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.
| 751. |
The discovery which was made by Hans Oersted was used by an |
| A. | British scientist |
| B. | French scientist |
| C. | English scientist |
| D. | Chinese scientist |
| Answer» D. Chinese scientist | |
| 752. |
A good permanent magnet should produce a high magnetic field with a |
| A. | high mass |
| B. | low mass |
| C. | dense mass |
| D. | thick mass |
| Answer» C. dense mass | |
| 753. |
Shiny objects are often made by electroplating steel with |
| A. | nickel |
| B. | titanium |
| C. | chromium |
| D. | zinc |
| Answer» D. zinc | |
| 754. |
Ammeter can be connected |
| A. | before the cell or battery |
| B. | before the bulb |
| C. | after the bulb |
| D. | anywhere |
| Answer» E. | |
| 755. |
Electricity is formed by |
| A. | positively charged ions |
| B. | negatively charged ions |
| C. | electrons |
| D. | protons |
| Answer» D. protons | |
| 756. |
The more the resistors to a circuit, the |
| A. | lower the resistance |
| B. | higher the resistance |
| C. | same the resistance |
| D. | resistance may vary |
| Answer» C. same the resistance | |
| 757. |
A current carrying conductor has a |
| A. | magnetic field |
| B. | current capacity |
| C. | voltage capacity |
| D. | resistance capacity |
| Answer» B. current capacity | |
| 758. |
In our daily life, we find most of the compounds contain |
| A. | sodium |
| B. | chlorine |
| C. | oxygen |
| D. | hydrogen |
| Answer» B. chlorine | |
| 759. |
Charges in an atom are |
| A. | positive only |
| B. | negative only |
| C. | neutral |
| D. | both positive and negative |
| Answer» E. | |
| 760. |
When the switch is turned off, the iron bar |
| A. | holds its magnetism |
| B. | loses its magnetism |
| C. | gains current |
| D. | gains voltage |
| Answer» C. gains current | |
| 761. |
The larger the current, the greater the number of |
| A. | volts |
| B. | amperes |
| C. | pascal |
| D. | ohms |
| Answer» C. pascal | |
| 762. |
When the current flows one way, the magnet forces push the electromagnet and cone |
| A. | inwards |
| B. | forwards |
| C. | backwards |
| D. | outwards |
| Answer» E. | |
| 763. |
Small magnets are also used in |
| A. | dynamos |
| B. | plugs |
| C. | resistors |
| D. | fuses |
| Answer» B. plugs | |
| 764. |
One method of making a strong electromagnet is to increase |
| A. | voltage in coil |
| B. | resistance in coil |
| C. | number of turns in coil |
| D. | the size of iron bar |
| Answer» D. the size of iron bar | |
| 765. |
The bulb glows because the filament is |
| A. | negatively charged |
| B. | heated up |
| C. | positively charged |
| D. | cooled down |
| Answer» C. positively charged | |
| 766. |
The complete equipment of 'electrolysis' is known as |
| A. | electrolytic cell |
| B. | electrolytic circuit |
| C. | electrolytic current |
| D. | electrolytic process |
| Answer» B. electrolytic circuit | |
| 767. |
The repulsion between magnetic field of coil and permanent magnet makes the coil |
| A. | halt |
| B. | cease |
| C. | rotate |
| D. | attract |
| Answer» D. attract | |
| 768. |
When the current flows opposite way, the cone is pulled |
| A. | inwards |
| B. | forward |
| C. | backward |
| D. | outwards |
| Answer» B. forward | |
| 769. |
When there is high current, the circuit breaker is switched off because of |
| A. | electromagnetic strength |
| B. | magnetic strength |
| C. | electric strength |
| D. | energy of voltage |
| Answer» B. magnetic strength | |
| 770. |
'Semiconductors' are used in |
| A. | dynamos |
| B. | generators |
| C. | electronics |
| D. | electrical appliances |
| Answer» D. electrical appliances | |
| 771. |
A 50v current can |
| A. | kill you |
| B. | electrocute you |
| C. | give you a nasty shock |
| D. | make your body burst |
| Answer» B. electrocute you | |
| 772. |
Never use an electric appliance while standing in |
| A. | dry pool |
| B. | water |
| C. | stairs |
| D. | street |
| Answer» C. stairs | |
| 773. |
The weakest link in a circuit is formed by a |
| A. | fuse |
| B. | resistor |
| C. | thermistor |
| D. | transistor |
| Answer» B. resistor | |
| 774. |
To overcome the resistance |
| A. | power has to be used |
| B. | force has to be used |
| C. | more current has to be used |
| D. | energy has to be used |
