McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering , Mechanical Engineering .
| 151. |
The bactericidal, virucidal and cysticidal efficiency of chlorine as a disinfectant |
| A. | increases with a decrease in pH |
| B. | increases with a increase in pH |
| C. | decreases with a decrease in pH |
| D. | decreases with an increase in pH |
| E. | None of the above |
| Answer» A. increases with a decrease in pH | |
| 152. |
The air consumption of a four stroke diesel engine per rated BHP per hour will be |
| A. | 1 kg |
| B. | 5 to 7 kg |
| C. | 10 to 14 kg |
| D. | 20 kg |
| E. | None of the above |
| Answer» B. 5 to 7 kg | |
| 153. |
The discharge of hydrocarbons from automobile exhaust is maximum when the vehicle is |
| A. | Idling |
| B. | Cruising at low speeds |
| C. | Accelerating |
| D. | Decelerating |
| E. | Cruising at high speeds |
| Answer» A. Idling | |
| 154. |
The term BOD is associated with pollution arising out of |
| A. | air |
| B. | water |
| C. | noise |
| D. | land |
| E. | None of the above |
| Answer» B. water | |
| 155. |
Lead poisoning occurs when the lead content in water is |
| A. | 300 - 500 ppm |
| B. | 30 - 50 ppm |
| C. | 10 - 15 ppm |
| D. | 3 - 5 ppm |
| E. | 0.3 - 0.5 ppm |
| Answer» E. 0.3 - 0.5 ppm | |
| 156. |
Which of the following does not use ambient air for propulsion? |
| A. | Turbo jet |
| B. | Pulse jet |
| C. | Turbo-prop |
| D. | Rocket |
| E. | None of the above |
| Answer» D. Rocket | |
| 157. |
Which of the following units measures the memory of the Computer? |
| A. | Volts |
| B. | Amperes |
| C. | Ohms |
| D. | Bits |
| E. | None of these |
| Answer» D. Bits | |
| 158. |
A hard water may contain |
| A. | Calcium carbonate |
| B. | Magnesium sulphate |
| C. | Magnesium bicarbonate |
| D. | Any of the above |
| E. | None of the above |
| Answer» D. Any of the above | |
| 159. |
Which of the following operation produces highest noise level? |
| A. | welding |
| B. | Riveting |
| C. | Machining |
| D. | Pressing |
| E. | None of the above |
| Answer» B. Riveting | |
| 160. |
Water gas is a mixture of |
| A. | CO and H2 |
| B. | N2 and H2 |
| C. | CO2 and N2 |
| D. | SO2, CO2 and N2 |
| E. | None of the above |
| Answer» A. CO and H2 | |
| 161. |
Which of the following gas has least proportion in atmospheric air? |
| A. | Argon |
| B. | Carbondioxide |
| C. | Neon |
| D. | Helium |
| E. | None of the above |
| Answer» D. Helium | |
| 162. |
Which of the following symptom is not common between food poisoning and carbon monoxide poisoning? |
| A. | Nausea |
| B. | Vomiting |
| C. | Headache |
| D. | All of the above |
| E. | None of the above |
| Answer» C. Headache | |
| 163. |
The atmosphere gets heated up mainly by |
| A. | Direct sun-rays |
| B. | Radiation from the earth's surface |
| C. | Heat of the earth's interior |
| D. | Radiogenic heat |
| E. | None of these |
| Answer» B. Radiation from the earth's surface | |
| 164. |
The ratio activity of water due to Strontium can be removed by |
| A. | Aeration |
| B. | Alum coagulation |
| C. | Phosphate coagulation |
| D. | Lime |
| E. | Lime - Soda solution |
| Answer» C. Phosphate coagulation | |
| 165. |
Aeration of water is done for all of the following purposes EXCEPT for |
| A. | removal of bad tastes |
| B. | removal of carbon dioxide |
| C. | increasing the quantity of oxygen in water |
| D. | removal of temporary hardness |
| E. | None of the above |
| Answer» D. removal of temporary hardness | |
| 166. |
Which of the following plant is highly sensitive to mercury vapour? |
| A. | Sunflower |
| B. | Ivy |
| C. | Aloc |
| D. | Cherry |
| E. | Sarcococca |
| Answer» A. Sunflower | |
| 167. |
