Saturday, August 22, 2020

CBSE PORTAL : “CBSE Class-12 Exam 2020 : Question Paper (Electronics Technology)” plus 5 more

CBSE PORTAL : “CBSE Class-12 Exam 2020 : Question Paper (Electronics Technology)” plus 5 more

CBSE Class-12 Exam 2020 : Question Paper (Electronics Technology)

Posted: 22 Aug 2020 04:59 AM PDT

CBSE Class-12 Exam 2020 : Question Paper (Electronics Technology)

  • Subject :-Electronics Technology
  • Class : XII
  • Year : 2020

SECTION A

Employability Skills

 Answer any 4 questions out of the given 6 questions of 1 mark each. 1x4=4

1. What is article writing ? 1
2. How do expensive thoughts motivate us ? 1
3. What do you mean by paranoid ? 1
4. What do you mean by greenhouse emission ? 1
5. What is self-awareness ? 1
6. What do you mean by a Presentation in Presentation Software ? 1

 Answer any 3 questions out of the given 5 questions of 2 marks each. 2x3=6

7. What are the tips to become an active listener ? 2
8. What are the sources of inspiration ? 2
9. How are jobs increasing in green jobs industries ? 2
10. How can a student make himself better in a special class ? 2
11. How can you save a Presentation in a Presentation Software ? 2

SECTION B 

Subject Skills

 Answer any 10 questions out of the given 12 questions of 1 mark each. 1x10=10

 12. Which of the following microphones works on the principle of Faraday’s law ? 1
(A) Condenser
(B) Electret
(C) Moving Coil
(D) Carbon

 13. The material used for the magnet of moving coil loudspeaker is 1
(A) Steel alloy
(B) Soft iron
(C) Hard steel
(D) Alnico

 14. A horn is used in a loudspeaker 1
(A) To improve its impedance
(B) To improve the high frequency response
(C) For better coupling of sound into air
(D) All of the above 

 15. Horn type loudspeaker is the obvious choice for public address in a large open area. 1

(A) True
(B) False
16. The storage capacity of a CD is 1
(A) 360 KB
(B) 700 MB
(C) 540 KB
(D) 540 MB

17. The thickness of a CD is 1
(A) 1·4 mm
(B) 0·6 mm
(C) 0·8 mm
(D) 1·2 mm

18. Biasing would not be required if B-H curve were linear. 1
(A) True
(B) False

19. A TV Remote Control works on the principle of 1
(A) Pulse code modulated ultraviolet light
(B) Demodulation
(C) Pulse code modulated infrared light
(D) Either (A) or (B)

20. What is the full form of NTSC ? 1
21. A photosensitive drum is used in a _________. 1
22. As compared to other audio storage media, a compact disc has lower signal-to-noise ratio. 1
(A) True
(B) False

23. DVD stands for _________. 1

Answer any 5 questions from the given 7 questions of 2 marks each. 2x5=10

24. Write a short note on woofer. 2
25. Write advantages and disadvantages of capacitance microphone. 2
26. Why is ADC used in CD Recording system ? 2
27. Explain the function of a Keyed AGC in a TV Receiver. 2
28. Write advantages of LED TV. 2
29. Write any two possible problems which occur in Head-end Subsection. 2
30. What do you understand by DTMF and where is it used ? 2

Answer any 5 questions from the given 7 questions of 3 marks each. 3x5=15

31. Explain different kinds of hazards in industries. 3
32. What is a Compact Disc ? Write its advantages and disadvantages. 3
33. Discuss the working principle of a Tape recorder. 3
34. Explain the working principle of a Remote Control of a TV Receiver. 3
35. Write general causes of failure of a TV Receiver. 3
36. What do you understand by brightness, contrast, and luminance ? 3
37. Write some possible faults of a Printer and their solutions. 3

Answer any 3 questions from the given 5 questions of 5 marks each. 5x3=15

38. Write a note on provisions and benefits of safety. 5
39. Explain the construction, working principle and applications of a moving coil loudspeaker. 5
40. What do you understand by Analog Sound recording and Digital Sound recording ? Explain with block diagram. 5
41. Explain the working of a fax machine with the help of a block diagram. 5
42. With the help of a block diagram, explain the working of a TV Receiver. 5

 

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CBSE Board Class-XII
CBSE Board Papers
सीबीएसई बोर्ड कक्षा-12
सीबीएसई बोर्ड पेपर
Papers
Electronics
Class-12

CBSE Class-10 Exam 2020 : Question Paper (Gujarati)

Posted: 22 Aug 2020 02:45 AM PDT

CBSE Class-10 Exam 2020 : Question Paper (Gujarati)

  • Subject : German
  • Time allowed : 3 hours
  • Maximum Marks : 80

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CBSE Board Class-X
CBSE Board Papers
सीबीएसई बोर्ड कक्षा-10
सीबीएसई बोर्ड पेपर
Papers
Gujarati
Class-10

CBSE Class-10 Exam 2020 : Question Paper (German)

