MCQOPTIONS
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MCQOPTIONS
This section includes 621 Mcqs, each offering curated multiple-choice questions to sharpen your General Knowledge (GK) knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Which among the following elements is found in maximum percentage in the human body? |
| A. | Carbon |
| B. | Hydrogen |
| C. | Nitrozen |
| D. | Oxyzen |
| Answer» E. | |
| 152. |
What is the element that is in the highest percentage in the composition of the earth? |
| A. | Silicon |
| B. | Oxygen |
| C. | Magnesium |
| D. | Iron |
| Answer» C. Magnesium | |
| 153. |
Which of the following molecules or ions involved in the Nitrogen Cycle do not contain oxygen atom? |
| A. | Nitrite |
| B. | Ammonia |
| C. | Nitrate |
| D. | Laughing gas |
| Answer» C. Nitrate | |
| 154. |
When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in - |
| A. | Raman spectra |
| B. | Absorption spectra |
| C. | Emission spectra |
| D. | Fluorescence |
| Answer» D. Fluorescence | |
| 155. |
Which of the following elements has the atomic number greater than that of Phosphorus? |
| A. | Aluminium |
| B. | Silicon |
| C. | Chlorine |
| D. | Magnesium |
| Answer» D. Magnesium | |
| 156. |
Eposure to mixtures of chemicals are greater than expected on the basis of effects of expo-sure to each chemical individually. This is known as |
| A. | Additives |
| B. | Antagonism |
| C. | Synergism |
| D. | Independent |
| Answer» D. Independent | |
| 157. |
During inter conversion of energy from one form to other forms, total energy at any time remains |
| A. | constant |
| B. | zero |
| C. | increasing |
| D. | decreasing |
| Answer» B. zero | |
| 158. |
The inert gas abundantly found in widely distributed is - |
| A. | Xe |
| B. | Kr |
| C. | He |
| D. | Ar |
| Answer» E. | |
| 159. |
Hydrogen was discovered by - |
| A. | Cavendish |
| B. | Lavosier |
| C. | Rutherford |
| D. | Scheele |
| Answer» B. Lavosier | |
| 160. |
The atomic number of hydrogen is 1. This implies that it contains in its K- shell. |
| A. | One neutron |
| B. | One proton |
| C. | One electron |
| D. | None of the above |
| Answer» D. None of the above | |
| 161. |
Name the gas which is used in balloons in the place of hydrogen? |
| A. | nitrogen |
| B. | helium |
| C. | neorn |
| D. | argon |
| Answer» C. neorn | |
| 162. |
Silver nitrate solution is kept in brown bottles in laboratory because - |
| A. | it reacts with ordinary white bottles |
| B. | brown bottles stops the passage of light through it |
| C. | brown bottles do not react with it |
| D. | brown bottles react with it |
| Answer» C. brown bottles do not react with it | |
| 163. |
Nitrogen in water is commonly found in the form of - |
| A. | Nitrous oxide |
| B. | Nitrate |
| C. | Nitric oxide |
| D. | Nitrite |
| Answer» C. Nitric oxide | |
| 164. |
Which element found in all organic compounds? |
| A. | carbon |
| B. | nitrogen |
| C. | calcium |
| D. | none of them |
| Answer» B. nitrogen | |
| 165. |
Organic compounds are - |
| A. | Covalent compounds |
| B. | Ionic compounds |
| C. | Co-ordination compounds |
| D. | Interstitial compounds |
| Answer» B. Ionic compounds | |
| 166. |
In organic compounds, nitrogen is estimates by - |
| A. | Dumas method |
| B. | Carius method |
| C. | Victor-meyer's method |
| D. | Liebig's method |
| Answer» B. Carius method | |
| 167. |
