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Kerala Syllabus Class 10 Physics Question 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.
Find the relation between the terms in the first pair and complete the second pair. (1)
Incandescent lamp: Tungsten
Heating coil of heating appliances: ____________
Answer:
Nichrome
Question 2.
The secondary coil of a transformer has double turns than its primary coil. If the voltage applied in the primary coil is 25 V, what will the voltage be in the secondary? (1)
(25 V, 50 V, 2 V, 12.5 V)
Answer:
50 V
Question 3.
The midpoint of a lens is known as ___________ (1)
(Optic center, Principal focus, Centre of curvature, Principal axis)
Answer:
Optic Centre
Question 4.
If one Joule of work is done to move one coulomb of charge from one point to another. What will be the potential difference between these points? (1)
(2V, 3V, 1V, 4V)
Answer:
1 V
Question 5.
Which arrangement converts the AC induced in the armature of the DC generator into DC? (1)
Answer:
Splitting Commutator
Question 6.
When light passes through a medium it suffers partial and irregular reflection by hitting the particles of the medium. Name this phenomenon. (1)
Answer:
Scattering
B. Answer all questions from 7 to 9. Each carries 1 score. (3 × 1 = 3)
Question 7.
Which is the commercial unit of electrical energy? (1)
(ampere, kilowatt, kilowatt hour, volt)
Answer:
Kilowatt-hour
Question 8.
Which rule helps us to find the direction of motion of a current-carrying conductor placed in a magnetic field? (1)
(Joule’s law, Maxwell’s right-hand thumb rule, Fleming’s left-hand rule, Fleming’s right-hand rule)
Answer:
Fleming’s left-hand rule
Question 9.
The figure shows a beam of light falling on two different surfaces. (1)
Which type of reflection is represented by Figure 1?
Answer:
Regular Reflection
Part – II
A. Answer the following question carries 2 scores. (1 × 2 = 2)
Question 10.
When an object is placed in front of a concave mirror at a distance of 60 cm. An image is obtained on a screen at a distance of 30 cm from the mirror. Find the focal length of the mirror. (2)
Answer:
B. Answer any one question from 11 to 12. (1 × 2 = 2)
Question 11.
Write any two precautions to be taken to avoid electric shock. (2)
Answer:
- Never handle electric equipment or operate switches when the hands are wet.
- Do not fly kites near electric lines.
Question 12.
Why does Newton’s colour disc appear to be white, when it is rotated at high speed? Explain. (2)
Answer:
Due to the persistence of vision, the disc appears white. All the rays of light from the seven colors reach the retina of the eye within 1/16th of a second.
Part – III
A. Answer any three questions from 13 to 16. Each’ carries 3 scores. (3 × 3 = 9)
Question 13.
The figure given below shows the dispersion of white light when it passes through a prism.
(a) Which colour deviates more? (1)
(b) Which colour of visible light has the longest wavelength? (1)
(c) During dispersion each colour has got different deviations. Why? (1)
Answer:
(a) Violet/V
(b) Red/R
(c) Colours differ in their wavelength. The extent of deviation depends on the wavelength.
Question 14.
(a) What is the energy transformation taking place in a moving coil loudspeaker? (1)
(b) Explain the working of a moving coil loudspeaker. (2)
Answer:
(a) Electrical Energy → Sound Energy/Mechanical Energy
(b) The electrical pulses from a microphone are strengthened using an amplifier and sent through the voice coil of a loudspeaker. The voice coil, which is placed in the magnetic field, moves to and fro rapidly, by the electrical pulses. These movements make the diaphragm vibrate, thereby reproducing sound.
Question 15.
Some characteristics of step-up transformers and step-down transformers are given below. Select the statements suitable for step-up transformers. (3)
(a) Primary voltage is greater than secondary voltage.
(b) Secondary voltage is greater than primary voltage.
(c) The current in the primary coil is greater than that in the secondary coil.
(d) The current in the secondary coil is greater than that in the secondary toil.
(e) Thick wires are used in the primary.
(f) Thick wires are used in the secondary.
Answer:
(b) Secondary voltage is greater than primary voltage.
(c) The current in the primary coil is greater than that in the secondary coil.
(e) Thick wires are used in the primary.
Question 16.
