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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.
| 401. |
Many machines we use, are powered by |
| A. | thermal energy |
| B. | sound energy |
| C. | electric motors |
| D. | dynamos |
| Answer» D. dynamos | |
| 402. |
Electric motor changes electrical energy into |
| A. | potential energy |
| B. | thermal energy |
| C. | heat energy |
| D. | kinetic energy |
| Answer» E. | |
| 403. |
The wires that are used in supplying electrical energy to the consumers are made of |
| A. | copper |
| B. | silver |
| C. | chromium |
| D. | aluminum |
| Answer» E. | |
| 404. |
Electricity meter records the amount of |
| A. | used power |
| B. | used electricity |
| C. | used resistance |
| D. | units |
| Answer» C. used resistance | |
| 405. |
The poison gets more concentrated as it moves through |
| A. | water |
| B. | food chain |
| C. | fish body |
| D. | vascular bundles in aquatic plants |
| Answer» C. fish body | |
| 406. |
As compare to hose for car washing, bucketing uses |
| A. | less water |
| B. | more water |
| C. | equal water |
| D. | maybe less water or more |
| Answer» B. more water | |
| 407. |
The percentage of salty water is |
| A. | 0.8 |
| B. | 0.9 |
| C. | 0.95 |
| D. | 0.97 |
| Answer» E. | |
| 408. |
When algae grows on the surface of water, it prevents |
| A. | access of bacteria in water |
| B. | access of sunlight in water |
| C. | growth of fungi |
| D. | growth of ferns and mosses |
| Answer» C. growth of fungi | |
| 409. |
Desalination plant is very expensive because it |
| A. | uses a large amount of fuel |
| B. | is built on mountains and high lands |
| C. | uses electric machinery for desalination |
| D. | is built with expensive material |
| Answer» B. is built on mountains and high lands | |
| 410. |
At night when we look up, we see |
| A. | airplanes in the sky |
| B. | moons in the sky |
| C. | planets in the sky |
| D. | stars and galaxies in the sky |
| Answer» E. | |
| 411. |
As a star collapses itself, it becomes extremely |
| A. | hot |
| B. | cold |
| C. | dense |
| D. | small |
| Answer» D. small | |
| 412. |
After supernova, the core may remain as a |
| A. | white hole |
| B. | neutral star |
| C. | black hole |
| D. | neutral star or black hole |
| Answer» E. | |
| 413. |
Radiations help us to measure the movement of |
| A. | galaxies |
| B. | stars |
| C. | solar system |
| D. | planets |
| Answer» B. stars | |
| 414. |
The brightest star that can be seen from earth is |
| A. | Deneb |
| B. | Sirius |
| C. | Aldebaran |
| D. | Rigel |
| Answer» C. Aldebaran | |
| 415. |
The atomic number of hydrogen is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 416. |
The atomic number of helium is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 417. |
Oxygen is a diatomic gas so its chemical formula is |
| A. | O2 |
| B. | O2 |
| C. | O |
| D. | Ox |
| Answer» C. O | |
| 418. |
In methane gas, each carbon atom is bonded with |
| A. | two oxygen atoms |
| B. | two hydrogen atoms |
| C. | three oxygen atoms |
| D. | four hydrogen atoms |
| Answer» E. | |
| 419. |
Isotopes behave the same way in |
| A. | chemical reaction |
| B. | bonding |
| C. | electrical conductivity |
| D. | physical reaction |
| Answer» B. bonding | |
| 420. |
The third effecter of sound created by vibrating strings is |
| A. | angle of strings |
| B. | thickness of strings |
| C. | material of strings |
| D. | height of strings |
| Answer» C. material of strings | |
| 421. |
We cannot hear alarm of a clock if there is |
| A. | vacuum in the jar |
| B. | air in the jar |
| C. | liquid in the jar |
| D. | solid in the jar |
| Answer» B. air in the jar | |
| 422. |
Loud noise can |
| A. | damage our ears |
| B. | make us ill |
| C. | disturb our sleep |
| D. | interrupt conversation |
| Answer» B. make us ill | |
| 423. |
The only thing of a note that can vary, is |
| A. | amplitude |
| B. | length |
| C. | wave |
| D. | type |
| Answer» C. wave | |
| 424. |
Vibrations are caused due to |
| A. | change of temperature of air |
| B. | change of pressure in air |
| C. | effect of humidity on air |
| D. | level of heat in air |
| Answer» C. effect of humidity on air | |
| 425. |
In mixture, the particles of iron and sulphur are |
| A. | separate |
| B. | chemically bonded |
| C. | biologically bonded |
| D. | permanently bonded |
| Answer» B. chemically bonded | |
| 426. |
