Karnataka SSLC Question Paper 2025 Answer Key Electronics and Hardware

Government of Karnataka
Karnataka Secondary Education Examination Board

Question Paper
ANSWER KEY

A
CCE RF
Revised Syllabus

NSQF LEVEL-2
KARNATAKA SCHOOL EXAMINATION AND ASSESSMENT BOARD,
MALLESHWARAM, BENGALURU – 560 003
NSQF LEVEL-2, MARCH/APRIL 2025 EXAMINATION-1
MODEL ANSWERS
Date : 04. 04. 2025 ] CODE NO. : 22-EK
Subject : ELECTRONICS & HARDWARE
( English Medium )
( Regular Fresh )
[ Max. Marks : 60
Qn.
Value Points Total

PART-A

I. Four alternatives are given for each of the following
questions / incomplete statements. Choose the
correct alternative and write the complete answer
along with its question number and alphabet :
3×1=3
1. "Sham bought a pen. He has a great pen collection".
The pronoun in this sentence is
(A) Sham (B) bought
(C) He (D) has
Ans. (C) He 1
2. Ravi works hard to get the best student award at the
end of year. What type of motivation is this ?
(A) Internal (B) External
(C) Emotional skill (D) Overconfidence
Ans. (B) External 1

CCE RF(A)/101/1876(MA) [ Turn over

22-EK (Level-2) 2
Qn.
Value Points Total

3. The valid file extension for notepad file is
(A) .jpg (B) .doc
(C) .text (D) .txt
Ans. (D) .txt 1
II. Answer the following questions : 2×1=2

4. Why is 'enter key' used in computer ?
It is one of the most important functional keys in the
computer to move the cursor to the beginning to a new
line.
In some programs, it is used to send commands and to
conform a test on a computer. 1
5. Write any two basic ways in which people can help for
sustainable development of goals.
i) Quality education
ii) Clean water and sanitation
½
iii) Affordable and clean energy
iv) Decent work and economic growth
½
v) Reduce inequalities. ( any two ) 1
III. Answer the following questions : 2×2=4

6. What is time management ?
Time management is the ability to plan and control,
how you spend the hours of your day well and do all
that you want to do. 2
OR

CCE RF(A)/101/1876(MA)

3 22-EK (Level-2)
Qn.
Value Points Total

How do you find your weakness ?

i) Point out the areas, where you struggle and the

things you find difficult to do.

ii) Look at the feedback others usually give you.
1
iii) Be open to feedback and accept your weakness

without feeling low about it. Take it as an area of
1
improvement. ( any two ) 2

7. Mention four qualities one should have to become a

successful entrepreneur.

i) He/she must believe in her/him-self. and He/she

should be confident and take business decisions.
½
ii) If the idea did not work but it is okay then keep
½
trying new ideas.
½
iii) Running his/her business is difficult, but he/she
½
is patient because He/she knows that success will

come soon.

iv) He/she a creative and different solution to the

problem that is why she/he successful. ( any four ) 2

CCE RF(A)/101/1876(MA) [ Turn over

22-EK (Level-2) 4
Qn.
Value Points Total
IV. Answer the following question : 1×3=3

8. Explain the meaning of verbal communication, its
advantages and disadvantages.
Verbal communication includes sounds, words,
language and speech. Speaking is one of the most 1
effective and commonly used ways of communicating.
It helps in expressing our emotions in words.
Advantages :
i) It is an easy mode of communication in which you 1
can exchanging ideas by saying what you want and
get a quick response.
ii) Verbal communication also enables you to keep
changing your interaction as per the other person's 1
response.
Disadvantages :
i) It depends on written or spoken words. Sometimes
the meaning can be confusing and difficult to
understand if the right words are not used. 3

PART-B

V. Four alternatives are given for each of the following
questions / incomplete statements. Choose the
correct alternative and write the complete answer
along with its question number and alphabet :
7×1=7

9. A passive electronic component in the following is
(A) Diode (B) Transistor
(C) Resistor (D) Integrated circuit
Ans. (C) Resistor 1

CCE RF(A)/101/1876(MA)

5 22-EK (Level-2)
Qn.
Value Points Total

10. Stabilizer is used for the purpose of
(A) Increasing the voltage only
(B) Decreasing the voltage only
(C) Bringing the voltage to zero
(D) Avoiding voltage fluctuation
Ans. (D) Avoiding voltage fluctuation 1

11. The alternate name of Reamer type Juicer is
(A) Manual Juicer (B) Cold Press Juicer
(C) Twin gear Juicer (D) Wine-press Juicer
Ans. (A) Manual Juicer 1

