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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.
| 851. |
Compared to liquids, solids are |
| A. | incompressible |
| B. | compressible |
| C. | more compressible than liquids |
| D. | less compressible than liquids |
| Answer» B. compressible | |
| 852. |
Iron sulfide cannot be separated by magnet because iron and sulphur are now |
| A. | physically bonded |
| B. | chemically bonded |
| C. | biologically bonded |
| D. | organically bonded |
| Answer» C. biologically bonded | |
| 853. |
The texture of 'polythene' is |
| A. | hard and rough |
| B. | hard and smooth |
| C. | soft and rough |
| D. | soft and smooth |
| Answer» E. | |
| 854. |
Other than carbon and hydrogen, finished plastic may contain |
| A. | nitrogen and phosphorus |
| B. | nitrogen and oxygen |
| C. | sulphur and iron |
| D. | magnesium and nitrogen |
| Answer» C. sulphur and iron | |
| 855. |
One of the main components of fertilizers is |
| A. | ammonia |
| B. | chlorine |
| C. | hydrogen |
| D. | methane |
| Answer» B. chlorine | |
| 856. |
Plastic was accidently invented when the inventor was trying to make |
| A. | a cup for coffee |
| B. | an artificial ivory of billiard balls |
| C. | an artificial sword for martial arts training |
| D. | his favourite dish |
| Answer» C. an artificial sword for martial arts training | |
| 857. |
The particles of iron sulfide are |
| A. | physically bonded |
| B. | chemically bonded |
| C. | biologically bonded |
| D. | permanently bonded |
| Answer» C. biologically bonded | |
| 858. |
The mixture of iron and sulphur is separated by |
| A. | filtration |
| B. | magnet |
| C. | distillation |
| D. | evaporation |
| Answer» C. distillation | |
| 859. |
The definite 'volume' |
| A. | has solids only |
| B. | has liquids only |
| C. | has gases only |
| D. | has solids and liquids both |
| Answer» E. | |
| 860. |
The formula of ammonia is |
| A. | NH2 |
| B. | NH3 |
| C. | NH4 |
| D. | NH5 |
| Answer» C. NH4 | |
| 861. |
Chemical changes are also known as |
| A. | physical reactions |
| B. | chemical reactions |
| C. | biological reactions |
| D. | prominent reactions |
| Answer» C. biological reactions | |
| 862. |
After sometime the particles of solids start to move far apart, when |
| A. | kinetic energy is greater than thermal energy |
| B. | kinetic energy is greater than force of attraction |
| C. | potential energy is greater than kinetic energy |
| D. | potential energy is greater than thermal energy |
| Answer» C. potential energy is greater than kinetic energy | |
| 863. |
The color of 'nitrogen' gas is |
| A. | brown |
| B. | red |
| C. | green |
| D. | purple |
| Answer» B. red | |
| 864. |
The particles of gases are |
| A. | packed tightly |
| B. | packed closely |
| C. | small as compared to that of solids and liquids |
| D. | far apart |
| Answer» E. | |
| 865. |
As compared to low density polythene, the high density polythene can withstand |
| A. | high temperatures |
| B. | low pressures |
| C. | high pressures |
| D. | low temperatures |
| Answer» B. low pressures | |
| 866. |
Gases flow |
| A. | slower than solids |
| B. | slower than liquids |
| C. | faster than solids and liquids |
| D. | slower than solids and liquids |
| Answer» D. slower than solids and liquids | |
| 867. |
The filament bulb glows, when it reaches the temperature of |
| A. | 1000 °C |
| B. | 1100 °C |
| C. | 1200 °C |
| D. | 1300 °C |
| Answer» E. | |
| 868. |
'Electromagnet' can be made stronger by increasing |
| A. | the current in coil |
| B. | the voltage in coil |
| C. | the resistance of coil |
| D. | the thickness of coil |
| Answer» B. the voltage in coil | |
| 869. |
In most of the loudspeakers, electrical signals pass through a |
| A. | magnet |
| B. | wire coil |
| C. | spring |
| D. | resistor |
| Answer» C. spring | |
| 870. |
Small magnets are used in |
| A. | switches |
| B. | plugs |
| C. | electric bells |
| D. | fuses |
| Answer» D. fuses | |
| 871. |
One kilowatt is equal to |
| A. | 10 watts |
| B. | 100 watts |
| C. | 1000 watts |
| D. | 0.1 watts |
| Answer» D. 0.1 watts | |
| 872. |
Besides heat and light, electricity is also used in |
| A. | decaying |
| B. | vaporizing |
| C. | crushing |
| D. | decomposing |
| Answer» E. | |
| 873. |
'Electricity' can |
| A. | facilitate us |
| B. | make us lean |
| C. | make us fat |
| D. | relax us |
| Answer» B. make us lean | |
| 874. |
Metal ions move through the electrolyte to coat the object which is |
| A. | nematode |
| B. | posit rode |
| C. | anode |
| D. | cathode |
| Answer» E. | |
| 875. |
