No. of Printed Pages: 5 IBET-012(S) I
DIPLOMA IN CIVIL ENGINEERING (DCLE(G» I
DIPLOMA IN MECHANICAL ENGINEERING
I DCLEVI I DMEVI I DELVI I DECVI I
DCSVI I ACCLEVI I ACMEVI I ACELVI I
ACECVI I ACCSVI

Term-End Examination
December, 2016
BET-012(S) PHYSICS
Time: 2 hours Maximum Marks: 70
Note: Question no. 1 is compulsory. Attempt any four questions from questions no. 2 to 8. Use of scientific calculator is permitted.

1. Choose the correct answer from the given four alternatives: 7x2=14

Intensity of sound varies with amplitude as

I oc A2

I oc A

I oc 1/A

I oc

A wire of length 0.5 m carrying a current of 1·2 A is placed in a uniform magnetic field of induction 2 tesla. If the magnetic field is perpendicular to the length of the wire, then the force on the wire is

0.4 N

1.2 N

3.0 N

4.2 N

The resistance of an ideal voltmeter is

Zero

Infinity

100 Ohm

500 Ohm

A magnetic field exerts no force on

a magnet

an unmagnetised iron bar

a moving charge

a stationary charge

The electrical resistance of metals

increases with an increase In temperature

decreases with an Increase In temperature

is independent of temperature

sometimes increases, sometimes decreases with temperature

The SI unit of conductivity is

Ohm

Ohm^-1

Ohm^-1 m

Ohm m

If two lenses of power PI and P2 are placed in contact with each other, the power of this combination is given by

P P1P2

P P1/P2

P P1 +P2

P P2/P1

2. Derive an equation of continuity for a fluid flowing through a tube of different cross-sectional areas.

Define surface tension of a liquid. How is it related to surface energy

State Hooke's law. Calculate the longitudinal stress of a long copper wire of cross-sectional area 1.2 cm^2 stretched by a force of 4.8 x 10^3 N.

3. Differentiate between longitudinal wave motion and transverse wave motion.

Write any four factors on which loudness of a sound depends.

Define pitch of a sound. The velocity of sound in air is 330 ms^-1. Calculate the frequency of sound of wavelength 16.5 m.

4. State Ohm's law. Plot voltage -current graphs for ohmic and non-ohmic conductors.

A wire is of 4 m length, 0.2 mm diameter and has a resistance of 8 Ohm. Calculate the resistivity of the material of the wire. 7+7

5. Define molar heat capacity of a substance. Write its unit.

State Kirchhoff's law of black body radiation. Write its mathematical formula.

State the laws of refraction.

6. State Coulomb's law. Calculate the electric force between two charged spheres having charges 4 x 10-7 C and 6 x 10-7 C and placed 60 cm apart in air.

Differentiate between primary cells and secondary cells.

State Joule's law of heating. Write its mathematical form.

7. State Pascal's law. Explain with diagram the working of hydraulic jack based on this principle.

Define coefficient of viscosity. Write its SI unit.

Discuss the effect of pressure and temperature on the speed of sound in a gaseous medium.


8. Write short notes on any four of the following: 4x3 1/2=14

Stress -Strain Curve for Steel Wire

Cyclotron

Paramagnetic Substances

Electric Field

Wheatstone Bridge

Modes of Heat Transfer