of the fire, it generates CO gas. | |
| 1702. |
in petrol? |
| A. | carbon, air |
| B. | life, life |
| C. | nitrogen, vitality |
| D. | carbon, hydrogen |
| Answer» E. | |
| 1703. |
The sodium bicarbonate solution in fire extinguishers reacts with which to form carbon dioxide? |
| A. | nitric acid |
| B. | sulfuric acid |
| C. | acetic acid |
| D. | carbolic acid |
| Answer» C. acetic acid | |
| 1704. |
The water of burning petrol cannot be extinguished, because . . . |
| A. | Combustion of petrol and water produces a flammable chemical. |
| B. | Burning petrol turns water into steam instantly. |
| C. | Petrol floats on water because of its relative low density. |
| D. | Water on contact with burning petrol releases oxygen which helps in burning. |
| Answer» D. Water on contact with burning petrol releases oxygen which helps in burning. | |
| 1705. |
The process of combustion in which heat and light are produced in a short time is called? |
| A. | quick combustion |
| B. | slow combustion |
| C. | self combustion |
| D. | explosion |
| Answer» B. slow combustion | |
| 1706. |
What is the full form of LPG? |
| A. | liquefied petroleum gas |
| B. | liquefied petroleum gas |
| C. | Leaded petroleum gas |
| D. | low petroleum gas |
| Answer» C. Leaded petroleum gas | |
| 1707. |
Liquefied mixture of normal butane and isobutane is called? |
| A. | water gas |
| B. | coal gas |
| C. | producer gas |
| D. | liquefied petroleum gas |
| Answer» E. | |
| 1708. |
What are the necessary conditions for the process of combustion? |
| A. | presence of combustible material |
| B. | presence of combustion nutrients |
| C. | Acquisition of combustion heat |
| D. | all of the above |
| Answer» E. | |
| 1709. |
What causes the most pollution? |
| A. | nitrogen |
| B. | O₂ |
| C. | CO |
| D. | CO₂ |
| Answer» D. CO₂ | |
| 1710. |
Which one is not a fossil fuel or is not obtained from fossil fuel? |
| A. | lpg |
| B. | natural gas |
| C. | bio gas |
| D. | C . N. G. |
| Answer» D. C . N. G. | |
| 1711. |
Which of the following fossil fuels is the cleanest fuel? |
| A. | Coal |
| B. | petrol |
| C. | natural gas |
| D. | diesel |
| Answer» D. diesel | |
| 1712. |
Natural gas mainly resides in? |
| A. | methane |
| B. | ethane |
| C. | propane |
| D. | butane |
| Answer» B. ethane | |
| 1713. |
Which of the following is organic acid? |
| A. | citric acid |
| B. | Sulfuric Acid (Odor Acid) |
| C. | nitric acid |
| D. | phosphoric acid |
| Answer» B. Sulfuric Acid (Odor Acid) | |
| 1714. |
The two major fungal diseases found on wheat are? |
| A. | black kitt and smut |
| B. | White Kitt and Smut |
| C. | smut and full - crunch |
| D. | Black Kitt and White Kitt |
| Answer» B. White Kitt and Smut | |
| 1715. |
Bauxite is the raw metal of? |
| A. | Iron |
| B. | zinc |
| C. | tin |
| D. | Aluminum |
| Answer» E. | |
| 1716. |
Liquefied petroleum gas (LPG) is a mixture of? |
| A. | butane, hydrogen and methane |
| B. | butane, propane and ethane |
| C. | Oxygen, Hydrogen, Acetylene |
| D. | Hydrogen, Methane and Oxygen |
| Answer» C. Oxygen, Hydrogen, Acetylene | |
| 1717. |
If a product acts as a catalyst in a reaction, then it is called? |
| A. | homogeneous trigger |
| B. | heterogeneous trigger |
| C. | self trigger |