| Answer» E. | |
| 775. |
When bulbs are arranged in series, the bulbs would glow |
| A. | brighter |
| B. | dimmer |
| C. | sharper |
| D. | none of above |
| Answer» C. sharper | |
| 776. |
The metal with the highest resistance is |
| A. | silver |
| B. | aluminum |
| C. | sodium |
| D. | tungsten |
| Answer» E. | |
| 777. |
Before attempting any repair or adjusting an appliance, the power should be turned off, from |
| A. | mains supply |
| B. | circuit breaker |
| C. | socket switch |
| D. | appliance switch |
| Answer» B. circuit breaker | |
| 778. |
Due to change in the form of energy, the conductor gets |
| A. | more resistance |
| B. | less resistance |
| C. | cold |
| D. | hot |
| Answer» E. | |
| 779. |
Voltmeter is always connected in |
| A. | parallel |
| B. | series |
| C. | both a and b |
| D. | pulleys |
| Answer» B. series | |
| 780. |
Most electric bulbs have a coil of thin tungsten wire known as |
| A. | coil |
| B. | filament |
| C. | spring |
| D. | terminal |
| Answer» C. spring | |
| 781. |
When one or more solutes dissolve in a solvent they make a |
| A. | solute |
| B. | solvent |
| C. | mixture |
| D. | solution |
| Answer» E. | |
| 782. |
The number of factors on which solubility depends, is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 783. |
The bee sting is acidic in nature which can be neutralized and made less painful by applying |
| A. | soap |
| B. | lemon juice |
| C. | vinegar |
| D. | antacid |
| Answer» B. lemon juice | |
| 784. |
Tooth decay occurs in our mouth due to presence of |
| A. | bacteria |
| B. | virus |
| C. | fungus |
| D. | algae |
| Answer» B. virus | |
| 785. |
In alcohol, salt is |
| A. | soluble |
| B. | insoluble |
| C. | reactive |
| D. | completely soluble |
| Answer» C. reactive | |
| 786. |
'Malic acid' is present in |
| A. | orange |
| B. | lemon |
| C. | apple |
| D. | guava |
| Answer» D. guava | |
| 787. |
The substance which is being dissolved in a liquid is called |
| A. | solute |
| B. | solvent |
| C. | mixture |
| D. | product |
| Answer» B. solvent | |
| 788. |
When a small amount of solute dissolves in a given amount of solvent it makes |
| A. | dilute solution |
| B. | saturated solution |
| C. | aqueous solution |
| D. | concentrated solution |
| Answer» B. saturated solution | |
| 789. |
Mineral water, fizzy drinks and tea are |
| A. | solvents |
| B. | solutions |
| C. | solutes |
| D. | mixture |
| Answer» C. solutes | |
| 790. |
Paint gets dissolved in |
| A. | alcohol |
| B. | turpentine |
| C. | water |
| D. | acetone |
| Answer» C. water | |
| 791. |
Vinegar contains an acid "acetic acid" which has other name |
| A. | ethanoic acid |
| B. | acetic acid |
| C. | citric acid |
| D. | carbonic acid |
| Answer» B. acetic acid | |
| 792. |
Mass of a solution is equal to the mass of solvent plus |
| A. | mass of solute |
| B. | mass of product |
| C. | mass of heat |
| D. | surface area |
| Answer» B. mass of product | |
| 793. |
A mixture of different types of indicators that is used to determine the acidity of a substance is called |
| A. | indicator |
| B. | pH scale |
| C. | pH meter |
| D. | universal indicator |
| Answer» E. | |
| 794. |
Acidic soil and lake water can be neutralize by addition of |
| A. | acid rain |
| B. | fertilizers |
| C. | lime |
| D. | caustic soda |
| Answer» D. caustic soda | |
| 795. |
The taste of acid is |
| A. | bitter |
| B. | sour |
| C. | sweet |
| D. | salty |
| Answer» C. sweet | |
| 796. |
Zero is the percentage of solubility of salt in |
| A. | water |
| B. | alcohol |
| C. | acid |
| D. | base |
| Answer» C. acid | |
| 797. |
If an alkali is added to acid, it's acidic nature will be |
| A. | enhanced |
| B. | reduced |
| C. | same |
| D. | constant |
| Answer» C. same | |
| 798. |
Copper sulphate has solubility at 25 °C in 100 g of water equal to |
| A. | 22g |
| B. | 20g |
| C. | 12g |
| D. | 44g |
| Answer» B. 20g | |
| 799. |
Strong 'alkalis' are |
| A. | highly corrosive |
| B. | medium corrosive |
| C. | normal corrosive |
| D. | less corrosive |
| Answer» B. medium corrosive | |
| 800. |
Bacteria in our mouth are acidic which should be neutralized by |
| A. | toothpaste |
| B. | orange juice |
| C. | vinegar |
| D. | antacid |
| Answer» B. orange juice | |