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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.
| 1801. |
The change which is not accompanied by formation of new substance is called a |
| A. | physical change |
| B. | chemical change |
| C. | complex change |
| D. | electrical change |
| Answer» B. chemical change | |
| 1802. |
Chemical change involves the formation of |
| A. | products |
| B. | new substances |
| C. | salts |
| D. | water |
| Answer» C. salts | |
| 1803. |
Melting, freezing, boiling, evaporation and condensation are all |
| A. | physical change |
| B. | chemical change |
| C. | complex change |
| D. | electrical change |
| Answer» B. chemical change | |
| 1804. |
If both water and carbon dioxide is given to plant it will not be able to prepare its own food in absence of |
| A. | sugar |
| B. | soil |
| C. | sunlight |
| D. | fertilizers |
| Answer» D. fertilizers | |
| 1805. |
At room temperature iron and sulphur |
| A. | do no react |
| B. | react |
| C. | vigorously react |
| D. | somehow react |
| Answer» B. react | |
| 1806. |
Bats use ultrasound to find its |
| A. | home |
| B. | predator |
| C. | prey |
| D. | baby |
| Answer» D. baby | |
| 1807. |
In air, the speed of sound is |
| A. | 3000 m/s |
| B. | 300 m/s |
| C. | 3300 m/s |
| D. | 330 m/s |
| Answer» E. | |
| 1808. |
Some whales produce songs that travel for about |
| A. | 1 kilometer |
| B. | 2 kilometers |
| C. | 50 kilometers |
| D. | 100 kilometers |
| Answer» E. | |
| 1809. |
Unwanted or unpleasant sounds are known as |
| A. | music |
| B. | noise |
| C. | laugh |
| D. | yawn |
| Answer» C. laugh | |
| 1810. |
The louder the sound, the more |
| A. | the wave front |
| B. | the wavelength |
| C. | the energy |
| D. | the frequency |
| Answer» D. the frequency | |
| 1811. |
The transfer of heat in solids from higher concentration to lower concentration in the presence of medium is known as |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | excursion |
| Answer» B. convection | |
| 1812. |
If we put a metal spoon in hot soup, the handle would get |
| A. | cool |
| B. | hot |
| C. | rusted |
| D. | stuck |
| Answer» C. rusted | |
| 1813. |
Mostly people wear black or dark colored clothes in winter, because dark colors |
| A. | absorb more heat |
| B. | absorb less heat |
| C. | reflect more heat |
| D. | transfer less heat |
| Answer» B. absorb less heat | |
| 1814. |
Atmosphere of earth acts similarly as |
| A. | light bulb |
| B. | LED bulb |
| C. | pressure cooker |
| D. | greenhouse |
| Answer» E. | |
| 1815. |
In winter, closed curtains help in keeping a house warm by |
| A. | preventing heat to enter |
| B. | preventing light to enter |
| C. | preventing greenhouse effect |
| D. | trapping air |
| Answer» E. | |
| 1816. |
A silver pendant is made up of atoms of |
| A. | silver |
| B. | gold |
| C. | platinum |
| D. | metals |
| Answer» B. gold | |
| 1817. |
An atom is itself an entity and by charge it is |
| A. | neutral |
| B. | positive |
| C. | negative |
| D. | retrograde |
| Answer» B. positive | |
| 1818. |
Each 'ozone' molecule is made up of three |
| A. | oxygen atoms |
| B. | phosphors atoms |
| C. | carbon dioxide atoms |
| D. | nitrogen atoms |
| Answer» B. phosphors atoms | |
| 1819. |
Neutrons carry |
| A. | positive charge |
| B. | negative charge |
| C. | neutral charge |
| D. | no charge |
| Answer» E. | |
| 1820. |
Many helium atoms join together to form |
| A. | ammonia gas |
| B. | helium gas |
| C. | oxygen gas |
| D. | neon gas |
| Answer» C. oxygen gas | |
| 1821. |
If more than one drug is used to treat specific illness, they can be mixed in |
| A. | common solvent |
| B. | different solvents |
| C. | oral dose |
| D. | one of above |
| Answer» B. different solvents | |
| 1822. |
An important factor on which solubility depends, is the nature of |
| A. | solvent |
| B. | surface area |
| C. | conditions |
| D. | apparatus |
| Answer» B. surface area | |
| 1823. |
Plants absorb mineral salt and fertilizers which are dissolved in |
| A. | air |
| B. | soil |
| C. | water |
| D. | leaves |
| Answer» D. leaves | |
| 1824. |
The antacids that are used for treating indigestion contain |
| A. | potassium hydroxide |
| B. | sodium hydroxide |
| C. | magnesium carbonate |
| D. | magnesium hydroxide |
| Answer» E. | |
| 1825. |
The dyes of 'litmus' are made from |
| A. | rhizoids |
| B. | lichens |
| C. | mycorrhizae |
| D. | algae |
| Answer» C. mycorrhizae | |
| 1826. |
When substance combines with oxygen while burning, the reaction is termed as |
