Kerala SSLC Physics Board Model Paper March 2024 with Answers English Medium

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Kerala Syllabus Class 10 Physics Board Model Paper March 2024 with Answers English Medium

Time: 1½ Hours
Total 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.
• Consider score and time while answering.

Section – A

Answer any four questions. Each question carries 1 score. (4 × 1 = 4)

Question 1.
Find the relation in the first pair and complete the second. (1)
(i) Electric iron: Heating effect
(ii) Electric motor: ______________
Answer:
(i) Electric iron: Heating effect
(ii) Electric motor: Magnetic effect

Question 2.
Which of the following is not a part of a moving coil loudspeaker? (1)
(Voice Coil, Diaphragm, Permanent Magnet, Slip Rings)
Answer:
Slip Rings

Question 3.
Find the angle of incidence in the following figure. (1)

Answer:
50°
The angle between the incident ray and the reflected ray is 100°.
Since ∠i = ∠r
∠i = \(\frac{100}{2}\) = 50°

Question 4.
What is the energy conversion taking place in a windmill? (1)
Answer:
Wind Energy → Mechanical Energy → Electrical Energy

Question 5.
How long does an electrical device of power 500 W work to consume 1 unit of electrical energy? (1)
Answer:
Energy in kilowatt hour = \(\frac{\text { Power in watt } \times \text { time in hour }}{1000}\)
Energy = 1 unit
Power = 500 W
Time = \(\frac{\text { Energy } \times 1000}{\text { Power }}=\frac{1 \times 1000}{500}\)
Time = 2 hours

Section – B

Answer any four questions. Each question carries 2 scores. (4 × 2 = 8)

Question 6.
Write any four methods to minimize the energy crisis. (2)
Answer:

• Use energy judiciously.
• Use renewable sources of energy like solar energy maximum as possible.
• Construct houses to get sufficient sunlight and air circulation.
• Use machines haying high efficiency.

Question 7.
A soldering iron of resistance 1250 Ω works with a supply of 200 V.
(a) Find the power of the soldering iron. (1)
(b) Calculate the amount of heat energy produced in 10s. (1)
Answer:
(a) Power, P = V²/R
= 200²/1250
= 32 W
(b) Heat energy, H = Pt
= 32 × 10
= 320 J

Question 8.
Classify the energy produced from the following sources as green energy and brown energy. (2)
(Solar Power Plant, Atomic Reactor, Diesel Engine, Hydroelectric Power Station)
Answer:

Green Energy	Brown Energy
Solar Power Plant	Atomic Reactor
Hydroelectric Power Station	Diesel Engine

Question 9.
Analyze the following figure and answer the questions.

(a) Which medium has more optical density? (1)
(b) Calculate the speed of light in water if the refractive index of water is 1.33. (Speed of light in air = 3 × 10⁸ m/s) (1)
Answer:
(a) Water
(b) Speed of light in water = \(\frac{\text { speed of light in air }}{\text { refractive index of water }}=\frac{3 \times 10^8}{1.33}\) = 2.25 × 10⁸ m/s

Question 10.
Analyze the following statements and correct the mistakes if any:
(a) According to the new Cartesian sign convention the distance of the object from a mirror is always positive. (1)
(b) Fleming’s left-hand rule helps to identify the direction of the magnetic field around a current-carrying conductor. (1)
Answer:
(a) False.
According to the New Cartesian Sign convention, the distance of the object from a mirror is always negative.
(b) False.
The Right-hand thumb rule is used to identify the direction of the magnetic field around a current-carrying conductor.
OR
Fleming’s left-hand rule is used to identify the direction of magnetic force on a current-carrying conductor placed in a magnetic field.

Section – C

Answer any four questions. Each question carries 3 scores. (4 × 3 = 12)

Question 11.
Analyze the following circuits:

(a) In which circuit the bulbs are connected in parallel? (1)
(b) The bulbs in which the circuit glows brighter when all the switches are put on? (1)
(c) Justify your answer. (1)
Answer:
(a) Circuit A
(b) Circuit A
(c) In a parallel connection, the source voltage is fully available at both lamps whereas in a series connection, the applied voltage is split between the lamps.

Question 12.
Match the following.

