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