| A. | combustion |
| B. | burning |
| C. | evaporation |
| D. | both a and b |
| Answer» D. both a and b | |
| 1827. |
If two or more substances are combined to form a new substance, the chemical reaction is termed as |
| A. | thermal decomposition |
| B. | combination |
| C. | addition |
| D. | combustion |
| Answer» C. addition | |
| 1828. |
The process in which reactants react together to form a product, is called |
| A. | chemical reaction |
| B. | chemical change |
| C. | chemical process |
| D. | chemical procedure |
| Answer» B. chemical change | |
| 1829. |
Fuel obtained from fossils is known as |
| A. | decayed animal's oil |
| B. | decayed plant's extract |
| C. | fossils fuel |
| D. | crude oil |
| Answer» D. crude oil | |
| 1830. |
Dilute acids and alkalis react together to form |
| A. | salt |
| B. | water |
| C. | gases |
| D. | both a and b |
| Answer» E. | |
| 1831. |
A hand bell stimulates the |
| A. | movement of air particles |
| B. | collision of air particles |
| C. | vibration of air particles |
| D. | energy of air particles |
| Answer» D. energy of air particles | |
| 1832. |
Sound travels fastest in |
| A. | gases |
| B. | liquids |
| C. | solids |
| D. | space |
| Answer» D. space | |
| 1833. |
The highest level of frequency which human ear can detect is |
| A. | 2 Hz |
| B. | 20 Hz |
| C. | 20kHz |
| D. | 2kHz |
| Answer» D. 2kHz | |
| 1834. |
When sound travels, the air molecules vibrate |
| A. | parallel to the sound direction |
| B. | perpendicular to the sound direction |
| C. | opposite to the sound direction |
| D. | in the direction of the sound |
| Answer» E. | |
| 1835. |
'Dolphins' can capture their prey using |
| A. | echo |
| B. | infrasound |
| C. | eye sight |
| D. | ears and sensors |
| Answer» B. infrasound | |
| 1836. |
At night, warm air rises over |
| A. | land |
| B. | sea |
| C. | trees |
| D. | ground |
| Answer» C. trees | |
| 1837. |
Soil and plants emit |
| A. | low ultraviolet rays |
| B. | high ultraviolet rays |
| C. | low infrared waves |
| D. | high infrared waves |
| Answer» D. high infrared waves | |
| 1838. |
All substance are made up of particles that are constantly |
| A. | moving |
| B. | vibrating |
| C. | absorbing |
| D. | releasing |
| Answer» B. vibrating | |
| 1839. |
Nowadays, instead of glass, manufacturers are using |
| A. | double sided metal |
| B. | single sided metal |
| C. | shiny metal |
| D. | dull metal |
| Answer» B. single sided metal | |
| 1840. |
White painted roof and walls prevent |
| A. | excess heat loss |
| B. | excess heat absorption |
| C. | excess heat loss and absorption |
| D. | excess heat transfer |
| Answer» D. excess heat transfer | |
| 1841. |
The more dense the liquid, the |
| A. | more slow the speed of sound |
| B. | more fast the speed of sound |
| C. | more distance covered by the sound |
| D. | less distance covered by the sound |
| Answer» C. more distance covered by the sound | |
| 1842. |
The loudness of sound is also known as |
| A. | amplitude |
| B. | wave front |
| C. | volume |
| D. | pace of sound |
| Answer» D. pace of sound | |
| 1843. |
Sound is a form of |
| A. | force |
| B. | power |
| C. | light |
| D. | energy |
| Answer» E. | |
| 1844. |
Trombone is also an example of |
| A. | wind instrument |
| B. | string instrument |
| C. | soprano instrument |
| D. | brass instrument |
| Answer» E. | |
| 1845. |
Sound is made louder by increasing |
| A. | wavelength |
| B. | frequency |
| C. | wave front |
| D. | amplitude |
| Answer» E. | |
| 1846. |
The hypothesis that all matters are made up of tiny discrete particles and too small to be seen with a naked eye was given by |
| A. | Democritus |
| B. | Aristotle |
| C. | Robert brown |
| D. | Albert Einstein |
| Answer» B. Aristotle | |
| 1847. |
The haphazard movement of particles suspended in a liquid or gas due to the consequence of ongoing bombardment by molecules of a medium is |
| A. | Brownian motion |
| B. | Albert motion |
| C. | Aristotle motion |
| D. | Dalton motion |
| Answer» B. Albert motion | |
| 1848. |
When solid is heated its particles begin to vibrate fast by gaining |
| A. | energy |
| B. | volume |
| C. | mass |
| D. | force |
| Answer» B. volume | |
| 1849. |
The particles of the solid |
| A. | spin |
| B. | vibrate |
| C. | move along |
| D. | both a and b |
| Answer» E. | |
| 1850. |
To explain and understand natural phenomenon, there is given a |
| A. | theory |
| B. | formula |
| C. | model |
| D. | structure |
| Answer» D. structure | |