Ncert – class 10- science – Chapter 11 – Electricity 2 Welcome to your Ncert – class 10- science – Chapter 11 – Electricity 2 1. If 5 resistors of 2.5Ω each are connected in parallel then what would be its resultant resistance? 25Ω 1Ω 5Ω 1/5Ω None 2. 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 3. 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 6Ω 12Ω 24Ω None 4. Inside a cell in a closed circuit the conventional electric current may travel from -ve terminal to +ve terminal may travel from +ve terminal to -ve terminal always travels from - ve terminal to + ve terminal always travels from + ve terminal to - ve terminal None 5. When resistors are connected in parallel, the current divides in the ................... None of these Inverse ratio of resistances Inverse ratio of the potential differences Direct ratio of resistances None 6. An electric bulb is rated 220 V and 100 W, when it is operated on 110 V, the power consumed will be 25 W 100 W 75 W 50 W None 7. In series combination of resistances: p.d. is same across each resistance. total resistance is reduced current is same in each resistance all above are true. None 8. 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 50 W 75 W 100 W None 9. Which unit is not used in either the definition of the coulomb or the definition of the volt? ampere second ohm joule None 10. Inside a cell in a closed circuit the conventional electric current: may travels from −ve terminal to +ve terminal may travels from +ve terminal to −ve terminal always travels from + ve terminal to -ve terminal always travels from −ve terminal to +ve terminal None 11. 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 Half Remains same None 12. A toaster operating at 240V has a resistance of 120Ω. The power is 240W 480W 400W 200W None 13. 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: 544Ω 17Ω 272Ω 68Ω None 14. When three resistors of resistances 3Ω,4Ω and 5Ω are connected in parallel, the currents through them are in the ratio 3:4:5 20:15:12 5:4:3 9:8:7 None 15. 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 doubled the radius of the wire is doubled the length of the wire is doubled both the length and the radius of the wire are halved None 16. A uniform wire is cut into 1010 equal parts and all the equal parts are connected in parallel. The effective resistance increases 100 times decreases 10 times decreases 100 times increases 10 times None 17. The commercial unit of electric energy is kilowatt−hour (kWh), commonly known as: None of these Curie Faraday Unit None 18. Three 2Ω resistors are connected to form a triangle. The resistance between any two corners is? 2Ω 6Ω 3/4 Ω 4/3 Ω None 19. 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 4 min 8 min 25 min None 20. 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 1:4 1:8 1:16 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.
