Ncert- science – class 7- Chapter 10 – Electric Current and Its Effects 1 Welcome to your Ncert- science – class 7- Chapter 10 – Electric Current and Its Effects 1 1. Which of the following is the best option while considering the safety of household electric appliances ? We should use wire strip as fuses . We should use non-ISI marked MCBs We should use conductors with high melting point in fuses . We should use ISI marked MCBs None 2. Which of the following is an essential element in an electric circuit ? ammeter switch connecting wires voltmeter None 3. Fuse wire is made up of alloys of Low boiling point High melting point High boiling point Low melting point None 4. Compact fluorescent lamps (CELs) are considered better than ordinary electric bulbs because ? None of these CFLs can be fixed in the ordinary bulb holders . Both CFLs reduce wastage and CFLs can be fixed in the ordinary bulb holders . CFLs reduce wastage None 5. Electric current is measured by a device 6. When an electric current passes through a solenoid, it acts as a/an resistor electric bell insulator bar magnet None 7. Electromagnet loses its magnetic property when Current is switched OFF Heat is increased Current is switched ON Current is very high None 8. The longer line in the symbol of a cell denotes the positive terminal the negative terminal the direction of current all of these None 9. Electrons are ___________ particles. Neutral Negatively charged Current Positively charged None 10. Which of the following is an advantage of using electrical symbol? It helps in solving the circuits. It makes the circuit drawing easier. It makes the representation of electrical component easy. All of the above. None 11. Electric current is said to be pass through a wire when Both electron and neutron pass through it Only electron passes through it No particle pass through it Only proton pass through it None 12. The strength of the magnetic field due to a solenoid can be increased by all of the above increasing the number of turns in the solenoid by winding solenoid around a plastic rod decreasing the current strength in the solenoid None 13. Which of the following is a characteristic of a buzzer? None of the above It has different mechanism from electric bell. It has higher frequency of collision of gong and hammer It uses only AC power supply None 14. A rheostat is used in an electrical circuit to change the potential difference. to change the emf. to change the resistance of the circuit. to change the current through a particular instrument. None 15. Electromagnet is used in Electric bell Fuse Battery Dry cell None 16. Electric current is said to be pass through a wire when Only electron passes through it Only proton pass through it No particle pass through it Both electron and neutron pass through it None 17. The magnetic effect of the current was discovered by _ ? Ohm Joule Oersted Newton None 18. Which of the following is not a component of electric bell? Ferromagnetic strip Low magnetic field permanent magnet to attract ferromagnetic strip None of the above Gong None 19. Filament of electric bulb is made up of Low boiling point High melting point Low melting point High boiling point None 20. A device which prevents or allows the current to flow through it Conductor Switch Motor Terminal None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
