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MCQOPTIONS
This section includes 6820 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 2151. |
The conversion of chemical energy into electrical energy takes place as follows? |
| A. | by electrolysis |
| B. | by photosynthesis |
| C. | by respiration |
| D. | by excitation |
| Answer» B. by photosynthesis | |
| 2152. |
dry cells? |
| A. | primary cell |
| B. | secondary cell |
| C. | tertiary cell |
| D. | quartile cell |
| Answer» B. secondary cell | |
| 2153. |
What is the unit of kilowatt-hour? |
| A. | Potential difference |
| B. | electric power |
| C. | electrical energy |
| D. | electric potential |
| Answer» D. electric potential | |
| 2154. |
There is a loud sound when the bulb is broken, because . . . |
| A. | The air quickly enters the vacuum inside the bulb. |
| B. | There is explosive gas inside the bulb. |
| C. | The filament of the bulb interacts with the air. |
| D. | The gas inside the bulb suddenly expands. |
| Answer» B. There is explosive gas inside the bulb. | |
| 2155. |
The safety fuse wire used in household electrical appliances is made of a metal whose |
| A. | resistance is low |
| B. | low melting point |
| C. | have a low specific density |
| D. | have low conductivity |
| Answer» C. have a low specific density | |
| 2156. |
What alloy is the filament of a halogen lamp made of? |
| A. | Tungsten and Iodine |
| B. | tungsten and bromine |
| C. | tungsten and sodium |
| D. | Molybdenum and sodium |
| Answer» B. tungsten and bromine | |
| 2157. |
Which is not a fossil fuel or is not obtained from fossil fuel? |
| A. | L. P . Yes |
| B. | natural gas |
| C. | bio gas |
| D. | C . N. Yes |
| Answer» D. C . N. Yes | |
| 2158. |
Which is a conductor of electricity? |
| A. | Rubber |
| B. | pure water |
| C. | salt water |
| D. | benzene |
| Answer» D. benzene | |
| 2159. |
Which of the following converts AC voltage to DC? |
| A. | transformer |
| B. | amplifier |
| C. | Disruptive |
| D. | oscillator |
| Answer» D. oscillator | |
| 2160. |
Which has the lowest electrical resistivity at room temperature? |
| A. | aluminum |
| B. | copper |
| C. | nichrome |
| D. | Iron |
| Answer» C. nichrome | |
| 2161. |
On what principle do optical fibers work? |
| A. | Full internal reflection |
| B. | of interference |
| C. | scatter |
| D. | diffraction |
| Answer» B. of interference | |
| 2162. |
Which nuclear fuel is there in the Sun? |
| A. | helium |
| B. | uranium |
| C. | hydrogen |
| D. | alpha particle |
| Answer» D. alpha particle | |
| 2163. |
The acid used in car battery is? |
| A. | hydrochloric acid |
| B. | boric acid |
| C. | sulfuric acid |
| D. | carbonic acid |
| Answer» D. carbonic acid | |
| 2164. |
Warm blooded animals are those that keep their body temperature |
| A. | Lower than the temperature of the atmosphere. |
| B. | kept higher than the temperature of the atmosphere. |
| C. | Always keep the same. |
| D. | Maintains the same temperature as the atmosphere. |
| Answer» D. Maintains the same temperature as the atmosphere. | |
| 2165. |
The following layer is applied on the walls of the thermos bottle to keep the beverage at the same temperature for some time? |
| A. | infrared |
| B. | X-rays |
| C. | Visible |
| D. | radio waves |
| Answer» E. | |
| 2166. |
By whom can thenotgate be implemented? |
| A. | single diode |
| B. | two diodes |
| C. | single insulator |
| D. | single transistor |
| Answer» E. | |
| 2167. |
The source of energy in the sun is |
| A. | fission of nuclei |
| B. | fusion of nuclei |
| C. | chemical reactions |
| D. | rapid compression |
| Answer» C. chemical reactions | |
| 2168. |
What are the pieces of magnet protector? |
| A. | Nickel |
| B. | cobalt |
| C. | steel |
| D. | soft iron |
| Answer» E. | |
| 2169. |
Which harmful gas is released by factories and vehicles? |
| A. | carbon monoxide |
| B. | nitrogen dioxide |
| C. | sulphur dioxide |
| D. | Carbon dioxide |
| Answer» B. nitrogen dioxide | |
| 2170. |
Balloon tied on the mouth When an empty glass bottle is placed in hot water, the balloon starts to inflate, the reason for this? |
| A. | swells after getting heat |
| B. | The air pressure of the bottle increases in hot water |
| C. | Bottle air becomes heavy in hot water |
| D. | Hot water increases the temperature of the air in the bottle. |
| Answer» E. | |
| 2171. |
Which fuel is unpolluted for the vehicle? |
| A. | petrol |
| B. | diesel |
| C. | kerosene |
| D. | Compressed Natural Gas (CNG) |
| Answer» E. | |
| 2172. |
Which of the following converts solar energy into chemical energy most efficiently? |
| A. | Chlorella |
| B. | Tiger |
| C. | earthworm |
| D. | kascutta |
| Answer» E. | |
| 2173. |
The resistance of a uniform conductor of an object is equal to its length. . . . . and the area of its cross-section. . . . It happens ? |
| A. | inversely proportional |
| B. | sequentially, sequentially |
| C. | inversely proportional, sequentially |
| D. | inversely proportional, inversely proportional |
| Answer» B. sequentially, sequentially | |
| 2174. |
How does a signal flow in fiber optic communication? |
| A. | light wave |
| B. | Radio wave |
| C. | micro wave |
| D. | electric wave |
| Answer» B. Radio wave | |
| 2175. |
