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.
| 1351. |
Inner core of planets are made up of |
| A. | gases |
| B. | stones |
| C. | rocks |
| D. | water |
| Answer» D. water | |
| 1352. |
The inner planets and outer planets are separated by the help of a |
| A. | asteroid belt |
| B. | galaxy belt |
| C. | planets belt |
| D. | space belt |
| Answer» B. galaxy belt | |
| 1353. |
The extreme change in temperature from day to night, is protected by |
| A. | atmosphere |
| B. | lithosphere |
| C. | biosphere |
| D. | hydrosphere |
| Answer» B. lithosphere | |
| 1354. |
A thick layer of gases around the earth is called |
| A. | atmosphere |
| B. | lithosphere |
| C. | biosphere |
| D. | hydrosphere |
| Answer» B. lithosphere | |
| 1355. |
In an atom of carbon, electronic configuration is |
| A. | 2 electrons in K shell and 4 in M shell |
| B. | 2 electrons in L shell and 4 in M shell |
| C. | 2 electrons in K shell and 4 in L shell |
| D. | 4 electrons in K shell and 2 in L shell |
| Answer» D. 4 electrons in K shell and 2 in L shell | |
| 1356. |
When salt is formed, sodium |
| A. | gives an electron to chlorine |
| B. | takes an electron from chlorine |
| C. | shares an electron with chlorine |
| D. | takes a proton from chlorine |
| Answer» B. takes an electron from chlorine | |
| 1357. |
Atoms of different elements differ from each other because of |
| A. | difference in color |
| B. | difference in size |
| C. | difference in shape |
| D. | difference in particle numbers |
| Answer» E. | |
| 1358. |
One molecule of carbon dioxide consists of |
| A. | one carbon and two oxygen atoms |
| B. | one carbon and oxygen atom |
| C. | two carbon and one oxygen atom |
| D. | two carbon and one oxygen atoms |
| Answer» B. one carbon and oxygen atom | |
| 1359. |
The 'isotope' carbon-12 makes up about |
| A. | 90% of carbon on earth |
| B. | 80% of carbon on earth |
| C. | 99% of carbon on earth |
| D. | 89% of carbon on earth |
| Answer» D. 89% of carbon on earth | |
| 1360. |
Water contains |
| A. | ionic bonding |
| B. | covalent bonding |
| C. | metallic bonding |
| D. | dative bonding |
| Answer» C. metallic bonding | |
| 1361. |
Every element has its own |
| A. | valency |
| B. | isotope |
| C. | atom |
| D. | state |
| Answer» D. state | |
| 1362. |
The number of important particles in an atom is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 1363. |
The symbol of "sodium" is |
| A. | Ne |
| B. | Na |
| C. | N |
| D. | Mg |
| Answer» C. N | |
| 1364. |
If we add an electron to the outermost shell of an atom, the charge turns |
| A. | negative |
| B. | positive |
| C. | neutral |
| D. | unchanged |
| Answer» B. positive | |
| 1365. |
William Sturgeon made first electromagnet in |
| A. | 1820 |
| B. | 1825 |
| C. | 1920 |
| D. | 1925 |
| Answer» C. 1920 | |
| 1366. |
When small hammer is attracted by electromagnet, the bell |
| A. | sparks |
| B. | vibrates |
| C. | stops |
| D. | strucks |
| Answer» E. | |
| 1367. |
Fuses work only |
| A. | in daylight |
| B. | twice |
| C. | once |
| D. | in moonlight |
| Answer» D. in moonlight | |
| 1368. |
As electrons pass through a bulb, they use |
| A. | energy |
| B. | charge |
| C. | power |
| D. | resistance |
| Answer» B. charge | |
| 1369. |
Some appliances cost more because they need more |
| A. | power |
| B. | space |
| C. | energy |
| D. | electricity |
| Answer» D. electricity | |
| 1370. |
An example of use of electricity is |
| A. | heating |
| B. | flushing |
| C. | pasting |
| D. | brushing |
| Answer» B. flushing | |
| 1371. |
In walk through gates a large coil of wire carries |
| A. | voltage |
| B. | magnet |
| C. | current |
| D. | electricity |
| Answer» D. electricity | |
| 1372. |
Ions are charged particles. They are formed when an atom |
| A. | gains electrons |
| B. | loses electrons |
| C. | gains or loses electrons |
| D. | shares electrons |
| Answer» D. shares electrons | |
| 1373. |
The measure of energy provided by a cell is known as |
| A. | voltage |
| B. | resistance |
| C. | current |
| D. | power |
| Answer» B. resistance | |
| 1374. |
An analog ammeter has |
| A. | Digits |
| B. | Needle |
| C. | Roman numbers |
| D. | Arabic digits |
| Answer» C. Roman numbers | |
| 1375. |
Never run a wire under |
| A. | floor |
| B. | pool |
| C. | carpet |
| D. | sofa |
| Answer» C. carpet | |
| 1376. |
Every time a fuse melts, you have to |
| A. | change the wire |
| B. | change the fuse |