When an object of height 5 cm is placed at a distance of 12 cm in front of a concave mirror, a real image is formed at a distance of 24 cm.
(a) Calculate magnification (Use New Cartesian Sign Convention) (1)
(b) Find the height of the image. (1)
(c) Based on magnification how can we predict whether the image formed is erect or inverted? (1)
Answer:
(c) Since magnification is -ve, the image is inverted.
B. Answer the following question carries a 3 score. (1 × 3 = 3)
Question 17.
(a) Which among the following is not a discharge lamp? (1)
(Sodium Vapour lamp, Arc lamp, Fluorescent lamp, LED lamp)
(b) Explain the working of the discharge lamp. (2)
Answer:
(a) LED lamp.
(b) When a high potential difference is applied the gas molecules get excited. Excited atoms come back to their original states to attain stability. During this process, the energy stored in them will be radiated as light.
Part – IV
A. Answer any 2 questions from 18 to 20. Each carries 4 scores. (2 × 4 = 8)
Question 18.
A schematic diagram of a generator is given:
(a) Which type of generator is this? (AC/DC) (1)
(b) Name the parts of this generator marked as 1, 2, 3, 4. (2)
1. __________________
2. __________________
3. __________________
4. __________________
(c) State the working principle of this device.
Answer:
(a) AC
(b) 1. Field magnet
2. Armature
3. Slip rings
4. Brush
(c) Electromagnetic induction: Whenever there is a change in the magnetic flux linked with a coil, an emf is induced in the coil. This phenomenon is electromagnetic induction.
Question 19.
Analyze the figure.
An object is placed between F and 2F of a convex lens.
(a) Copy the diagram and complete to show the image formation. (2)
(b) Where must the object be placed to get a real image of the same size as that of the object? (1)
Answer:
(b) Inverted, Real
(c) At 2F
Question 20.
(a) What is meant by the term ‘energy crisis? (2)
(b) Write any two reasons for the energy crisis. Suggest two methods to minimize it. (2)
Answer:
(a) The energy crisis is the consequence of increasing demand but decreasing availability.
(b) Reasons for energy crisis:
- Increased population.
- Industrialization.
Methods to minimize energy crisis:
- Judicious utilization of energy.
- Making use of public transportation as far as possible.
B. Answer any one question from 21 to 22. Each question carries 4 scores. (1 × 4 = 4)
Question 21.
An incandescent lamp bears the marking 200V, 100W.
(a) What does 100 W indicate? (1)
(b) What is the resistance of its filament? (2)
(c) Write an advantage of LED lamps over incandescent lamps. (1)
Answer:
(a) When 200 V potential difference is applied, then the power will be 100 W.
(c) As there is no filament, there is no loss of energy in the form of heat.
Question 22.
Observe the circuit of household electrification.
(a) Which device is used to measure the electrical energy consumed in household circuits? (1)
(b) Write any two advantages of connecting the devices in parallel in a household circuit. (2)
(c) Write the function of ELCB. (1)
Answer:
(a) Watt-hour meter.
(b) Devices work according to the marked power.
Devices can be controlled using switches as needed.
(c) ELCB helps to break the circuit automatically whenever there is a current leak due to insulation failure or other reasons.
Part – V
A. Answer any one question from 23 to 24. Each carries 5 scores. (1 × 5 = 5)
Question 23.
Light rays entering into the air from glass are depicted below. Observe the figures and answer the given questions.
(a) What is the critical angle of glass here? (1)
(b) Which figure represents total internal reflection? (1)
(c) Explain total internal reflection. (2)
(d) Write any two instances that make use of total internal reflection. (1)
Answer:
(a) 42°
(b) c
(c) When a ray of light passes from a medium of higher optical density to a medium of lower optical density at an angle of incidence greater than the critical angle, the ray is reflected to the same medium without undergoing refraction. This phenomenon is known as total internal reflection.
(d) Medical field – Endoscope
In the field of telecommunications – optical fiber cables.
Question 24.
Observe the given circuits.
(a) Calculate the resultant resistance in Circuit (A) and Circuit (B). (2)
(b) What is the intensity of electric current in Circuit (A)? (1)
(c) Calculate the heat energy produced in Circuit (B) if current flows for 30 minutes. (2)
Answer:
