11th Physics Chapter No. 9 to 11 MCQ, Short and Long Questions

11th Physics Chapter No. 9 to 11

Students of F.sc can read for online preparation of 11th Physics chapter No.9 test with important MCQ, Short questions and Long questions.

11th Physics Important Questions

Here you will find all important short and long questions from 11th Physics Chapter No. 9 to 11. All these questions are collected from past papers of F.sc annual examination 2019.

11th Physics MCQs Unit No.9 & 11

v  Concept that “Life is a type of wave” may be confirmed by the phenomena of

(a) diffraction      (b) polarization          

(c) interference    (d) All above

v  Light travels perpendicular to electric and magnetic fields and require no material medium, was proposed by

(a) Einstein            (b) Max Plank             

(c) Bragg               (d) Maxwell

v  Sunlight reaches earth nearly in the form of

(a) plane wave fronts   (b) Circular wave fronts

(c) spherical wave fronts  (d) All above

v  Huygen’s principle is used to explain the

(a) speed of light   (b) dispersion of light             

(c) propagation of light (d) Reflection of light

v  The phenomenon of polarization is done by

(a) selective reflection    (b) refraction through crystal     

(c) Scattering through particles  (d) All of above

v  Polarizer are made by special substances called

(a) dichroic substance  (b)super conductors    

(c) organic substances (d) None of them

v  A human eye acts like a

(a) laser                 (b) Mirror                    

(c) Lens                 (d) All above

v  Fibre optics system can be used for

(a) word processing           (b) image transmitting

(c) image processing & receiving    (d) All above

v  1.33 is the value of refractive index of

(a) Air                   (b) Water                    

(c) Vacuum           (d) Glass

v  Image produced by a simple microscope is

(a) Inverted but real              (b) Erect but virtual    

(c) Inverted but magnified (d) All above

v  Optical fibres are used in

(a)Tele communication    (b)  Medical diagnostics

(c) Computer network (d) All of above

v  Behaviour of internal energy is similar to

(a) Electrical energy          (b) Gravitational P.E.

(c) Magnetic energy       (d) All of above

v  Working of a bicycle pump is in accordance to

(a) Pascal’s law     (b) Archimede’s law   

(c)First law of thermodynamics (d) none of these

v  P.E. associated to the molecules of an ideal gas is considered to be

(a) Zero                 (b)  100 J                     

(c)very low           (d) Very high

v  Boyle’s law is applicable to

(a) isobaric process           (b) isochoric process   

(c)isothermal process      (d) Adiabatic process

v  Interference effects of light were verified by

(a) Thomas young (b) Huygen                  

(c) Bragg               (d) Michelson

11th Physics Important Short Questions Unit No.9 &11

Attempt any twenty two Short Questions.                                                  

1.         Under what conditions two or more sources of light behave as coherent sources?

2.         How is the distance between interference fringes affected by the separation between the slits                of Young’s experiment? Can fringes disappear?

3.         Can visible light produce interference fringes? Explain.

5.         An oil film spreading over a wet footpath shows colours. Explain how does it happen?

11.       Why would it be advantageous to use blue light with a compound microscope?

14.       How the light signal is transmitted through the optical fibre?

17.       Specific heat of a gas at constant pressure is greater than specific heat at constant volume. Why?

18.       Give an example of process in which no heat is transferred to or from the system but the temperature of the system changes.

20.       Is it possible to construct a heat engine that will not expel heat into the atmosphere?

21.       A thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?

22.       What happens to the temperature of the room, when an airconditioner is left running on a table in the middle of the room?

23.       Can the mechanical energy be converted completely into heat energy? If so give an example.

24.       Does entropy of a system increase or decrease due to friction?

25.       Give an example of a natural process that involves an increase in entropy.

11th Physics Important Long Questions Unit No.9 &11

Attempt any three Questions.                                                                              

Q.1      (a) Explain young’s double slit experiment?

            (b) Light of wavelength 546 nm is allowed to illuminate the slits of Young’s experiment. The separation between the slits is 0.10 mm and the distance of the screen from the slits where interference effects are observed is 20 cm. At what angle the first minimum will fall? What will be the linear distance on the screen on the screen between adjacent maxima?

Q.2      (a) Give the details of Michelson’s Experiment for speed of light?  

Q.3      (a) State 1^st and 2^nd law of thermodynamics? Also explain 1^st law of thermodynamics?

            (b) A sample of gas is compressed to one half of its initial volume at constant pressure of 1.25 x 10⁵ Nm^-2. During the compression, 100 J of work is done on the gas. Determine the final volume of the gas.

Q.4      (a) Discuss total internal reflection?

            (b) A heat engine performs 100 J of work and at the same time rejects 400 J of heat energy to the cold reservoirs. How much is the effectiveness of an engine?