| D. | induced trigger |
| Answer» D. induced trigger | |
| 1718. |
What is the catalytic enhancer in Haber method of ammonia production? |
| A. | Nickel |
| B. | Iron |
| C. | Platinum |
| D. | molybdenum |
| Answer» E. | |
| 1719. |
Water is a compound because . . |
| A. | It is found in all three forms solid, liquid and gas. |
| B. | It contains hydrogen and oxygen. |
| C. | It consists of two different elements linked by chemical bonds. |
| D. | It can be broken down into two simpler substances by chemical means. |
| Answer» D. It can be broken down into two simpler substances by chemical means. | |
| 1720. |
In ordinary fire extinguishers, CO₂ is produced by the reaction of |
| A. | limestone and dilute sulfuric acid |
| B. | marble and dilute acid |
| C. | sodium bicarbonate and dilute sulfuric acid |
| D. | Acid of sodium carbonate and dilute salt |
| Answer» D. Acid of sodium carbonate and dilute salt | |
| 1721. |
Which one of the following fuels is used for gas-welding? |
| A. | lpg |
| B. | ethylene |
| C. | methane |
| D. | acetylene |
| Answer» E. | |
| 1722. |
biological catalyst? |
| A. | amino acids |
| B. | C₆H₁₂O₆ |
| C. | N₂ |
| D. | Enzyme |
| Answer» E. | |
| 1723. |
Does the booster work? |
| A. | by increasing the surface energy of the catalyst |
| B. | making the surface of the catalyst better |
| C. | By making the surface of the catalyst smoother than before |
| D. | By increasing the rate of analysis of page packages |
| Answer» C. By making the surface of the catalyst smoother than before | |
| 1724. |
What will be the mean intensity in interference pattern obtained from two phase related sources of same intensity Iₒ? |
| A. | Iₒ |
| B. | 2Iₒ |
| C. | 4Iₒ |
| D. | Zero |
| Answer» C. 4Iₒ | |
| 1725. |
In which process vanadium penta oxide is used as a catalyst? |
| A. | contact process |
| B. | Haber process |
| C. | Solvay Process |
| D. | sis chamber process |
| Answer» B. Haber process | |
| 1726. |
How does a catalytic toxin work? |
| A. | Does a chemical act with a catalyst? |
| B. | By combining with free valencies on the catalyst surface |
| C. | by mixing with a reactant |
| D. | by coagulating the catalyst |
| Answer» E. | |
| 1727. |
What is the correct group of gases related to green planet effect? |
| A. | CH₄ , SO₂ , SO₃ |
| B. | CH₃ , SO₄ , SO₂ |
| C. | C . F . C . , CO , ONLY |
| D. | CH₄ , CO₂ , SO₂ |
| Answer» D. CH₄ , CO₂ , SO₂ | |
| 1728. |
What is the same number of gases in the same volume of different gases under the same conditions of temperature and pressure? |
| A. | of nuclear |
| B. | of molecule |
| C. | of origin |
| D. | of electron |
| Answer» C. of origin | |
| 1729. |
What is the main gas produced in animal and plant waste? |
| A. | in athen |
| B. | in methane |
| C. | in propane |
| D. | in acetylene |
| Answer» C. in propane | |
| 1730. |
The speed of diffusion of CO₂ is less than that of air, because it is faster than air. . . |
| A. | is lighter |
| B. | is heavy. |
| C. | it was very light |
| D. | is quite heavy |
| Answer» C. it was very light | |
| 1731. |
What will be the volume of 22 grams of CO₂ at NTP? |
| A. | 22. 4 liters |
| B. | 11. 2 liters |
| C. | 44. 8 liters |
| D. | 2 . 24 liters |
| Answer» B. 11. 2 liters | |
| 1732. |