Posted: 22 Aug 2020 02:35 AM PDT

CBSE Class-12 Exam 2020 : Question Paper (Electrical Technology)

Posted: 22 Aug 2020 01:27 AM PDT

CBSE Class-12 Exam 2020 : Question Paper (Electrical Technology)

  • Subject :-Electrical Technology
  • Class : XII
  • Year : 2020

SECTION A

Employability Skills

Answer any 4 questions out of the given 6 questions of 1 mark each. 1x4=4

1. My grandmother likes to _________ (hear/listen) to the radio. 1
2. Name any two factors which shape our personality. 1
3. How is music a source of motivation ? 1
4. What should we do to control pollution ? 1
5. What do you understand by the term ‘Debate’ ? 1
6. Where is menu bar located in an Openoffice impress window ? 1

Answer any 3 questions out of the given 5 questions of 2 marks each. 2x3=6

7. What are the tips to become an active listener ? 2
8. What are the sources of motivation ? 2
9. List some green jobs in the field of building construction. 2
10. How does a student develop in a special class ? 2
11. How can you close a presentation in a presentation software ? 2

SECTION B 

Subject Skills

Answer any 10 questions out of the given 12 questions of 1 mark each. 1x10=10

12. If power factor lags on a static load transformer then it 1
(A) Takes more current
(B) Takes less current
(C) Takes same current, less power
(D) Takes less current, more power

13. In an RLC circuit, the parallel voltages across resistance, capacitance and inductance are 80 volt, 100 volt and 160 volt respectively. What is the net voltage of the circuit ? 1
(A) 80 V
(B) 100 V
(C) 140 V
(D) 340 V

14. Which types of losses occur according to change in load ? 1
(A) Hysteresis
(B) Eddy
(C) Copper loss
(D) Core loss

15. Name of liquid used in breather of a transformer is 1
(A) Water
(B) Salt
(C) Mineral
(D) Silica gel

16. How will the speed control of a DC series motor be done ? 1
(A) Shunt field regulator
(B) Not with divider
(C) Reduction of flux
(D) Increase in armature resistance

17. What will be the rotor frequency when an induction motor is switched on ? 1
(A) 50 Hz
(B) Equal to supply frequency
(C) Equal to slip frequency
(D) 0

18. Which of the following motors has a high starting torque ? 1
(A) Universal motor
(B) Capacitor start motor
(C) Shaded pole motor
(D) All of the above

19. Which instrument works only on DC supply ? 1
(A) Moving iron type
(B) Moving coil type
(C) Permanent magnet type
(D) All of the above

20. Which is an integrated instrument in the following ? 1
(A) Voltmeter
(B) Wattmeter
(C) Energy meter
(D) Power factor meter

21. To handle heavy equipment, the following are used : 1
(A) Crane
(B) Chain
(C) Pulley
(D) All of the above

22. If the motor of a cooler fails to start, the cause may be : 1
(A) Open circuit in the cord
(B) No supply
(C) Open circuit in motor winding
(D) All of the above

23. Thermostat control is used in : 1
(A) Table heater
(B) Ordinary electric iron
(C) Automatic electric geyser
(D) All of the above

Answer any 5 questions from the given 7 questions of 2 marks each. 2x5=10

24. What do you mean by Lagging and Leading of power factor in an AC Circuit ? 2
25. What is a Transformer ? Explain its working principle in brief. 2
26. In which condition are some transformers connected in parallel ? 2
27. Write the names of any four AC single phase motors. 2
28. Write the working and use of thermostat. 2
29. What are the possible faults which occur in an Electric Geyser ? 2
30. Describe in brief the Schafer’s method used for artificial respiration. 2

Answer any 5 questions from the given 7 questions of 3 marks each. 3x5=15

31. Explain safety measures, precautions, and applications of transformer. 3
32. Explain the construction and working of a DC motor. 3
33. Why is a starter necessary to start a three-phase AC motor ? Explain briefly. 3
34. With a diagram, explain the working of shaded pole motor. 3
35. With a diagram, explain Digital Ammeter. 3
36. Describe the construction and working of an Electric mixer. 3
37. Explain the testing process of a defective immersion rod with its diagram. 3

Answer any 3 questions from the given 5 questions of 5 marks each. 5x3=15

38. With a diagram explain the construction and working of a direct online motor starter. 5
39. With a diagram explain the working of a single-phase induction type energy meter. 5
40. With the help of a diagram, explain the construction and working of a Room Cooler. 5
41. Write types and applications of different types of DC motors. 5
42. With the help of a diagram, explain the construction and working of an Electric Geyser. 

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CBSE Board Class-XII
CBSE Board Papers
सीबीएसई बोर्ड कक्षा-12
सीबीएसई बोर्ड पेपर
Papers
Electrical
Class-12

(Download) CBSE Class-12 Sample Paper 2019-20 : Auto Shop Repair And Practice

Posted: 21 Aug 2020 11:19 PM PDT

(Download) CBSE Class-12 Sample Paper 2019-20 : Auto Shop Repair And Practice

  • Class: XII
  • Auto Shop Repair And Practice-628
  • Sample Question Paper 2019-20

SECTION –A

Mark the correct answer (1mark each).

