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.
| 201. |
The Earth's atmosphere acts as a filter to remove |
| A. | radiation |
| B. | gamma rays |
| C. | x-rays |
| D. | beta-rays |
| Answer» C. x-rays | |
| 202. |
A black hole may pull matter in from a nearby |
| A. | galaxy |
| B. | cluster |
| C. | comet |
| D. | star |
| Answer» E. | |
| 203. |
To complete one rotation, sun takes approximately |
| A. | two days |
| B. | three days |
| C. | four days |
| D. | five days |
| Answer» E. | |
| 204. |
The whole universe was packed into a small mass about |
| A. | 15,000 years ago |
| B. | 15 million years ago |
| C. | 15 billion years ago |
| D. | 15 trillion years ago |
| Answer» D. 15 trillion years ago | |
| 205. |
An alcohol which is produced from sugarcane, corn and other plants by fermentation is called |
| A. | ethanol |
| B. | methanol |
| C. | propanol |
| D. | glycol |
| Answer» B. methanol | |
| 206. |
The heat obtained from solar furnace is used to drive |
| A. | turbines |
| B. | electricity generators |
| C. | vehicles |
| D. | both a and b |
| Answer» E. | |
| 207. |
Coal, crude, petroleum and natural gas are examples of |
| A. | elements |
| B. | man made fuels |
| C. | fossils fuel |
| D. | compounds |
| Answer» D. compounds | |
| 208. |
Plankton (marine micro-organism), buried under heat and pressure for a long period, turned in to |
| A. | crude oil |
| B. | natural gas |
| C. | coal |
| D. | kerosene |
| Answer» B. natural gas | |
| 209. |
Although solar energy is safe, free of pollution and freely available but it is difficult to |
| A. | harness |
| B. | conserve |
| C. | store |
| D. | transfer |
| Answer» B. conserve | |
| 210. |
The energy at each trophic level is transformed to the next level is only |
| A. | 0.005 |
| B. | 0.001 |
| C. | 0.011 |
| D. | 0.1 |
| Answer» E. | |
| 211. |
Deciduous trees are the trees that shed |
| A. | excess water |
| B. | stems |
| C. | roots |
| D. | leaves |
| Answer» E. | |
| 212. |
Bears have sharp teeth to kill |
| A. | birds |
| B. | penguins |
| C. | walrus |
| D. | seals |
| Answer» E. | |
| 213. |
Underneath hair of polar bear, the color of his skin is |
| A. | pink |
| B. | black |
| C. | brown |
| D. | white |
| Answer» C. brown | |
| 214. |
The tail of fish is important to control its |
| A. | movement |
| B. | direction |
| C. | speed |
| D. | sight |
| Answer» C. speed | |
| 215. |
We can hear the voice of alarm clock when there is |
| A. | vacuum in the jar |
| B. | air in the jar |
| C. | liquid in the jar |
| D. | space in the jar |
| Answer» C. liquid in the jar | |
| 216. |
The lowest level of frequency a human ear can detect, is |
| A. | 2 Hz |
| B. | 20 Hz |
| C. | 20kHz |
| D. | 2kHz |
| Answer» C. 20kHz | |
| 217. |
The pleasant sound of music depends on its |
| A. | amplitude |
| B. | frequency |
| C. | wavelength |
| D. | volume |
| Answer» C. wavelength | |
| 218. |
The parts of sound waves where air pressure is lesser, is known as |
| A. | compression |
| B. | rarefaction |
| C. | consolation |
| D. | expansion |
| Answer» C. consolation | |
| 219. |
Who discovered the 'Korotkoff' sounds? |
| A. | Isaac Newton |
| B. | Dr.Nikolai Korotkoff |
| C. | Michael Faraday |
| D. | Thomas Silva Edison |
| Answer» C. Michael Faraday | |
| 220. |
Neutrons in an atom also affect the |
| A. | chemical properties |
| B. | physical properties |
| C. | bonding properties |
| D. | thermal properties |
| Answer» C. bonding properties | |
| 221. |
Valency of sodium is |
| A. | 1 |
| B. | 4 |
| C. | 3 |
| D. | 2 |
| Answer» B. 4 | |
| 222. |
Ionic bonds are |
| A. | easy to break |
| B. | weak |
| C. | electrical bonds |
| D. | very difficult to break |
| Answer» E. | |
| 223. |
As compare to ionic compounds, covalent bond has |
| A. | high melting but low boiling point |
| B. | low melting but high boiling point |
| C. | low melting and boiling point |
| D. | high melting and boiling point |
| Answer» D. high melting and boiling point | |
| 224. |
Electrons have |
| A. | negative charge |
| B. | positive charge |
| C. | no charge |
| D. | both charges |
| Answer» B. positive charge | |
| 225. |
The number and types of atoms a molecule contain, are shown by its |
| A. | chemical formula |