If we have two values, consumed electrical energy can be found. First, the period of use of appliance and second, the |
| A. | resistance of appliance |
| B. | length of wire of appliance |
| C. | power of the appliance |
| D. | mass of the appliance |
| Answer» D. mass of the appliance | |
| 876. |
Variable resistors can be used to |
| A. | dim the light |
| B. | change the color of light |
| C. | change the position of light |
| D. | change the properties of light |
| Answer» B. change the color of light | |
| 877. |
A 'loudspeaker' receives |
| A. | strong waves of sound |
| B. | strong resistance from source |
| C. | strong electrical signals |
| D. | strong voltage |
| Answer» D. strong voltage | |
| 878. |
The electrons flow from one terminal to other is due to |
| A. | force |
| B. | power |
| C. | energy |
| D. | resistance |
| Answer» D. resistance | |
| 879. |
For safety, appliances should be equipped with |
| A. | magnets |
| B. | resistors |
| C. | live wire |
| D. | earth wire |
| Answer» E. | |
| 880. |
The electromagnetic effect of track and train |
| A. | attracts the train towards the track |
| B. | pulls the train towards the track |
| C. | repels the train from the track |
| D. | detracks the train from the rail |
| Answer» D. detracks the train from the rail | |
| 881. |
The second thing on which used amount of energy depends, is |
| A. | amount of energy supplied |
| B. | amount of resistance |
| C. | power of the appliance |
| D. | length of the wire used |
| Answer» D. length of the wire used | |
| 882. |
The symbol of potassium is |
| A. | Po |
| B. | K |
| C. | Ps |
| D. | Pa |
| Answer» C. Ps | |
| 883. |
Sodium becomes a cation when |
| A. | it loses a proton |
| B. | it gains a proton |
| C. | it loses an electron |
| D. | it gains an electron |
| Answer» D. it gains an electron | |
| 884. |
The formula that shows the number and kind of atoms which a substance of a molecule contained, is known as |
| A. | chemical formula |
| B. | atomic formula |
| C. | compound formula |
| D. | molecular formula |
| Answer» B. atomic formula | |
| 885. |
Radioactive particles give off |
| A. | waves |
| B. | rays |
| C. | energy |
| D. | light |
| Answer» C. energy | |
| 886. |
Sodium ion has |
| A. | positive charge |
| B. | negative charge |
| C. | no charge |
| D. | may be positive or negative |
| Answer» B. negative charge | |
| 887. |
At room temperature, ionic bonds are |
| A. | gas |
| B. | solids |
| C. | liquids |
| D. | semi solids |
| Answer» C. liquids | |
| 888. |
The symbol of 'neon gas' is |
| A. | Ne |
| B. | Na |
| C. | N |
| D. | Mg |
| Answer» B. Na | |
| 889. |
The rays that can penetrate into metal are |
| A. | x-rays |
| B. | ultra violet rays |
| C. | gamma rays |
| D. | radio waves |
| Answer» D. radio waves | |
| 890. |
The particles which have equal mass are |
| A. | protons and electrons |
| B. | protons and neutrons |
| C. | neutrons and electrons |
| D. | photons and protons |
| Answer» C. neutrons and electrons | |
| 891. |
The number and arrangement of electrons in an atom are important because it controls |
| A. | the physical properties of atom |
| B. | the chemical properties of atom |
| C. | the size of atom |
| D. | all of above |
| Answer» C. the size of atom | |
| 892. |
Little free space is found between particles in |
| A. | liquids |
| B. | gases |
| C. | solids |
| D. | solids and liquids |
| Answer» E. | |
| 893. |
The maximum number of electrons first shell can hold is |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» C. 4 | |
| 894. |
The atomic number of 'oxygen' is |
| A. | 8 |
| B. | 10 |
| C. | 12 |
| D. | 14 |
| Answer» B. 10 | |
| 895. |
The ion with a negative charge, is known as |
| A. | cation |
| B. | anion |
| C. | positron |
| D. | negatron |
| Answer» C. positron | |
| 896. |
The more the neutrons in an atom, the |
| A. | lighter it is |
| B. | heavier it is |
| C. | brighter it is |
| D. | cooler it is |
| Answer» C. brighter it is | |
| 897. |
The number of bonds an atom can form is called |
| A. | power of atom |
| B. | valency of atom |
| C. | strength of atom |
| D. | capacity of atom |
| Answer» C. strength of atom | |
| 898. |
A charged atom is called |
| A. | ion |
| B. | charger |
| C. | positron |
| D. | negatron |
| Answer» B. charger | |
| 899. |
Gamma rays are used to detect |
| A. | faults in human body |
| B. | faults in metals |
| C. | thieves and robbers |
| D. | weapons |
| Answer» C. thieves and robbers | |
| 900. |
Gamma rays are also used to check the |
| A. | strength of metals |
| B. | properties of metal |
| C. | thickness of metal |
| D. | all of them |
| Answer» D. all of them | |