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.
| 1751. |
Each collision of Uranium-238 with neutrons releases |
| A. | energy |
| B. | radiations |
| C. | light |
| D. | waves |
| Answer» B. radiations | |
| 1752. |
In radioactive decay, some isotopes release a small amount of energy which can be used to |
| A. | fire up wood |
| B. | generate electric current |
| C. | light up a bulb |
| D. | light up a whole town |
| Answer» C. light up a bulb | |
| 1753. |
Isotopes behave in different way in |
| A. | chemical reactions |
| B. | bonding |
| C. | electrical conductivity |
| D. | all of above |
| Answer» E. | |
| 1754. |
Electrons are mainly |
| A. | solids |
| B. | bundle of light |
| C. | bundle of energy |
| D. | gases |
| Answer» D. gases | |
| 1755. |
The number of protons and electrons in an atom of uranium is |
| A. | 90 |
| B. | 91 |
| C. | 92 |
| D. | 94 |
| Answer» D. 94 | |
| 1756. |
Iron is represented by |
| A. | C |
| B. | Fe |
| C. | I |
| D. | Ir |
| Answer» C. I | |
| 1757. |
As the unstable atoms break up into smaller atoms, |
| A. | energy is released |
| B. | radiations are released |
| C. | light is released |
| D. | heat is released |
| Answer» C. light is released | |
| 1758. |
The second shell with the second energy level is known as |
| A. | shell B |
| B. | shell L |
| C. | shell P |
| D. | shell K |
| Answer» D. shell K | |
| 1759. |
Hydrogen is a diatomic gas and its chemical formula is |
| A. | H2 |
| B. | H2 |
| C. | H |
| D. | Hy |
| Answer» C. H | |
| 1760. |
The electronic configuration of sodium as K, L, M is |
| A. | 2, 1, 8 |
| B. | 8, 1, 2 |
| C. | 1, 2, 8 |
| D. | 2, 8, 1 |
| Answer» E. | |
| 1761. |
Second shell can hold up to |
| A. | four electrons |
| B. | six electrons |
| C. | eight electrons |
| D. | twelve electrons |
| Answer» D. twelve electrons | |
| 1762. |
The 'chlorine' ion has |
| A. | positive charge |
| B. | negative charge |
| C. | no charge |
| D. | both a and b |
| Answer» C. no charge | |
| 1763. |
The atomic number of 'neon' is |
| A. | 8 |
| B. | 10 |
| C. | 12 |
| D. | 14 |
| Answer» C. 12 | |
| 1764. |
Unstable atoms are radioactive so we call them |
| A. | radioisotopes |
| B. | radioactive |
| C. | radio atoms |
| D. | radio allotropes |
| Answer» B. radioactive | |
| 1765. |
Mass number tells us the number of |
| A. | neutrons only |
| B. | electrons only |
| C. | particles in the nucleus |
| D. | protons only |
| Answer» D. protons only | |
| 1766. |
The symbol of 'Carbon' is |
| A. | Bo |
| B. | C |
| C. | N |
| D. | Br |
| Answer» C. N | |
| 1767. |
The larger the number of subatomic particles, the more the likeliness of being |
| A. | stable |
| B. | radioactive |
| C. | complete |
| D. | decayed |
| Answer» C. complete | |
| 1768. |
The symbol of Nitrogen is |
| A. | Bo |
| B. | C |
| C. | N |
| D. | Br |
| Answer» D. Br | |
| 1769. |
Uranium-238 which is an isotope of uranium, is |
| A. | stable |
| B. | radioactive |
| C. | complete |
| D. | decayed |
| Answer» C. complete | |
| 1770. |
If no loss or gain of electrons occur by mixing of two atoms, we say that they may be attached to each other due to |
| A. | proton attraction |
| B. | neutron attraction |
| C. | sharing of electrons |
| D. | opposite charges |
| Answer» D. opposite charges | |
| 1771. |
The first electromagnetic generator "Faraday disk" was built in |
| A. | 1381 |
| B. | 1831 |
| C. | 1813 |
| D. | 1183 |
| Answer» E. | |
| 1772. |
The world's most famous telescope is |
| A. | Spitzer Space Telescope |
| B. | Fermi Gamma-Ray Space Telescope |
| C. | Arecibo Telescope |
| D. | Hubble Telescope |
| Answer» E. | |
| 1773. |
A dish is faced towards sky to focus and collect |
| A. | energy |
| B. | waves |
| C. | power |
| D. | current |
| Answer» C. power | |
| 1774. |
The average distance between each star is about |
| A. | 2 light years |
| B. | 3 light years |
| C. | 4 light years |
| D. | 5 light years |
| Answer» E. | |
| 1775. |
By Sirius B, Sirius A is orbited every |
| A. | 30 years |
| B. | 40 years |
| C. | 50 years |
| D. | 60 years |
| Answer» D. 60 years | |
| 1776. |
A black hole is more dense than a |
| A. | white dwarf |
| B. | neutron star |
| C. | yellow star |
| D. | red supergiant |
| Answer» C. yellow star | |
| 1777. |
Cones are also sensitive to |
| A. | secondary colors |
