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. Filament of electric bulb is made up of Low melting point High melting point High boiling point Low boiling point None 2. The strength of the magnetic field due to a solenoid can be increased by all of the above increasing the number of turns in the solenoid by winding solenoid around a plastic rod decreasing the current strength in the solenoid None 3. Which of the following is an advantage of using electrical symbol? It makes the circuit drawing easier. It helps in solving the circuits. All of the above. It makes the representation of electrical component easy. 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. Electromagnet is used in Electric bell Battery Dry cell Fuse None 6. Electrons are ___________ particles. Positively charged Neutral Negatively charged Current None 7. Electromagnet loses its magnetic property when Current is very high Heat is increased Current is switched ON Current is switched OFF None 8. Which of the following is a characteristic of a buzzer? None of the above It uses only AC power supply It has different mechanism from electric bell. It has higher frequency of collision of gong and hammer None 9. When an electric current passes through a solenoid, it acts as a/an electric bell insulator resistor bar magnet None 10. 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 11. Electric current is said to be pass through a wire when Only proton pass through it Both electron and neutron pass through it No particle pass through it Only electron passes through it None 12. 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 13. 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 . CFLs can be fixed in the ordinary bulb holders . CFLs reduce wastage None of these None 14. A rheostat is used in an electrical circuit to change the current through a particular instrument. to change the potential difference. to change the resistance of the circuit. to change the emf. None 15. Which of the following is an essential element in an electric circuit ? voltmeter ammeter connecting wires switch None 16. The magnetic effect of the current was discovered by _ ? Newton Joule Oersted Ohm None 17. A device which prevents or allows the current to flow through it Switch Terminal Motor Conductor None 18. 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 19. Fuse wire is made up of alloys of Low boiling point High boiling point High melting point Low melting point 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.
