NBSE Class 10 Question Paper 2022 Electronics & Hardware (Vocational)

Total number of printed pages : 2 NB-T/E&H(V)/1 2022 Electronics & Hardware (Vocational) Total marks : 50 Time : 2 hours General instructions : i) Approximately 15 minutes is allotted to read the question paper and revise the answers. ii) All questions are compulsory except Q. nos.18 to 23 where general option is given. iii) The question paper consists of 23 questions. iv) Marks allocated to every question are indicated against it. N.B: Check to ensure that all pages of the question paper are complete as indicated on the top left side. 1. Choose the correct answer from the given alternatives: 10x1=10 i. The total load in a circuit should not exceed (a) 800 watt (b) 900 watt (c) 1000 watt (d) 1100 watt ii. Which electrolyte is used in a storage cell? (a) acetic acid (b) nitric acid (c) citric acid (d) sulphuric acid iii. How many diodes is/are used in a bridge rectifier? (a) one (b) two (c) three (d) four iv. Which type of switch is used in staircase wiring? (a) one way (b) two way (c) three way (d) four way v. Which of the following battery is used in emergency light? (a) nickel cadmium battery (b) nickel metal hydride battery (c) lithium battery (d) lead acid battery vi. Water heater works on the principle of? (a) Juole’s law (b) Ohm’s law (c) Ampere’s law (d) Boyle’s law vii. Electric geyser is used to get (a) pure water (b) hot water (c) distill water (d) cold water viii. Which of the following is from a renewable source? (a) petrol (b) coal (c) wood (d) hydro ix. Which of the following is also known as frequency oscillating circuit? (a) open circuit (b) closed circuit (c) parallel circuit (d) inverter circuit x. Which of the following is used to test circuit bell? (a) multimeter (b) voltmeter (c) series yerst lamp (d) tester

-2- NB-T/E&H(V)/1 Answer the following questions in one word or one sentence: 2. Name any two types of transformers according to its application. 1 3. What is the role of a battery? 1 4. Mention any two cell composition of batteries. 1 5. What is a transformer? 1 6. Name the types of earthing. 1 7. What is the function of bearings in electric motor? 1 8. Mention any two skills to succeed in life. 1 9. What is a step down transformer? 1 Answer the following questions in 20-50 words: 10. Write any two applications of solar cell. 2 11. What are single phase motors? Name any two domestic appliances where single phase motors are used. 2 12. What is MCB? Name any two principles of operation of an MCB. 2 13. Why is a regulated DC power supply needed in electronic devices? 2 14. Name any four types of single phase motors. 2 15. What is computer hardware? Write any two examples. 2 16. Name any two wire joints and write their uses. 2 17. Distinguish between self employment and wage employment. 2 Answer any four from the following questions in 60-100 words: 18. State the working principle of transformer. 4 19. Explain briefly full wave rectifier with positive half cycle circuit diagram. 4 20. Name any four parts of electric iron and write their functions. 2+2=4 21. Differentiate between electrical choke and electronic choke. Write two advantages of choke. 2+2=4 22. Write any four precautions to be taken while using induction cooker. 4 23. Explain in brief any four common barriers effecting communication. 4 ******************************************