1st Year Physics Chapter 11 Test11. Electricity

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Drift velocity is produced when
   1. No electric field exists
   2. A potential difference is applied
   3. Temperature decreases
   4. Conductor is cooled
2. Kirchhoff's Current Law states that:
   1. Sum of voltages in a circuit is zero
   2. Voltage is constant
   3. Current is same everywhere
   4. Sum of currents entering a junction equals sum leaving
3. In the potentiometer equation E2 = (l2/l1) E1, the quantities l1 and l2 represent
   1. Current
   2. Resistances
   3. Balancing lengths
   4. Time intervals
4. A potentiometer works on the principle of
   1. Heating effect
   2. Null method
   3. Resonance
   4. Magnetic induction
5. Which one of the following electrical devices helps us to measure the accurate value of emf?
   1. meter Bridge
   2. voltmeter
   3. multimeter
   4. potentiometer
6. The SI unit of resistivity is:
   1. Ohm
   2. Ohm-meter
   3. Siemens
   4. Coulomb
7. In order to achieve high accuracy, the slide wire of a potentiometer should be:
   1. as long as possible.
   2. as short as possible.
   3. neither too small nor too large.
   4. very thick.
8. If load resistance is much greater than internal resistance, power delivered to load becomes:
   1. Maximum
   2. Zero
   3. Very low
   4. Infinite
9. Maximum power output is given by:
   1. e²/r
   2. e²/4R
   3. e²/4r
   4. e/R
10. Electric potential is defined as:
    1. Work done per unit mass
    2. Work done per unit distance
    3. Work done per unit time
    4. Work done per unit charge