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