The emission of carbon monoxide in automobile exhaust will be low when the vehicle is |
| A. | Idling |
| B. | Cruising at low speed |
| C. | Cruising at high speed |
| D. | Accelerating |
| E. | Decelerating |
| Answer» C. Cruising at high speed | |
| 168. |
For removal of temporary hardness of water |
| A. | Water is filtered |
| B. | Water is boiled |
| C. | Alum is added to water |
| D. | Lime is added to water |
| E. | Chlorine is passed through water |
| Answer» C. Alum is added to water | |
| 169. |
The total count of bacteria in portable water should not exceed |
| A. | 10,000 per c.c. |
| B. | 5000 per c.c. |
| C. | 998 per c.c. |
| D. | 10 per c.c. |
| E. | 1 mg/litre |
| Answer» D. 10 per c.c. | |
| 170. |
The rate at which atoms of radioactive sources disintegrate is measured in terms of |
| A. | Cuire |
| B. | Atomic number |
| C. | Wavelength |
| D. | Frequency |
| E. | None of the above |
| Answer» A. Cuire | |
| 171. |
BF3 counter can detect which of the following radiations? |
| A. | Alpha particles |
| B. | Neutrons |
| C. | X-rays |
| D. | Beta rays |
| E. | None of the above |
| Answer» B. Neutrons | |
| 172. |
For minimal eye irritation, pH value of swimming pool water should be in the range |
| A. | 6.2 to 6.8 |
| B. | 6.5 to 7.0 |
| C. | 7.0 to 7.2 |
| D. | 7.5 to 7.6 |
| E. | None of the above |
| Answer» D. 7.5 to 7.6 | |
| 173. |
Car speed of a lift is usually |
| A. | 0.1 to 0.3 m/s |
| B. | 0.5 to 1 m/s |
| C. | 2 to 5 m/s |
| D. | 7 to 10 m/s |
| E. | None of the above |
| Answer» B. 0.5 to 1 m/s | |
| 174. |
A blue smoke from a diesel engine indicates presence of |
| A. | Nitrous oxide |
| B. | Carbon dioxide |
| C. | Carbon monoxide |
| D. | Unburnt oil |
| E. | Unburnt carbon |
| Answer» D. Unburnt oil | |
| 175. |
Which of the following is not a constituent of coal? |
| A. | Hydrogen |
| B. | Nitrogen |
| C. | Inorganic matter |
| D. | Manganese |
| E. | None of the above |
| Answer» D. Manganese | |
| 176. |
For portable water the permissible pH value is |
| A. | 1 - 4.5 |
| B. | 4.5 - 7 |
| C. | 7 - 8.5 |
| D. | 9 -- 11 |
| E. | 11 -- 14 |
| Answer» C. 7 - 8.5 | |
| 177. |
The percentage of krypton in atmospheric air is around |
| A. | 0.01 ppm |
| B. | 0.1 ppm |
| C. | 1 ppm |
| D. | 10 ppm |
| E. | None of the above |
| Answer» C. 1 ppm | |
| 178. |
Which of the following is the major source of environmental pollution in urban areas? |
| A. | Rolling mills |
| B. | Power plants |
| C. | Automobiles |
| D. | Floor mills |
| E. | Electronic industries |
| Answer» C. Automobiles | |
| 179. |
Which of the following is considered as the noble gas? |
| A. | Oxygen |
| B. | Ozone |
| C. | Hydrogen |
| D. | Argon |
| E. | None of these |
| Answer» D. Argon | |
| 180. |
Which of the following is an artificial source of energy? |
| A. | Sun |
| B. | Coal |
| C. | Wood |
| D. | Electricity |
| E. | None of these |
| Answer» D. Electricity | |
| 181. |
The hardness of soft water (in ppm) is |
| A. | 0 - 50 |
| B. | 50 - 150 |
| C. | 200 - 350 |
| D. | 375 - 500 |
| E. | 500 - 1000 |
| Answer» A. 0 - 50 | |
| 182. |
The cycle of life, death and decay involving organic nitrogeneous matter is called |
| A. | The sulphur cycle |
| B. | The nitrogen cycle |
| C. | The carbon cycle |
| D. | The hydrological cycle |
| E. | None of the above |
| Answer» B. The nitrogen cycle | |
| 183. |
The process of removal of permanent hardness of water is |
| A. | Zeolite process |
| B. | Sedimentation process |
| C. | Filtration process |
| D. | Boiling process |
| E. | Lime process |
| Answer» A. Zeolite process | |
| 184. |
Fuel which detonates easity is |
| A. | Benzene |
| B. | Iso-octance |
| C. | n-heptane |
| D. | Toulene |
| E. | None of the above |