Choose the incorrect statement pertaining to organic compounds - |
| A. | They have low melting and boiling points |
| B. | They do not dissolve in water |
| C. | They are not easily combustible |
| D. | They contain mainly carbon and hydrogen |
| Answer» D. They contain mainly carbon and hydrogen | |
| 168. |
Organic food is supposed to be better for human consumption because |
| A. | It is grown in glass house air tight environment |
| B. | It is grown without the use of chemicals & synthetic pesticides |
| C. | It depends on chemicals & fertilizers |
| D. | It is too expensive to buy |
| Answer» C. It depends on chemicals & fertilizers | |
| 169. |
If Metal A displaces Metal B from its solution, then Metal A . |
| A. | is more reactive than B |
| B. | is less reactive than B |
| C. | is heavier than B |
| D. | has the same reactivity as B |
| Answer» B. is less reactive than B | |
| 170. |
The oxidation number of nickel in K4[Ni(CN)4] is - |
| A. | Zero |
| B. | +4 |
| C. | -4 |
| D. | +8 |
| Answer» B. +4 | |
| 171. |
A metal is exposed to the atmosphere for some time. It becomes coated with green carbonate. The metal must be |
| A. | silver |
| B. | copper |
| C. | aluminium |
| D. | zinc |
| Answer» C. aluminium | |
| 172. |
Nitrogen forms a variety of compounds in all oxidation states ranging from - |
| A. | -3 to + 5 |
| B. | -3 to +3 |
| C. | -3 to + 4 |
| D. | -3 to +6 |
| Answer» B. -3 to +3 | |
| 173. |
Inert gases are - |
| A. | Miscible with water |
| B. | Not stable |
| C. | Chemically uncreative |
| D. | Chemically very active |
| Answer» D. Chemically very active | |
| 174. |
The compound that has the least value for octane number is |
| A. | 2-methyl heptane |
| B. | Iso-octane |
| C. | 2,2-dimethyl hexane |
| D. | n-heptane |
| Answer» E. | |
| 175. |
Which of the following is the maximum number of electrons that can be present in M- shell? |
| A. | 2 |
| B. | 8 |
| C. | 18 |
| D. | 32 |
| Answer» D. 32 | |
| 176. |
Electric bulbs are filled with |
| A. | Nitrogen |
| B. | Carbon dioxide |
| C. | Argon |
| D. | Oxygen |
| Answer» D. Oxygen | |
| 177. |
Cobalt (60) isotope is used in the treatment of which disease? |
| A. | Heart diseases |
| B. | cancer |
| C. | diabetes |
| D. | skin diseases |
| Answer» C. diabetes | |
| 178. |
Charcoal is used in water treatment as a/an - |
| A. | absorbent |
| B. | coagulant |
| C. | solvent |
| D. | adsorbent |
| Answer» E. | |
| 179. |
The molecular mass of a has is |
| A. | twice its vapour pressure |
| B. | equal to its vapour pressure |
| C. | half its vapour pressure |
| D. | not related to its vapour pressure |
| Answer» B. equal to its vapour pressure | |
| 180. |
Surface water is a better source of drinking water because it is poor in - |
| A. | Dust |
| B. | Bacteria |
| C. | Arsenic |
| D. | Algae |
| Answer» D. Algae | |
| 181. |
The umber of neutrons present in an element having mass number 226 and atomic number 88 is |
| A. | 88 |
| B. | 138 |
| C. | 314 |
| D. | 50 |
| Answer» C. 314 | |
| 182. |
An atom of an element with mass number 23 and atomic number 11 will have- |
| A. | 11 neutrons, 12 protons and 11 electrons |
| B. | 11 protons, 12 neutrons and 11 electrons |
| C. | 11 protons, 12 electrons and 11 neutrons |
| D. | 23 protons and 11 electrons |
| Answer» C. 11 protons, 12 electrons and 11 neutrons | |
| 183. |
