** Council for Technical Education and Vocational training**

**Office of the Controller of Examinations**

** Sanothimi, Bhaktapur**

**Program: General Medicine/pharmacy/lab/Radiography/Dental science(Dental Hygine) Homeopathy/ Ophathalmic **

**Year/part : First year**

**Subject : physics**

** ** **Group “A”**

**Attempt (any Nine) Question.**

**1.Find the Dimensional Formula of potential difference.**

**2.Which one in more elastic steel or iron explains. Why ?**

**3.Why water at 100*c less hotter than stem at 100*c.**

**4.What is causes of refraction of light ?**

**5.State the coulomb’s law in electrostatics.**

**6.Which one is more dangerous AC or DC why?**

**7.Write two important properties of magnetic lines of force.**

**8.Action and reaction are always equals but opposite to each other then why not they cancel each other?**

**9.what is the value of angle of dip for same horizontal and vertical component?**

**10.Discuss the use of x-rays in medicine?**

**What do you mean by binding energy ?****What are cathode rays ? Does it Deflect by electric field?****Explain greenhouse effect.**

** Group “B”\**

** Attempt (any seven ) Questions.**

**14.State and prove the principal of conservation of mechanical energy during free fall .**

**15.Define acceleration due to gravity. How the value of “g” varies with depth ?**

**Define α and r and drive a relation between them.**

**17.Define focal length and radius of curvature of mirror and derive a relation between them.**

**Explain how newton develop the formula of velocity of sound in air . Also explain about its correction.****What do you mean by electric potential derive a relation for it.****Define current density and drift velocity derive a relation between them.**

**21.What do you mean by magnetic moment ? Find the magnetic field strength due to bar magnetic field due to bar magnet on its axial line.**

**What is photo electric effect? Discuss the Einstein photoelectric effect.**

**23.State and explain radioactive decay law.**

** Group C**

**Attempt (any five ) Questions**

**24.A wire of length 10cm is stretched to 12 cm by 100N force, if area of cross section of that wire is 0.2cm^2 , Find youngs Modulus of elasticity and energy stored in the wire .**

**A projectile is fired from the ground level with velocity 100m/s at 30* with vertical. Calculate the maximum horizontal range and time taken by projectile to reach maximum height .****A glass vessel of volume 50cm^3 is filled with mercury and it heated from 20*c to 80*c. What volume of mercury will over flow ?**

**27.An object 1cm high is placed at distance of 30cm in front of a convex mirror of focal length 20cm. Find the height of the image.**

**28.Prove, 1amu = 931Mev**

**Velocity of sound at NTP is 332 m/s, Than calculate velocity of sound at 50*c.**

**30.Two resistor 6Ω and 3Ω are connected with a cell of p.d 6 volt. Find out the current through each resistor.**

**Calculate the energy in electron volt of quantum radiation of wavelength of 0.15nm. ( c=3*10^8 ms^-1 , h=6.6*10^-34**

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