10th Class Physics 3rd Quarter Book Paper

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

1. To avoid thermal noise, qubits are cooled to within a few thousandths of a degree of:
   1. 0°C
   2. 100°C
   3. Absolute zero
   4. Boiling point of water
2. 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
3. Electricity ensures our devices remain functional by:
   1. Cooking food
   2. Recharging batteries
   3. Cooling the environment
   4. Producing light
4. In an NPN transistor under normal operation, the emitter-base junction is:
   1. Reverse biased
   2. Forward biased
   3. Neutral
   4. Insulated
5. Conventional current flows:
   1. From positive to negative terminal
   2. From negative to positive terminal
   3. In both directions
   4. In random motion
6. A thermistor is generally made from:
   1. Metal wire
   2. Semiconductor material
   3. Plastic
   4. Glass
7. Which of the following is not a basic logic gate?
   1. AND
   2. OR
   3. NAND
   4. Amplifier
8. Ohm’s law is valid for:
   1. All devices
   2. Only ohmic devices
   3. Only non-ohmic devices
   4. Only semiconductors
9. Active elements in a circuit:
   1. Absorb energy
   2. Supply or generate energy
   3. Block current
   4. Measure current
10. Materials whose electrical conductivity falls between conductors and insulators are called:
    1. Metals
    2. Insulators
    3. Semiconductors
    4. Superconductors
11. 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
12. In a resistor, the first two bands represent:
    1. Multiplier
    2. Tolerance
    3. Significant figures of resistance
    4. Voltage drop