MCQOPTIONS
Saved Bookmarks
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.
| 451. |
The most common use of 'radioactivity' is |
| A. | generation of electricity |
| B. | production of medicine |
| C. | in agriculture |
| D. | in industries |
| Answer» B. production of medicine | |
| 452. |
True statement about strength of bonding is |
| A. | ionic bonding is weaker than covalent bonding |
| B. | covalent bonding is stronger than ionic bonding |
| C. | ionic bonding is weaker than dative bonding |
| D. | covalent bonding is weaker than ionic bonding |
| Answer» E. | |
| 453. |
In medical the most common use of nuclear battery is in |
| A. | hybrid machine |
| B. | heart machine |
| C. | pace maker |
| D. | ultrasound machine |
| Answer» D. ultrasound machine | |
| 454. |
At night the group of stars which appears in the sky, is called |
| A. | horoscope |
| B. | constellation |
| C. | prominence |
| D. | ptolemy |
| Answer» C. prominence | |
| 455. |
If we launch a rocket at the speed of light to reach Sirius it will take |
| A. | 9 years |
| B. | 6 years |
| C. | 120 years |
| D. | 12 years |
| Answer» B. 6 years | |
| 456. |
In formation of solar system phenomena after explosion, the great bulge started to turn into |
| A. | another disc |
| B. | galaxy |
| C. | sun |
| D. | planet |
| Answer» D. planet | |
| 457. |
When you look up into the sky, you are looking out into |
| A. | atmosphere |
| B. | space |
| C. | galaxies |
| D. | stars |
| Answer» C. galaxies | |
| 458. |
When energy of a star begins to run out, the star starts to |
| A. | shrink |
| B. | cool down |
| C. | heat up |
| D. | enlarge |
| Answer» E. | |
| 459. |
There are two types of flowers in a plant namely |
| A. | unisexual and tri-sexual flowers |
| B. | unisexual and bi-sexual flowers |
| C. | bisexual and tri-sexual flowers |
| D. | unisexual and homosexual flowers |
| Answer» C. bisexual and tri-sexual flowers | |
| 460. |
As the embryo grows, ovule turns into a |
| A. | fruit |
| B. | flower |
| C. | seed |
| D. | ovary |
| Answer» D. ovary | |
| 461. |
The male reproductive part of a flower contains two round shaped structures at their tip. These structures are known as |
| A. | anthers |
| B. | filaments |
| C. | stamens |
| D. | carpels |
| Answer» B. filaments | |
| 462. |
The transfer of pollen grains from anther to stigma of the same flower, or to the stigma of another flower on the same plant is known as |
| A. | self reproduction |
| B. | cross reproduction |
| C. | self pollination |
| D. | cross pollination |
| Answer» D. cross pollination | |
| 463. |
Flowers pollinated by means of insects, have |
| A. | bright colored petals and attractive scent |
| B. | dull colored petals and attractive scent |
| C. | bright colored petals and bad smell |
| D. | dull colored petals and bad smell |
| Answer» B. dull colored petals and attractive scent | |
| 464. |
The light in 'optical fiber' is |
| A. | refracted |
| B. | reflected |
| C. | straightened |
| D. | reflected totally internally |
| Answer» E. | |
| 465. |
More dense the object |
| A. | less the light refracts |
| B. | less the light reflects |
| C. | more the light refracts |
| D. | more the light reflects |
| Answer» D. more the light reflects | |
| 466. |
Each pair of objects is identified by |
| A. | refractive index |
| B. | nature |
| C. | type |
| D. | shape |
| Answer» B. nature | |
| 467. |
Light travels more quickly in |
| A. | metals |
| B. | warm air |
| C. | cool air |
| D. | metalloids |
| Answer» C. cool air | |
| 468. |
The lenses used for short sighted are |
| A. | convex |
| B. | biconvex |
| C. | concave |
| D. | flat lenses |
| Answer» D. flat lenses | |
| 469. |
The respiration that does not involve the presence of oxygen is known as |
| A. | aerobic respiration |
| B. | anaerobic respiration |
| C. | passive Respiration |
| D. | active respiration |
| Answer» C. passive Respiration | |
| 470. |
The 'air' is made warm by |
| A. | hair in nostrils |
| B. | blood capillaries in nostrils |
| C. | water in the nose |
| D. | mucus in the nostrils |
| Answer» C. water in the nose | |
| 471. |
The main cause of 'asthma' is |
| A. | tobacco smoke |
| B. | pets |
| C. | exercise |
| D. | laughing |
| Answer» B. pets | |
| 472. |
Hair in nostrils help to |
| A. | inhale easily |
| B. | exhale easily |
| C. | clean air from dust |
| D. | make the air warm |
| Answer» D. make the air warm | |
| 473. |
Flu is caused by |
| A. | bacteria |
| B. | viruses |
| C. | insects |
| D. | dust |
| Answer» C. insects | |
| 474. |
The color of a star gives us idea about its |
| A. | inner core |
| B. | outer core temperature |
