10th Class Physics Chapter 9 Test18. Electronics

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

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. In an NPN transistor under normal operation, the emitter-base junction is:
   1. Reverse biased
   2. Forward biased
   3. Neutral
   4. Insulated
3. Which of the following is not a basic logic gate?
   1. AND
   2. OR
   3. NAND
   4. Amplifier
4. Materials whose electrical conductivity falls between conductors and insulators are called:
   1. Metals
   2. Insulators
   3. Semiconductors
   4. Superconductors
5. Which device is an example of analog electronics?
   1. Computer
   2. FM radio
   3. Digital camera
   4. Mobile phone
6. One major challenge in building quantum computers is that qubits must operate at:
   1. Room temperature
   2. High temperature
   3. Extremely low temperature
   4. Any temperature
7. A group of 8 bits is called a:
   1. Nibble
   2. Byte
   3. Word
   4. Logic
8. When boron is added to silicon, the resulting mixture is called:
   1. Intrinsic semiconductor
   2. N-type semiconductor
   3. P-type semiconductor
   4. Superconductor
9. Which of the following is a pentavalent impurity?
   1. Boron
   2. Gallium
   3. Phosphorus
   4. Aluminum
10. A transistor can be used as a switch if biased in:
    1. Forward and reverse regions
    2. Saturation and cut-off regions
    3. Neutral region
    4. Breakdown region