Light appears to move in a straight line because . . . |
| A. | It is made up of small particles. |
| B. | The speed of light is very high. |
| C. | The wavelength of light is very short. |
| D. | Light is reflected from its surroundings. |
| Answer» D. Light is reflected from its surroundings. | |
| 2176. |
The time taken for sunlight to reach the surface of the earth is approx. . . |
| A. | 4.2 minutes |
| B. | 8 minutes |
| C. | 8. 5 minutes |
| D. | 6 minutes |
| Answer» D. 6 minutes | |
| 2177. |
Which disease is caused by polluted smoke coming out of factories? |
| A. | AIDS |
| B. | Malaria |
| C. | asthma |
| D. | typhoid |
| Answer» D. typhoid | |
| 2178. |
Through which of the following will the speed of light be minimum? |
| A. | glass |
| B. | Vacuum |
| C. | water |
| D. | Wind |
| Answer» B. Vacuum | |
| 2179. |
Which law of thermodynamics gives the concept of internal energy? |
| A. | Zero |
| B. | first rule |
| C. | second law |
| D. | third law |
| Answer» C. second law | |
| 2180. |
When a person enters a dark room from a brightly lit area, he cannot see clearly for some time, later gradually he starts seeing things. this is due to ? |
| A. | change in pupil size |
| B. | Change in lens diameter and focus distance |
| C. | bleaching and recrystallization of rhodopsin |
| D. | dark-adaptation |
| Answer» E. | |
| 2181. |
Does photoelectric cell change? |
| A. | electrical energy into light energy |
| B. | light energy into electrical energy |
| C. | light energy into chemical energy |
| D. | electrical energy into mechanical energy |
| Answer» C. light energy into chemical energy | |
| 2182. |
What is the unit of electrical conductivity? |
| A. | ओम ( Ohm ) |
| B. | Ohm-cu ( Ohm-cu ) |
| C. | mho |
| D. | mho - cu - 1 ( mho - cu ) |
| Answer» D. mho - cu - 1 ( mho - cu ) | |
| 2183. |
When an electric current is passed through a metal, then . . . |
| A. | metal temperature rises |
| B. | metal temperature decreases |
| C. | temperature remains constant |
| D. | none of these |
| Answer» B. metal temperature decreases | |
| 2184. |
The bending of light from the edge of an obstacle is called? |
| A. | deflection |
| B. | diffraction |
| C. | refraction |
| D. | interference |
| Answer» C. refraction | |
| 2185. |
Which color has the highest deflection in a rainbow? |
| A. | purple |
| B. | Yellow |
| C. | Red |
| D. | Blue |
| Answer» B. Yellow | |
| 2186. |
A person sitting with his feet hanging in the water sees his leg bent and short? |
| A. | due to refraction |
| B. | due to reflection |
| C. | due to diffraction |
| D. | due to dispersion |
| Answer» B. due to reflection | |
| 2187. |
near vision. . . . . can be corrected? |
| A. | convex lens |
| B. | Concave lens |
| C. | Convex - Concave lens |
| D. | Concave - Convex lens |
| Answer» C. Convex - Concave lens | |
| 2188. |
A human cannot clearly see an object less than 1 meter away. What fault is that person suffering from? |
| A. | far-sightedness |
| B. | near vision |
| C. | lock's disease |
| D. | No one |
| Answer» B. near vision | |
| 2189. |
Which of the following colors has maximum wavelength? |
| A. | Blue |
| B. | Yellow |
| C. | Green |
| D. | Red |
| Answer» E. | |
| 2190. |
Who was the first to show that light waves are diffracted? |
| A. | Gremaldi |
| B. | Young |
| C. | maxwell |
| D. | Focalt |
| Answer» B. Young | |
| 2191. |
The swimming pool appears less deep than the actual depth. this is due to ? |
| A. | refraction |
| B. | light scattering |
| C. | reflection |
| D. | interference |
| Answer» B. light scattering | |
| 2192. |
On the basis of incident light waves are confirmed to be transverse? |
| A. | Bipolarity |
| B. | of interference |
| C. | Polarization |
| D. | reflection |
| Answer» C. Polarization | |
| 2193. |
What is a dentist's mirror? |
| A. | Convex mirror |
| B. | concave mirror |
| C. | plane mirror |
| D. | cylindrical mirror |
| Answer» C. plane mirror | |
| 2194. |
How many colors are there in the rays of the sun? |
| A. | 5 |
| B. | 6 |
| C. | 7 |
| D. | 8 |
| Answer» D. 8 | |
| 2195. |
Which lens is used in the glasses of a person suffering from far-sightedness? |
| A. | convex lens |
| B. | Concave lens |
| C. | flat lens |
| D. | Plane - Concave lens |
| Answer» B. Concave lens | |
| 2196. |
What will be the minimum length of the mirror required for a 1.5 meter tall person to see his entire image? |
| A. | 1.5 meters |
| B. | 0 . 75 meters |
| C. | 3 meters |
| D. | 2 meters |
| Answer» C. 3 meters | |
| 2197. |
Glowing of oil layer over water is an example? |
| A. | of reflection |
| B. | of interference |
| C. | of scattering |
| D. | of refraction |
| Answer» C. of scattering | |
| 2198. |
In the case of total internal reflection, does light get reflected? |
| A. | 20 percent |
| B. | 25 percent |
| C. | 1 percent |
| D. | hundred percent |
| Answer» E. | |
| 2199. |
The point from which the light-rays appear to be spreading after reflection or refraction, is called that point source? |
| A. | real image |
| B. | Virtual reflection |
| C. | Both of the above are correct. |
| D. | neither of the above |
| Answer» C. Both of the above are correct. | |
| 2200. |
The light with the shortest wavelength is? |
| A. | Red |
| B. | Yellow |
| C. | Blue |
| D. | purple |
| Answer» E. | |