MCQOPTIONS
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MCQOPTIONS
This section includes 2539 Mcqs, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1251. |
Greenhouse effect is caused due to ______. |
| A. | UV rays |
| B. | IR rays |
| C. | Cosmic rays |
| D. | Microwaves |
| Answer» C. Cosmic rays | |
| 1252. |
1. A student fitted the required apparatus to collect carbondioxide in the gas jars.2. The student took out some substance from the bottle labelled calcium carbonate and put it in the woulfe's bottle.3. Then the student poured some from the bottle labelled dilute hydrochloric acid on the calcium carbonate contained in the woulfe's bottle.4. considering the above mentioned facts maximum how many hypotheses are possible relating to the causes of non-collection of the gas in the gas jar? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» B. Two | |
| 1253. |
Match List-I with List-II and select the correct answer using the code given below the lists :List-IList-IIi) PVCa) Thermosetting polymerii) Bakeliteb) Thermoplastic polymeriii) Vulcanized rubberc) Fibreiv) Nylon 6d) Elastomers |
| A. | (i) - (d) (ii) - (b) (iii) - (a) (iv) - (c) |
| B. | (i) - (b) (ii) - (a) (iii) - (d) (iv) - (c) |
| C. | (i) - (a) (ii) - (b) (iii) - (c) (iv) - (d) |
| D. | (i) - (b) (ii) - (a) (iii) - (c) (iv) - (d) |
| Answer» C. (i) - (a) (ii) - (b) (iii) - (c) (iv) - (d) | |
| 1254. |
Dinitrogen (N2) and dioxygen (O2) are the main constituents of air but they do not react with each other to form oxides of nitrogen because |
| A. | the reaction requires initiation by a catalyst |
| B. | oxides of nitrogen are unstable |
| C. | the reaction is endothermic and requires very high temperature |
| D. | the stoichiometry of N2 and O2 in air is not ideal for the reaction to take place |
| Answer» D. the stoichiometry of N2 and O2 in air is not ideal for the reaction to take place | |
| 1255. |
Four gases A,B, C, D have Henry’s law constants 3, 4, 5, 6 respectively. Maximum solubility of the gas in the liquid is found in: |
| A. | It is the same for all |
| B. | B |
| C. | A |
| D. | D |
| Answer» D. D | |
| 1256. |
Quartz crystals used in clocks are? |
| A. | Sodium silicate |
| B. | Silicon dioxide |
| C. | Germanium dioxide |
| D. | Titanium dioxide |
| E. | None of the above / More than one above. |
| Answer» C. Germanium dioxide | |
| 1257. |
How many moles are present in 60 g Helium of ? |
| A. | 12 moles |
| B. | 15 moles |
| C. | 10 moles |
| D. | 25 moles |
| Answer» C. 10 moles | |
| 1258. |
50 mL of 0.5 m oxalic acid is needed to neutralise 25 mL of sodium hydroxide solution. The amount of NaOH in 50 mL of the given sodium hydroxide solution is |
| A. | 40 g |
| B. | 80 g |
| C. | 20 g |
| D. | 10 g |
| Answer» B. 80 g | |
| 1259. |
Nitrogen is used to flush food items to remove________. |
| A. | chlorine |
| B. | oxygen |
| C. | hydrogen |
| D. | water |
| Answer» C. hydrogen | |
| 1260. |
Atomic number of which of the following elements is greater than that of Bromine |
| A. | Silver |
| B. | Copper |
| C. | Iron |
| D. | Chromium |
| Answer» B. Copper | |
| 1261. |
Non-reducing sugar among the following is: |
| A. | Glucose |
| B. | Sucrose |
| C. | Maltose |
| D. | Lactose |
| Answer» C. Maltose | |
| 1262. |
Metals produce ringing sound when it another metal because they are __________. |
| A. | Malleable |
| B. | Ductile |
| C. | Sonorous |
| D. | Lustrous |
| Answer» D. Lustrous | |
| 1263. |
Pd has exceptional configuration 4d10 5s2, it belongs to- |
| A. | 4th Period |
| B. | 6th Period |
| C. | 7th Period |
| D. | 5th Period |
| Answer» E. | |
| 1264. |
Baking soda is used ______.I. for making baking powderII. in soda-acid fire extinguishersIII. to neutralize excess acid in the stomach |
| A. | Only I and II |
| B. | Only I and III |
| C. | Only II and III |
| D. | All I, II and III |
| Answer» E. | |
| 1265. |
How many elements were known when Mendeleev started his work? |
| A. | 66 |
| B. | 63 |
| C. | 64 |
| D. | 65 |
| Answer» C. 64 | |
| 1266. |
Identify the aqueous solution of the salt whose pH is less than '7'. |
