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. Which of the following is not a component of electric bell? None of the above Low magnetic field permanent magnet to attract ferromagnetic strip Ferromagnetic strip Gong None 2. Electromagnet is used in Electric bell Fuse Dry cell Battery None 3. Which of the following is an advantage of using electrical symbol? It makes the representation of electrical component easy. It helps in solving the circuits. All of the above. It makes the circuit drawing easier. None 4. 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 5. The magnetic effect of the current was discovered by _ ? Joule Newton Ohm Oersted None 6. Fuse wire is made up of alloys of Low melting point High melting point Low boiling point High boiling point None 7. 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 8. Electrons are ___________ particles. Positively charged Neutral Current Negatively charged None 9. The longer line in the symbol of a cell denotes the negative terminal the positive terminal the direction of current all of these None 10. 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 ISI marked MCBs We should use non-ISI marked MCBs We should use conductors with high melting point in fuses . None 11. Electric current is measured by a device 12. Electromagnet loses its magnetic property when Current is switched OFF Current is switched ON Heat is increased Current is very high None 13. Filament of electric bulb is made up of High melting point Low boiling point Low melting point High boiling point None 14. Which of the following is an essential element in an electric circuit ? switch ammeter voltmeter connecting wires None 15. Which of the following is a characteristic of a buzzer? It has higher frequency of collision of gong and hammer It has different mechanism from electric bell. It uses only AC power supply None of the above None 16. 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 17. A rheostat is used in an electrical circuit to change the resistance of the circuit. to change the current through a particular instrument. to change the potential difference. to change the emf. None 18. When an electric current passes through a solenoid, it acts as a/an resistor bar magnet electric bell insulator None 19. Compact fluorescent lamps (CELs) are considered better than ordinary electric bulbs because ? None of these Both CFLs reduce wastage and CFLs can be fixed in the ordinary bulb holders . CFLs reduce wastage CFLs can be fixed in the ordinary bulb holders . None 20. A device which prevents or allows the current to flow through it Switch Motor Conductor Terminal 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.
