NBSE Class 9 Question Paper 2019 Electronics and Hardware

Total number of printed pages : 2 NB-N/E&H(V) 2019 CLASS - IX 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 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=1 i. What is the unit of current? (a) Watt (b) Volt (c) Ampere (d) Ohm ii. Watt meter is an instrument to measure (a) Electric Voltage (b) Electric Current (c) Electric Energy (d) Electric power iii. The circuit in which current flows through vacuum, gas or semiconductor is called as (a) transistor (b) electronic circuit (c) transformer (d) capacitor iv. Which of the following is not a specification of transformer? (a) Circuit (b) Frequency (c) Voltage (d) Ampere v. The head of a hammer is made of (a) steel (b) silicon steel (c) cast steel (d) iron vi. How is Ammeter connected in the circuit? (a) In parallel (b) In series (c) At two terminals (d) At single terminal vii. Which of the following method is used when the information is received from the sender through a letter? (a) Listening (b) Reading (c) Speaking (d) Writing viii. Grooming is associated with (a) neat and clean appearance (b) self management (c) understanding self (d) confidence building ix. It is a short range wireless communication technology. (a) GPS (b) Wi-Fi (c) Internet (d) Bluetooth x. Which of the following is an example of renewable resources? (a) Coal (b) Petroleum (c) Solar energy (d) Fossil fuels

-2- NB-N/E&H(V) Answer the following questions in one word or one sentence: 2. Write any two non conventional methods of electricity generation. 1 3. What is electric current? 1 4. What type of switch is used in bathrooms? 1 5. What is a capacitor? 1 6. What does LED stand for? 1 7. Name any two parts of a transistor. 1 8. Mention any two types of electrical measuring instruments. 1 9. Write any two types of hammer. 1 Answer the following questions in 20-50 words: 10. Mention any two instruments for measurement of electrical quantities and write their symbols. 1+1=2 11. What is Diac? Write any one application of Diac. 1+1=2 12. If 10 Ω resistance ‘R’ is connected to 20 volt supply ‘V’, find the value of current ‘I’. 2 13. Find the equivalent resistance, if two resistance of 50 Ω each are connected in parallel. 2 14. Distinguish between step-up and step-down transformer. 2 15. What is Neon Tester? Write one use of Neon Tester. 1+1=2 16. Mention any two benefits of entrepreneurship. 2 17. Write any two advantages of digital meter. 2 Answer any four from the following questions in 60-100 words: 18. Explain any four sources of electricity. 4 19. Explain a series circuit with the help of a diagram. 2+2=4 20. What is a transformer? Explain briefly the construction of a transformer. 1+3= 4 21. What is resistor? State any three functions of a resistor. 1+3=4 22. Write four applications and two advantages of multimeter. 4 23. Explain any four self management skills. 4 **************************************