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Atomic Physics-Unit 1

Total questions: 51

Worksheet time: 17mins

Name
Class
Date
1.

what is atom?

a)

A Smallest Particles

b)

Biggest Particle

c)

Proton

d)

Object

2.

1. What is meant by matter?

a)

Anything that occupies space.

b)

Anything that occupies space and has weight.

3.

What are the three basic physical states in which matter can exist?

a)

Solid, liquid, and gas.

b)

solid, rock, liquid.

c)

liquid, solid, air

4.

What is meant by pressure?

a)

Mass over a given area.

b)

Force that acts on a unit of area.

5.

It is concerned with the structure and properties of the atom.

a)

Nuclear Physics

b)

Plasma Physics

c)

Atomic Physics

d)

Astro Physics

6.

Physics is the branch of ?

a)

Commerce

b)

Science

c)

Arts

d)

Sports

7.

What is the name of the particles of light?

a)

protons

b)

photons

c)

atomic particles

d)

infrared

8.

Subatomic particles with a negative charge

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

9.
Discovered the electron within the atom
a)
Thomson
b)
Chadwick 
c)
Schrodinger & Heisenberg
d)
Dalton
10.
All matter is made of what?
a)
Energy 
b)
Atoms 
c)
Electrons 
d)
Compounds 
11.
The positive particles of an atom are 
a)
Electrons 
b)
Positrons 
c)
Neutrons 
d)
Protons 
12.
What are the two main parts of the atom?
a)
nucleus and cytoplasm
b)
nucleus and electron cloud
c)
core and electron cloud
d)
protons and neutrons
13.

The measurement of e/m was possible because of an instrument made by?

a)

JJ Thomson

b)

. J Perrin

c)

Edison

d)

Bohr

14.

The e/m value of electrons comes out to be

a)

×1011\times10^{11}

b)

×10−11\times10^{-11}

c)

×1019\times10^{19}

d)

×10−19\times10^{-19}

15.

By Magnetic field Cathode rays are deflected in

a)

Straight Path

b)

Circular Path

c)

Curved Path

d)

Round Path

16.

The e/m of electron as compared to positive rays is

a)

equal

b)

greater

c)

smaller

d)

medium

17.

The cathode ray experiment was done for the first time by

a)

J.J. Thomson

b)

John Dalton

c)

Goldstein

d)

Rutherford

18.

The charge on an electron is

a)

1.6 x 10-6 coulombs

b)

1.6 x 10-20 coulombs

c)

1.6 x 10-19 coulombs

d)

1.6 x 10-16 coulomb

19.

Mass spectrometers are used to determine which of the following?

a)

Composition in sample

b)

Concentration of elements in sample

c)

Relative mass of atoms

d)

Properties of sample

20.

The Charge of Cathode Ray is

a)

Positive

b)

Negative

c)

Neutral

d)

None of the Above

21.

The charge of Positive rays is

a)

Negative

b)

Positive

c)

Neutral

d)

None of the above

22.

the diameter of discharge tube is

a)

4 cm

b)

0.1 m

c)

50 cm

d)

6 cm

23.

The length of the discharge tube is

a)

50 cm

b)

10 cm

c)

60 m

d)

4 cm

24.

a simple and convenient device used to study the conduction of electricity through gases is known as

a)

spectrometer

b)

Strong glass tube

c)

Gas discharge tube

d)

None of the above

25.

At normal temperature and pressure,

the gases are

a)

Good insulators of electricity.

b)

Good Conductor of electricity

c)

semiconductor

d)

none of the above

26.

We can make a gas conduction

a)

By Applying very High Voltage

b)

By applying very low voltage

c)

by reducing voltage

d)

None of the above

27.

Positive rays also known as

a)

Canal Ray

b)

cathode ray

c)

x-ray

d)

gamma ray

28.

Positive rays are sometimes known as the canal rays. These were discovered in---------by Goldstein.

a)

1886

b)

1896

c)

1869

d)

1879

29.

