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