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~

~

~

eV.

State

'qR;it

identify

~

this

~

symbol

~QI(.jdl

in

~

electron

I

~

circuit.

~

Hence,

~

-13.6

is

I

~

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the

m"ffi

(m)

rectifier

logic

?

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atom

I

31lW~

the

table.

eV

31lW

of

13.6

~~

energies

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om

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~

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input-output

truth

its

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hydrogen

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wave

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circuit.

~,

of

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full

m

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this

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energy

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a

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the gate it corresponds
Write

below.

and

of

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state

ground

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in a hydrogen

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ur
ite

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d

w
carried

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principle.

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circuit

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kinetic

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given

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the

w

operation

~~~~3ffi~~~m"ffi~

(b)

diagram

.

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w
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are

You

(a)

~

A

logic

the

working

labelled

X

A

~

~

a

Y

B

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25.

24.

Draw

10

55/1

23.
its

waveforms.
3

Using de Broglie's hypothesis, explain with the help ofa suitable
diagram, Bohr's second postulate of quantization
of energy levels
atom.

state?
3

3

;'.'-cc'

--~

}

--~

--,.

~-~"

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-c~.'i""

f'

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~
x m
~

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~,

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m

15

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6

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cm

10

am

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am

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cm

cm

4

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is

orbit

lunar

the

of

radius

the

and

m

106

x

3.42

is

moon

3

m.

108

x

3.8

the

of

diameter

The

lens?

objective

the

by

formed

moon

the

of

image

.c
om

ur
ite

.e
d

w
~~

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if

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If this telescope is used to view the moon, what is the diameter

~-~

11
~

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~

CfI1

w
~

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cm

1.0

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find

used,

is

cm

1.0

length

focal

of

lens

eyepiece

an

If

m.

15

length

focal

of

lens

objective

an

has

observatory

an

at

telescope

refracting

giant

A

OR

of the microscope.

~'-

55/1

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~,

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magnification

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the length

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~

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m

108

x

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~

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the angular

-~

-

microscope. Also calculate
3

of the telescope.

of the

CfI1
~

P.T.D.

compound

the

of

power

magnifying

the

Calculate

lens.

objective

the

from

cm

6

at

placed

is

object

An

cm.

10

length

focal

of

lens

eyepiece

and

cm

4

length

focal

of

lens

objective

an

uses

microscope

compound

A

26.

in (i) series and (ii) parallel

a

_o~~,I.,:

are, in turn,

connected

at

operated

for the power of their

respectively.

P2

when

and

R2

PI

and

RI

powers

consume

resistances

V,

of

:::=~..

voltage,

of

elements
supply

heating

-.constant

Two

I
27.

---

L

Deduce the expressions

combination

when they

across the same

the

Justify

m

m

~m

may not

this statement.

5

range.

of resistance

the

for

expression

the

obt~in

law,

.e
d
circuital

Ampere's

Using

(a)

OR

of

ammeter

~,

of a galvanometer

increase its voltage sensitivity."

an

~

~
(~)

~

V~
~

I

~

~

q1"F2""('!T

I

tr

~~

~

~

~

-ij,

~

(~)
~

~
~

(~)

m

P2

sensitivity

the necessary steps to convert a galvanometer

into

Outline
RG

(c)

diagram.
current

coil galvanometer,

ur
ite

necessarily

of a moving

.c
om

"Increasing

~

of the working

giving its labelled
(b)

-q~
m

(ii)

am

~~,
~

-ij

~

PI

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~

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-ij

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State the principle

given

(a)

(mall)

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(i)

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3

a

28.

~~

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RI~

voltage supply.

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55/1

,-

. c'""

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I" ~

~

j

and

5

cases.

two

Draw

~

strong?

the
made

in

solenoid?

a
solenoid

lines

from

-q"{

~, ~

am

I

~

jl~-1I~Ic.~~ 'i:Tm-~mfu"ffi
~
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given

a

field

different
magnetic
inside

the

toroid
of

field
~

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(~~-1I~Ic.~)
~

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a

is

pattern
magnetic

the

respect

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(b)

the

w

what

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is

compare
How
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(c)
(a)

w
w

!

In

i

on its axis.
(b)

magnetic field due to a long solenoid at a point inside the solenoid

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(-q:;r{UT) ~

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~

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~

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for

the

each

turns,

coil.

in this device?

5

~:

the

inductor,

~.

a

containing

pure

!k~

value of the

What is the direction of the e.m.f. ?
Which end of the wire is at the higher potential?

5

-"

c"""

.0.

(iii)

T

(ii)

Po

Write the expression for the instantaneous
e.m.f. induced in the wire.

13

(i)

55/1

west

component

B.

angles to the horizontal

to

east

':

from

extending

L

length

of

wire

w
field

with speed v at right
magnetic

Earth's

of

is falling

by n/2 in phase.

w

straight

horizontal

A

(b)

voltage is ahead of current

~
tic
~f;'

w

circuit

a.c.

an

in

that

(a)

Show

OR

.e
d

What is the source of energy generation

'ii'"

in the

Deduce

N

roo

having

generated

ur
ite

e.m.f.

velocity

angular

generator

a.c.

an

the alternating

constant

a

of
with

coil
rotated

The

diagram.

of a labelled

is

the help

A,

with

area

of a.c. generator

of

the working

.

expression

29. State

.c
om

~?

11181"

eo

,

~

ril~il~('[

~~It.j(11

~

quR

~

fCfi

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(a.c.)

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?

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the

experiment

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~
?

~

(~)

in

-qR

"('[~fiJrqj

?

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~

~

e.

~

~
~

-q;1
~

sources

phenomenon

du

interference.
In Young's double slit

coherent

co
m

I

of

fqoqq

~

({.~.~.)

~

~

~

~

~~~

importance

rit

the

State

mrTr

({.~.~.)

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i:f

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~~I
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(iii)

(ii)

I

30.

i:f,

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(a.c.)

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n/2
mm

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~

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(~)

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(i)

~~~B~~~~~v~~fiR~~

(b)

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(a)

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~~~~I-1

M

~~I

31ftJ!1 -q;1

to produce interference

of

pattern,

is immersed

(b)

is incident

experimental

entire

the

5

slit on
of

source

monochromatic

a

from

coming

on a screen due to a narrow

a

how

explain

principle

this

Using

OR

in water?

is obtained
beam

pattern

narrow

a

which

light

principle.

w
Huygens'

State

(a)

diffraction

if

affected,

get

w
width

of Young

w

apparatus

fringe

the

does

How

.e

obtain the conditions for constructive and destructive interference.
Hence deduce the expression for the fringe width.

normally.

Show that the angular

width

of the first

diffraction

fringe

is half

of that of the central fringe.
(c)

55!1

--III

If a monochromatic source of light is replaced by white light,
what change would you observe in the diffraction pattern?
14

5
55

---"'

-

).

15

1

~

1

1

'.

1

?

m

~,

m

~

~

m

"q"'{

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mm

(1/2)

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1

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om

ur
ite

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d

w

w

w
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m

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(~)

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Cbse Class 12 Physics QP 2011 Model 1

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