12. Slow movement of a rotating shaft is sensed by
(A) Blade (B) ZSS
(C) OLR (D) Multimeter
Ans. (B) ZSS 1

13. The part of microwave oven, which produces
microwaves is
(A) Grill (B) Stirrer fan
(C) Waveguide (D) Magnetron

Ans. (D) Magnetron 1

14. The part of the microwave oven that maintains the
temperature of the magnetron is
(A) Blower fan (B) Stirrer fan
(C) Diode (D) Transformer

Ans. (A) Blower fan 1

CCE RF(A)/101/1876(MA) [ Turn over

22-EK (Level-2) 6
Qn.
Value Points Total

15. A conducting material in the following is

(A) Glass (B) Silver

(C) Wood piece (D) Rubber

Ans. ( B ) Silver 1

VI. Fill in the blanks with suitable answer : 4×1=4

16. The type of cable used in the distant communication is

............. .

Optical fiber 1

17. In the microwave oven ............... part of the cooking

cavity shows the progress of the food that is being

cooked.

Cavity lamp 1

18. O.L.R. stands for ..................... .

Over Load Relay 1

19. Poor wiring system can cause ................. .

Overheating and fires 1
CCE RF(A)/101/1876(MA)

7 22-EK (Level-2)
Qn.
Value Points Total
VII. Mixer parts are given in Column-A and their
functions are given in Column-B. Match them and
write the answer with alphabet : 4×1=4
20. Column-A Column-B
i) Power cable a) Transfers rotating
movements to the Jar
ii) Speed setting b) Carries electrical power
switch to the mixer
iii) Power indicator c) A vessel which contains a
blade to grind the food
iv) Field and d) Varies the speed of mixer
armature
e) Indicates the availability
of mixer
f) Motor gives rotating
movement to the Jar
g) Grinds food items
Ans :
i) b) Carries electrical power to the mixer 1
ii) d) Varies the speed of mixer 1
iii) e) Indicates the availability of mixer 1
iv) f) Motor-gives rotating movement to the Jar 1 4
VIII. Answer the following questions : 4×1=4

21. Draw the diagram of Simplex Lap winding.

1

1

CCE RF(A)/101/1876(MA) [ Turn over

22-EK (Level-2) 8
Qn.
Value Points Total

22. What is a Juicer ?
A juicer is a juice extractor. It crushes, grinds, and
squeezes the juice out of the pulp. 1
23. What is solo microwave oven ?
Solo microwave oven is a model of Microwave oven used
for cooking and reheating. 1
24. Which part directs the production of microwaves in the
magnetron of a microwave oven ?
Waveguide 1
IX. Answer the following questions : 4×2=8
25.
Name any four types of circuit breakers.

i) Miniature case Circuit Breaker ( MCB ) ½
ii) Air blast circuit breaker ½
iii) Oil circuit breaker ½
iv) Sf 6 circuit breaker
½
v) Vacuum circuit breaker 2
26. Describe high voltage transformer in the microwave
oven.
High voltage transformer plays a major role in
Microwave oven :
 It supplies sufficient amount of energy to the
magnetron to generate the microwaves.
 Also drives the filament for the magnetron. 2
OR

CCE RF(A)/101/1876(MA)

9 22-EK (Level-2)
Qn.
Value Points Total

Mention the causes for the timing problem in
microwave oven.
i) Defect in control unit 1
ii) Defect in AH sensor. 1 2
27. A Microwave oven is working but food is not getting
heated up. Mention the reasons for this.
i) Shorted or open wiring
½
ii) Fault in magnet
½
iii) Power transformer problem
½
iv) Problem in H. V. capacitor
½
v) Fault in primary interlock system. ( any four ) 2

28. List the safety procedures to be followed during repair
of the electric devices.

i) Check whether the connection is in off state

ii) Cut off the power supply before changing the fuse

iii) Wear gloves & shoes

iv) Use the appropriate device for repairing
1
v) After repairing, close the appliances properly
before checking

vi) Keep the phones, first aid box & fire extinguisher
nearby

vii) There should be proper ventilation in the work
place 1 2

CCE RF(A)/101/1876(MA) [ Turn over

22-EK (Level-2) 10
Qn.
Value Points Total

X. Answer the following questions : 3×3=9

29. 'YOKE' is an important part in the motor. Justify.
i) Yoke of the motor is made up of cast iron or steel.
ii) It is an integrated part of the stator & static part
of motor
iii) It gives protective covering over the sophisticating
parts of the motor and provides support to the
armature. 3

