Physics Exam Questions PDF

1. What is the basis for declaring the direction of electric current is from positive terminal to negative terminal of a circuit? - Scientific (electric charge, higher potential) - Superposition (network analysis) - Conventional - Tradition 2. Which of the following will the effect...

1. What is the basis for declaring the direction of electric current is from positive terminal to negative terminal of a circuit? - Scientific (electric charge, higher potential) - Superposition (network analysis) - Conventional - Tradition 2. Which of the following will the effect of the electric shock in the human body depends on - Voltage flowing in the body - Current flowing in the body - Line Power - Resistance in the line 3. Which of the following conductors has the highest resistance? - Manganin 4.82 x 10^-7 Ω-m - Nichrome 11 x 10^-7 Ω-m - Constantan 4.9 x 10^-7 Ω-m - Steel 1.43 x 10^-⁷ Ω-m 4. In American wire gauge (AWG) as the number gage increase the wire diameter? - increase - decrease - does not change - does change 5. What is the value of the resistor with color coded Green-Blue-Red-Gold? - 56,000 ohm +10% - 56,000 ohm +5% - 5,600 ohm +10% - 5,600 ohm +5% 6. A copper bar is 1½ inch by 4 inches by 20 feet. If the resistivity of the copper bar is 10.37 ohms-cmf. What is the resistance of the copper bar? - 17.3 x10^-3 ohm - 8.15 x10^-5 ohm - 0.0052 ohm - 125 ohms 7. A cylindrical copper rod has a resistance R. It is reformed to twice its original length with NO change in volume. What is the new resistance? - 4R - 2R - 6R - 8R 8. Nine identical wires, each of diameter d and length L, are connected in series. The combination has the same resistance as a single similar wire of length L but whose diameter is - 3d - d/3 - 9d - d/9 9. A light bulb having a tungsten filament draws 0.5 Amp at 110 Volts. The cold resistance of the filament is 20 ohms at 20°C with temperature coefficient of resistance for tungsten at this temperature of 0.005 per °C. Determine the operating temperature of the bulb. - 2020°C - 520°C - 2520°C - 1220°C