CHSE PHYSICS PREVIOUS YEAR QUESTIONS

 past 10 year+ question papers of COUNCIL OF HIGHER SECONDARY (CHSE) board odisha

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Some random Important short questions chapterwise

Electrostatics

1.Define dielectric constant of a medium in

terms of force between electric charges.

Ans. It is ratio of force between two charges when placed in vacuum to the force between the same two charges placed in a medium.

2 dielectric constant of medium increases how does the force between two point charges change.

Ans. Force decreases because Force is directly proportional to inverse of k

3.What kind of charges are produced on each when

(i) a glass rod is rubbed with silk

(ii) an ebonite rod is rubbed with wool

Ans. (i) Glass rod positive.

(ii) Ebonite > negative

4.Write two basic propertiesof electric charge.

Ans. (i) Charge is quantised.

ii) Charge is conserved.

5.Two point charges separated by distance 'd' in air experiences force F. If the system is shifted into water, what will be the magnitude of force?

Ans. In water the force reduces by 81 times.

Two equal +ve point charges placed near eachother. 

6.What is the net force on an electric dipole

placed in uniform electric field?

Ans. zero

7.Electric field intensity is not zero but electric potential is zero. Is it possible?

Ans. YES. AT a point on the equatorial line of an electric dipole.

8.If electric field intensity is zero then electric potential is necessarily zero. Explain.

Ans. No. If four equal and similar charges are placed at the corner of a square at its centre field is zero but potential is not zero.

9.Write two simillarities between electrostatic andgravitational force.

Ans. (i) Both are mutual force.

(ii) Both obey inverse square law.

10.Write two dissimilarities between electrostatic

and gravitational force.

Ans. (1) Electrostatic force is attractive as well as  repulsivebut gravitational force is always attractive.

(2) There is electrostatic screen but there is no gravity screen.

11.Write the limitations of CQulomb's law.

Ans. i) It is applicable for point charges.

(ii) It is applicable when two charges are at rest.

 Current Electricity

Find the mistake in the sentence if any 

1.The practical unit of resistivity is ohm-m.

Ans. ohm-cm

2.The unit of conductance is siemen.

Ans. Statement is correct.

3.S.I. unit of internal resistance of cell is ohm.

Ans. Statement is correct.

4.Those materials whose electrical conductivity is negligible are called conductors.

Ans. are called insulators

5. Drift velocity of free electrons is the order of cm/sec.

Ans. Statement is correct.

6.Current flowing through a conductor is inversely proportional to the drift velocity.

Ans. directly proportional

7. Mobility of free electron is drift velocity per unit  electricpotential.

Ans. per unit electric field intensity.

8. Current density is a microscopic entity.

Ans. Statement is correct.

9. Mobility varies directly to the drift velocity of electron.

Ans. Statement is correct.

10. The term emf is used for a source of voltage.

Ans. Statement is correct.

11.Kirchoff's 2nd law obeys law of conservation of charge.

Ans. law of conservation of energy

12. A current carrying conductor is charged always.

Ans. Not charged always because net charge

on the conductor is zero.

13. A low voltage supply should have high internal resistance.

Ans. Low internal resistance because current is maximum.

14. Bending wire affects its elęctrical resistance.

Ans. Does not affect its electrical resistance due to low inertia of motion.

15. Melting point of fuse wire is high and resIstanceis low.

Ans. Melting point of fuse wire is low and

resistance is high.

16. Power dissipation means the rate at which  electric energy is converted to heat energy.

Ans. Statement is correct.

Magnetic effect of current

1. What is the value of magnetic dip at the south magnetic pole of earth ? [2008(A), 2000 (B)]

Ans.90°.

2. Give one example each of dia and para magnetic substances

[2007(D), 1995 (A)]

Ans.Diamagnetic substance Copper, Antimony,Bismuth,Paramagnetic substance, Aluminium,Chromium, Manganese.

[2002 (A)]

3. Define magnetic permeability.

Ans.The magnetic permeability of a magnetic substance is defined as the ratio of magnetic induction to the magnetic intensity.

4. What will happen if a diamagnetic substance is suspended in an uniform magnetic field.

(2002 (1), 2000 (A)]

Ans.The diamagnetic substance will move from stronger part to weaker part of the field.

 5.Whats is the nature of force between two parallel currents?

Ans.The force between two parallel currentss is attractive when they are in same direction and repulsive when in opposite direction.

6.can you place a current carrying straignt

Wire in a uniform magnetic field so that it

experiences maximum deflecting force ?

2001 (A)

Ans.Perpendicular to the magnetic field.

7.Can a charged particle move through magnetic field without experiencing any force ? How ?

[2001 (1)

Ans.Yes, when the charged particle moves parallel to the field.

8.Why do magnetic lines of force pass through iron than through air ?

Ans. Because iron is a ferromagnetic substance and has large permeability.

9.What is angle of dip where the horizontal and vertical component's of earth magnetic field are equal ?

Ans. 8 = 45°

10.How does dip angle change as one moves from magnetic equator to the pole ?

Ans. It is zero at magnetic equator.

It is 90° at magnetic pole.

11.Where on the earth's surface is the value of angle of dip maximum?

Ans. It is maximum at magnetic pole (90°).

12.Give one example each of ferromagnetics,

paramagnetics, diamagnetics.

Ans. Ferromagnetic Iron

Paramagnetic - Platinum

Diamagnetic - Copper.

13.Define intensity of magnetisation.

Ans. It is defined as the magnetic moment developed per unit volume by magnetic material.

Optics 

1.In which way Refractive index of a medium varies with wavelength of light ?

Ans. Inversely

2.What is relation between u and sin C ?

Ans.u= 1/sin C

 3.Which colour is scattered more ?

Ans. Blue

4.What is nature of wave front of a point source ?

Ans. spherical

5.During refraction which property of light remains constant?

Ans. Frequency

6.what is a polaroid ?

Ans. A polaroid is a thin commercial sheet which makes use of the property of selective absorption to produce an intense beam of plane polarised light.

7.The distance between pole and focus is called what ?

Ans. focal length

8.Speed of light is always less than which value ?

Ans. 3 x 10 m/sec

9. Mirage and optical fibre works on which principle ?

Ans. Total internal reflection

10. Twinkling of star is due to which process?

Ans. Refraction

11.Sun glasses are made of polaroids and not of coloured glasses. Why ?

Ans. Polaroids absorb only that part of light which produces dazzling effect in the eye. But coloured glasses absorb more light incident on them and so the image appears dim.

12.Which mirror is used in automobiles for rear view?

Ans. Convex mirror

13.An air bubble inside water behaves like which lens?

Ans. Concave lens

14.Interference work's on which principle ?

Ans. Conservation of energy

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