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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.
| 1501. |
Echoes are formed when sound |
| A. | strikes a wall and reflects back |
| B. | strikes a wall and is absorbed |
| C. | hits the eardrum repeatedly |
| D. | breaks |
| Answer» B. strikes a wall and is absorbed | |
| 1502. |
The mixture of high and low sounds is called a |
| A. | rhythm |
| B. | bass effect |
| C. | beat effect |
| D. | wow effect |
| Answer» B. bass effect | |
| 1503. |
Measure of decibel starts from |
| A. | 0 |
| B. | 20 |
| C. | 20000 |
| D. | 10 |
| Answer» B. 20 | |
| 1504. |
Old constellation names refer to the areas of sky instead of |
| A. | animals |
| B. | heroes |
| C. | heroines |
| D. | mythical figures |
| Answer» E. | |
| 1505. |
Scientists believe that Sun started its life about |
| A. | 5,000 years ago |
| B. | 5 million years ago |
| C. | 5 billion years ago |
| D. | 5 trillion years ago |
| Answer» D. 5 trillion years ago | |
| 1506. |
The brightness of 'Sirius-A' is |
| A. | 23 times of the Sun |
| B. | 17 times of the Sun |
| C. | 20 times of the Sun |
| D. | 5 times of the Sun |
| Answer» B. 17 times of the Sun | |
| 1507. |
After cooling down, sun will turn from red supergiant to |
| A. | blue giant |
| B. | white dwarf |
| C. | yellow star |
| D. | moon |
| Answer» C. yellow star | |
| 1508. |
About half of stars we see in night are |
| A. | galaxies |
| B. | comets |
| C. | pair of stars |
| D. | asteroids |
| Answer» D. asteroids | |
| 1509. |
The water bodies smaller than oceans are known as |
| A. | lakes |
| B. | ponds |
| C. | seas |
| D. | rivers |
| Answer» D. rivers | |
| 1510. |
Untreated sewage should not be pumped into |
| A. | water tanks |
| B. | water reservoirs |
| C. | rivers and streams |
| D. | oceans |
| Answer» D. oceans | |
| 1511. |
In snowy regions, most of the fresh water is in the form of |
| A. | vapors |
| B. | snow |
| C. | ice |
| D. | all of above |
| Answer» E. | |
| 1512. |
Trachoma is caused due to the presence of |
| A. | insects |
| B. | bacteria |
| C. | viruses |
| D. | parasites |
| Answer» C. viruses | |
| 1513. |
Scientists believe that eight out of ten people in under developed countries suffer from diseases due to |
| A. | polluted water |
| B. | bacterial food |
| C. | contaminated food |
| D. | salty water |
| Answer» B. bacterial food | |
| 1514. |
The sun looks to us the brightest star of the solar system because it is hundred and thousand times close to us than other |
| A. | galaxies |
| B. | comets |
| C. | stars |
| D. | black holes |
| Answer» D. black holes | |
| 1515. |
Huge explosions over the surface of sun are known as |
| A. | sun flares |
| B. | solar flares |
| C. | solar explosions |
| D. | sunspots |
| Answer» C. solar explosions | |
| 1516. |
The center of the sun is made up of |
| A. | helium gas |
| B. | hydrogen gas |
| C. | nitrogen gas |
| D. | oxygen gas |
| Answer» C. nitrogen gas | |
| 1517. |
The cosmic explosion that is hypothesized to have marked the origin of the universe was |
| A. | Big bang |
| B. | Big boom |
| C. | Boom |
| D. | Big bang boom |
| Answer» B. Big boom | |
| 1518. |
The special equipment which astronomers use to separate light of a star is |
| A. | prism |
| B. | spectrum |
| C. | sound |
| D. | wave |
| Answer» C. sound | |
| 1519. |
The temperature of surface of sun is |
| A. | 1000 °C |
| B. | 2500 °C |
| C. | 4000 °C |
| D. | 5500 °C |
| Answer» E. | |
| 1520. |
After turning of sun into red supergiant, the outer layers of sun will start turning into |
| A. | discs of gases |
| B. | balls of dust |
| C. | clouds of gases |
| D. | clouds of asteroids |
| Answer» D. clouds of asteroids | |
| 1521. |
The stars in a spiral galaxy are |
| A. | old age, middle age and young |
| B. | yellow stars, blue giants and red super giants |
| C. | orange stars, red giants and blue supergiants |
| D. | dwarfs, giants and super giants |
| Answer» B. yellow stars, blue giants and red super giants | |
| 1522. |
Contemporary, sun to the stage of red supergiant, it would take approximately |
| A. | 10 years |
| B. | thousands of years |
| C. | millions of years |
| D. | zillions of years |
| Answer» D. zillions of years | |
| 1523. |
The smaller stars live for much |
| A. | longer period |
| B. | shorter period |
| C. | both a and b |
| D. | lesser period |
| Answer» B. shorter period | |
| 1524. |
When ethene and chlorine combine together, they form |
| A. | chlorine ethenide |
| B. | ethene chloride |
| C. | ethene dichloride |
| D. | ethene trichloride |
| Answer» D. ethene trichloride | |