Answer any 10 questions out of the given 12 questions:

1. While studying the „service manual‟ which point should be read carefully?
a. Specific Warning
b. Specific tools and gauges
c. All instructions
d. All of above.

2. At the time of purchasing the vehicle the „Owner‟s manual‟ is given to each purchaser with the vehicle
a. on free of cost
b. by taking the printed price
c. by taking half price
d. by taking one fourth price

3 Nuts and bolts are
a. Temporary fasteners
b. Permanent fasteners
c. More effective fasteners
d. All above.

4 Which of the following is  not an Automobile fastener?
a.U-Bolt
b.Jam Nut
c.Track Rod
d.Tie Rod

5 A propeller shaft is tubular instead of solid because
a. it is more strong
b. a solid shaft is weaker
c. it has smaller sag
d. it resist to‟ wind- up‟

6 „Contact breaker points‟ are generally made of
a. Plastic
b. Steel
c. Copper
d. Tungsten

7 “Clutch facings” are usually attached to the plate by
a. Steel Rivets
b. Brass Rivets
c.Aluminium screws
d. Steel screws

8 If the reading of the specific gravity of electrolyte which is filled in the battery is shown by hydrometer as 1.280 then your:
a. Battery is full charged
b. Battery is ¾th part charged
c. Battery is full ½ th part charged
d. None of the above

9 In motor vehicle the “Gear Box” is provided:
a. In between clutch and propeller shaft
b. In between flywheel and clutch.
c. At the end of propeller shaft
d. None of above.

10 Automotive starting motors are
a. Series wound
b. Series –shunt wound
c. Shunt-wound
d. Both (a) and (b) above

11 What is full form of ECM
a. Engine control Module
b. Engine control mechanism
c. Engine control management
d. None of these

12 Which of the following is a satellite navigation system designed for use in automobiles.
a. Driver information system
b. automotive navigation system
c. automobile navigation system
d. None of these.

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CBSE (Class XII) Previous Year Papers Printed Books

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Courtesy: CBSE

CBSE Board Class-XII
सीबीएसई बोर्ड कक्षा-12
Sample Paper
Auto Shop Repair and Practice
Class-12

(Download) CBSE Class-10 Sample Paper And Marking Scheme 2019-20: (Beauty and Wellness)

Posted: 21 Aug 2020 11:17 PM PDT

(Download) CBSE Class-10 Sample Paper And Marking Scheme 2019-20:

(Beauty and Wellness)

(Beauty and Wellness)

  • Class X - 2019-20
  • BEAUTY AND WELLNESS (407)
  • Time: 2 Hours 
  • Max. Marks: 50


SECTION –A

Fill in the blanks 10X1=10

Answer any 10 questions out of the given 12 questions:
1. Normal skin has Ph of about __________.

2. Regular practice of __________ removes all minor deformities of back.

3. A regular intake of __________ is essential to maintain good health.

4. Most hair conditioners contain positively charged molecules called _________surfactants.

5. Violet color governs the ___________ chakra in the body. This color helps in decision making process.

6. ___________ Manicure is differentiated by regular manicure due to different way of application of nail paint.

7. The word manicure is derived from _________ word “manus”.

8. ___________are placed on the nail into wet polish.

9. To attach a nail__________, a hole is drilled in nail art.

10. __________ is made from tiny strips of foils that are available in many colors.

11. Cobra pose is also known as ____________.

12. Before applying nail paint, place the _________________ between the toes.

VERY SHORT ANSWER (attempt any five) 5X2=10

13. Define paraffin manicure.
14. What is the definition of nutrition?
15. List contraindications of pedicure.
16. List the types of skin. Write the characteristics for oily skin type.
17. Why conditioner is used after shampooing the hair?
18. List any four benefits of henna application on head.
19. What is nail art?

SHORT ANSWERS (attempt any five) 5X3=15

20. Write down the career options in Beauty and Wellness industry.
21. Explain massage movements used in pedicure.
22. Describe in detail about Hydro therapy.
23. Explain the techniques used for sterilization.
24. Describe any 3 tools used in hair cutting.
25. Write down the various safety in hair cutting.
26. Briefly explain the procedure of powder bleach.

SECTION-B

LONG ANSWERS (attempt any three) 3X5=15

27. Elaborate the eight limbs of Ashtangyog. Explain the procedure of performing Netra shakti vikasak in detail.

28. What are conditioners? Describe any five types of conditioners.

29. Differentiate between Epilation and Depilation. Explain the procedure of waxing in detail.

30. Explain the preparation and procedure of pedicure in detail.

31. Define facial. Explain the procedure of plain facial.

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CBSE (Class X) Previous Year Papers Printed Books

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COUTESY : CBSE

CBSE Board Class-X
सीबीएसई बोर्ड कक्षा-10
Sample Paper
Class-10
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