| Answer» C. n-heptane | |
| 185. |
Which of the following constituent has highest proportion in atmospheric air? |
| A. | Nitrous oxide |
| B. | Carbon monoxide |
| C. | Helium |
| D. | Neon |
| E. | None of the above |
| Answer» D. Neon | |
| 186. |
Which of the following acts as ignition accelerator for C.I. engine fuels? |
| A. | Acetone peroxide |
| B. | Hydrogen peroxide |
| C. | Aromatic compounds |
| D. | n-heptane |
| E. | None of the above |
| Answer» A. Acetone peroxide | |
| 187. |
Which of the following measures the heat of combustion? |
| A. | Bomb's calorimeter |
| B. | Thermostat |
| C. | Beckmann's thermometer |
| D. | Refrigerator |
| E. | Green |
| Answer» A. Bomb's calorimeter | |
| 188. |
Which of the following is unlikely to be the pollutant from a sulphuric acid plant? |
| A. | Sulphur dioxide |
| B. | Sulphur trioxide |
| C. | Acid mist |
| D. | Hydrogen sulphide |
| E. | All of the above |
| Answer» D. Hydrogen sulphide | |
| 189. |
For the maximum alkalinity of water, the pH value would be |
| A. | Zero |
| B. | 7 |
| C. | 8 |
| D. | 14 |
| E. | 20 |
| Answer» D. 14 | |
| 190. |
Zeolite is |
| A. | A naturally occurring salt |
| B. | Hydread silica |
| C. | Silicon carbide |
| D. | Hydrated calcium silicate |
| E. | Hydrated alumino-silicate |
| Answer» E. Hydrated alumino-silicate | |
| 191. |
Which of the following particles will be smallest in size? |
| A. | Smog |
| B. | Rain |
| C. | Drizzle |
| D. | Mist |
| E. | Fog |
| Answer» A. Smog | |
| 192. |
Which of the following disease is associated with air pollution? |
| A. | Bronchial asthma |
| B. | Chronic bronchitis |
| C. | Emphysema |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 193. |
The water borne bacterial infections may cause |
| A. | Typhoid fever |
| B. | Dysentery |
| C. | Cholera |
| D. | Any of the above |
| E. | None of the above |
| Answer» D. Any of the above | |
| 194. |
LPG stands for |
| A. | Liquefied petroleum gas |
| B. | Low pressure gas |
| C. | Lubricated and purified gas |
| D. | Low purity gas |
| E. | None of the above |
| Answer» A. Liquefied petroleum gas | |
| 195. |
Which of the following symptoms will not show that combustion is necessarily complete? |
| A. | Presence of free carbon is exhaust |
| B. | Presence of carbon monoxide in exhaust |
| C. | Presence of oxygen in exhaust |
| D. | Presence of nitrogen in exhaust |
| E. | None of the above |
| Answer» D. Presence of nitrogen in exhaust | |
| 196. |
Thiosulphate is the antidote for the poisonous effect due to |
| A. | Arsenic |
| B. | Lead |
| C. | Mercury |
| D. | Cyanide |
| E. | Organic phosphorous compounds |
| Answer» D. Cyanide | |
| 197. |
Low grade fuels have |
| A. | low moisture content |
| B. | low ash content |
| C. | low calorific value |
| D. | low carbon content |
| E. | None of the above |
| Answer» C. low calorific value | |
| 198. |
Curies is a measure of |
| A. | biological effect of radiation which a man can sustain |
| B. | the rate at which atoms of radioactive sources disintegrate |
| C. | 86 ergs of energy per gram of air |
| D. | ions percent in an ionised gas |
| E. | None of the above |
| Answer» A. biological effect of radiation which a man can sustain | |
| 199. |
The presence of algae in water indicates that the water is |
| A. | Hard |
| B. | Soft |
| C. | Acidic |
| D. | Pune |
| E. | Free from turbidity |
| Answer» C. Acidic | |
| 200. |
Electrostatic precipitators are largely used in |
| A. | water treatment plants |
| B. | sewage disposal plants |
| C. | Thermal power plants |
| D. | nuclear power plants |
| E. | None of the above |
| Answer» C. Thermal power plants | |
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