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MCQOPTIONS
This section includes 1489 Mcqs, each offering curated multiple-choice questions to sharpen your 8th Class knowledge and support exam preparation. Choose a topic below to get started.
| 951. |
By which of the given processes is coal formed? |
| A. | Carbonization |
| B. | Distillation |
| C. | Vaporization |
| D. | Evaporation |
| Answer» B. Distillation | |
| 952. |
What is the splitting of a compound using electricity called? |
| A. | Electrolysis |
| B. | Electrolyte |
| C. | Electrokinesis |
| D. | Electrochemistry |
| Answer» B. Electrolyte | |
| 953. |
What is the lowest temperature at which a substance starts burning called? |
| A. | Minimum temperature |
| B. | Maximum temperature |
| C. | Boiling temperature |
| D. | Ignition temperature |
| Answer» E. | |
| 954. |
Rajesh made two paper cups I and II by folding a sheet of paper. He pours 50 mL water in cup II, and heats both cups separately with the help of a candle (as shown in the figure). Rajesh observes that while one paper cup burns readily, the other does not burn. He observed that paper cup ____i____ does not burn since its ignition temperature was ______ii______ while heating. The information in which alternative completes the given statement? |
| A. | i-I, ii-reached |
| B. | i-II, ii-reached |
| C. | i-I, ii-not reached |
| D. | i-I, ii-not reached |
| Answer» E. | |
| 955. |
Assertion (A): The resources are present in unlimited quantity in nature and are not likely to be exhausted by human activities are called Inexhaustible resources. Reason (R): Forests, wildlife, minerals are examples Inexhaustible resources. |
| A. | A is correct and R is the correct explanation of A. |
| B. | A is correct and R is not the correct explanation of A. |
| C. | A is correct and R is wrong. |
| D. | A is wrong and R is correct. |
| Answer» D. A is wrong and R is correct. | |
| 956. |
Which of the forms of coal has the highest percentage of carbon? |
| A. | Anthracite |
| B. | Bituminous |
| C. | Peat |
| D. | Lignite |
| Answer» B. Bituminous | |
| 957. |
A piece of paper wrapped around an aluminium pipe does not catch fire easily. Which of the following reasons supports the above information? |
| A. | Paper is non-combustible in nature |
| B. | Aluminium is non-combustible in nature |
| C. | Aluminium pipe does not attain its ignition temperature |
| D. | Paper wrapped around the pipe does not attain its ignition temperature |
| Answer» E. | |
| 958. |
Which of the following is the jellylike substance inside the plasma membrane in which all the cell organelles are found floating? |
| A. | Tonoplasm |
| B. | Cytoplasm |
| C. | Karyoplasm |
| D. | Cell sap |
| Answer» C. Karyoplasm | |
| 959. |
Which of the following statements are correct? (I) Coal, petroleum and natural gas are called fossil fuels. (II) Coal and natural gas are exhaustible substances. (III) CNG is more polluting than petrol. (IV) Coke is used in the manufacture of steel. |
| A. | I and II only |
| B. | II and IV only |
| C. | I, III and IV only |
| D. | I, II and IV only |
| Answer» E. | |
| 960. |
The given table lists some fuels with their calorific values: Fuel Calorific Value Diesel 45000 LPG 55000 Petrol 45000 Which of the given fuels is the most efficient? |
| A. | Petrol |
| B. | Diesel |
| C. | LPG |
| D. | CNG |
| Answer» D. CNG | |
| 961. |
Fill in the blanks left in the classification of the fossil fuels. |
| A. | p q u v w x Petroleum Coal Petroleum gas Bitumen Coal gas Coke |
| B. | p q u v w x Coal Petroleum Coal gas Coke Petroleum gas Bitumen |
| C. | p q u v w x Coal Petroleum gas Coal Charcoal Gasoline Coal tar |
| D. | p q u v w x Petroleum Coal Gasoline Bitumen Natural gas Coke |
| Answer» C. p q u v w x Coal Petroleum gas Coal Charcoal Gasoline Coal tar | |
| 962. |
Which of the following includes wildlife? |
| A. | All non-domesticated and non- cultivated biota in their natural habitat |
| B. | All domesticated and non- domesticated animals |
| C. | All cultivated plants and non- domesticated animals |
| D. | All non-cultivated plants and domesticated animals |
| Answer» B. All domesticated and non- domesticated animals | |
