8/20/2019 2nd PUC PhysicsJan 2016.pdf

1/2

SECOhID

PUC

PREPAR.ATORY

EXAMINATION

-20,6

Time:

3-15

hours

No.of

Pages:

o2

PHYSICS

-(3S)

Max

Marks:7o

No.of

Ques.:37

otal

General

Instructions

:

1]All

parts

are

comPulsory.

2]Answers

without

ieleyant

diagramlfigurei

circuit

wherevernecessarywiiinotcarryany

marks.

3]

Direct

answers

to the

numerical

problems

r,vithout

detailed

solutions

witrl

not cany

any

marks'

PART.A

Answer

ALL

the

following

questions

:

1)

Define

linear

densitY

of

charge.

2)

Write

the

SI

unit of

current

density.

3

)

What

happens

to the

self

inductance

of

a

coil

if

a

soft iron

rod

is inserted

into

the

coil

?

4)

Define

magnetic

PermeabiiitY'

5)

What

is the

significance

of

Lenz's

lau''

6)

Holv

can the

resolving

power of

a

telescope

be

increased?

7)

Who

discovered

radio activity?

8)

ExPandLED.

9)

Drau.'the

sYrnbol

of

aNAND

gate

'

10)

Give

the

value

of

the

signal

banclwidth

of a

co-axial

cable

.

PART-B

  ---

---AmsTyeF.a*y-s'IvE

of

the following

questions:

5x2:10

.W

Write

Coulomb's

lar,v in

vector form

and

explain

the

terms

.

)q

Draw

graphs showingthe

variation

ofresistivity

of semicottductor

and

metailic

conductor

with

absolute

temperature

.

W

Mention

two sources

of

energy

ioss

in a

transfonner.

L4)

Give

two

uses

of

infi'ared radiations

.

t5)

Explain

Huygen's

principle

ofsecondarywavelets.

16)

What

are

the observations

of

Rutherford's

cr

-scattering experiment?

17)

Twonucleihavemassnumbers

in theratroS:27.

What

is the ratio of their

nuclear radii?

LD

Draw

the

block

diagram

of a

generalized communication systerl

.

PART.C

Anslver any

FIVE

of the

following

questions

:

5x3=15

)S)

Obtain an expression

for

the

effective capacitance

when two capacitors

are

connected

in

series.

20)

Arrive at an expression

forthe

magnetic

dipole moment

of

a revolving

electron in

terms

of

its

angular

momentum.

?l)

Distinguish between

diamagnetic

and

ferromagnetic

materials.

22)

Derive an expression

for

the

torque experienced

by a

magnetic dipole

rvhen

placed

in an external magnetic

field.

23)

Show that the

radius of curvature of

a

concave

rnirror

is equal to

twice

its

focal length.

l0x1:10

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8/20/2019 2nd PUC PhysicsJan 2016.pdf

2/2

..

-/

U)

obtain

a relation

betr.veen

decay

constant

and

half

life

of

a radioactive

silmple

26)

Explaintheworking

ofa

zenerdiode

as

avortageregulator

PART:D

[V

dnswer

any TW_Osf

the

following

questions

.

2x5:10

Zn

Cbtain

the

expression

for

the

electric

field

at

apoint

on the

axial

line

of

an

electric

dipole.

28)

Derive

a

reration

betiveen

current

and

drift

velocity

.

29)

obtain

the expression

for

torque

acting

on

a

rectangular

current

loop

with

its

axis

perpendicularto

the

magnetic

field.

Answer

any

TWO

of

the

following

questions

:

2x5:10

30)

Usingphasor

diagram

obtain

expressions

forthe

impedance

and

current

in

a

series

LCR

circuit.

3

1)

Derive

an

expression

for

the

refractive

index

of

a

prisrn

in

terms

of

the

angle

ofthe

prism

and

the

angle

ofminimum

deviation.

32)

Explain

the

working

of

a

transistor

as

a switch.

Answer

any

THREE

of the

following

questions

:

3x5:15

33)

ABCD

is

a

square

ofside

0.Zm.Foint

charges

ofrnagnitudes

6nC,

l2nC

and

24nC

are

placed

at

the

corners

A,

B

and

C respectively.

Calculate

the potential

difference

between

D

and

the

centre

of the

square.

34)

A

uniform

wire

of

resistance

124

is

cut

into

three

pieces

in

the

rutio

l:2:3

and

the pieces

are

connected

to

form

a

triangle.

A cell

of

emf

gv

and

internal

resistance

l(-i

is

connected

across

the

highest

of

the

three

resistors.

calculate

the

current

in

each

branch

of

the

circuit.

35)

A rectangular

current

loop

of

sides

9cm

and

3cm

with

a

small

cut

is

moving

out

of

a

region

of

uniform

magnetic

field

opfmagnitude

0.3T

directed

normai

to

the

loop'

What

is

the

voltage

developed

across

the

cut

if

velocity

of

the

loop

is

10-2ms'r

in

a

direction

normal

to

the

(i)

longer

side

(ii)

shorter

side

of

the

loop?

For

how

rong

does

the

induced

voltage

rast

in

each

case?

3

6)

Two

narrow

slits

in

Young's

double

slit

experiment

are

0.

1gm

apart.when

they

are

illuminated

by

a

monochromotic

light

fringes

ofwidth

2.7

mmare

obtained

on

a

screen

0'8m

away'

Find

the

wavelength

of

light

used.If

the

source

is

replaced.

by another

source

of

waverength

450nm

find

the

change

in

the

fringe

width.

37)

For

a

metal

the

minimum

frequency

of the

incident

radiation

required

for

photo

emission

is

1.5xr015H2.

Find

its

r.vork

function.

rf

radiation

of

frequency

2

x

10l5IIz

is

incident

on the

metal

surface

find

the

maximum

kinetic

energy

of

the

emitted

photoelectrons

.

(Planek's

constant

:6.625

x

l0'3a

JS

and speed

of

light

in

vacuum is

3x108ms-r).

r.'I

r*t*il€