1) 1. The internal resistance of a cell is due to a) A. Resistance offered by wires b) B. Resistance inside electrolyte c) C. Resistance of external circuit d) D. Temperature of surroundings 2) 2. The EMF of a cell is a) A. Potential difference across terminals when no current flows b) B. Potential difference when current is maximum c) C. Always equal to terminal voltage d) D. Always less than terminal voltage 3) 3. Terminal voltage of a cell is maximum when: a) A. Circuit is open b) B. Resistances are in series c) C. Current is maximum d) D. Internal resistance is infinite 4) 4. The correct relation between EMF (E), terminal voltage (V), current (I), and internal resistance (r) is: a) b) c) d) 5) 5. Internal resistance increases when: a) A. Temperature increases b) B. Temperature decreases c) C. Length of wire increases d) D. Cell is short-circuited 6) 6. A potentiometer is preferred over a voltmeter because: a) A. It is cheaper b) B. It measures current directly c) C. It measures potential difference accurately without drawing current d) D. It gives approximate readings 7) 7. Potentiometer gives more accurate results because: a) A. It uses digital display b) B. It has infinite resistance c) C. It draws negligible current from the cell d) D. It has a pointer scale 8) 8. Potentiometer works on the principle of: a) A. Ohm’s law b) B. Null deflection method c) C. Electromagnetic induction d) D. Magnetic flux conservation 9) 9. A voltmeter cannot measure exact EMF of a cell because: a) A. It is not calibrated b) B. Its resistance is zero c) C. It draws some current from the cell d) D. Its pointer is inaccurate 10) 10. For greater accuracy, a potentiometer wire should be: a) A. Very short and thick b) B. Long and uniform c) C. Non-uniform d) D. Insulated

JKC 6. Internal Resistance of Cell & Potentiometer

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