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Kerala Syllabus Class 10 Physics Board Model Paper March 2022 with Answers English Medium
Time: 1½ Hours
Score: 40
Instructions:
- There is a ‘Cool-off time’ of 15 minutes in addition to the writing time. Use this time to get familiar with questions and to plan your answer.
- Questions with different scores are given as distinct parts.
- Read the instructions carefully before answering the questions.
- Keep in mind, the score and time while answering the questions.
- The maximum score for questions from 1 to 24 will be 40.
Part – I
A. Answer any four questions from 1 to 6. Each carries 1 score. (4 × 1 = 4)
Question 1.
Name the arrangement in a DC motor to sustain the rotation of the armature in one direction. (1)
Answer:
Split Ring Commutator
Question 2.
In the figure, a beam of light is incident on a surface and its reflection is depicted.
If the angle between them is 60° what will be the angle of incidence? (1)
Answer:
30°
Question 3.
If the intensity of the electric current in a circuit is doubled the heat energy developed in this circuit increases _________ times. (1)
(2, \(\frac{1}{2}\), 4, \(\frac{1}{4}\))
Answer:
4
Question 4.
Which among the following is the graphical representation of the output emf in a DC generator? (1)
Answer:
Question 5.
Which of the mirrors forms an image larger than the object? (1)
(Plane Mirror, Concave Mirror, Convex Mirror)
Answer:
Concave Mirror
Question 6.
In which condition do all the component colors of white light undergo the same scattering? (1)
Answer:
If the size of the particles is greater than the wavelength of light, the scattering is the same for all colours.
B. Answer all questions from 7 to 9. Each carries 1 score. (3 × 1 = 3)
Question 7.
Which of the following light sources does not contain mercury in it? (1)
(Fluorescent Lamp, LED, CFL)
Answer:
LED
Question 8.
Which rule gives the direction of current produced in a conductor when it moves perpendicular to a magnetic field? (1)
Answer:
Fleming’s Right Hand Rule
Question 9.
If two plane mirrors are placed at an angle of 60° between them what will be the number of images formed by them? (1)
Answer:
5
Part – II
A. Answer the following question carries a 2 score. (1 × 2 = 2)
Question 10.
Write any two characteristic properties of the material used as a heating coil in heating devices. (2)
Answer:
High Resistance, High Melting Point
B. Answer any one question from 11 to 12. (1 × 2 = 2)
Question 11.
How many units of energy will be consumed by a 100 W bulb in 30 days, if it works 10 hours every day? (2)
Answer:
Electrical Energy = \(\frac{\text { Power } \times \text { time in hour }}{1000}\)
= \(\frac{100 \times 10 \times 30}{1000}\)
= 30 kWh
= 30 unit
Question 12.
Explain how light energy is produced in discharge lamps. (2)
Answer:
When high potential difference is applied, the gas molecules get excited. Excited atoms come back to their orginal states for attaining stability. During this process, the energy stored in them will be radiated as light.
Part – III
A. Answer any three questions from 13 to 16. Each carries 3 scores. (3 × 3 = 9)
Question 13.
A real image is formed at a distance of 20 cm from a concave mirror when an object is placed at a distance of 30 cm from the mirror.
(a) Calculate the focal length of the mirror using the New Cartesian sign convention. (2)
(b) What will be the magnification of the image? (1)
Answer:
Question 14.
Solenoids are used to make electromagnets.
(a) If the direction of the DC through the solenoid at the end facing us is clockwise, which magnetic pole is developed at this end? (1)
(b) Suggest two methods to increase the magnetic field strength of a solenoid. (2)
Answer:
(a) South Pole
(b) Increase the number of turns.
Increase the intensity of the electric current.
Question 15.
Observe the figure of the microphone.
(a) Write the names of Part A and B of the moving coil microphone. (1)
A = ____________
B = ____________
(b) How do electrical signals by the sound are generated in the microphone? (2)
Answer:
(a) A = Diaphragm
B = Voice Coil
(b) The diaphragm vibrates when sound waves fall on it. Voice coil connected with the diaphragm. Vibrates in a strong magnetic field. As a result, electrical signals corresponding to the sound waves are generated in the voice coil.
Question 16.
Observe the given diagram.