| C. | replace the plug |
| D. | replace the circuit breaker |
| Answer» C. replace the plug | |
| 1377. |
'Voltage' is measured by |
| A. | ohms (Omega) |
| B. | ampere (A) |
| C. | watts (W) |
| D. | volts (V) |
| Answer» E. | |
| 1378. |
The resistor that contains a long coil of 'nichrome' is known as |
| A. | variable resistor |
| B. | thermistor |
| C. | transistor |
| D. | fixed resistor |
| Answer» B. thermistor | |
| 1379. |
If two cells are connected in series, the voltage will be |
| A. | halved |
| B. | doubled |
| C. | tripled |
| D. | quartered |
| Answer» C. tripled | |
| 1380. |
Even the best electrical conductor contains some |
| A. | current |
| B. | power |
| C. | resistance |
| D. | voltage |
| Answer» D. voltage | |
| 1381. |
Nichrome is used in electric appliances because it has |
| A. | high resistance |
| B. | high melting point |
| C. | high resistance and melting point |
| D. | high current and voltage |
| Answer» D. high current and voltage | |
| 1382. |
The abbreviation of 'MCB' is for |
| A. | moving circuit breaker |
| B. | manual current breaker |
| C. | manual circuit breaker |
| D. | miniature circuit breaker |
| Answer» E. | |
| 1383. |
"Electrons" have |
| A. | positive charge |
| B. | negative charge |
| C. | no charge |
| D. | double charge |
| Answer» C. no charge | |
| 1384. |
Current is measured in |
| A. | Volts (V) |
| B. | Galvez (G) |
| C. | Bars (B) |
| D. | Amperes (A) |
| Answer» E. | |
| 1385. |
'Copper' has |
| A. | low current |
| B. | low voltage |
| C. | low resistance |
| D. | low energy |
| Answer» D. low energy | |
| 1386. |
The resistance also depends upon the |
| A. | length of wire |
| B. | width of wire |
| C. | surface area |
| D. | depth of object |
| Answer» B. width of wire | |
| 1387. |
The appliances that are used at homes, are usually termed as |
| A. | home appliances |
| B. | home products |
| C. | both a and b |
| D. | home items |
| Answer» D. home items | |
| 1388. |
An iron bar linked to a small hammer is attracted by the |
| A. | electromagnet |
| B. | magnet |
| C. | coil |
| D. | gong |
| Answer» B. magnet | |
| 1389. |
When a large current passes through a fuse, it |
| A. | melts the wire in the fuse |
| B. | glows up the wire in the fuse |
| C. | sparks the wire and breaks the circuit |
| D. | it simply spark the wire |
| Answer» B. glows up the wire in the fuse | |
| 1390. |
The process used in electroplating is called |
| A. | electrodeposition |
| B. | cathoding |
| C. | anoding |
| D. | electrorides |
| Answer» C. anoding | |
| 1391. |
When electrons vibrate fast, some of the electrical energy is changed to |
| A. | light energy |
| B. | thermal energy |
| C. | kinetic energy |
| D. | potential energy |
| Answer» C. kinetic energy | |
| 1392. |
In electric motors, a coil or a wire carrying an electric current produces |
| A. | electronic field |
| B. | resistance |
| C. | magnetic field |
| D. | electronic charge |
| Answer» D. electronic charge | |
| 1393. |
For each electric appliance, the fuse should be fixed with |
| A. | normal reading |
| B. | estimated reading |
| C. | accurate reading |
| D. | approximate reading |
| Answer» D. approximate reading | |
| 1394. |
The consumed number of units of electricity can be found by applying formula |
| A. | Power/distance |
| B. | Power/time |
| C. | Distance x Time |
| D. | Power x Time |
| Answer» E. | |
| 1395. |
Ultrasound is used instead of x-rays because x-rays can |
| A. | damage body cells |
| B. | damage the body |
| C. | damage the vessels |
| D. | stimulate the growth of cancer cells |
| Answer» B. damage the body | |
| 1396. |
The height of a wave is known as |
| A. | amplitude |
| B. | wave front |
| C. | volume |
| D. | space of sound |
| Answer» B. wave front | |
| 1397. |
To shape a metal |
| A. | ultrasound can be useful |
| B. | gamma-rays can be useful |
| C. | x-rays can be useful |
| D. | infrasound can be useful |
| Answer» B. gamma-rays can be useful | |
| 1398. |
An example of wind instrument is |
| A. | drum |
| B. | flute |
| C. | piano |
| D. | violin |
| Answer» C. piano | |
| 1399. |
If a tuning fork makes a single musical note, it will produce |
| A. | a wave |
| B. | a frequency |
| C. | a wave front |
| D. | an amplitude |
| Answer» B. a frequency | |
| 1400. |
When all the hydrogen gas used up, the sun would start to |
| A. | cool down |
| B. | shrink |
| C. | grow bigger |
| D. | melt |
| Answer» D. melt | |