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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.
| 1401. |
Solar flares are associated with |
| A. | sunspots |
| B. | sun blasts |
| C. | dark spots |
| D. | sunlight |
| Answer» B. sun blasts | |
| 1402. |
The maximum mass of a neutron star is |
| A. | three solar masses |
| B. | four solar masses |
| C. | five solar masses |
| D. | 2.01M |
| Answer» E. | |
| 1403. |
The enormous distance prevent us seeing the stars in the universe even with a powerful |
| A. | binocular |
| B. | satellite |
| C. | telescope |
| D. | space probe |
| Answer» D. space probe | |
| 1404. |
In the sun, a process that produces huge amount of energy takes place. It is called |
| A. | nuclear fusion |
| B. | nuclear fission |
| C. | atomic explosion |
| D. | hydrogen explosion |
| Answer» B. nuclear fission | |
| 1405. |
Unlike sound, light depends on |
| A. | source |
| B. | wavelength |
| C. | medium |
| D. | frequency |
| Answer» D. frequency | |
| 1406. |
Each ray of light is |
| A. | reflected in the droplet |
| B. | refracted in the droplet |
| C. | dispersed in the droplet |
| D. | converted to other forms of light in the droplet |
| Answer» D. converted to other forms of light in the droplet | |
| 1407. |
Yellow lights stimulate |
| A. | red and blue cones |
| B. | red and green rods |
| C. | red and green cones |
| D. | red and blue rods |
| Answer» D. red and blue rods | |
| 1408. |
The critical angle for glass is |
| A. | 40 degree |
| B. | 41 degree |
| C. | 42 degree |
| D. | 43 degree |
| Answer» C. 42 degree | |
| 1409. |
The use of total internal 'reflection' of light is to |
| A. | shape diamonds |
| B. | straighten mirrors |
| C. | check the surface of glass |
| D. | check the density of liquids |
| Answer» B. straighten mirrors | |
| 1410. |
The star that is less than one and a half of the mass of sun with blowing outer layer off and leaving a tiny cool mass is called |
| A. | blue giant |
| B. | yellow star |
| C. | white dwarf |
| D. | black dwarf |
| Answer» D. black dwarf | |
| 1411. |
In ancient times, people divided bright stars into |
| A. | horoscopes |
| B. | constellations |
| C. | prominence |
| D. | ptolemy |
| Answer» C. prominence | |
| 1412. |
The positioning of stars in a galaxy gives it a central bulge, from which arms spread out like a gigantic |
| A. | jellyfish |
| B. | lionfish |
| C. | starfish |
| D. | octopus |
| Answer» D. octopus | |
| 1413. |
As compare to Sirius A, the Sirius B is |
| A. | much bright |
| B. | much dim |
| C. | normal |
| D. | small |
| Answer» C. normal | |
| 1414. |
Currently, sun is a yellow star which will turn into |
| A. | white dwarf |
| B. | blue giant |
| C. | red supergiant |
| D. | yellow giant |
| Answer» D. yellow giant | |
| 1415. |
Astronomers tuned up their telescopes to pick up radio waves from |
| A. | close galaxies |
| B. | distant galaxies |
| C. | close stars |
| D. | close clusters |
| Answer» C. close stars | |
| 1416. |
Scientists believe that the whole universe is |
| A. | shrinking |
| B. | expanding |
| C. | destroying |
| D. | vanishing |
| Answer» C. destroying | |
| 1417. |
At light speed, reaching to sun from earth it will take approximately |
| A. | 8 seconds |
| B. | 8 minutes |
| C. | 8 days |
| D. | 8 years |
| Answer» C. 8 days | |
| 1418. |
Ptolemy lived from 120 AD to |
| A. | 170 AD |
| B. | 180 AD |
| C. | 190 AD |
| D. | 200 AD |
| Answer» C. 190 AD | |
| 1419. |
If galaxies further move apart, hydrogen will be used in the production of new |
| A. | planets |
| B. | stars |
| C. | galaxies |
| D. | clusters |
| Answer» C. galaxies | |
| 1420. |
The removal of particles settled at the bottom of a tank is called |
| A. | coagulation |
| B. | sedimentation |
| C. | filtration |
| D. | chlorination |
| Answer» C. filtration | |
| 1421. |
In country area, untreated sewage is pumped into tanks known as |
| A. | septic tanks |
| B. | sewage tanks |
| C. | grit tanks |
| D. | sludge tanks |
| Answer» B. sewage tanks | |
| 1422. |
For drinking, distilled water is |
| A. | suitable |
| B. | not suitable |
| C. | poisonous |
| D. | not preferable |
| Answer» C. poisonous | |
| 1423. |
Whether we obtain tap water or water from well, it originally comes from |
| A. | sea |
| B. | ocean |
| C. | river |
| D. | rain |
| Answer» E. | |
| 1424. |
For desalination plant, the first priority is |
| A. | reserves of natural gas |
| B. | reserves of water |
| C. | reserves of oil |
| D. | reserves of coal |
| Answer» D. reserves of coal | |
| 1425. |
Roots obtain oxygen from air spaces |
| A. | in the soil |
| B. | above the soil |
| C. | both a and b |