A	B	C
Plane Mirror	Rear View Mirror	Magnification is more
Convex Mirror	Shaving Mirror	The size of the image is the same as that of the object.
Concave Mirror	Periscope	Larger field of view

Answer:

A	B	C
Plane Mirror	Periscope	The size of the image is the same as that of the size of the object.
Convex Mirror	Rearview Mirror	Larger field of view
Concave Mirror	Shaving Mirror	Magnification is more

Question 13.
A ray diagram of the image formation in the human eye is depicted. Analyze the figure and answer the questions.

(a) Which figure indicates an eye with short-sightedness? (1)
(b) What are the reasons for this defect? (1)
(c) How is it rectified? (1)
Answer:
(a) Figure B
(b) Reasons for the defect:

• The eyeball is larger than the normal size.
• The focal length of the eye lens is shorter than the required focal length.

(c) By using the concave lens of suitable power.

Question 14.
Two magnets and a current-carrying conductor AB are placed on the top of a table as shown in the figure.

(a) In which direction should the current flow through the conductor to move it in a direction upwards from the table? (1)
(b) Which rule helps you to find the answer? (1)
(c) Write any two devices that work on this principle. (1)
Answer:
(a) From A to B.
(b) Fleming’s left-hand rule.
(c) Electric motor, moving coil loudspeaker.

Question 15.
Analyze the following figure and answer the questions.

(a) Find the angle of refraction. (1)
(b) Write any angle of incidence that produces total internal reflection. (1)
(c) Write any two practical applications of total internal reflection. (1)
Answer:
(a) 90°
(b) 50° (Any angle larger than 42°)
(c) Optic fiber, Endoscope.

Section – D

Answer any four questions. Each question carries 4 scores. (4 × 4 = 16)

Question 16.
An electric circuit consisting of two incandescent lamps is depicted below. Analyze the circuit and answer the questions.

(a) Which material is used as filament in incandescent lamps? (1)
(b) Calculate the current through the circuit when S₁ and S₂ are put on. (2)
(c) What happens to the circuit when all the switches are put on? (1)
Answer:
(a) Tungsten
(b) When S₁ and S₂ are ON, the circuit becomes short-circuited, and the fuse wire will be burned out. (Question is wrong)
If S₂ and S₃ are on the current in the circuit
I = \(\frac{100}{200}+\frac{100}{200}\) = 1 A
(c) A short circuit will happen, and the fuse wire will be burned out.

Question 17.
A transformer without power loss works at an input of 250 V. A current of 1 A flows through the secondary coil when an electrical device of power 50 W is connected to the secondary.
(a) Which type of transformer is used here? (1)
(b) What is the working principle of a transformer? ( 1)
(c) Calculate the current through the primary. (1)
Answer:
(a) P_s = V_s × I_s
50 = V_s × 1
V_s = 50 V
Since V_s is less than V_p, it is a step-down transformer.
(b) Mutual Induction
(c) \(\frac{V_s}{V_p}=\frac{I_p}{I_s}\)
V_p = 250 V
I_s = 1 A
I_p = \(\frac{\mathrm{V}_{\mathrm{s}} \times \mathrm{I}_{\mathrm{s}}}{\mathrm{~V}_{\mathrm{p}}}=\frac{50 \times 1}{250}\) = 0.2 A

Question 18.
Analyze the following schematic diagram and answer the questions.

(a) Name the device. (1)
(b) Which are the main parts of this device? (2)
(c) Illustrate the graphic representation of the output when the field magnet is rotated by keeping the armature stationary. (1)
Answer:
(a) DC Generator.
(b) Armature, field magnet, split ring commutator, and brushes.
(c)

Question 19.
The following diagram represents the passage of light from an object through a lens MN.

(a) Which type of lens is MN? (1)
(b) Copy and redraw the diagram to get the image of the object. (2)
(c) Write any two characteristics of this image. (1)
Answer:
(a) Concave Lens
(b)

(c) Erect, Virtual, Smaller than the object.

Question 20.
Analyze the following figure and answer the questions.

(a) Which are the colours obtained on the screen? (1)
(b) Which among these has the longest wavelength? (1)
(c) Name the process by which light splits up into its constituent colours. (1)
(d) What difference is observed when red laser light is used instead of sunlight? (1)
Answer:
(a) Violet, Indigo, Blue, Green, Yellow, Orange, and Red. [All visible colours]
(b) Red
(c) Dispersion
(d) There is no dispersion. That is only red colour is obtained on the screen as it is composed of only one colour.