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