Ncert – class 10- science – Chapter 11 – Electricity 2 Welcome to your Ncert – class 10- science – Chapter 11 – Electricity 2 1. When resistors are connected in parallel, the current divides in the ................... Inverse ratio of the potential differences Inverse ratio of resistances None of these Direct ratio of resistances None 2. Inside a cell in a closed circuit the conventional electric current always travels from - ve terminal to + ve terminal may travel from +ve terminal to -ve terminal always travels from + ve terminal to - ve terminal may travel from -ve terminal to +ve terminal None 3. The commercial unit of electric energy is kilowatt−hour (kWh), commonly known as: Curie Faraday None of these Unit None 4. Which unit is not used in either the definition of the coulomb or the definition of the volt? second ohm ampere joule None 5. Inside a cell in a closed circuit the conventional electric current: always travels from −ve terminal to +ve terminal may travels from −ve terminal to +ve terminal may travels from +ve terminal to −ve terminal always travels from + ve terminal to -ve terminal None 6. If the resistance in the circuit is increased four times by keeping the potential difference the same, the current in the circuit is ___________. One fourth Four times Remains same Half None 7. Two wires A and B of same material and same mass have radius 2r and r and the length of the wire B is half the length of the wire A. If resistance of wire A is 34Ω, then resistance of B will be: 272Ω 544Ω 68Ω 17Ω None 8. In series combination of resistances: all above are true. current is same in each resistance p.d. is same across each resistance. total resistance is reduced None 9. If 5 resistors of 2.5Ω each are connected in parallel then what would be its resultant resistance? 25Ω 1/5Ω 5Ω 1Ω None 10. Two copper wires are of same length one of the twice as thick as the other. Then the resistance of the two wires are in the ratio of : 1:2 1:16 1:4 1:8 None 11. Two bulbs take 50 watts each when connected in parallel to 100 V source. The total power consumed by them when they are connected in series with the same source is 25 W 100 W 75 W 50 W None 12. A wire has resistance 12Ω12Ω. It is bent in the form of a circle. The effective resistance between the two points on any diameter of the circle is? 3Ω 12Ω 6Ω 24Ω None 13. A conductor of resistance 3Ω is stretched uniformly till its length is doubled. The wire is now bent in the form of an equilateral triangle. The effective resistance between the ends of any side of the triangle in Ω 8/3 9/2 2 1 None 14. A toaster operating at 240V has a resistance of 120Ω. The power is 480W 240W 400W 200W None 15. A uniform wire is cut into 1010 equal parts and all the equal parts are connected in parallel. The effective resistance decreases 10 times increases 100 times decreases 100 times increases 10 times None 16. A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if both the length and the radius of the wire are halved both the length and the radius of the wire are doubled the length of the wire is doubled the radius of the wire is doubled None 17. Three 2Ω resistors are connected to form a triangle. The resistance between any two corners is? 4/3 Ω 3/4 Ω 2Ω 6Ω None 18. An electric bulb is rated 220 V and 100 W, when it is operated on 110 V, the power consumed will be 50 W 25 W 75 W 100 W None 19. When three resistors of resistances 3Ω,4Ω and 5Ω are connected in parallel, the currents through them are in the ratio 20:15:12 3:4:5 9:8:7 5:4:3 None 20. An electric kettle has two heating coils. When one of the coils is connected to an AC source, the water in the kettle boils in 10 min. When the other coil is used the water boils in 40 min. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be 15 min 25 min 8 min 4 min 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.
