MCQOPTIONS
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MCQOPTIONS
This section includes 2268 Mcqs, each offering curated multiple-choice questions to sharpen your Grade7 knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Fish in the ponds and lakes die because the algae |
| A. | takes all the minerals from water |
| B. | takes all the oxygen from water |
| C. | prevents sunlight to enter water |
| D. | prevent from respiring |
| Answer» C. prevents sunlight to enter water | |
| 252. |
Water can be kept pure if we throw |
| A. | litter in the trash |
| B. | litter near a stream |
| C. | litter near a pond |
| D. | pour waste oil in rivers |
| Answer» B. litter near a stream | |
| 253. |
The average depth of the largest ocean is |
| A. | 1000 meters |
| B. | 2000 meters |
| C. | 3000 meters |
| D. | 4000 meters |
| Answer» E. | |
| 254. |
Water of oceans and seas is |
| A. | sour |
| B. | bitter |
| C. | sweet |
| D. | salty |
| Answer» E. | |
| 255. |
The main source of near-real-time solar data for space weather prediction is |
| A. | Helios A |
| B. | Genesis |
| C. | SOHO |
| D. | Alpha |
| Answer» D. Alpha | |
| 256. |
We know that earth is a part of |
| A. | Sun |
| B. | Moon |
| C. | Solar system |
| D. | Jupiter |
| Answer» D. Jupiter | |
| 257. |
For example, if you use a football to represent a star for showing distance, you would have to place it |
| A. | 1000 km apart |
| B. | 2000 km apart |
| C. | 4000 km apart |
| D. | 8000 km apart |
| Answer» E. | |
| 258. |
Constellations make it easier for us to find |
| A. | sun |
| B. | galaxies |
| C. | stars |
| D. | comets |
| Answer» D. comets | |
| 259. |
The biggest star found in universe is |
| A. | white dwarf |
| B. | yellow star |
| C. | blue giant |
| D. | red supergiant |
| Answer» E. | |
| 260. |
Alkaline has ph value above |
| A. | 10 |
| B. | 14 |
| C. | 4 |
| D. | 7 |
| Answer» E. | |
| 261. |
Acid rain is |
| A. | corrosive |
| B. | damage living things |
| C. | damage buildings |
| D. | all of above |
| Answer» E. | |
| 262. |
In hydroponics, roots of a plant are immersed in solution of dissolved |
| A. | mineral salts |
| B. | fertilizers |
| C. | chemicals |
| D. | oxygen |
| Answer» C. chemicals | |
| 263. |
A common and universal solvent is |
| A. | air |
| B. | water |
| C. | oxygen |
| D. | nitrogen |
| Answer» C. oxygen | |
| 264. |
The solution which can hold no more solute is called |
| A. | dilute solution |
| B. | saturated solution |
| C. | aqueous solution |
| D. | concentrated solution |
| Answer» C. aqueous solution | |
| 265. |
Nitric acid is combined with oxygen to produce brown fume of |
| A. | nitrogen oxide |
| B. | nitrogen dioxide |
| C. | carbon dioxide |
| D. | nitrogen |
| Answer» C. carbon dioxide | |
| 266. |
A substance which cannot be broken into further simpler substance by any chemical reaction is called |
| A. | element |
| B. | compound |
| C. | mixture |
| D. | solution |
| Answer» B. compound | |
| 267. |
Heating, exposing to light or passing electricity will only let to decompose |
| A. | element |
| B. | compound |
| C. | mixture |
| D. | liquid |
| Answer» C. mixture | |
| 268. |
Due to temperature sensitivity the element which is filled in thermometer, is |
| A. | mercury |
| B. | copper |
| C. | helium |
| D. | oxygen |
| Answer» B. copper | |
| 269. |
When iron and sulphur are mixed together at room temperature there is lack of |
| A. | reaction |
| B. | production of new product |
| C. | mixed reaction |
| D. | both a and b |
| Answer» E. | |
| 270. |
Most of the constellations in southern hemisphere were named by |
| A. | astronomers |
| B. | scientists |
| C. | physicians |
| D. | travelers |
| Answer» E. | |
| 271. |
Scientists get information about galaxies with the help of |
| A. | energy |
| B. | light |
| C. | sound |
| D. | radiations |
| Answer» E. | |
| 272. |
Small mass is incredibly |
| A. | light and cold |
| B. | light and hot |
| C. | dense and cold |
| D. | dense and hot |
| Answer» E. | |
| 273. |
The information sent by Ulysses is |
| A. | most useful |
| B. | less valuable |
| C. | important |
| D. | extremely valuable |
| Answer» C. important | |
| 274. |
After that gigantic explosion, our universe has been |
| A. | shrinking |
| B. | expanding |
| C. | exploding |
| D. | heating |
| Answer» C. exploding | |
| 275. |
