10th Class Physics Chapter 10 TestELECTRONICS

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

1. The process of adding impurities to a pure semi condutor is called:

   1. Annealing

   2. Doping

   3. Heating

   4. Diffusion

2. What does the small bubble circle at the output of a NAND or NOR gate symbol represent?

   1. Amplification

   2. Inversion

   3. High voltage

   4. Ground connection

3. In the burglar alarm circuit, when light falls on the LDR, its resistance is ...... .

   1. High

   2. Low

   3. Infinite

   4. Negative

4. A binary variable has how many possible states?

   1. One

   2. Two

   3. Four

   4. Infinite

5. A NAND gate is formed by combining which two basic logic gates?

   1. OR and NOT

   2. AND and OR

   3. AND and NOT

   4. NOR and NOT

6. Which of the following is an example of a digital signal?

   1. Sound wave

   2. Light intensity

   3. ON/OFF switch

   4. Temperature

7. Boolean algebra uses three basic logic operations. Which of the following is NOT one of them?

   1. AND

   2. OR

   3. NOT

   4. NAND

8. In which type of circuits do voltages and currents vary smoothly and continuously within a certain range?

   1. Digital circuits

   2. Analog circuits

   3. Logic circuits

   4. Binary circuits

9. In ADC, rounding each sampled value to the nearest predefined level is called:

   1. Quantization

   2. Modulation

   3. Encoding

   4. Sampling

10. A NAND gate outputs a low (0) signal only when ...... .

    1. Both inputs are 0

    2. One input is 1 and the other is 0

    3. Both inputs are 1

    4. The circuit is open