| B. | molecular formula |
| C. | structural formula |
| D. | atomic formula |
| Answer» B. molecular formula | |
| 226. |
An electrically charged particle which is formed when an atom gains or loses electron is called |
| A. | ion |
| B. | charge |
| C. | formula |
| D. | neutron |
| Answer» B. charge | |
| 227. |
Two or more atoms chemically combined together form a |
| A. | atom |
| B. | molecule |
| C. | nucleus |
| D. | atomic number |
| Answer» C. nucleus | |
| 228. |
A theory of movement of electrons in a fixed orbit around nucleus was given by |
| A. | Thomson's Model |
| B. | Rutherford's Model |
| C. | Dalton's Model |
| D. | Bohr Model |
| Answer» E. | |
| 229. |
In nucleus, mass of an atom is more than |
| A. | 0.9994 |
| B. | 0.9499 |
| C. | 0.9949 |
| D. | 0.4999 |
| Answer» B. 0.9499 | |
| 230. |
The first discovered 'white dwarf' is |
| A. | Procyon B |
| B. | Wolf 489 |
| C. | 40 Eridani B |
| D. | Sirius B |
| Answer» E. | |
| 231. |
The name of a star in circumpolar constellation is |
| A. | Sirius |
| B. | Andromeda |
| C. | Whirlpool |
| D. | Polaris |
| Answer» E. | |
| 232. |
The expansion of universe is slowing down due to |
| A. | heat |
| B. | comets |
| C. | light |
| D. | gravity |
| Answer» E. | |
| 233. |
The light we see coming from a star is only a small part of |
| A. | prominence |
| B. | nuclear fusions |
| C. | electromagnetic spectrum |
| D. | fraction |
| Answer» D. fraction | |
| 234. |
The surface of red supergiant shines |
| A. | brightly |
| B. | dimly |
| C. | normally |
| D. | colorfully |
| Answer» C. normally | |
| 235. |
In 1957, the first artificial satellite was built by soviets and its name was |
| A. | Hubble space |
| B. | Voyager-1 |
| C. | Sputnik-1 |
| D. | none of above |
| Answer» D. none of above | |
| 236. |
The seasons are caused due to rotation of |
| A. | earth |
| B. | sun |
| C. | moon |
| D. | galaxy |
| Answer» D. galaxy | |
| 237. |
The number of days in a leap year is |
| A. | 28 |
| B. | 29 |
| C. | 30 |
| D. | 31 |
| Answer» C. 30 | |
| 238. |
Asteroid belt is present between Mars and Jupiter. It is made up of |
| A. | gases |
| B. | stones |
| C. | rocks |
| D. | water |
| Answer» D. water | |
| 239. |
Lunar eclipse can be seen when there is |
| A. | half moon |
| B. | full moon |
| C. | crescent |
| D. | new moon |
| Answer» C. crescent | |
| 240. |
Musical instruments are so designed that they could produce |
| A. | musical notes |
| B. | pitch |
| C. | rhythm |
| D. | musical beat |
| Answer» B. pitch | |
| 241. |
When sound travels, it |
| A. | absorbs energy |
| B. | gains energy |
| C. | loses energy |
| D. | transfers energy |
| Answer» D. transfers energy | |
| 242. |
The part of sound wave where air pressure is greater, is known as |
| A. | compression |
| B. | rarefaction |
| C. | consolation |
| D. | expansion |
| Answer» B. rarefaction | |
| 243. |
Compared to drum, the vibration of a whistle is |
| A. | quite low |
| B. | high |
| C. | same |
| D. | of very high pitch |
| Answer» C. same | |
| 244. |
Sounds of birds and animals are |
| A. | artificial |
| B. | natural |
| C. | man made |
| D. | made electronically |
| Answer» C. man made | |
| 245. |
The spinning movement of earth is called |
| A. | revolution |
| B. | rotation |
| C. | spinning |
| D. | orbiting |
| Answer» C. spinning | |
| 246. |
Typical involving of supernatural beings or events are |
| A. | memories |
| B. | past |
| C. | myths |
| D. | present |
| Answer» D. present | |
| 247. |
The temperature at the center of sun is about |
| A. | 40,000 °C |
| B. | 50,000 °C |
| C. | 15 millions °C |
| D. | 150,000 °C |
| Answer» D. 150,000 °C | |
| 248. |
Every star radiates different combination of |
| A. | visible lights |
| B. | invisible lights |
| C. | visible and invisible lights |
| D. | sounds and waves |
| Answer» D. sounds and waves | |
| 249. |
"Ulysses" reached to the sun in |
| A. | 1991 |
| B. | 1992 |
| C. | 1993 |
| D. | 1994 |
| Answer» E. | |
| 250. |
Huge strainers are used to |
| A. | force water to the treatment plant |
| B. | increase the water pressure |
| C. | filter large particles in the water |
| D. | filter bacteria and other harmful organisms |
| Answer» D. filter bacteria and other harmful organisms | |