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.
| 2001. |
Corundum and Cryolite are important ores of which of the following metals? |
| A. | Silver |
| B. | Iron |
| C. | Aluminium |
| D. | Tin |
| Answer» D. Tin | |
| 2002. |
NH3 has a much higher b.p. than PH3 because |
| A. | NH3 has a larger molecular weight |
| B. | NH3 undergoes umbrella inversion |
| C. | NH3 forms hydrogen bonds |
| D. | NH3 contains ionic bonds whereas PH3 contains covalent bonds |
| Answer» D. NH3 contains ionic bonds whereas PH3 contains covalent bonds | |
| 2003. |
How is an atomic mass number determined? |
| A. | By total number of protons |
| B. | By total number of neutrons |
| C. | By adding a number of protons and neutrons |
| D. | By total number of electrons |
| Answer» D. By total number of electrons | |
| 2004. |
An element “X” has a Z value equal to 17 and mass number equal to 37. What is the number of neutrons present in its nucleus? |
| A. | 37 |
| B. | 54 |
| C. | 17 |
| D. | 20 |
| Answer» E. | |
| 2005. |
How many series of acidic salts can be formed by orthophosphoric acid? |
| A. | 4 |
| B. | 3 |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 2006. |
Butanone is a four-carbon compound with the functional group- |
| A. | Carboxylic acid |
| B. | Ketone |
| C. | Aldehyde |
| D. | Alcohol |
| Answer» C. Aldehyde | |
| 2007. |
_____ is a deliquescent compound |
| A. | Quick lime |
| B. | Sulphuric acid |
| C. | Phosphorous pentoxide |
| D. | Sodium chloride |
| Answer» D. Sodium chloride | |
| 2008. |
Match List - I with List - II and select the correct answer from the codes given below: List - I List - II A. Vitamin B12 1. Magnesium B. Haemoglobin 2. Cobalt C. Chlorophyll 3. Copper D. Brass 4. Iron |
| A. | A - 2, B - 4, C - 1, D - 3 |
| B. | A - 2, B - 1, C - 3, D - 4 |
| C. | A - 4, B - 1, C - 2, D - 3 |
| D. | A - 3, B - 4, C - 2, D - 1 |
| Answer» B. A - 2, B - 1, C - 3, D - 4 | |
| 2009. |
Lowering the atmospheric pressure on a liquid |
| A. | increases the boiling point of the liquid |
| B. | lowers the boiling point of the liquid |
| C. | does not affect the boiling point of the liquid |
| D. | increases the time required for it to boil |
| Answer» C. does not affect the boiling point of the liquid | |
| 2010. |
How many water molecules are present in one molecule of washing soda? |
| A. | 12 |
| B. | 7 |
| C. | 5 |
| D. | 10 |
| Answer» E. | |
| 2011. |
A carbon compound when heated in excess of concentrated sulphuric acid at 443K gives ethane. The compound is an________. |
| A. | alcohol |
| B. | acid |
| C. | ester |
| D. | alkane |
| Answer» B. acid | |
| 2012. |
Gas usually filled in electric bulb is |
| A. | Hydrogen |
| B. | Oxygen |
| C. | Carbon Dioxide |
| D. | Nitrogen |
| Answer» E. | |
| 2013. |
Elements having same atomic mass number and different atomic numbers are called ____? |
| A. | None of these |
| B. | Isotopes |
| C. | Isobar |
| D. | Isotonic |
| Answer» D. Isotonic | |
| 2014. |
Atoms of different elements with different atomic numbers, having same mass number is known as _________. |
| A. | Ion |
| B. | Isohalines |
| C. | Isobars |
| D. | Isotopes |
| Answer» D. Isotopes | |
| 2015. |
A chemical process in which a substance reacts with oxygen to give out heat is called: |
| A. | Combustion |
| B. | Radiation |
| C. | Flaming |
| D. | Non-combustion |
| Answer» B. Radiation | |
| 2016. |