| A. | Na2SO4 |
| B. | CH3COONa |
| C. | NaCl |
| D. | NH4Cl |
| Answer» E. | |
| 1267. |
After going through the processes of scouring and bleaching, 99% of cotton is made up of which polymer? |
| A. | Teflon |
| B. | Proteins |
| C. | Cellulose |
| D. | Epoxy |
| Answer» D. Epoxy | |
| 1268. |
Consider the following reduction processes:a) Zn2+ + 2e- ⟶ Zn(s); E° = -0.76 Vb) Ca2+ + 2e- ⟶ Ca(s); E° = -2.87 Vc) Mg2+ + 2e- ⟶ Mg(s); E° = -2.36 Vd) Ni2+ + 2e-⟶ Ni(s); E° = -0.25 VThe reducing power of the metals increases in the order |
| A. | Zn < Mg < Ni < Ca |
| B. | Ni < Zn < Mg < Ca |
| C. | Ca < Zn < Mg < Ni |
| D. | Ca < Mg < Zn < Ni |
| Answer» C. Ca < Zn < Mg < Ni | |
| 1269. |
Functional group -CHO is present in which of the following? |
| A. | Ketone |
| B. | Aldehyde |
| C. | Alcohol |
| D. | Carboxylic acid |
| Answer» C. Alcohol | |
| 1270. |
Among the following, the one which has maximum ionic character is |
| A. | NaCI |
| B. | KCI |
| C. | LiCI |
| D. | CsCI |
| Answer» E. | |
| 1271. |
Antioxidants presents in food stuffs: |
| A. | Retard action of oxygen on food materials |
| B. | Helps in its preservation |
| C. | Prevents spoilage |
| D. | All of the above |
| Answer» E. | |
| 1272. |
Adsorption of a gas follows Freundlich adsorption isotherm. x is the mass of the gas adsorbed on mass m of the adsorbent. The plot of \(\log \frac{{\rm{x}}}{{\rm{m}}}\) versus log p is shown in the given graph. \(\frac{{\rm{x}}}{{\rm{m}}}\) is proportional to: |
| A. | p2⁄3 |
| B. | p3⁄2 |
| C. | p3 |
| D. | p2 |
| Answer» B. p3⁄2 | |
| 1273. |
An atom is _________. |
| A. | the smallest particle of matter known |
| B. | the smallest particle of a gas |
| C. | the smallest indivisible particle of an element that can take part in a chemical change |
| D. | charged particle |
| Answer» B. the smallest particle of a gas | |
| 1274. |
Molar depression constant for a solvent is 4.0 K Kg mol-1. The depression in the freezing point of the solvent for 0.03 mol Kg-1 solution of K2 SO4 is:(Assume complete dissociation of the electrolyte) |
| A. | 0.18 K |
| B. | 0.24 K |
| C. | 0.12 K |
| D. | 0.36 K |
| Answer» E. | |
| 1275. |
Milk becomes sour if kept outside the refrigerator in summer because of: |
| A. | Its colour |
| B. | The conversion of lactose sugar to lactic acid |
| C. | The breakdown of proteins |
| D. | The calcium present in it |
| Answer» C. The breakdown of proteins | |
| 1276. |
How many hydrogen atoms are there in one molecule of toluene? |
| A. | 7 |
| B. | 4 |
| C. | 8 |
| D. | 6 |
| Answer» D. 6 | |
| 1277. |
Consider the following statements:1. Particles of matter intermix on their own.2. Particles of matter have force acting between them.Which of the statements given above is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» D. Neither 1 nor 2 | |
| 1278. |
K-shell is the ___________ energy level. |
| A. | Fourth |
| B. | First |
| C. | Third |
| D. | Second |
| Answer» C. Third | |
| 1279. |
Dolomite powder is applied in some agricultural lands. The purpose of applying it is to |
| A. | increase the pH of the soil |
| B. | lower the pH of the soil |
| C. | increase the phosphorus content of the soil |
| D. | increase the nitrogen content of the soil |
| Answer» B. lower the pH of the soil | |
| 1280. |
Different varieties of milk like full cream, skimmed, etc. are available in the market. The technique used for preparing skimmed milk is: |
| A. | Solvent extraction |
| B. | Centrifugation |
| C. | Evaporation |
| D. | Fractional distillation |
| Answer» C. Evaporation | |
| 1281. |
A solid having density of 9 × 103 kg m-3 forms face centered cubic crystals of edge length \(200\sqrt 2\) pm. What is the molar mass of the solid? [Avogadro constant = 6 × 1023 mol-1, π = 3] |
| A. | 0.03050 kg mol-1 |
| B. | 0.4320 kg mol-1 |
| C. | 0.0432 kg mol-1 |
| D. | 0.0216 kgmol-1 |
| Answer» B. 0.4320 kg mol-1 | |
| 1282. |
___________ is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. |
| A. | Sublimation |
| B. | Evaporation |
| C. | Condensation |
| D. | Liquidation |