30. Draw the diagram of mixer and label the parts.

1

1

½

½
3
31. List the 3 parts of the cooking cavity in the microwave
oven and explain their functions.
i) Cooking chamber : It is used to keep the output ½
radiation within the limit due to that the food gets
½
heated.
½
ii) Cavity Lamp : Used to show the progress of the
food that is being cooked in the Microwave oven. ½
iii) Turntable motor : It rotates the food so that the ½
heat is evenly spread. ½ 3
OR
CCE RF(A)/101/1876(MA)

11 22-EK (Level-2)
Qn.
Value Points Total

List the causes for the display problem in microwave
oven and explain them.
i) Defect in control unit :
This is mainly due to the disconnection of the
electronic components in the circuit board.
ii) Defect in temperature fuse :

Temperature fuse in a microwave oven can be
blown sometimes due to overheating or when the
temperature exceeds the actual rating of the
temperature.
iii) Defect in shorted or open wiring :

This is due to the fault in the shorted or open
wiring in the microwave oven. In such cases the
continuity of the wires needs to be checked by
using a digital multimeter.
iv) Defect in Monitor switch:

This may be due to the use of fault monitor
switch. In such cases the faulty monitor needs to
be replaced by a service technician. ( any 3 ) 3

XI. Answer the following questions : 3 × 4 = 12

32. Draw the diagram of Relay and label the following parts
:
i) Movable armature
ii) Static contact
iii) Electromagnet
iv) Spring

CCE RF(A)/101/1876(MA) [ Turn over

22-EK (Level-2) 12
Qn.
Value Points Total

4

33. List any four components of Juicer and explain about
each of them.

i) Motor : Motor is the machine which makes the
other juicer is parts to move to perform their
½
functions. It is powered by electricity to create
½
mechanical movements.
½
ii) Base housing : It is the body of the juicer.
½
iii) On/OFF Switch: It is used to turn On & Off the
juicer. It controls speed numbers. ½

iv) Power cord : It connects the juicer to a power ½

outlet. ½

v) Juice container : Juice container is the part ½

where finished product would go and it is ready
for drinking. ( Any four ) 4
OR

CCE RF(A)/101/1876(MA)

13 22-EK (Level-2)
Qn.
Value Points Total

List the factors confirming the proper functioning of
the repaired unit of the grinder.

i) Leaking mixer grinder :
Leaking proves to be one of the most ordinary
grinder problems. To correct it, you first need to
check the blade gathering and ensure that it is
tightly screwed onto the jar. Another reason for a
leaking mixer could be problem with the rubber
gasket. Leaking can also result due to a crack in 1½
the jar and in this case you may need to replace
the jar altogether.
ii) Struck buttons of the mixer grinder :

This generally happens when food & liquids leak
a little bit and enter the space in the buttons. To
correct this issue, you have to unplug the
appliance & give it a nice careful cleaning. 1
Take an old toothbrush for enhanced cleaning.

iii) Slow moving blades :

In this case the food & liquids take a long time to
get mixed or churned. In most of the cases. This
problem is caused due to food particles
bottleneck the blade gathering. We, just have to
disassemble the blade assembly & soak the parts
in soapy water which is slightly warm for another
half an hour. Scrub the parts properly and
1½
reassemble them all. 4

CCE RF(A)/101/1876(MA) [ Turn over

22-EK (Level-2) 14
Qn.
Value Points Total

34. Write the step by step assembling procedure of the
microwave oven.

Assembling procedure :
i) Make sure that all parts are neat and clean.
ii) Place the oven base at a flat surface.
iii) Place the required tools nearer to the work place.
iv) Before assembling check all the equipment are in
working condition.
v) Connect and check power supply circuit.
vi) Fix the cooking cavity in the base.
vii) Fix the control panel and verify its connection.
viii) Fix the blower fan, stirrer and grill in the
appropriate position.
ix) Fix the upper moulding cover.
x) Give the supply. Verify the operation of
Microwave oven. ( any 8 orderly ) 4
OR
List the cleaning and maintenance process of the
microwave oven.
i) Before cleaning check the supply is in off
condition.
ii) Do not use water/liquid cleaners
iii) Use soft sponge for cleaning the microwave oven
iv) Use baking soda & vinegar for complete cleaning.
v) Don't close the door too hard.
CCE RF(A)/101/1876(MA)

15 22-EK (Level-2)
Qn.
Value Points Total

vi) Use pot holders for handling containers that are
inside the microwave oven.
vii) Don't dry non-food items in the microwave oven
use longer.
viii) Repeat the process to maintain the microwave
oven use longer.
ix) Keep the inside of the oven clean.
x) Don't allow the control panel to become wet.
( any 8 orderly )

CCE RF(A)/101/1876(MA) [ Turn over

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