10th Class Physics Chapter 7 Test16. Current Electricity

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

1. The usual range of ammeters for home appliances is:
   1. 1 A to 10 A
   2. 1 A to 100 A
   3. 100 A to 500 A
   4. Less than 1 A
2. Conventional current flows:
   1. From positive to negative terminal
   2. From negative to positive terminal
   3. In both directions
   4. In random motion
3. Ohm’s law is valid for:
   1. All devices
   2. Only ohmic devices
   3. Only non-ohmic devices
   4. Only semiconductors
4. When a battery is connected to a copper wire, the free electrons:
   1. Stop moving
   2. Move randomly
   3. Drift in one direction
   4. Attract protons
5. Temperature coefficient of resistivity (α) is:
   1. Negative for metals
   2. Positive for metals
   3. Zero for semiconductors
   4. Constant for all materials
6. To reduce disturbance in readings, the least count of ammeter and voltmeter should be:
   1. Very high
   2. Neglected
   3. Noted carefully
   4. Multiplied
7. The resistances of a metallic conductor varies inversely as:
   1. area of cross section
   2. length
   3. temperature
   4. all of these
8. Electric current is measured using:
   1. ammeter
   2. voltmeter
   3. ohmmeter
   4. meter rod
9. The circuit symbol for AC is:
   1. Straight line
   2. Wavy line
   3. Broken line
   4. Arrow
10. Ohm’s law states that current through a conductor is directly proportional to:
    1. Resistance
    2. Potential difference
    3. Power
    4. Energy