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