| C. | mantle temperature |
| D. | surface temperature |
| Answer» E. | |
| 475. |
Just like sun, a process that produces a lot of energy takes place on other stars. This process is known as |
| A. | nuclear fusion |
| B. | nuclear fission |
| C. | atomic explosions |
| D. | hydrogen explosions |
| Answer» B. nuclear fission | |
| 476. |
First, stars were formed in clumps like a large cluster of |
| A. | planets |
| B. | stars |
| C. | small galaxies |
| D. | small stars |
| Answer» D. small stars | |
| 477. |
The sun, earth and all other stars in the galaxy race around its |
| A. | center |
| B. | borders |
| C. | shape |
| D. | orbits |
| Answer» B. borders | |
| 478. |
The dishes of a separate aerial telescope are arranged in the shape of a letter i.e. |
| A. | A |
| B. | X |
| C. | Y |
| D. | Z |
| Answer» D. Z | |
| 479. |
Most of the mineral salts in soil enter the roots by the process of |
| A. | diffusion |
| B. | osmosis |
| C. | active transport |
| D. | respiration |
| Answer» D. respiration | |
| 480. |
Carbon dioxide and oxygen move in the plants by |
| A. | xylem |
| B. | phloem |
| C. | diffusion |
| D. | active transport |
| Answer» D. active transport | |
| 481. |
In roots, vascular bundles are |
| A. | at left |
| B. | at right |
| C. | in center |
| D. | at the top |
| Answer» D. at the top | |
| 482. |
Water evaporates from tiny pores on the lower part of leaf. These pores are known as |
| A. | cuticles |
| B. | lenticels |
| C. | epidermis |
| D. | stomata |
| Answer» E. | |
| 483. |
'Phloem' is a vessel in the plants which carries |
| A. | food and minerals to leaves from roots |
| B. | food and minerals to roots from leaves |
| C. | prepared food to other parts from roots |
| D. | prepared food to other parts from leaves |
| Answer» E. | |
| 484. |
The speed of light in soda-lime glass is |
| A. | 100,000 km/s |
| B. | 150,000 km/s |
| C. | 200,000 km/s |
| D. | 250,000 km/s |
| Answer» D. 250,000 km/s | |
| 485. |
The objects that do not produce their own light are known as |
| A. | luminous objects |
| B. | non luminous objects |
| C. | opaque objects |
| D. | translucent objects |
| Answer» C. opaque objects | |
| 486. |
The waves at the bottom of spectrum are |
| A. | infrared waves |
| B. | gamma-rays |
| C. | x-rays |
| D. | ultraviolet rays |
| Answer» E. | |
| 487. |
'Prisms' with total internal reflection are used in |
| A. | telescopes |
| B. | glasses |
| C. | mirrors |
| D. | side mirrors of cars |
| Answer» B. glasses | |
| 488. |
The gravitational force which acts on a body, is called |
| A. | mass |
| B. | weight |
| C. | size |
| D. | load |
| Answer» C. size | |
| 489. |
Forces can easily change the |
| A. | direction of an object |
| B. | gravity of an object |
| C. | density of an object |
| D. | volume of an object |
| Answer» B. gravity of an object | |
| 490. |
Force can make a stationary object to |
| A. | move |
| B. | rotate |
| C. | spin |
| D. | still |
| Answer» B. rotate | |
| 491. |
Force can be measured by the help of |
| A. | foci meter |
| B. | spring balance |
| C. | pane balance |
| D. | both a and b |
| Answer» E. | |
| 492. |
A force which opposes motion is known as |
| A. | friction |
| B. | gravity |
| C. | pull |
| D. | push |
| Answer» B. gravity | |
| 493. |
The particles that have opposite charges, are |
| A. | protons and electrons |
| B. | protons and neutrons |
| C. | neutrons and electrons |
| D. | photons and protons |
| Answer» B. protons and neutrons | |
| 494. |
Atoms of an element with same atomic number but having different mass number are known as |
| A. | allotropes |
| B. | isotopes |
| C. | hydrocarbons |
| D. | amotopes |
| Answer» C. hydrocarbons | |
| 495. |
The atomic number of lithium is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 496. |
Nucleus consists of |
| A. | protons only |
| B. | electron only |
| C. | neutrons only |
| D. | protons and neutrons |
| Answer» E. | |
| 497. |
Atoms of similar elements have same |
| A. | nucleon number |
| B. | mass number |
| C. | nuclear number |
| D. | atomic number |
| Answer» E. | |
| 498. |
The cool air which comes from sea to land is known as |
| A. | sea breeze |
| B. | land breeze |
| C. | forward breeze |
| D. | reverse breeze |
| Answer» B. land breeze | |
| 499. |
The color and texture of poor absorber of radiant heat is |
| A. | black and shiny |
| B. | black and dull |
| C. | white and shiny |
| D. | white and dull |
| Answer» D. white and dull | |
| 500. |
The objects that are cooler than other objects gain heat from |
| A. | sun |
| B. | surroundings |
| C. | stove |
| D. | smoke releasing fuels |
| Answer» B. surroundings | |