On periodic table from left to right, elements change from metal to |
| A. | acids |
| B. | non metals |
| C. | alkalis |
| D. | metalloids |
| Answer» C. alkalis | |
| 276. |
All elements possess different |
| A. | physical properties |
| B. | chemical properties |
| C. | special properties |
| D. | both a and b |
| Answer» D. both a and b | |
| 277. |
Sand is made up of |
| A. | silicon |
| B. | oxygen |
| C. | glass |
| D. | both a and b |
| Answer» E. | |
| 278. |
"Cu" is symbol of |
| A. | copper |
| B. | cobalt |
| C. | curium |
| D. | carbon |
| Answer» B. cobalt | |
| 279. |
The elements that are named after famous scientists, are |
| A. | Curium |
| B. | Einsteinium |
| C. | Mendelevium |
| D. | all of above |
| Answer» E. | |
| 280. |
For protection of electrical appliances |
| A. | resistors can be used |
| B. | fuses can be used |
| C. | thick wires can be used |
| D. | thin wires can be used |
| Answer» C. thick wires can be used | |
| 281. |
When water is electrolyzed, the gas collected at cathode, is |
| A. | sulphur |
| B. | oxygen |
| C. | hydrogen |
| D. | sulphur dioxide |
| Answer» D. sulphur dioxide | |
| 282. |
The slowing down of electrons depends upon |
| A. | material |
| B. | mass of conductor |
| C. | volume of conductor |
| D. | length of conductor |
| Answer» B. mass of conductor | |
| 283. |
A part of an electric circuit which is used to limit the amount of electric current flowing through the circuit is known as |
| A. | diode |
| B. | thermistor |
| C. | radiator |
| D. | resistor |
| Answer» B. thermistor | |
| 284. |
Radio, TV, CD Player and sound system have |
| A. | loudspeakers |
| B. | microphones |
| C. | antennas |
| D. | cathode tubes |
| Answer» B. microphones | |
| 285. |
Huge magnets are used to carry |
| A. | scrap iron and steel |
| B. | current in the circuit |
| C. | ions in the breakers |
| D. | airplanes from one airport to another |
| Answer» B. current in the circuit | |
| 286. |
Keep 'TV' and other electric appliances away from |
| A. | floors |
| B. | wooden desks |
| C. | wet places |
| D. | roofs |
| Answer» D. roofs | |
| 287. |
When the current is passed through the solution of copper sulphate, the copper sulphate turns into |
| A. | atoms |
| B. | ions |
| C. | allotropes |
| D. | isotopes |
| Answer» C. allotropes | |
| 288. |
Normally electric appliances have power rating |
| A. | marked on them |
| B. | above 100kW |
| C. | below 1W |
| D. | written in their booklets |
| Answer» B. above 100kW | |
| 289. |
The consumption of amount of electrical energy depends on |
| A. | one thing |
| B. | two things |
| C. | three things |
| D. | four things |
| Answer» D. four things | |
| 290. |
The percentage of noble gases in air is |
| A. | 0.2095 |
| B. | 0.78 |
| C. | 0.009 |
| D. | 0.0003 |
| Answer» D. 0.0003 | |
| 291. |
For purification water is passed through |
| A. | sand |
| B. | colander |
| C. | watch glass |
| D. | strainer |
| Answer» B. colander | |
| 292. |
Nitrogen helps in preparation of nitrogen based |
| A. | plants |
| B. | fertilizers |
| C. | seeds |
| D. | trees |
| Answer» C. seeds | |
| 293. |
Balloons are filled with |
| A. | carbon dioxide |
| B. | oxygen |
| C. | helium |
| D. | nitrogen |
| Answer» D. nitrogen | |
| 294. |
A technique which is used to desalinate water, is |
| A. | reverse osmosis |
| B. | distillation |
| C. | filtration |
| D. | heating |
| Answer» B. distillation | |
| 295. |
An example of good conductor of heat is |
| A. | copper |
| B. | glass |
| C. | water |
| D. | plastic |
| Answer» B. glass | |
| 296. |
A perfectly empty 'space' without air is known as |
| A. | vacuum |
| B. | lithosphere |
| C. | atmosphere |
| D. | exosphere |
| Answer» B. lithosphere | |
| 297. |
The light cannot travel from sun to earth by |
| A. | convection only |
| B. | conduction only |
| C. | conduction and convection both |
| D. | radiation only |
| Answer» D. radiation only | |
| 298. |
Infrared radiations are also called |
| A. | latent heat |
| B. | black heat |
| C. | invisible heat |
| D. | visible heat |
| Answer» C. invisible heat | |
| 299. |
Weather is an example of |
| A. | conduction current |
| B. | convection current |
| C. | radiation current |
| D. | air current |
| Answer» C. radiation current | |
| 300. |
A food item which is wasted most, is |
| A. | meat |
| B. | vegetables |
| C. | grains |
| D. | water |
| Answer» E. | |