| D. | on the soil |
| Answer» B. above the soil | |
| 1426. |
Behind the layer of cells there is a tiny tube like growth which is known as |
| A. | small roots |
| B. | root cap |
| C. | root hairs |
| D. | more roots |
| Answer» D. more roots | |
| 1427. |
The process in which gases move in and out of a plant is called |
| A. | diffusion |
| B. | osmosis |
| C. | active transport |
| D. | suction |
| Answer» B. osmosis | |
| 1428. |
When the rate of respiration is slower than the rate of photosynthesis, the carbon dioxide gas is |
| A. | exchanged |
| B. | taken in |
| C. | given out |
| D. | transferred to roots |
| Answer» C. given out | |
| 1429. |
The process in which the particles move from lower concentration to higher concentration is known as |
| A. | diffusion |
| B. | osmosis |
| C. | active transport |
| D. | translocation |
| Answer» D. translocation | |
| 1430. |
Oranges and lemon are sour due to the presence of |
| A. | citrus acid |
| B. | acetic acid |
| C. | citric acid |
| D. | carbonic acid |
| Answer» B. acetic acid | |
| 1431. |
The color of concentrated copper sulphate solution appears |
| A. | light blue |
| B. | dark blue |
| C. | violet |
| D. | indigo |
| Answer» C. violet | |
| 1432. |
Nature of solute has an effect on its |
| A. | solubility |
| B. | reaction |
| C. | distillation |
| D. | purification |
| Answer» B. reaction | |
| 1433. |
Some acids react and burn skin if they come in contact with it. They are |
| A. | corrosive |
| B. | strong |
| C. | light |
| D. | both a and b |
| Answer» D. both a and b | |
| 1434. |
The elements in air that are responsible for acid rain include |
| A. | oxides of nitrogen |
| B. | sulphur dioxide |
| C. | carbon dioxide |
| D. | both a and b |
| Answer» D. both a and b | |
| 1435. |
Litters such as plastic bags are harmful for |
| A. | fish |
| B. | turtles |
| C. | alligators |
| D. | plants |
| Answer» C. alligators | |
| 1436. |
The remains of salt over the soil after evaporation of water is known as |
| A. | water logging |
| B. | salivation |
| C. | dehydration |
| D. | hydration |
| Answer» E. | |
| 1437. |
Chlorine helps |
| A. | to kill bacteria |
| B. | in heating water |
| C. | in cooling water |
| D. | to evaporate water |
| Answer» B. in heating water | |
| 1438. |
The waste water from houses, buildings and other areas is called |
| A. | waste water |
| B. | sewage |
| C. | seepage |
| D. | aquarium waste |
| Answer» C. seepage | |
| 1439. |
Water supply through pipelines and tube wells to farm is known as |
| A. | fertilization |
| B. | hydration |
| C. | irrigation |
| D. | pollination |
| Answer» D. pollination | |
| 1440. |
The liquid in which any salt gets dissolved is called a |
| A. | solute |
| B. | solvent |
| C. | mixture |
| D. | product |
| Answer» C. mixture | |
| 1441. |
In dry form copper sulphate crystals and sodium hydroxide pellets |
| A. | do no react |
| B. | react vigorously |
| C. | react slowly |
| D. | dissolve completely |
| Answer» B. react vigorously | |
| 1442. |
The solubility of a solid solute will increase with the increase of |
| A. | mass |
| B. | volume |
| C. | temperature |
| D. | pressure |
| Answer» D. pressure | |
| 1443. |
Dilute acids form hydrogen gas when they react with |
| A. | reactive carbonates |
| B. | reactive metals |
| C. | oxides |
| D. | amino acids |
| Answer» C. oxides | |
| 1444. |
Acidic solutions are very good conductors of |
| A. | electricity |
| B. | gases |
| C. | heat |
| D. | solute |
| Answer» B. gases | |
| 1445. |
Wasp sting is neutralized by rubbing skin with |
| A. | soap |
| B. | orange juice |
| C. | vinegar |
| D. | anti acid |
| Answer» D. anti acid | |
| 1446. |
A reaction in which an acid and alkali react together to form salt and water is called |
| A. | chemical reaction |
| B. | physical reaction |
| C. | potential reaction |
| D. | heat reaction |
| Answer» B. physical reaction | |
| 1447. |
If pH value is less than 7, nature is |
| A. | acidic |
| B. | basic |
| C. | neutral |
| D. | normal |
| Answer» B. basic | |
| 1448. |
The maximum amount of solute which can dissolve in 100g of solvent at room temperature is called |
| A. | solubility |
| B. | capacity |
| C. | eligibility |
| D. | tendency |
| Answer» B. capacity | |
| 1449. |
A dye or a mixture of dye which changes color according to the acidity or alkalinity of any substance is called |
| A. | indicator |
| B. | pH scale |
| C. | pH meter |
| D. | balance scale |
| Answer» B. pH scale | |
| 1450. |
The sensitive screen at the back of eye is called |
| A. | blind spot |
| B. | conjunctiva |
| C. | cornea |
| D. | retina |
| Answer» E. | |