| B. | tertiary colors |
| C. | mixed colors |
| D. | primary colors |
| Answer» E. | |
| 1778. |
Light travels fastest through |
| A. | vacuum |
| B. | air |
| C. | solids |
| D. | liquids |
| Answer» B. air | |
| 1779. |
The disk spun on rainbow to join its seven colors in order to make the effect of white light is known as |
| A. | Rainbow disk |
| B. | Newton disk |
| C. | Newton's color disk |
| D. | Rainbow color disk |
| Answer» D. Rainbow color disk | |
| 1780. |
An example of a device in which convex lens is used, is |
| A. | mirror |
| B. | telescope |
| C. | spectacles |
| D. | contact lenses |
| Answer» C. spectacles | |
| 1781. |
If an object is extremely dense, light |
| A. | passes through it |
| B. | never passes through it |
| C. | leaves it at once |
| D. | never leaves it |
| Answer» E. | |
| 1782. |
A human body removes most of the water through |
| A. | urination |
| B. | breathing |
| C. | sweating |
| D. | working hard |
| Answer» B. breathing | |
| 1783. |
Due to the contraction of bronchi it is difficult to |
| A. | inhale |
| B. | exhale |
| C. | breathe |
| D. | cough |
| Answer» B. exhale | |
| 1784. |
The common treatment for 'asthma' is |
| A. | injection |
| B. | inhaler |
| C. | nebulization |
| D. | surgery |
| Answer» C. nebulization | |
| 1785. |
When we exhale |
| A. | the diaphragm is pushed up and the rib cage is pushed downwards |
| B. | the diaphragm is pulled down and the rib cage is pushed downwards |
| C. | the diaphragm is pulled down and the rib cage is pulled upwards |
| D. | the diaphragm is pushed upwards and the rib cage is pulled upwards |
| Answer» B. the diaphragm is pulled down and the rib cage is pushed downwards | |
| 1786. |
The negative and positive regions of a battery are known as |
| A. | ridges |
| B. | chargers |
| C. | terminals |
| D. | electrodes |
| Answer» D. electrodes | |
| 1787. |
Maglev trains don't |
| A. | ride on the track |
| B. | fall from the track |
| C. | repel from the track |
| D. | stay on the track |
| Answer» B. fall from the track | |
| 1788. |
The wire coil acts as an |
| A. | electric wire |
| B. | electric plate |
| C. | electromagnet |
| D. | conductor |
| Answer» D. conductor | |
| 1789. |
Power is measured in |
| A. | Joules (J) |
| B. | Pascal's (Pa) |
| C. | Watts (W) |
| D. | Ohms (Omega) |
| Answer» D. Ohms (Omega) | |
| 1790. |
'ELCB'is an |
| A. | electronic switch |
| B. | electromagnetic switch |
| C. | electric appliance |
| D. | electric bulb |
| Answer» C. electric appliance | |
| 1791. |
The dark spots on the surface of sun are known as |
| A. | dark spots |
| B. | sunspots |
| C. | low spots |
| D. | cool spots |
| Answer» C. low spots | |
| 1792. |
If we observe space for the whole year, we would see different stars every |
| A. | year |
| B. | month |
| C. | season |
| D. | week |
| Answer» D. week | |
| 1793. |
Milky way galaxy has most of its stars |
| A. | on its boundary line |
| B. | in the center |
| C. | at the corners |
| D. | behind its boundary line |
| Answer» C. at the corners | |
| 1794. |
The name of our galaxy is |
| A. | Whirlpool galaxy |
| B. | Black eye galaxy |
| C. | Andromeda galaxy |
| D. | Milky Way galaxy |
| Answer» E. | |
| 1795. |
The spiral shaped system is known as |
| A. | solar system |
| B. | galaxy |
| C. | cluster |
| D. | comet |
| Answer» C. cluster | |
| 1796. |
The largest ocean covers about |
| A. | half of the surface of earth |
| B. | quarter of the surface of earth |
| C. | one-third of the surface of earth |
| D. | one-fifth of the surface of earth |
| Answer» D. one-fifth of the surface of earth | |
| 1797. |
If we don't drink water, we will eventually |
| A. | get dry |
| B. | get wet |
| C. | die |
| D. | get hydrated |
| Answer» D. get hydrated | |
| 1798. |
Crops grow well when they are |
| A. | fertilized |
| B. | irrigated |
| C. | cared |
| D. | wilted |
| Answer» C. cared | |
| 1799. |
The soil and sand is settled at the bottom in |
| A. | metal screen |
| B. | grit tank |
| C. | sludge tank |
| D. | filter bed |
| Answer» C. sludge tank | |
| 1800. |
The disease formed due to the drinking of water containing bacteria and viruses is known as |
| A. | water-borne diseases |
| B. | water-washed diseases |
| C. | water-related diseases |
| D. | anti-water diseases |
| Answer» B. water-washed diseases | |