# ENGINEERING PHYSICS KTU 2016 PREVIOUS QUESTION PAPER WITH ANSWERS FOR S1,S2 FIRST YEAR STUDENTS

**KTU Previous Question Paper 2016 with answers for Engineering Physics**

**1. What do you mean by quality factor of an oscillator?**

**ANS:**

Quality factor

**(Q)**of an oscillator is defined as 2Î times the ratio of energy stored to the average energy loss per period.**2.What is the relation between path difference and phase difference in wave motion?**

**ANS:**

A path difference of x0 will correspond to a phase difference of

**3.Two independent source of light can not produce interference fringes. Why?**

**ANS:**

Two sources of light with same wavelength and amplitude with a constant phase difference is called coherent sources.

Only coherent sources can produce interference pattern. Two independent sources can never be mutually coherent.

**4.Define dispersive power of a grating.**

**ANS:**

Dispersive power of grating is defined by the ratio of change in angle of diffraction to corresponding change in wave length. Dispersive power of grating is given by

**5.Distinguish between plane polarized light and unpolarized light.**

**ANS:**

• Un-polarized light has electrical component in every direction, at any given time, but the polarized light has the electric component only in one direction for a given time.

• When the un-polarized light is polarized, it is always reduced in intensity.

**6.What is Meissner effect ?**

**Ans:**

When a superconductor is placed in a magnetic field, that superconductor expels magnetic flux completely, a property of superconductors which has come to be known as Meissner effect.

**7.What is phase space?**

**ANS:**

Phase-space is such a space, a point in which represents a micro-state of the system. The 2f-dimensional space with f generalized position co-ordinates and f generalized momenta is called a phase space.

**8.What is the probability interpretation of wave function?**

**ANS:**

If a particle exists in a given region of space, the total probability of finding the particle in that region is one. Mathematically,

**∫Î¨*Î¨dÏ„=1**

where dÏ„ is the volume element

Î¨*Î¨ represents probability density

**9.What is the relation connecting reverberation time and total absorption?**

**ANS:**

**Reverberation Time**is the time it takes the sound to decay away 60 dBs.

__Sabine’s formula__

T = 0.16 V / A

where V is the room volume in cubic meters, and A is the total absorption in square meters.

**10.What is magnetostriction effect?**

**ANS:**

Magnetostriction effect is the property of a ferromagnetic materials (iron, nickel) that causes them to change their shape and dimensions when they are kept in a magnetic field.

**11.Write any two advantage of Hologram over photographic images.**

**ANS:**

In hologram we have the freedom of vision to change the view point and the focus, while we see a three dimensional object i.e. we have a 3D view ( Stereoscopic vision). A hologram records both intensity and phase variations.

A photograph is a two dimensional version of a 3D object i.e. it is a still of a 3D scene, with fixed viewpoint and focus. Thus there is no stereoscopic vision. A photographic plate is sensitive to only the intensity variation and not the phase variations.

**12.Distinguish between step index fiber and Graded index fiber.**

**ANS:**

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