Kerala SSLC Physics Board Model Paper March 2023 with Answers English Medium

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Kerala Syllabus Class 10 Physics Board Model Paper March 2023 with Answers English Medium

Time: 1½ Hours
Score: 40

Instructions:

• The first 15 minutes is cool-off time.
• You may use the time to read the questions and plan your answers.
• Answer only based on instructions and questions given.

Section – A

Answer any four questions. Each question carries 1 score.

Question 1.
Identify the relation from the first pair and complete the second pair suitably. (1)
Moving Coil Microphone: Sound Energy → Electrical Energy.
Power Generator: __________ → __________
Answer:
Power Generator: Mechanical Energy → Electrical Energy

Question 2.
Which of the following is related to green energy sources? (1)
(Atomic Reactor, Diesel Engine, Wind Mill, Thermal Power Station)
Answer:
Wind Mill

Question 3.
Which of the given statements is true? (1)
(a) Long-sightedness can be rectified by using the concave lens of suitable power.
(b) The near point of a person with Long-sightedness is more than 25 cm.
(c) The far point of a person with Near-sightedness is at infinity.
(d) Short-sightedness can be rectified by using a convex lens of suitable power.
Answer:
(b) The near point of a person with Long-sightedness is more than 25 cm.

Question 4.
Identify the mirror which always forms a virtual and diminished image. (1)
(Plane Mirror, Convex Mirror, Concave Mirror)
Answer:
Convex Mirror

Question 5.
According to New Cartesian Sign Conventions, a sign of the focal length of a concave lens is __________ (1)
Answer:
Negative

Section – B

Answer any four questions. Each question carries 2 scores.

Question 6.
Calculate the power of a heating appliance having 230 Ω resistance when 2 A current flows through it. (2)
Answer:
R = 230 Ω, I = 2 A
p = I²R
= 2² × 230
= 4 × 230
= 920 W

Question 7.
Observe the figure.

(a) Which part of this device converts electric energy into sound energy? (1)
(b) What is the working principle of this device? (1)
Answer:
(a) Voice Coil and Diaphragm.
(Voice coil converts electrical signal into mechanical energy, diaphragm converts it into sound energy)
(b) Motor Principle

Question 8.
A ray of light traveling from glass to air graces through the surface of the glass is shown in the figure.

(a) Name the angle of incidence (i) in the figure. (1)
(b) Can we reflect the incident ray into the glass? Justify your answer. (1)
Answer:
(a) Critical Angle
(b) Yes. Increase the angle of incidence, then the ray will undergo total internal reflection, i.e., the ray will be reflected to the same medium.

Question 9.
The angle between the reflecting surfaces of two plane mirrors is 30°.
(a) How many images are formed when an object is placed in between them? (1)
(b) Write any two characteristics of the image formed by a plane mirror. (1)
Answer:
(a) n = \(\frac{360}{\theta}\) – 1
= \(\frac{360}{30}\) – 1
= 12 – 1
= 11 images
(b) Virtual, Erect

Question 10.
The primary and secondary currents of a transformer are 2 A and 4 A respectively. The output voltage of this transformer is 100 V.
(a) Identify the transformer. (1)
(b) Calculate the primary voltage of the transformer. (1)
Answer:
(a) Step Down Transformer
(b) V_p × I_p = V_s × I_s
∴ V_p = \(\frac{\mathrm{V}_{\mathrm{S}} \times \mathrm{I}_{\mathrm{s}}}{\mathrm{I}_{\mathrm{P}}}\)
= \(\frac{100 \times 4}{2}\)
= 200 V

Section – C

Answer any four questions. Each question carries 3 scores.

Question 11.
The figure shows the dispersion of a ray of light passing through a water drop in the atmosphere.

(a) What are the phenomena of light that the ray undergoes inside the drop? (1)
(b) Identify and write down the colours P and Q. (1)
(c) What are the colours seen in the inner and outer edges of the primary rainbow? (1)
Answer:
(a) Dispersion, Internal Reflection and Refraction
(b) P – Violet, Q – Red
(c) Inner Edge – Violet and Outer Edge – Red

Question 12.
Fuse, MCB, ELCB, and RCCB are used to ensure safety in household electric circuits.
(a) What is the difference between the functioning of Fuse and MCB? (1)
(b) What is the advantage of MCB over Fuse? (1)
(c) What is the function of ELCB and RCCB in electric circuits? (1)
Answer:
(a) Fuse – In fuse, fuse wire melts due to excess current. It works based on the heating effect of electric current.
MCB – It has an internal switch that gets tripped when there is excess current. It works based on the magnetic effect and the heating effect of electrical energy.