When potential difference is applied across the electrodes, electrons are emitted from

a)

Anode

b)

Cathode

c)

between cathode and anode

d)

None of the above

30.

The stream of positive ions are called

a)

Positive rays or canal rays

b)

Cathode rays

c)

negative rays

d)

none of the above

31.

the specific charge on electron is 

 em\frac{e}{m}  

a)

 1.7×1011 Ckg−11.7\times10^{11}\ Ckg^{-1}  

b)

 1.7×10−11 Ckg−11.7\times10^{-11}\ Ckg^{-1}  

c)

 1.6×1011 Ckg−11.6\times10^{11}\ Ckg^{-1}  

d)

 1.6×10−11 Ckg−11.6\times10^{-11}\ Ckg^{-1}  

32.

The positive rays can Produce

a)

Mechanical Effect

b)

Chemical Effect

c)

Mechanical as well as chemical effect

d)

None of the above

33.

In Thomson parabola method, the cathode is cooled by the

a)

Water jacket

b)

Strong Magnet

c)

Gas

d)

None of the above

34.

A liquid trap T helps to keep the pressure in

a)

Highly evacuated camera quite low

b)

Highly evacuated camera very high

c)

Discharge tube

d)

None of the above

35.

when no electric and magnetic field is applied, the positive ions strikes the screen O is called

a)

Deflected spot

b)

Undeflected spot

c)

Scattering

d)

None of the above

36.

The first accurate determination of the masses of individual atoms was made in

a)

1919

b)

1887

c)

1886

d)

None of the above

37.

The first accurate determination of the masses of individual atoms was made by

a)

Aston

b)

Thomson

c)

Goldstein

d)

None of the above

38.

Aston used a different arrangement of electric and magnetic fields. Is it true or false?

a)

True

b)

False

c)

May be

d)

None of the above

39.

Which one of the following statement is true?

a)

To produce clearer photographs by Aston Mass spectrograph

b)

To produce clearer photographs by Thomson method

c)

None of the above

40.

Aston mass spectrograph is more accurate than Thomson's parabola apparatus. Is it true or false?

a)

true

b)

false

c)

may be

d)

none of the above

41.

when the pressure of gas in discharge tube is reduced to the order of 10mm of Hg, a luminous column formed from

a)

Cathode to Anode

b)

Anode to cathode

c)

between cathode and Anode

d)

None of the above

42.

the positive column is disappears, when the pressure reaches to around

a)

0.01 mm of Hg

b)

0.5 mm of Hg

c)

0.1 m of Hg

d)

None of the above

43.
Choose the particle that has no charge.
a)
nucleus
b)
neutron
c)
proton
d)
electron
44.
In a stable atom the amount of electrons is electron is equal to
a)
neutrons
b)
protons
c)
atomic mass
d)
neutrons + protons
45.

Electric charges are created ______.

a)

by gravitational forces.

b)

separately.

c)

between 2 oppositely charged objects.

d)

by neutrons.

46.

How can a neutral object become charged?

a)

by being dipped in water

b)

by being stuck to the desk with tape

c)

by allowing gravity to work on it

d)

by having electrons added or removed

47.

Which statement best describes the electric fields in the image?

a)

The charges are neutral.

b)

Both charges are negative, so the field lines are alike.

c)

The field lines move toward a positive charge and away from a negative charge.

d)

The field lines move away from a positive charge and toward a negative charge.

48.
Magnets can interact without touching.
a)
True
b)
False
49.

The area of magnetic force around a magnet is known as its _____________.

a)

magnetic field

b)

magnetic declination

c)

magnetic fan lines

d)

magnetic tan lines

50.

What did jj thomson discover

a)

proton

b)

nucleus

c)

electron

d)

neutron

51.

What was the year jj thomson discovered the atom

a)

1897

b)

1800

c)

1913

d)

1911

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