Ncert- science – class 7- Chapter 10 – Electric Current and Its Effects 2 Welcome to your Ncert- science – class 7- Chapter 10 – Electric Current and Its Effects 2 1. Which one of the following heater element is used in electric press Iron wire Lead wire Copper wire Nichrome wire None 2. When electric current passes through the filaments of a bulb, it starts emitting light due to: Magnetic effect of electric current Chemical effect of electric current Lighting effect of electric current Heating effect of electric current None 3. The components required to make a simple series circuit to light a bulb are Wires and cell Cell and switch Bulb and wires Both Cell, switch and Bulb, wires None 4. What happens to a circuit when the switch is off? Electricity flows discontinuously There is a gap in the circuit Electricity flows continuously The circuit is complete None 5. When the switch of an electric bell is on then electric current in it : First flows in one direction and after sometime in other direction Flows in beginning and then stops forever Flows and stops in succession Flows continuously None 6. Which pair is not correct for the instruments used in the laboratory and their uses from the following? Resistor - To supply the electric energy to circuit Voltmeter - To measure the electric potential differene Galvanometer - To detect the presence of current Ammeter - To measure the electric current None 7. An electric bell works on the .......... effect of a current and uses an .......... Heating, Electromagnet Magnetic, Electromagnet Heating, Permanent magnet Magnetic, Permanent magnet None 8. What must happen for an electromagnet to have a magnetic field? It must be lined up with earth's magnetic field It must be heated. It must be connected to an electrical source. It must be touching another magnet. None 9. A fuse is used in an electrical appliance : To protect the appliance and its cable To change the current rating of the applicance To change the efficiency of the applicance To earth the appliance None 10. The essential requirements for a good heating element are _________________. High resistivity and low melting point Low resistivity and high melting point High resistivity and high melting point Low resistivity and low melting point None 11. Electromagnets are made up of: Soft iron copper steel aluminum 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.