| 1525. |
The properties of 'plastic' depends on |
| A. | molecules and their arrangement |
| B. | linked atoms |
| C. | type of hydrocarbon |
| D. | properties of elements |
| Answer» B. linked atoms | |
| 1526. |
In the process of forming iron sulfide by iron and sulphur, the reactant is |
| A. | iron only |
| B. | sulphur only |
| C. | iron and sulphur both |
| D. | sulphuric acid |
| Answer» D. sulphuric acid | |
| 1527. |
The name of the oil from which ethene is obtained is |
| A. | naphtha |
| B. | kerosene |
| C. | diesel |
| D. | bitumen |
| Answer» B. kerosene | |
| 1528. |
Oils is separated from crude oil through the process of |
| A. | simple distillation |
| B. | fractional distillation |
| C. | filtration |
| D. | vaporization |
| Answer» C. filtration | |
| 1529. |
'Refractive index' of quartz is |
| A. | 1.54 |
| B. | 1.34 |
| C. | 2.04 |
| D. | 1.72 |
| Answer» B. 1.34 | |
| 1530. |
The speed of light in 'vacuum' is |
| A. | 3,000 km/s |
| B. | 30,000 km/s |
| C. | 300,000 km/s |
| D. | 3,000,000 km/s |
| Answer» D. 3,000,000 km/s | |
| 1531. |
The critical angle for ice is |
| A. | 47 Degree |
| B. | 49 Degree |
| C. | 50 Degree |
| D. | 45 Degree |
| Answer» C. 50 Degree | |
| 1532. |
When light enters a dense medium, it |
| A. | speeds up |
| B. | slows down |
| C. | increases its frequency |
| D. | increases its wavelength |
| Answer» C. increases its frequency | |
| 1533. |
The critical angle for "Perspex" is |
| A. | 40 degree |
| B. | 42 degree |
| C. | 44 degree |
| D. | 46 degree |
| Answer» C. 44 degree | |
| 1534. |
Refraction of light in 'atmosphere' causes |
| A. | eye damage |
| B. | mirages |
| C. | dizziness |
| D. | blindness |
| Answer» C. dizziness | |
| 1535. |
The concave lens |
| A. | shrinks the image |
| B. | magnifies the image |
| C. | sharpens the images |
| D. | increases the contrast of image |
| Answer» B. magnifies the image | |
| 1536. |
Light in extremely denser medium is |
| A. | reflected back again and again |
| B. | refracted again and again |
| C. | refracted at reflex angle |
| D. | finally finishes |
| Answer» B. refracted again and again | |
| 1537. |
Names of the types of lenses are |
| A. | convex and biconvex |
| B. | concave and biconcave |
| C. | biconvex and biconcave |
| D. | convex and concave |
| Answer» E. | |
| 1538. |
'Refractive index' is equal to |
| A. | speed of light in material /speed of light in vacuum |
| B. | speed of light in material/speed of light in air |
| C. | speed of light in vacuum/speed of light in material |
| D. | speed of light in vacuum/speed of light in air |
| Answer» D. speed of light in vacuum/speed of light in air | |
| 1539. |
The smallest particle of water is |
| A. | element |
| B. | atom |
| C. | molecule |
| D. | neutron |
| Answer» D. neutron | |
| 1540. |
A tiny dense nucleus in an atom was discovered by |
| A. | Greek scientist |
| B. | Roman philosopher |
| C. | New Zealand-born physicist |
| D. | British mathematician |
| Answer» D. British mathematician | |
| 1541. |
The symbol of "Fluorine" is |
| A. | C |
| B. | N |
| C. | O |
| D. | Fl |
| Answer» E. | |
| 1542. |
Generally sodium chloride is known as |
| A. | Poisonous salt |
| B. | Table salt |
| C. | Chinese salt |
| D. | Japanese salt |
| Answer» C. Chinese salt | |
| 1543. |
To date, scientists have made about 26 millions |
| A. | elements |
| B. | compounds |
| C. | alkalis |
| D. | alkanes |
| Answer» C. alkalis | |
| 1544. |
Nuclear batteries are |
| A. | small in size |
| B. | very heavy |
| C. | harmful |
| D. | enlarge in size |
| Answer» B. very heavy | |
| 1545. |
The ionic chemical formula of potassium is |
| A. | K- |
| B. | K+ |
| C. | K- |
| D. | K+ |
| Answer» C. K- | |
| 1546. |
The radioactive isotope of carbon is |
| A. | carbon-12 |
| B. | carbon-13 |
| C. | carbon-14 |
| D. | carbon-6 |
| Answer» D. carbon-6 | |
| 1547. |
Most of the covalent compounds are found in |
| A. | solid state |
| B. | gaseous state |
| C. | liquid state |
| D. | both in liquid and gaseous state |
| Answer» E. | |
| 1548. |
The atomic number of sodium is 11 and its atomic mass is 23 and the number of protons and neutrons in an atom of sodium is |
| A. | 11 and 11 |
| B. | 11 and 23 |
| C. | 23 and 11 |
| D. | 11 and 12 |
| Answer» E. | |
| 1549. |
The speed of sound in wood is |
| A. | 2000 m/s |
| B. | 3000 m/s |
| C. | 4000 m/s |
| D. | 5000 m/s |
| Answer» D. 5000 m/s | |
| 1550. |
The denser the solid, the |
| A. | more the speed of sound |
| B. | less the speed of sound |
| C. | more clear the sound |
| D. | less clear the sound |
| Answer» B. less the speed of sound | |