Electric Current One Liner Questions & Answers
| Questions | Answers | |
| 1 | A 100-watt electric bulb is used for 10 hours. What will be the cost of electricity consumed, if the consumption cost is Rs. 5 per unit? | Rs. 5 |
| 2 | If a bulb of 100 watt burns for 10 hours, the expenditure of electricity will be – | 1 unit |
| 3 | Five bulbs each of 100-watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be – | Ten units |
| 4 | The value of 1 kilowatt hour is – | 3.6 × 106J |
| 5 | An electric bulb of 100 watts is used for 4 hours. The unit of electric energy used is – | 0.4 |
| 6 | How many units of electricity will be consumed if you use a 60-watt electric bulb for 5 hours every day for 30 days? | 9 |
| 7 | An electric bulb is connected to a 220 v generator. The current is 0.5 A. The power of the bulb is – | 110 w |
| 8 | The total resistance of a circuit having two parallel resistors is 1.403 kilo-ohm. If one of the resistors is 2.0 kilo-ohm, then the other resistor will be – | 4.70 kilo-ohm |
| 9 | A dynamo which is said to generate electricity actually acts as a – | Converter of energy |
| 10 | ‘Dynamo’ is a device, which converts – | Mechanical energy into electrical energy |
| 11 | When electrical energy is converted into motion – | There is no heat loss |
| 12 | A device which converts electrical energy into mechanical energy is – | Electric motor |
| 13 | The device which works on the principle of electromagnetic induction is – | Dynamo & Electric motor |
| 14 | A device which converts chemical energy into electrical energy is called – | Battery |
| 15 | Electric motors operating at low voltages tend to burn out because – |
They draw more current which is inversely proportional to the voltage
|
| 16 | Faraday constant – | Is a universal constant |
| 17 | Which metals are used as filaments in lighting bulbs? | Tungsten |
| 18 | The temperature of the filament of lighted electric bulb is generally – | 2000oC to 2500oC |
| 19 | Lightning can even burn a tree because it contains tremendous amount of – | Electric energy |
| 20 | In a three-pin electrical plug longest pin should be connected to – | Ground terminal |
| 21 | In electric apparatus ‘earth’ is used – | For safety |
| 22 | The electric current does not flow between two properly connected charged bodies if they are having – | Same potential |
| 23 | The principle of fuse is – | Heating effect of electricity |
| 24 | A fuse wire is characterized by – | High resistance and low melting point |
| 25 | The filament of a halogen lamp is an alloy of – | Tungsten and sodium |
| 26 | Domestic electrical wiring is basically a – | Parallel connection |
| 27 | A wire with black insulation during electric supply is– | Neutral wire |
| 28 | What is the order of magnitude of electric resistance of the human body (dry)? | 104 ohm |
| 29 | Full form of C.F.L. is – | Compact Fluorescent Lamp |
| 30 | Light Emitting Diode (LED) work on principle of – | Electroluminescence |
| 31 | What gases are filled in fluorescent tube? | Mercury and neon |
| 32 | How does the white light produce in the tube? | By oscillating the molecules |
| 33 | Fluorescent tubes are filled with a choke. The choke coil – | Steps up the line voltage |
| 34 | If potential difference and current flowing through a wire is increased twice each then electric power – | Will increase four times |
| 35 | Two wires have their lengths, diameters, and resistivity all in the ratio of 1: 2. If the resistance of the thinner wire is 10 ohm, the resistance of the thicker wire is – | 10 ohm |
| 36 | Small drops of the same size are charged to V volts each. If n such drops coalesce to form a single large drop, its potential will be – | N2/3 V |
| 37 | The transformer is used for – | To step-up or step-down AC voltages |
| 38 | A mobile phone charger is – | A step down transformer |
| 39 | The basic difference between an AC generator and a DC generator is that – |
The AC generator has slip rings while the DC generator has a commutator
|
| 40 | Alternate current is not preferable – | To charge storage battery |
| 41 | The device used for converting alternating current to direct current is called – | Rectifier |
| 42 | The earth’s magnetic field is due to – | Currents circulating inside the core |
| 43 | What is the source of electrical energy in an artificial satellite? | Solar cells |
| 44 | Which elements are used in solar cells? | Silicon |
| 45 | Photovoltaic cells are – | Solar cells |
| 46 | Photovoltaic cells are related to – | Solar Energy |