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Magnetic materials & Nanomaterials

Total questions: 40

Worksheet time: 23mins

Name
Class
Date
1.

Magnetism in a material arises due to

a)

spin motion of electron

b)

both orbital and spin motion of electron

c)

orbital motion of electron

d)

nuclear magnetism

2.

This figure represents

a)

CVD

b)

Sol-gel

c)

Ball Milling

d)

None of these

3.

Magnetic moment of an electron is

a)

eh4πm\frac{eh}{4\pi m}

b)

eh2πm\frac{eh}{2\pi m}

c)

eh22πm\frac{eh2}{2\pi m}

d)

eh24πm\frac{eh2}{4\pi m}

4.

Magnetic susceptibility is

a)

Magnetization created by unit electric field

b)

Magnetization created by unit magnetic field

c)

Magnetization created by unit electromagnetic field

d)

poliarzaiton created by unit electromagnetic field

5.

Hysteresys lopp implies

a)

loss of electromagnetic waves

b)

loss of magnetic energy

c)

loss of electrical energy

d)

loss of electrostatic energy

6.

Hard magnets have

a)

high retentivity and high coercivity

b)

low retentivity and high coercivity

c)

low retentivity and low coercivity

d)

high retentivity and low coercivity

7.

Hard materials are used for

a)

data storage

b)

read-write device

c)

memory deivce

d)

magnetic ckt

8.

The presence of parallel alignment of magnetic dipole moment is given by which materials?

a)

Diamagnetic

b)

Ferromagnetic

c)

Paramagnetic

9.

For which of the following is magnetic susceptibility negative?

a)

Paramagnetic Materials only

b)

Ferromagnetic Materials only

c)

Diamagnetic Materials

10.

Which of the following is the unit of magnetic flux density?

a)

Newton/ampere-metre

b)

Tesla

c)

All of the above

11.

True or false? A magnet can change its polarity if placed in a strong enough magnetic field.

a)

True

b)

False

12.

If a bar magnet is broken into two pieces,

a)

both pieces will also be magnets

b)

neither piece will be a magnet

c)

only the original north piece will be a magnet

d)

only the original south piece will be a magnet

13.

The Magnetic moment per unit volume of the material is called as

a)

Magnetic flux density

b)

Intensity of Magnetization

c)

Magnetic flux

d)

Magnetic permeability

14.

Weber is the unit of

a)

Magnetic field strength

b)

Magnetic induction

c)

Magnetic flux

d)

Magnetic permeability

15.

Gold, Germanium, Silicon are examples of

a)

Diamagnetic materials

b)

Ferromagnetic materials

c)

Ferrites

d)

Paramagnetic materials

16.

“Tesla” is same as

a)

Weber-metre

b)

Weber/metre

c)

Weber/metre2

d)

Weber-metre2

17.

Bloch walls (Domain Walls) are in the _______________ material.

a)

Ferrimagnetic

b)

Antiferromagnetic

c)

Ferrites

d)

Ferromagnetic

18.

The soft magnetic materials are having

a)

low coercivity

b)

low permeability

c)

high coercivity

d)

high hysteresis loss

19.

The B/H curve can be used to determine?

a)

Iron loss

b)

Hysteresis loss

c)

Voltage loss

d)

Eddy current loss

20.
You know this substance is magnetized because
a)
all the domains have right angles
b)
the arrows are drawn in red
c)
the domains are aligned
d)
the domains are random
21.
This substance is
a)
magnetizecd
b)
unmagnetized
c)
positively charged
d)
negatively charged
22.

What is the shape of a magnetic field around a wire?

a)
b)
c)
d)
23.

What is the shape of a magnetic field around a solenoid?

a)
b)
c)
d)
24.

What is the shape of a magnetic field around the Earth?

a)
b)
c)
d)
25.

What is the shape of a magnetic field around a bar magnet?

a)
b)
c)
d)
26.
The ratio of intensity of magnetisation to the magnetization force is known as
a)
flux density
b)
susceptibility
c)
relative permeability
d)
none of the above
27.

Why the properties of nanomaterials are different significantly compared to bulk materials?

a)

Increased relative surface area

b)

Decreased relative surface area

c)

Increased lattice parameters

d)

Lower down the melting temperature

28.
Nanomaterials are interesting because:
a)
They are tiny and cute
b)
They can fit into smaller spaces
c)
Their properties depend on size 
d)
I don’t know
29.

The process of reduction of the size of the solid is

a)

Quantum physics

b)

Quantum effect

c)

Quantum confinement

30.

Nano meter is

a)

10^ -6 meter

b)

10^ -9 meter

c)

10^ -3 meter

d)

10^ -2 meter

31.

Sol-gel method is ________ approach.

a)

Bottom up

b)

Up bottom

c)

Top down

d)

Down top

32.

The sol-gel is a __________ of solid particle.

a)

Sublimation

b)

Melting

c)

Colloidal suspension

d)

Cool down

33.

Monosized nanoparticles are possible in

a)

Sol-Gel

b)

Ball milling

c)

CVD

d)

All of these

34.

Sol-gel method is ________ chemical process.

a)

Dry

b)

Wet

c)

Semi liquid

d)

Semi solid

35.

What are the two Basic Approaches to Nanomanufacturing?

a)

CLUSTER & ATOMS

b)

ATOMIC SCALE & MOLECULAR SCALE

c)

TOPDOWN & BOTTOM UP

d)

BULK & FRAGMENTS

36.

The following is an example of top down method.

a)

Electrodeposition method

b)

Chemical vapour deposition method

c)

Ball milling

d)

Precipitation method

37.

CVD stands for ____________

a)

Carbon vapour density

b)

Chemical vapour density

c)

Chemical vapour deposition

d)

Carbon vapour deposition

38.

This image explains the process of

a)

CVD

b)

Sol-Gel

c)

Ball Milling

d)

None of these

39.

This image indicates the working of

a)

CVD

b)

Sol-gel

c)

Ball-milling

d)

None of these

40.

Which property is changing with size of Shell

a)

Optical

b)

Chemical

c)

Electronic

d)

Magnetic

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