(a) When a light ray enters the air from water the light ray ___________ (1)
[moves towards the normal/moves away from the normal]
(b) Name the phenomenon that caused the deviation of the light rays when entered into air from the water. (1)
(c) What happens to the speed of light when it enters from water to air? (1)
[Increase, Decrease, No change]
Answer:
(a) Bends away from the normal
(b) Refraction
(c) Increases
B. Answer the following question carries a 3 score. (1 × 3 = 3)
Question 17.
Observe the given figure.
(a) Bulb in which circuit will glow with low intensity? (1)
(b) Explain the reason for the decrease in the intensity of light in this bulb. (2)
Answer:
(a) b
(b) While AC passes through the coil, magnetic flux changes. So a back emf is induced in the same coil. Thus due to self-induction, effective, voltage decreases.
Part – IV
A. Answer any 2 questions from 18 to 20. Each carries 4 scores. (2 × 4 = 8)
Question 18.
Coal is divided into four categories, peat and lignite are two of them.
(a) Which are the other two? (1)
(b) On what basis does coal is categorized like this? (1)
(c) Which are the products obtained when coal is distilled in the absence of air? (2)
Answer:
(a) Anthracite, Bituminous Coal
(b) Based on Carbon Content
(c) Coke, Coal Tar, Coal Gas, Ammonia
Question 19.
Observe the position of the object OB placed in front of a convex lens.
(a) Draw the ray diagram of image formation and find the position of the image. (2)
(b) Write any two features of the image formed. (1)
(c) Calculate the power of a convex lens with a focal length of 50 cm. (1)
Answer:
Question 20.
Observe the figure in which image formation in an eye is given.
(a) Name the defect of this eye. (1)
(b) What is the reason for this defect? (2)
(c) Suggest a remedy for this. (1)
Answer:
(a) Near-sightedness or myopia
(b) Excessive curvature of the eye lens.
Elongation of eyeball.
(c) Use a concave lens of suitable focal length.
B. Answer any one question from 21 to 22 (1 × 4 = 4)
Question 21.
(a) Which material is used as filament in incandescent lamps? (1)
(b) What are the characteristic properties of the material used as a filament? (2)
(c) Why these lamps are filled with Nitrogen? (1)
Answer:
(a) Tungsten
(b) High Resistance.
High Melting Point.
Can be drawn into thin wires/with high ductility.
Can emit white light.
(c) To decrease vaporization.
Question 22.
(a) When a beam of light entered into glass from the air it was found the angle of incidence was ‘i’ and the angle of refraction as ‘r’ state Snells’ law which relates these angles. (2)
(b) Calculate the refractive index when the light enters into glass from the air, if the velocity of light in air is 3 × 108 m/s and the velocity of light in glass is 2 × 108 m/s. (2)
Answer:
(a) The ratio of the sine of the angle of incidence to the sine of the angle of refraction \(\left(\frac{\sin i}{\sin r}\right)\) will always be a constant.
(b) Refractive index \(=\frac{\text { speed of light in air }}{\text { speed of high in the medium }}\)
= \(\frac{c}{v}\)
= \(\frac{3 \times 10^8}{2 \times 10^8}\)
= 1.5
Part – V
A. Answer anyone from 23 to 24. Each carries 5 scores. (1 × 5 = 5)
Question 23.
The following figure represents a transformer with no power loss.
(a) What type of transformer is shown in the figure? (1)
(b) Name the principle based on which this trans-former works. (1)
(c) If the output from the secondary of this transformer is 50 V, 10 W electric power.
(i) What will be the input voltage? (2)
(ii) What is the current in the primary? (1)
Answer:
(a) Step Down Transformer
(b) Mutual Induction
(c) (i) 200 V
(ii) P = I × V
∴ I = \(\frac{P}{V}\)
= \(\frac{10}{200}\)
= 0.05 A
Question 24.
Usually, we connect resistors in series and parallel.
(a) In which type of connection does the resultant resistance of the circuit decreases? (1)
(b) Two resistors of 100 Ω are connected in series with a 250 V supply. Calculate the heat energy produced when current flows through it for 2 seconds. (2)
(c) State whether the quantity of heat produced increases or decreases, if these resistors are connected in parallel in the same circuit with a 250 V supply. Justify your answer. (2)
Answer:
(a) Series Connection
(b) R = R1 + R2
= 100 + 100
= 200 Ω
V = 250 V, t = 2s
H = \(\frac{V^2 t}{R}\)
= \(\frac{250 \times 250 \times 2}{200}\)
= 625 J
(c) Increases, effective resistance decreases in parallel connection, so current increases, heat increases. (H = I2Rt)