| 963. |
Match column I with column II and select the correct option from the codes given below. Column I Column II P. Rusting (i) Explosion Q. Burning of Paper (ii) Spontaneous combustion R. Sodium (iii) Rapid combustion S. Fire crackers (iv) Slow combustion |
| A. | P-(ii), Q-(iii), R-(i), S-(iv) |
| B. | P-(i), Q-(iii), R-(ii), S-(iv) |
| C. | P-(iii), Q-(ii), R-(i), S-(ii) |
| D. | P-(iv), Q-(iii), R-(ii), S-(i) |
| Answer» E. | |
| 964. |
Which of the following is in descending order of the quality of coal? |
| A. | Peat > bituminous > lignite > anthracite |
| B. | Bituminous > peat > lignite > anthracite |
| C. | Anthracite > bituminous > lignite > peat |
| D. | Lignite > anthracite > bituminous > peat |
| Answer» D. Lignite > anthracite > bituminous > peat | |
| 965. |
Which of the following reactions takes place in soda-acid type fire extinguisher? |
| A. | \[\text{CaC}{{\text{O}}_{3}}\xrightarrow{\Delta }CaO+C{{O}_{2}}\] |
| B. | \[2NaHC{{O}_{3}}\xrightarrow{\Delta }N{{a}_{2}}C{{O}_{3}}+{{H}_{2}}O+C{{O}_{2}}\] |
| C. | \[\begin{align} & 2NaHC{{O}_{3}}+{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}N{{a}_{2}}S{{O}_{4}} \\ & +2{{H}_{2}}O+2C{{O}_{2}} \\ \end{align}\] |
| D. | \[\begin{align} & \text{CaC}{{\text{O}}_{\text{3}}}\text{+}{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\xrightarrow{{}}\text{CaS}{{\text{O}}_{\text{4}}} \\ & \text{+}{{\text{H}}_{\text{2}}}\text{O+C}{{\text{O}}_{\text{2}}} \\ \end{align}\] |
| Answer» D. \[\begin{align} & \text{CaC}{{\text{O}}_{\text{3}}}\text{+}{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\xrightarrow{{}}\text{CaS}{{\text{O}}_{\text{4}}} \\ & \text{+}{{\text{H}}_{\text{2}}}\text{O+C}{{\text{O}}_{\text{2}}} \\ \end{align}\] | |
| 966. |
Which of the following control methods can restore balance in an ecosystem? |
| A. | Rain water harvesting for conservation and management of water |
| B. | Conservation of ocean resources and preservation of marine life |
| C. | Public awareness programmes concerning conservation of wild life |
| D. | All of these |
| Answer» E. | |
| 967. |
Hydrogen gas has the highest calorific value i.e., \[150\,kJ\,k{{g}^{-1}},\]yet it is not used as a fuel. Why? |
| A. | It is explosive in nature. |
| B. | It causes storage problem. |
| C. | It causes transportation problem. |
| D. | All of the above |
| Answer» E. | |
| 968. |
Which of the following is not a characteristic of a good fuel? |
| A. | It should be cheap and readily available |
| B. | It should have a high calorific value |
| C. | It should be environment friendly |
| D. | It should bum at a slow rate in air |
| Answer» E. | |
| 969. |
Which of the following is the small rod shaped structure bound by a double membrane which helps in the oxidation of food to release energy? |
| A. | Mitochondrion |
| B. | Golgi complex |
| C. | Nucleus |
| D. | Vacuole |
| Answer» B. Golgi complex | |
| 970. |
Which of the following statements about fossil fuels is correct? |
| A. | Only petroleum is prepared in the laboratory |
| B. | Petrochemicals are products of coal and petroleum |
| C. | Both coal and petroleum are prepared in the laboratory |
| D. | Petrochemicals are products of petroleum and natural gas |
| Answer» E. | |
| 971. |
The given figure shows the petroleum deposit inside the earth's crust. Which of the following is correct with respect to substance X?I. X is chiefly made up of methane.II. X is stored under low pressure.III. X is a clean, non-polluting fuel. |
| A. | I and III |
| B. | II and III |
| C. | I and II |
| D. | None of these |
| Answer» B. II and III | |
| 972. |
Select the incorrect differences between national park and sanctuary. National Park Sanctuary (i) It is meant for protection of both flora and fauna. It is meant for protection of only fauna. (ii) Grazing is allowed. Grazing is not allowed. (iii) Private ownership is not permitted. Private ownership is permitted. |
| A. | (i) and (iii) only |
| B. | (i) and (iv) only |
| C. | (ii) and (iii) only |
| D. | (ii) only |
| Answer» E. | |
| 973. |
What is the disadvantage of incomplete combustion of a fuel? |
| A. | Unburnt carbon gets released. |
| B. | Air gets polluted. |
| C. | Respiratory problems arise. |
| D. | All of the above |
| Answer» E. | |
| 974. |
Sujit was performing an experiment in the laboratory. He collected four substances I, II, III, and IV and kept all of them in contact with air at room temperature. He observed that substance III suddenly bursts into flames. Then, he heated I, II, and IV and found out that while I and II catch fire, substance IV does not. However, substance IV catches fire on prolonged heating. Which substance undergoes spontaneous combustion in Sujit's experiment? |
| A. | I |
| B. | II |
| C. | III |
| D. | IV |
| Answer» D. IV | |
| 975. |
Destructive distillation of coal is carried out by heating coal strongly to \[\text{1000 }\!\!{}^\circ\!\!\text{ C}\] in the absence of air. The various useful products obtained are |
| A. | Crude oil, kerosene, naphtha and heavy oil |
| B. | Coke, coal gas, coal tar and ammonium compounds |
| C. | Coal gas, petroleum gas and lignite |
| D. | None of these. |
| Answer» C. Coal gas, petroleum gas and lignite | |
| 976. |
Which of the following cell organelles are respectively called suicidal bags and power houses of the cell? |
| A. | Mitochondria and lysosomes. |
| B. | Lysosomes and mitochondria. |
| C. | Lysosomes and Golgi complex. |
| D. | Golgi complex and lysosomes. |
| Answer» C. Lysosomes and Golgi complex. | |
| 977. |
In LPG cylinder, how is the gas liquified? |
| A. | By increasing volume |
| B. | By applying high pressure |
| C. | By increasing temperature |
| D. | By reducing pressure |
| Answer» C. By increasing temperature | |
| 978. |
Which of the following substances is not required for combustion? |
| A. | \[{{O}_{2}}\] |
| B. | \[C{{O}_{2}}\] |
| C. | Fuel |
| D. | Heat |
| Answer» C. Fuel | |
| 979. |
Following is the data of four species \[({{S}_{1}}-{{S}_{4}})\] present (+) or absent (-) in five different habitats (P, Q, R, S and T). Which species has the maximum diversity? |
| A. | \[{{\text{S}}_{1}}\] |
| B. | \[{{\text{S}}_{2}}\] |
| C. | \[{{\text{S}}_{3}}\] |
| D. | \[{{\text{S}}_{4}}\] |
| Answer» C. \[{{\text{S}}_{3}}\] | |
| 980. |
Why are LED?s extensively used to replace bulbs? (i) Consume less electricity (ii) Have longer life (iii) Have more power |
| A. | Only (i) and (ii) |
| B. | Only (ii) and (iii) |
| C. | Only (i) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 981. |
The total amount of heat produced by a fuel having a calorific value of 20 kJ kg 1 was found to be 50,000 joules. How much fuel was burnt? |
| A. | 2500 kg |
| B. | 250 kg |
| C. | 25 kg |
| D. | 2.5 kg |
| Answer» E. | |
| 982. |
A family consumes 12 kg of L.P.G. in 30 days. Calculate the average energy consumed per day, if the calorific value of L.P.G. is 50 kJ kg1. |
| A. | 10,000 J per day |
| B. | 15,000 J per day |
| C. | 20,000 J per day |
| D. | 25,000 J per day |
| Answer» D. 25,000 J per day | |
| 983. |
The slow process of the transition of dead ____i____ into coal is called ______ii_____. The information in which alternative completes the given statement? |
| A. | i-vegetation, ii-condensation |
| B. | i-vegetation, ii-carbonization |
| C. | i-sea organisms, ii-carbonization |
| D. | i-sea organisms, ii-condensation |
| Answer» C. i-sea organisms, ii-carbonization | |
| 984. |
Assertion (A): Coal, petroleum and natural gas be prepared in the laboratory from dead organisms. Reason (R): They cannot be prepared in laboratory as their formation is a very slow process and conditions for their formation cannot be created in the laboratory. |
| A. | A is correct and R is the correct explanation of A. |
| B. | A is correct and R is not the correct explanation of A |
| C. | A is correct and R is wrong. |
| D. | A is wrong and R is correct. |
| Answer» C. A is correct and R is wrong. | |
| 985. |
Which of the following materials does not bum with. a flame? |
| A. | Kerosene |
| B. | Camphor |
| C. | Wood |
| D. | Wax |
| Answer» E. | |
| 986. |
Red blood cells do not have: (i) Cell membrane (ii) Cytoplasm (iii) Plastid (iv) Nucleus |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (iii) and (iv) |
| D. | (i) and (iv) |
| E. | None of these |
| Answer» D. (i) and (iv) | |
| 987. |
Which of the following is a saclike structure that store food, wastes and water? |
| A. | Lysosomes |
| B. | Centrosomes |
| C. | Chromosomes |
| D. | Vacuoles |
| Answer» E. | |
| 988. |
Which of the following is the biodiversity hot spot? |
| A. | Oceans |
| B. | Rivers |
| C. | Deserts |
| D. | Forests |
| Answer» E. | |
| 989. |
Assertion (A): The slow process of conversion of dead vegetation into coal is called catenation. Reason (R): When heated in air, coal burns and produces mainly carbon dioxide gas. |
| A. | A is correct and R is the correct explanation of A. |
| B. | A is correct and R is not the correct explanation of |
| C. | A is correct and R is wrong. |
| D. | A is wrong and R is correct. |
| Answer» E. | |
| 990. |
Different components of petroleum are separated by fractional distillation. What is the correct sequence of fractions obtained in the fractionating column from top to bottom? |
| A. | Petroleum gas, lubricating oil, kerosene, gasoline. |
| B. | Kerosene, petroleum gas, lubricating oil, gasoline. |
| C. | Petroleum gas, gasoline, kerosene, lubricating oil. |
| D. | Gasoline, kerosene, petroleum gas, lubricating oil. |
| Answer» D. Gasoline, kerosene, petroleum gas, lubricating oil. | |
| 991. |
What are the two main hydrocarbons present in L.P.G.? |
| A. | Butane + propane |
| B. | Butane + isobutene |
| C. | Propane + ethane |
| D. | Methane + ethane |
| Answer» B. Butane + isobutene | |
| 992. |
What is combustion? |
| A. | An exothermic reaction |
| B. | An endothermic reaction |
| C. | A displacement reaction |
| D. | A reduction reaction |
| Answer» B. An endothermic reaction | |
| 993. |
What is the underlying principle based on which fractional distillation is carried out? |
| A. | Different densities of each fraction |
| B. | Different molecular weights of each fraction |
| C. | Different boiling points of each fraction |
| D. | Different melting points of each fraction |
| Answer» D. Different melting points of each fraction | |
| 994. |
Which of the following saclike structures help in the synthesis and storage of many substances? |
| A. | Endoplasmic reticulum |
| B. | Nucleus |
| C. | Mitochondria |
| D. | Golgi bodies |
| Answer» E. | |
| 995. |
4.120 kg of a fuel was burnt to produce 178000 kJ of energy. The calorific value (in kJ/kg) of the fuel is |
| A. | \[4.3203\times {{10}^{4}}\] |
| B. | \[4.3203\times {{10}^{3}}\] |
| C. | \[4.3203\times {{10}^{2}}\] |
| D. | \[4.3203\times {{10}^{1}}\] |
| Answer» B. \[4.3203\times {{10}^{3}}\] | |
| 996. |
In an experiment, 4.5 kg of a fuel was completely burnt. The heat produced was 180,000 kJ. The calorific value of the fuel is |
| A. | 180,000 kJ |
| B. | 40,000 kJ |
| C. | 40,000 kJ/kg |
| D. | 180,000 kJ/kg |
| Answer» D. 180,000 kJ/kg | |
| 997. |
A substance X is obtained from an exhaustible natural resource. It is a black and thick liquid with an unpleasant smell. It is a mixture of 175" 200 substances. Some of the products such as synthetic dyes, plastic paints, explosives, perfumes, etc are obtained using this resource. The substance X is |
| A. | Coke |
| B. | Coal tar |
| C. | Bitumen |
| D. | Lubricating oil |
| Answer» C. Bitumen | |
| 998. |
Read the following statements carefully.X: It is a fossil fuel used in thermal power plants to produce electricity.Y: It is a porous, black and almost pure form of carbon.Z: It is a mixture of about 200 substances. X, Y and Z are respectively |
| A. | Petroleum, coal gas, coke |
| B. | Coal, coke, coal tar |
| C. | CNG, bitumen, diesel |
| D. | Coal gas, petrol, paraffin wax. |
| Answer» C. CNG, bitumen, diesel | |
| 999. |
What is the major difference between a human skin cell and a human egg cell? |
| A. | The egg cell has twice as many chromosomes as the skin cell. |
| B. | The egg cell has half as many chromosomes as the skin cell. |
| C. | The skin cell has no genetic information in its chromosomes. |
| D. | Only the egg cell has a nucleus. |
| Answer» C. The skin cell has no genetic information in its chromosomes. | |
| 1000. |
Which of the following is an example of rapid combustion? |
| A. | Candle |
| B. | Cracker |
| C. | White phosphorus |
| D. | Sulphur |
| Answer» B. Cracker | |