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. Fuse wire is made up of alloys of High boiling point Low boiling point High melting point Low melting point None 2. Which of the following is an essential element in an electric circuit ? switch voltmeter connecting wires ammeter None 3. Electromagnet is used in Electric bell Battery Fuse Dry cell None 4. The longer line in the symbol of a cell denotes the direction of current all of these the positive terminal the negative terminal None 5. Filament of electric bulb is made up of Low melting point Low boiling point High melting point High boiling point None 6. A rheostat is used in an electrical circuit to change the potential difference. to change the resistance of the circuit. to change the emf. to change the current through a particular instrument. None 7. A device which prevents or allows the current to flow through it Switch Motor Conductor Terminal None 8. The strength of the magnetic field due to a solenoid can be increased by by winding solenoid around a plastic rod increasing the number of turns in the solenoid all of the above decreasing the current strength in the solenoid None 9. 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 wire strip as fuses . We should use ISI marked MCBs We should use conductors with high melting point in fuses . None 10. When an electric current passes through a solenoid, it acts as a/an insulator electric bell resistor bar magnet 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. Which of the following is a characteristic of a buzzer? It has different mechanism from electric bell. It has higher frequency of collision of gong and hammer It uses only AC power supply None of the above None 13. Electromagnet loses its magnetic property when Heat is increased Current is switched OFF Current is very high Current is switched ON None 14. The magnetic effect of the current was discovered by _ ? Ohm Joule Oersted Newton None 15. Electrons are ___________ particles. Neutral Negatively charged Positively charged Current None 16. Compact fluorescent lamps (CELs) are considered better than ordinary electric bulbs because ? CFLs can be fixed in the ordinary bulb holders . Both CFLs reduce wastage and CFLs can be fixed in the ordinary bulb holders . None of these CFLs reduce wastage 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 Ferromagnetic strip Gong None 18. Electric current is measured by a device 19. Electric current is said to be pass through a wire when Only electron passes through it Both electron and neutron pass through it Only proton pass through it No particle pass through it None 20. Which of the following is an advantage of using electrical symbol? It helps in solving the circuits. All of the above. It makes the circuit drawing easier. It makes the representation of electrical component easy. 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.