A sample of any of the following substances disappears after sometime when exposed to air like camphor, naphthalene or dry ice. This phenomenon is called |
| A. | Sublimation |
| B. | Evaporation |
| C. | Diffusion |
| D. | Radiation |
| Answer» B. Evaporation | |
| 2017. |
Employing Chromatography, one cannot separate |
| A. | radio-isotopes |
| B. | colours from a dye |
| C. | pigments from a natural colour |
| D. | drugs from blood |
| Answer» B. colours from a dye | |
| 2018. |
From the below-given elements which one _______ is smallest in size. |
| A. | All of these options |
| B. | Mg2+ |
| C. | Al3+ |
| D. | Na+ |
| Answer» D. Na+ | |
| 2019. |
Potassium is a chemical element with the symbol: |
| A. | Na |
| B. | S |
| C. | Ca |
| D. | K |
| Answer» E. | |
| 2020. |
Formula for styrene is ________. |
| A. | CH2 = CH - C4H7 = CH2 |
| B. | C6H5CH = CH2 |
| C. | C5H4CH = CH2 |
| D. | CH2 = CH - C3H5 = CH2 |
| Answer» C. C5H4CH = CH2 | |
| 2021. |
Bleaching powder is ____. |
| A. | Ca2OCl |
| B. | CaOCl2 |
| C. | CaClO2 |
| D. | CaCl2 |
| Answer» C. CaClO2 | |
| 2022. |
_______ is present in tomato. |
| A. | Tartaric Acid |
| B. | Oxalic Acid |
| C. | Acetic Acid |
| D. | None of these |
| Answer» C. Acetic Acid | |
| 2023. |
In general, physical classification of states of matter does not included the ______ state. |
| A. | Colloidal |
| B. | Gaseous |
| C. | Liquid |
| D. | Solid |
| Answer» B. Gaseous | |
| 2024. |
Chemical name of washing soda is: |
| A. | Sodium chloride |
| B. | Sodium hydrogen carbonate |
| C. | Sodium carbonate |
| D. | Sodium hydroxide |
| Answer» D. Sodium hydroxide | |
| 2025. |
How many groups are there in the modern periodic table? |
| A. | 9 |
| B. | 18 |
| C. | 21 |
| D. | 8 |
| Answer» C. 21 | |
| 2026. |
Isotopes of an element have |
| A. | Same atomic number |
| B. | Different mass number |
| C. | Same chemical properties |
| D. | All of these |
| Answer» E. | |
| 2027. |
Fill in the blanks with suitable option:A/An ______ turns blue litmus red and a/an _____ turns ______ litmus blue.A. Base, acid, redB. Acid, base, greenC. Base, acid, pinkD. Acid, base, red |
| A. | C |
| B. | A |
| C. | D |
| D. | B |
| Answer» D. B | |
| 2028. |
Acidity in stomach after overeating can be remedied by consuming: |
| A. | Vegetables |
| B. | Fruit juice |
| C. | Lemon juice |
| D. | Baking soda |
| Answer» E. | |
| 2029. |
Naphthalene balls disappear with time because of _______. |
| A. | Evaporation |
| B. | Distillation |
| C. | Sublimation |
| D. | Crystallisation |
| Answer» D. Crystallisation | |
| 2030. |
An element A forms an oxide with the formula A3O4 . What is the valency of element A? |
| A. | 3 |
| B. | 1 |
| C. | 4 |
| D. | 2 |
| Answer» E. | |
| 2031. |
Number of carbon atoms in Buck-Minster fullerene are |
| A. | 30 |
| B. | 90 |
| C. | 60 |
| D. | 16 |
| Answer» D. 16 | |
| 2032. |
Fill in the blank with the most appropriate option.An element attains stability when it achieves ________ state. |
| A. | an only-duplet |
| B. | a duplet or octet |
| C. | an only-octet |
| D. | a heptane |
| Answer» C. an only-octet | |
| 2033. |
Galena is an ore of: |
| A. | zinc |
| B. | lead |
| C. | silver |
| D. | copper |
| Answer» C. silver | |
| 2034. |
In which of the following classifications are the elements arranged in the order of their increasing atomic number? |
| A. | The Modern Periodic Table |
| B. | Mendeleev’s Periodic Table |
| C. | Newland’s Law of Octaves |
