Physics – Important Question Bank for Kerala Board (+2) HSE (HSC) Board Exam 2017

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Kerala Physics Question Paper

1. The line spectrum of hydrogen was successfully explained by Bohr

a) What are the postulates of the above model?

b) Write the expression for energy and radius of orbit

c) Find the longest wavelength in Lyman series and radius of second energy level

Q2. Electromagnetic spectrum consists of γ rays, X-rays, UV, Visible, IR, Microwaves and Radio waves

a) What is the phase difference between electric and magnetic field vectors in EM wave?

b) Which constituent radiation of the spectrum is mainly involved in

i) Greenhouse effect ii) Radar system iii) Distant photography during foggy condition

iv) Treatment of cancer

Q3. “Moving particles of matter shows wave like properties under suitable conditions”

a). Who put forward this hypothesis ?

b). Explain the experiment that provide this hypothesis

c) A proton and an electron have been accelerated through same potential. Which one has higher matter wave length. Write the reason

Q4. (a) Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater & greater magnifying power?

(b) Why must both objective and eyepiece of a compound microscope have short focal length?

(c) Draw the ray diagram for the image formation of a compound microscope

Q5. Identify the EM waves for the following

Satellite communication

Remote sensing

Sterilization

Cellular phone

Q6. A spherical shell of radius ‘R’ is uniformly charged to a surface change density

a) State the theorem which can be used to find the electric field outside the shell.

b) Using the theorem arrive at an expression for electric field at distance ‘r’ from the centre of the shell.

c) It is safe to be inside a vehicle rather than outside, when there is lightening. Comment on this.

Q7. Current carrying circular loop can be considered as a magnetic dipole.

a) Name the law used to find the magnetic field due to the above coil.

Derive the expression for the magnetic field at the centre of the circular coil.

8 . A LCR series circuit can be used as tuning circuits. using resonance condition.

a) Draw the corresponding phasor diagram.

b) Find the expression for resonant frequency.

c) The current passing through inductor or capacitor only circuit is called wattless current. Why?

Q9. a) which of the following phenomenon can’t be explained by wave theory of light?

i) Reflection ii) Refraction iii) Interference iv) Photoelectric effect.

b). In Young’s experiment, the distance between slit and screen (D) = 1m, the separation of slits (d) =1mm, wavelength of light (λ) = 600 nm. Calculate the fringe width (β)

c) If the experiment is done in water (n=4/3) without changing the setup, what change will be observed in fringe width? Why?

Q10. What is the effect on interference in Young’s double slit experiment due to the following operations.

(a) Source is replaced by another source of shorter wavelength.

(b) Separation between two slits is increased.

Q11. A freely suspended bar magnet aligned in north-south direction, i.e, north pole of magnet indicates north-ern side of earth.

a) What is the direction of earth’s magnetic field?

b) Explain three magnetic elements of earth.

c) Write any one of the causes of earth’s magnetism?

d)What in the alignment of a freely suspended magnet at geographic north pole of earth?

Q12. Young’s double slit experiment demonstrates the interference of light.

(a) Give the conditions to be satisfied for getting sustained interference pattern.

(b) Obtain the conditions for maxima and minima.

(c) What change would you expect in the fringe width if whole of the apparatus of Young’s double slit experiment is immersed in water? Justify.

Q13. .A lens forms image by refraction at its refracting faces. The refraction obeys the general equation

(-n1/u) + (n2/v) = (n2 – n1)/R (n2 > n1)

(a) An object ‘O’ be placed in front of a thin lens. Draw the ray diagram to locate the position of final image formed by it.

(b) Write down expression for refraction at both of its refracting faces and arrive at lens maker’s formula.

(c) Give a situation where a convex lens act as a concave lens.

Q14. De Broglie suggested that matter also possess dual nature like radiations. Einstein’s photon picture depicts the dual nature of radiations.

(a) What is the meaning of matter wave?

(b) Calculate the de Broglie wavelength of a body of mass 2 kg moving with a velocity 10 m/s.

Q15. One can determine the direction of electric field around a stationary charge with the help of field lines.

(a) What do you know understand by the term ‘electric flux’? Give its SI unit.

(b) State Gauss’s theorem in electrostatics and express it in mathematical form.

(c) Consider a spherical shell of radius ‘R’ is uniformly charged with charge ‘q’. By using Gauss’s theorem, find the electric field intensity at a point ‘p’.

(i) Outside this spherical shell

(ii) Inside this spherical shell

Q16. Define half-life period of a radioactive substance. Establish its relation with the decay constant?

(b) Deduce an expression for energy of an electron in an atom on the basis of Bohr atom model?

(c) Graphically represent the variation of Binding energy / Mass number with Mass number

16.  An inductor and capacitor are connected in series to an AC source I V = V0 sin ωt .

(a) Draw a circuit diagram of LC series circuit with applied AC voltage.

(b) Find the expression for impedance of LC series circuit using phasor diagram.

(c) Obtain the condition for resonance in the given circuit.

17.  If the wave length λ of special lines emitted by hydrogen atom is generally expressed as 1/λ = R[1/n₁²-1/n₂ ²] where R is the Rydberg constant and n₁ and n₂ are constants.

a) Write down the expression for Balmer series of spectral lines.

b) Find out the shortest wavelength of spectral line emitted in Balmer series?

18. A substance is weakly repelled by magnetic field

a) Identify the substance. Give example

b) How is its susceptibility dependent on temperature?

c) Why is iron core preferred in transformer core.

Q 19 An audio signal 10sin2π (1500t) amplitude modulates a carrier 40sin2π (100000t)

i) Sketch the AM Wave and what will be the percentage of modulation?

ii) Calculate the area of region covered by TV broadcast by a tower of height 200m. (Radius of earth R= 6.4×106 m)

20. A transistor in the common emitter mode can be used as an amplifier

a) Design a circuit to amplify an ac signal given in the input region

b) Derive expressions for voltage gain, current gain and power gain in the above transistor configuration.

c) “An oscillator is nothing but an amplifier” comment on the statement

Q21. (a) Pick the odd one out form the following (Amplitude modulation, frequency modulation, pulse width modulation, phase modulation)

(b) Draw the block diagram of a modulator for obtaining an AM           signal.

22. Arrange the following electromagnetic radiations in the ascending order of frequency. (Radio waves, X-rays, Infrared waves, Micro waves)
23. The south-pointing chariot was an ancient Chinese two-wheeled vehicle that carried a magnet to indicate the south direction, no matter how the chariot turned.

(a). State whether the following statement is true or false: “ The            unidirectional property of a pivoted magnet helps the south-          pointing chariot to indicate the south direction”

(b). The south-pointing chariot does not work at the magnetic south pole of the earth. Why?

24.  To investigate the inner structure of an atom, Rutherford proposed a series of experiments.

(a) What was the name of the experiment that leads to Rutherford’s nuclear model of atom?

(b) Give any two major observations in the above experiment.

25. (a) Identify the circuit diagram that represents the series combination of capacitors

(b) Derive an expression for the equivalent capacitance of the capacitors in (i) series and (ii) parallel combinations