| Answer» B. Evaporation | |
| 1283. |
Name the disinfectant that is used to purify water after it has been Iodine-treated. |
| A. | Potassium |
| B. | Iron |
| C. | Vitamin C |
| D. | Calcium |
| Answer» D. Calcium | |
| 1284. |
A little ether on the palm gives a cooling sensation because ether? |
| A. | Enters the pores of skin |
| B. | Is a cold liquid |
| C. | Evaporates |
| D. | Condenses on the palm |
| Answer» D. Condenses on the palm | |
| 1285. |
Consider the following pairs:Name : Formula1] 2-Chlorobutane : CH3CH2CH(Cl)CH32] Pentan-2-one : (CH3)2CHCOCH(CH3)23] Prop-2-enal : CH2CHCHO4] 2,4-Dimethylpentan-3-one : CH3COCH2CH2CH3Which of the above pairs are correctly matched? |
| A. | 1 and 3 only |
| B. | 1 and 4 only |
| C. | 3 and 4 only |
| D. | 2 and 3 only |
| Answer» B. 1 and 4 only | |
| 1286. |
________ is made up of smoke and fog. |
| A. | Cloud |
| B. | Smog |
| C. | Frost |
| D. | Haze |
| Answer» C. Frost | |
| 1287. |
_______ is not a chemical change.A. Cooking an eggB. Melting an ice cubeC. Baking a cakeD. Rotting bananas |
| A. | C |
| B. | A |
| C. | B |
| D. | D |
| Answer» D. D | |
| 1288. |
Given:(i) \(C\left( {graphite} \right)\; + {O_2}\;\left( g \right) \to C{O_2}\;\left( g \right);\;{\Delta _r}\;{H^ \ominus } = x\;kJ\;mo{l^{ - 1}}\;\)(ii) \(C\left( {graphite} \right)\; + \frac{1}{2}\;{O_2}\;\left( g \right) \to C{O_2}\;\left( g \right);\;{\Delta _r}\;{H^ \ominus } = y\;kJ\;mo{l^{ - 1}}\)(ii) \(C\left( {graphite} \right)\; + \frac{1}{2}\;{O_2}\;\left( g \right) \to C{O_2}\;\left( g \right);\;{\Delta _r}\;{H^ \ominus } = z\;kJ\;mo{l^{ - 1}}\)Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct? |
| A. | y = 2z – x |
| B. | x = y – z |
| C. | z = x + y |
| D. | x = y + z |
| Answer» E. | |
| 1289. |
1H3 and 2He4 are |
| A. | Nuclear isomers |
| B. | Isotones |
| C. | Isodiaphers |
| D. | Isobars |
| Answer» C. Isodiaphers | |
| 1290. |
In which of the following is citric acid present? |
| A. | Black Gram |
| B. | Curd |
| C. | Lemon |
| D. | Tamarind |
| Answer» D. Tamarind | |
| 1291. |
At what temperature is the density of water highest? |
| A. | 0°C |
| B. | 0°F |
| C. | 4 K |
| D. | 4°C |
| Answer» E. | |
| 1292. |
Match the following items of column (A) with column (B).Column AColumn BI. Vinegar1. Tartaric AcidII. Orange2. Lactic AcidIII. Tamarind3. Acetic AcidIV. Sour milk4. Citric Acid |
| A. | I – 3, II – 4, III – 1, IV – 2 |
| B. | I – 4, II – 3, III – 1, IV – 2 |
| C. | I – 3, II – 4, III – 2, IV – 1 |
| D. | I – 3, II – 2, III – 1, IV – 4 |
| Answer» B. I – 4, II – 3, III – 1, IV – 2 | |
| 1293. |
In the modern periodic table, which group elements have a complete outer shell? |
| A. | 15th |
| B. | 18th |
| C. | 16th |
| D. | 17th |
| Answer» C. 16th | |
| 1294. |
According to Rutherford atomic model, the electrons revolve around the nucleus in ________ paths. |
| A. | Elliptical |
| B. | Circular |
| C. | Linear |
| D. | Radial |
| Answer» C. Linear | |
| 1295. |
Natural gas mainly contains of _________. |
| A. | Propane |
| B. | Ethane |
| C. | Butane |
| D. | Methane |
| Answer» E. | |
| 1296. |
In the reaction ZnO + C → Zn + CO, 'C' acts as |
| A. | an acid |
| B. | a base |
| C. | an oxidising agent |
| D. | a reducing agent |
| Answer» E. | |
| 1297. |
Chemistry of carbon compounds is known as ______. |
| A. | Biochemistry |
| B. | Physical chemistry |
| C. | Inorganic chemistry |
| D. | Organic chemistry |
| Answer» E. | |
| 1298. |
Poly-β-hydroxybutyrate-Co- β-hydroxyvalerate (PHBV) is a copolymer of __________. |
| A. | 3-hydroxybutanoic acid and 2-hydroxypentanoic acid. |
| B. | 2-hydroxybutanoic acid and 3-hydroxypentanoic acid |
| C. | 3-hydroxybutanoic acid and 4-hydroxypentanoic acid |
| D. | 3-hydroxybutanoic acid and 3-hydroxypentanoic acid |
| Answer» E. | |
| 1299. |
CaSO42H2O is the chemical formula of _______. |
| A. | Epsom salt |
| B. | Gypsum |
| C. | Brimstone |
| D. | Quartz |
| Answer» C. Brimstone | |
| 1300. |
21 g of MgC03 will have _______ moles of magnesium. |
| A. | 0.31 |
| B. | 0.21 |
| C. | 0.25 |
| D. | 0.51 |
| Answer» D. 0.51 | |