12-02-2016, 04:15 PM
1st Internal Examination .Semester-I
Sub- Basic Physics.
Sub- Basic Physics.
[F.M=20]
1. Answer any ten from the followings:
Choose the correct option :
i) The dimension of Surface Tension is: (a)[M0L0T-2] , (b)[MLT-1] , ©[ML0T-2 ] , (d)[ML-2T-1 ].
ii) Which one is the fundamental unit : (a) ms-1 , (b)Ampere , ©Newton , (d)Watt.
iii) When a capillary tube is dipped in a liquid the level of liquid inside the tube rises because of: (a) viscosity, (b)elasticity, ©surface tension, (d)diffusion.
iv) In Bernoulli's theorem which of the following is conserved: (a)mass, (b)linear momentum, ©angular momentum, (d)energy.
State True or False:
v) The dimension of Torque is [ML2T2].
vi) The dimensions of Force and Moment of Inertia are same.
vii) Strain is a unit less quantity.
viii) Presence of impurity (not dissolved) in water increases its surface tension.
Fill in the blanks:
ix) The dimension of Specific gravity is _________ .
x) The mathematical formula of Buoyancy is, Buoyancy=_________ .
xi) The stored Potential Energy per unit volume= 1/2 ×________ × ________ .
xii) Compressibility is known as the reciprocal of _________ .
Answer any two: [2x5=10]
2. i)The centripetal force (F) of a rotating body depends upon the body mass (m), velocity (v), radius of the circular path ®. Find the expression of F by dimensional analysis.
ii)The time period of a pendulum t=2π√(l/g) is to be verified with the help of the principle of dimensional homogeneity. [3+2]
3.i) Mass of a substance is (100+4%) kg and volume is (10+2%) m3. Find relative error and percentage error in density.
ii) Draw stress vs. strain curve for an elastic body. Locate Proportional limit and Elastic limit, [3+2]
4.i) Define Young's modulus. ii) Define cohesive and adhesive force. iii) Why a small drop of liquid is always spherical in shape? [1+2+2]
5.i) State Jurin's law . ii)Write down the conditions of floating in equilibrium. iii) What is critical velocity? [2+2+1]