Which gas is involved in air pollution? |
| A. | oxygen |
| B. | Carbon - Mono - Oxide |
| C. | hydrogen |
| D. | Carbon dioxide |
| Answer» C. hydrogen | |
| 1733. |
The necessary condition for the diffusion of gases is that there is a chemical reaction between them? |
| A. | possible |
| B. | not possible |
| C. | be slow |
| D. | be fast |
| Answer» C. be slow | |
| 1734. |
All gases gain volume when the temperature is |
| A. | 273℃ |
| B. | 27 . 3℃ |
| C. | - 273℃ |
| D. | 0℃ |
| Answer» D. 0℃ | |
| 1735. |
Which gas is used in flying balloons? |
| A. | oxygen |
| B. | hydrogen |
| C. | nitrogen |
| D. | helium |
| Answer» E. | |
| 1736. |
The molecular formula of propane is C₃H₈, it contains? |
| A. | 9 covalent bonds |
| B. | 10 covalent bonds |
| C. | 8 covalent bonds |
| D. | 11 covalent bonds |
| Answer» C. 8 covalent bonds | |
| 1737. |
Which of the following is the weakest Lewis base? |
| A. | OH⁻ |
| B. | H⁻ |
| C. | HCO₃⁻ |
| D. | Cl⁻ |
| Answer» E. | |
| 1738. |
What are the two atoms bonded to in an oxygen molecule? |
| A. | a bond |
| B. | two bonds |
| C. | three bonds |
| D. | four bonds |
| Answer» C. three bonds | |
| 1739. |
What is mainly contained in biogas? |
| A. | methane |
| B. | athene |
| C. | butane |
| D. | Carbon dioxide |
| Answer» B. athene | |
| 1740. |
What is the inert gas substituted for nitrogen gas in the air which is used by deep sea divers? |
| A. | neon |
| B. | krypton |
| C. | argon |
| D. | helium |
| Answer» E. | |
| 1741. |
What is the use of the law of diffusion of gases? |
| A. | in separating isotopes |
| B. | In determining the vapor density of gases |
| C. | separating a mixture of gases |
| D. | in all of the above |
| Answer» E. | |
| 1742. |
When the sky is seen from a high altitude from an aircraft, it is visible? |
| A. | Blue |
| B. | Black |
| C. | White |
| D. | Red |
| Answer» C. White | |
| 1743. |
Which of the following gases can cause acid rain? |
| A. | CO₂ |
| B. | CO |
| C. | SO₂ |
| D. | CH₄ |
| Answer» D. CH₄ | |
| 1744. |
The aqueous of copper sulphate is acidic in nature because the salt contains? |
| A. | dialysis |
| B. | electrolysis |
| C. | hydrolysis |
| D. | Photolysis |
| Answer» D. Photolysis | |
| 1745. |
All acids dissolve in water and give? |
| A. | OH ion |
| B. | H⁺ ion |
| C. | electron |
| D. | neutron |
| Answer» C. electron | |
| 1746. |
What is the pH value of acidic solution? |
| A. | 7 |
| B. | less than 7 |
| C. | over 7 |
| D. | 14 |
| Answer» C. over 7 | |
| 1747. |
What is the p-h value of neutral solution? |
| A. | less than 7 |
| B. | 7 these more |
| C. | 7 |
| D. | 14 |
| Answer» D. 14 | |
| 1748. |
What is the p-h value of milk? |
| A. | 6 . 1 |
| B. | 6 . 6 |
| C. | 7 . 4 |
| D. | 8 |
| Answer» C. 7 . 4 | |
| 1749. |
Which gas is produced by all acids reacting with metals? |
| A. | hydrogen |
| B. | nitrogen |
| C. | oxygen |
| D. | chlorine |
| Answer» B. nitrogen | |
| 1750. |
Where are the enzymes required for the Krebs cycle located? |
| A. | in the matrix of mitochondria |
| B. | In Christie's of Mitochondria |
| C. | on the inner surface of the outer membrane of mitochondria |
| D. | on the outer surface of the inner membrane of mitochondria |
| Answer» B. In Christie's of Mitochondria | |