The common products in which ammonia is used, are |
| A. | lubricants |
| B. | detergents |
| C. | perfumes |
| D. | deodorants |
| Answer» C. perfumes | |
| 427. |
'Liquids' flow |
| A. | only if boiled |
| B. | hardly |
| C. | more than solids but less than gases |
| D. | more than gases but less than solids |
| Answer» D. more than gases but less than solids | |
| 428. |
The essential mineral for plants other than ammonia, is |
| A. | potassium |
| B. | sodium |
| C. | phosphorus |
| D. | uranium |
| Answer» D. uranium | |
| 429. |
'Plastic' is made of |
| A. | amines |
| B. | alkanes |
| C. | hydrocarbons |
| D. | alcohols |
| Answer» D. alcohols | |
| 430. |
Objects that let some light to pass through are known as |
| A. | transparent objects |
| B. | opaque objects |
| C. | translucent objects |
| D. | half transparent objects |
| Answer» D. half transparent objects | |
| 431. |
When light enters a denser medium, it bends |
| A. | away from the normal |
| B. | towards the normal |
| C. | away from the plane |
| D. | towards the plane |
| Answer» C. away from the plane | |
| 432. |
The color that is not part of the spectrum is |
| A. | blue |
| B. | brown |
| C. | indigo |
| D. | violet |
| Answer» C. indigo | |
| 433. |
Our brain mixes the colors by |
| A. | mixing the rods |
| B. | mixing the cones |
| C. | combining the signals from rods |
| D. | combining the signals from cones |
| Answer» E. | |
| 434. |
Atoms have same number of |
| A. | protons and neutrons |
| B. | electrons and neutrons |
| C. | electrons and protons |
| D. | positrons and photons |
| Answer» D. positrons and photons | |
| 435. |
Another example of a good electric conductor is |
| A. | gold |
| B. | copper |
| C. | steel |
| D. | plastic |
| Answer» C. steel | |
| 436. |
Each component of circuit is shown by a particular |
| A. | alphabet |
| B. | symbol |
| C. | digit |
| D. | script |
| Answer» C. digit | |
| 437. |
To remove a steel splinter from a patient's eye, the surgeon may use |
| A. | clips |
| B. | electric current |
| C. | coils |
| D. | electromagnets |
| Answer» E. | |
| 438. |
For the current to flow, each resistor in parallel circuit provides |
| A. | alternate route |
| B. | same route |
| C. | parallel route |
| D. | perpendicular route |
| Answer» B. same route | |
| 439. |
If we melt magnesium, it would start to give |
| A. | yellow glow |
| B. | white light |
| C. | orange glow |
| D. | blue shine |
| Answer» C. orange glow | |
| 440. |
Global warming causes |
| A. | extreme weather and climate changes |
| B. | extreme cold in summer |
| C. | skin cancers |
| D. | skin burns |
| Answer» B. extreme cold in summer | |
| 441. |
The excessive loss of heat is also harmful for |
| A. | environment |
| B. | surroundings |
| C. | trees and forests |
| D. | glaciers |
| Answer» B. surroundings | |
| 442. |
The inner two walls of the flask are made of |
| A. | steel |
| B. | metalloid |
| C. | glass |
| D. | metal |
| Answer» D. metal | |
| 443. |
For transferring of heat, conduction and convection need a |
| A. | vacuum |
| B. | space |
| C. | sphere |
| D. | medium |
| Answer» E. | |
| 444. |
Bears have strong legs so that they can |
| A. | walk long distances in search of food |
| B. | climb mountains |
| C. | take down preys |
| D. | swim easily |
| Answer» B. climb mountains | |
| 445. |
The fur of 'moles' is |
| A. | hard |
| B. | spiky |
| C. | smooth but sticky |
| D. | short and velvety |
| Answer» E. | |
| 446. |
When plants and animals die, they are decomposed by |
| A. | scavengers |
| B. | detritivores |
| C. | primary consumers |
| D. | primary producers |
| Answer» C. primary consumers | |
| 447. |
Leaves of cactus are like small spines to |
| A. | prevent excess water loss by evaporation |
| B. | prevent predators from eating |
| C. | prevent excess sunlight to be absorbed |
| D. | |
| Answer» B. prevent predators from eating | |
| 448. |
'Moles' feed on |
| A. | roundworms |
| B. | earthworms |
| C. | mice |
| D. | birds |
| Answer» C. mice | |
| 449. |
Protons and neutrons have |
| A. | charge |
| B. | mass |
| C. | energy |
| D. | sound |
| Answer» C. energy | |
| 450. |
An atom of 'hydrogen' has |
| A. | one proton and one electron |
| B. | one proton, one neutron and one electron |
| C. | one proton and one neutron |
| D. | one electron and one neutron |
| Answer» B. one proton, one neutron and one electron | |