| D. | Dobereiner’s Triads |
| Answer» B. Mendeleev’s Periodic Table | |
| 2035. |
20 g of common salt is dissolved in 180 g of water. is the mass percentage of the salt in the solution? |
| A. | 5% |
| B. | 9% |
| C. | 10% |
| D. | 15% |
| Answer» D. 15% | |
| 2036. |
e1 is the e.c.e of an element of chemical equivalence E1. The e.c.e of an element of chemical equivalence E2 is |
| A. | \(\frac{{E2E1}}{{e1}}\) |
| B. | \(\frac{{E1}}{{e1E2}}\) |
| C. | \(\frac{{e1E1}}{{E2}}\) |
| D. | \(\frac{{e1E2}}{{E1}}\) |
| Answer» E. | |
| 2037. |
German silver is an alloy of which of the following metals? |
| A. | Aluminium and Tin |
| B. | Copper and Silver |
| C. | Iron, Silver and Tin |
| D. | Copper, Zinc and Nickel |
| Answer» E. | |
| 2038. |
Blue Vitriol is another name for which of the following? |
| A. | Copper Sulphate |
| B. | Oxygen |
| C. | Copper |
| D. | Magnesium Oxide |
| Answer» B. Oxygen | |
| 2039. |
Presently, scientists are talking of _______ states of matter. |
| A. | 5 |
| B. | 3 |
| C. | 2 |
| D. | 4 |
| Answer» B. 3 | |
| 2040. |
N + 1 value of the 6p orbital is: |
| A. | 5 |
| B. | 8 |
| C. | 7 |
| D. | 3 |
| Answer» B. 8 | |
| 2041. |
Metal 'X' displaces metal 'Y' from its salt solution but is not able to displace metal 'Z' from its salt solution. Identify the most reactive metal. |
| A. | Z |
| B. | Cannot be determined |
| C. | X |
| D. | Y |
| Answer» B. Cannot be determined | |
| 2042. |
Natural source of vitamin C is- |
| A. | Guava |
| B. | Apple |
| C. | Spinach |
| D. | All of the options |
| Answer» E. | |
| 2043. |
On adding some detergent to water, the surface tension |
| A. | decreases |
| B. | remains same |
| C. | increases |
| D. | initially decreases then increases |
| Answer» B. remains same | |
| 2044. |
An atom that can neither gain nor lose electrons is said to be? |
| A. | Metalic |
| B. | Non Metalic |
| C. | An Inert |
| D. | Atmospheric |
| Answer» D. Atmospheric | |
| 2045. |
Ag+2 + Ag → 2Ag+ is an example of: |
| A. | Precipitation reaction |
| B. | Disproportionation reaction |
| C. | Comproportionation reaction |
| D. | Displacement reaction |
| Answer» D. Displacement reaction | |
| 2046. |
Filament of electric bulbs is generally made of ______. |
| A. | Nichrome |
| B. | Tungsten |
| C. | Constantan |
| D. | Manganin |
| Answer» C. Constantan | |
| 2047. |
During calcination process |
| A. | Only CO2 is given out |
| B. | Only H2O from hydrates is given out |
| C. | (1) or (2) depending on type of ore |
| D. | H2S given out |
| Answer» D. H2S given out | |
| 2048. |
At 300 K and 1 atmospheric pressure, 10 mL of a hydrocarbon required 55 mL of O2 for complete combustion, and 40 mL of CO2 is formed. The formula of the hydrocarbon is: |
| A. | C4 H10 |
| B. | C4 H6 |
| C. | C4 H7 Cl |
| D. | C4 H8 |
| Answer» C. C4 H7 Cl | |
| 2049. |
Assertion: For the extraction of iron, haematite ore is used.Reason: Haematite is a carbonate ore of iron. |
| A. | Only the reason is correct |
| B. | Both the assertion and reason are correct, but the reason is not the correct explanation for the assertion. |
| C. | Both the assertion and reason are correct and the reason is the correct explanation for the assertion. |
| D. | Only the assertion is correct. |
| Answer» E. | |
| 2050. |
An ion X2+ contains 18 electrons and 20 neutrons. Name the element. |
| A. | Potassium |
| B. | Calcium |
| C. | Magnesium |
| D. | Argon |
| Answer» C. Magnesium | |