(b) In MCB, after solving the problem, the switch can be turned on. But in the fuse, the melted fuse wire is to be replaced by another suitable wire. Moreover, MCB is more sensitive than fuse. MCB is simple to resume the supply.

(c) ELCB helps to break the circuit automatically when there is leakage of current due to insulation failure or short circuit, It protects the user from electric shock. RCCB also breaks the circuit, so that there is no harm due to electric shock. RCCB ensures more safety.

Question 13.
The conductor AB which is connected to a battery is placed between the poles of a U-shaped magnet perpendicular to the magnetic field lines.

(a) In which direction the conductor deflects when the circuit is switched on? (1)
(b) Which law helps to detect the direction of the conductor? State the law. (2)
Answer:
(a) P
(b) Fleming’s Left Hand Rule: Stretch the forefinger, middle finger, and thumb of the left hand in mutually perpendicular directions. The fore finger indicates the direction of the magnetic field, the middle finger indicates the direction of the current, then the thumb indicates the direction of motion of the conductor.

Question 14.
A branch circuit of a household electric circuit is shown in the figure.

(a) Find out any two mistakes in the circuit. (1)
(b) Draw the circuit correctly. (2)
Answer:
(a) (1) In the figure, the fuse is wrongly connected to the neutral wire. The fuse should be connected to the phase line.
(2) The large pin of the pin plug is wrongly connected to P in the figure. It should be connected to E, earth.
(b)

Question 15.
A lighted candle is placed 20 cm away in front of a spherical mirror. A real and inverted image is formed at the same distance.
(a) Identify the mirror used for the experiment. (1)
(b) What is the focal length of the mirror? (1)
(c) Calculate the magnification. (1)
Answer:
(a) Concave Mirror
(b) 10 cm
(c) -1

Section – D

Answer any four questions. Each question carries 4 scores.

Question 16.
Observe the electric circuit in which 40 Ω and 60 Ω resistors are connected in parallel.

(a) Calculate the effective resistance. (1)
(b) What is the current flowing through a 40 Ω resistor? (1)
(c) What is the heat generated in a 60 Ω resistor if current flows through it in 2 minutes? (2)
Answer:

Question 17.
The cooking gas that we get in cylinders is LPG.
(a) What indicates the label ‘B 23′ in the LPG cylinder? (1)
(b) Which is the main constituent of LPG? (1)
(c) Which substance is added in LPG to detect the leakage of the cylinder? (1)
(d) What precautions are to be taken to avoid accidents due to LPG leakage? (1)
Answer:
(a) It means that the cylinder expires in June 2023.
(b) Butane
(c) 1. Turn off the main switch.
2. Close the regulator
3. Isolate the cylinder into an open space and cover it with a wet cloth.

Question 18.
The figure shows the image formation in the eye of a person. Observe the figure and answer the following.

(a) Where is the image formed? (1)
(in front of the retina, at the retina, behind the retina)
(b) Identify the defect of the eye shown in the figure. (1)
(c) What are the reasons for this defect? (1)
(d) How can we rectify this defect? (1)
Answer:
(a) Behind the retina
(b) Long-sightedness or hypermetropia
(c) Eyeball is shorter than normal, decreased power of the eye lens.
(d) Use a convex lens of suitable power.

Question 19.
A ray diagram related to image formation is given below.

(a) Copy and complete the diagram to show the image formation. (2)
(b) Write the characteristics of the image formed. (1)
(c) Magnification of the image is _________ (1)
(Greater than 1, 1, Less than 1)
Answer:
(a)

(b) Inverted, Real, Enlarged.
(c) Greater than 1.

Question 20.
Nowadays natural disasters occur frequently in Kerala. If the walls of our house are wet due to flooding the chance of getting electric shock is more.
(a) What are the precautions to be taken to avoid electric shock during these situations? (1)
(b) What is to be done at first when a person is getting electric shock? (1)
(c) What are the First aids to be given in the case of electric shock? (2)
Answer:
(a) 1. Do not operate electric switches with wet hands.
2. Wear rubber slippers while handling electric appliances.
(b) Disconnect the source of electricity.
(c) Increase the body temperature by massaging. Give artificial respiration, and shift to the hospital immediately.