Atomic mass of Sulphur is 32u. The number of moles in 16 games of Sulphur is: |
| A. | 1 mole of Sulphur |
| B. | 0.5 moles of Sulphur |
| C. | 0.75 moles of Sulphur |
| D. | 0.25 moles of Sulphur |
| Answer» C. 0.75 moles of Sulphur | |
| 184. |
The metal used to recover copper from a solution of copper sulfate is - |
| A. | Na |
| B. | Ag |
| C. | Hg |
| D. | Fe |
| Answer» E. | |
| 185. |
What product is formed when electricity is passed throughan aqueous solution of sodium chloride? |
| A. | Sodium and water |
| B. | Sodium oxide |
| C. | Sodium and chlorine |
| D. | Sodium hydroxide |
| Answer» E. | |
| 186. |
Soil having high content of aluminum and iron oxide is also known as - |
| A. | meadow soil |
| B. | pedalfer soil |
| C. | chernozen soil |
| D. | podzol soil |
| Answer» C. chernozen soil | |
| 187. |
Biofertilizers convert nitrogen to |
| A. | nitrates |
| B. | ammonia |
| C. | nitrogenase |
| D. | amino acids |
| Answer» C. nitrogenase | |
| 188. |
Atomic size refers to the of an atom. |
| A. | Radius |
| B. | Circumference |
| C. | Diameter |
| D. | Centre |
| Answer» B. Circumference | |
| 189. |
The iron ore which contains 72% of iron is |
| A. | Magnetite |
| B. | Limonite |
| C. | Haematite |
| D. | Siderite |
| Answer» B. Limonite | |
| 190. |
Which variety of coal contains recognizable traces of the original plant material? |
| A. | Anthracite |
| B. | Lignite |
| C. | Peat |
| D. | Bitumen |
| Answer» D. Bitumen | |
| 191. |
Who suggested that the most of the mass of atom is located in nucleus? |
| A. | Bohr |
| B. | Thomson |
| C. | Rutherford |
| D. | Avogadro |
| Answer» D. Avogadro | |
| 192. |
The nucleus of an atom consists of - |
| A. | electrons and neutrons |
| B. | electrons and protons |
| C. | protons and neutrons |
| D. | All of the above |
| Answer» D. All of the above | |
| 193. |
The greenhouse effect is caused by the higher level of which gas in the atmosphere? |
| A. | Carbon monoxide |
| B. | Carbon dioxide |
| C. | Nitrous oxide |
| D. | Sulphur dioxide |
| Answer» C. Nitrous oxide | |
| 194. |
Atomic number of an atom gives the number of which of the following? |
| A. | electrons |
| B. | protons |
| C. | neutrons |
| D. | neutrons and protons |
| Answer» C. neutrons | |
| 195. |
Number of neutrons in an atom of hydrogen is - |
| A. | One |
| B. | Zero |
| C. | Two |
| D. | Three |
| Answer» C. Two | |
| 196. |
The fundamental particles present in the nucleus of an atom are - |
| A. | Electron, proton |
| B. | Proton, neutron |
| C. | Neutron, electron |
| D. | Neutron, positron |
| Answer» C. Neutron, electron | |
| 197. |
The process of dissolving an acid or a base in water is a highly - |
| A. | Exothermic reaction |
| B. | Endothermic reaction |
| C. | Sublimation reaction |
| D. | Redux reaction |
| Answer» B. Endothermic reaction | |
| 198. |
Atoms of same element having different mass numbers are Called . |
| A. | Isobars |
| B. | Isotopes |
| C. | (3)Isotones |
| D. | (4) Isomers |
| Answer» C. (3)Isotones | |
| 199. |
What nucleus of atom contains? |
| A. | protons |
| B. | electrons |
| C. | electrons and protons |
| D. | protons and neutrons |
| Answer» E. | |
| 200. |
Lime water turns milky when carbon dioxide is passed through it. It is due to the for mation of: |
| A. | Calcium Carbonate |
| B. | Barium Carbonate |
| C. | Calcium Hydrogen Carbonate |
| D. | Calcium Oxide |
| Answer» B. Barium Carbonate | |