11/03/2020 Electricity (Study by Topics Junior Class) 0Comments by Gate Academy Welcome to your Electricity (Study by Topics Junior Class) NAME EMAIL PHONE NUMBER 1. When two 2Ω resistances are in parallel, the effective resistance is1 Ω2 Ω0.5 Ω4 Ω2. What is resistance?An increase in currentOpposition to currentEnergy from batteryAn increase in voltage3. A drawing that uses symbols to show how the parts of an electric circuit are connected is a/an _____Electric diagramNichrome wireParallel circuitCircuit diagram4. A circuit must have which of the following?Battery, wire, switchEnergy source, wire, switchEnergy source, battery, loadEnergy source, wire, load5. Which is the correct unit for current?OhmsWattsAmperesVolts6. If in the given arrangement, the three resistors are replaced by a single resistor; then its resistance will be:9Ω6Ω18Ω4Ω7. The current flowing in a conductor is proportional to1/ area of cross sectionDrift velocity1/no of electronsSquare of area of cross section8. What is the unit for energy? JoulesWattVoltsOhms9. A power source than can produce an electric current as a result of a chemical change in it is a/an _________WireCircuitBatteryFilament10. Keeping the potential difference constant, the resistance of the circuit is halved. The current will become:One-fourthHalfFour timesDouble11. A toaster operating at 240V has a resistance of 120Ω. The power is480 W400 W2 W240 W12. Electric current in a/an _____________________ circuit travels in ONE path. ElectricSeriesWireParallel13. What is the function of a fuse?A protective device for breaking an electric circuit.Another name for a switchA protective device to slow down the currentA wire with high resistance to prevent current from passing through14. Which device is used to measure current? AmmeterResistorCircuit beakerVoltmeter15. V1, V2 and V3 are the potential differences across the 1Ω, 2Ω and 3Ω resistors in the following diagram, and the current is 5A.Which of the following shows the correct values of V1, V2 and V3measured in volts?V1 =1, V2 = 2 and V3 = 3V1 =5, V2 = 10 and V3 = 15V1 =5, V2 = 2.5 and V3 = 1.6V1 =4, V2 = 3 and V3 = 216. When a current 'I' flows through a resistance 'R' for time 't' the electrical energy spent is given by I²RtIRtIR²tI²R/t17. A low-resistance connection established by accident or intention between two points in an electric circuit is known as _____Short circuitDirect circuitClosed circuitOpen circuit18. A material through which electric current CAN pass easily in a/an ____ InsulatorConductorTesterReceptor19. A wire of resistance R1 is cut into five equal pieces. These five pieces of wire are then connected in parallel. If the resultant resistance of this combination be R2, then the ratio R1/ R2 is:1/255251/520. Which device is used to measure voltage?ResistorAmmeterVoltmeterCircuit beaker21 out of 20Time is Up!