Atoms Test

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Atoms Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

State the amount of charge on each particle in a cathode ray tube

A
$$-3.2 \times 10^{-19} C$$

B
$$-1.6 \times 10^{-19} C$$

C
$$+1.6 \times 10^{-19} C$$

D
$$+3.2 \times 10^{-19} C$$

Solution

Charge on each particle is equal to the charge of electron
$$=-1.6\times10^{-19}C$$
Question 2
1 / -0

What is the purpose of anode in a Cathode ray tube?

A
To provide potential energy to electrons

B
To provide kinetic energy to protons

C
To provide potential energy to protons

D
To provide kinetic energy to electrons

Solution

In a Cathode ray tube electrons comes out from cathode. After cathode, anode is placed, which as being +ively charged, accelerates electrons and provide them kinetic energy.
Question 3
1 / -0

Name a device which is commonly used to convert an electric signal into a visual signal.

A
Polariser

B
RMS converter

C
Cathode ray tube

D
None of the above

Solution

Cathode ray tube is commonly used to convert an electrical signal into a visual signal. A cathode ray tube is a vacuum tube consisted of electron gun and a phosphorescent screen and is used to display images. It accelerates and deflects electron beam to create images.
Question 4
1 / -0

What change is noticed in cathode ray tube when the anode voltage is increased ?

A
Brightness of the screen increases.

B
Kinetic energy of electrons reaching the screen increases.

C
Kinetic energy of electrons reaching the screen decreases.

D
Kinetic energy of electrons reaching the screen remains the same.

Solution

Kinetic energy of the electrons reaching the screen $$K = eV$$
where $$V$$ is the anode voltage and $$e$$ is the electronic charge.
As the anode voltage is increased, the electrons get accelerated at faster rate which results in increase in the kinetic energy (or velocity) of the electrons.
Question 5
1 / -0

How can the brightness of the pattern on the screen or cathode ray tube be changed ?

A
By changing the negative potential on grid.

B
By changing the positive potential on grid.

C
We can't increase the brightness

D
None of the above

Solution

By changing the negative potential of the grid, we can control the number of electrons per unit time or the current in the cathode ray tube which changes the brightness.
Question 6
1 / -0

The diagram below shows a cathode ray tube in which the arrow indicates a beam of charged particles approaching an electric field between the plates A and B. Name the charged particles.

A
Electron

B
Proton

C
Neutron

D
Alpha

Solution

Cathode Ray Tube (CRT) is an apparatus used as a display device in televisions and computers. It is essentially made up of 4 parts:
1. Electron Gun
2. Focussing and Accelerating Anodes
3. Horizontal and Vertical Deflection Plates
4. Evacuated Glass Envelopes
Electron gun is used to produce stream of charged electrons.
Question 7
1 / -0

Why is the screen of the cathode ray tube coated ? Name the material used for coating.

A
florocent material.

B
normal material

C
highy resistive material

D
none of these

Solution

The screen is coated with florocent material.
On striking this coat on the screen the electronic beam appears as visual pattern of bright spots so that we can view it.
Question 8
1 / -0

Why hotter filament is used in cathode ray tube ?

A
To reduce rate of electron emission

B
To increases rate of electron emission

C
To increases energy emission

D
To decrease energy emission

Solution

Thermal energy given to the charge carriers overcome the work function of the metal surface and thus flow of charge carriers (electrons) takes place from the metal surface. More the thermal energy given to the metal surface by increasing its temperature, more easily the charge carriers overcome the work function and thus more will be the rate of emission of charge carriers. Hence hotter filament is used in cathode ray tube to increase the rate of electron emission.
Question 9
1 / -0

The ratio ofthe radius of the orbit for the electron orbiting the hydrogen nucleus to that of an electron orbiting a deuterium nucleus is

A
1:1

B
1:2

C
2:1

D
1:3

Solution

Radius of orbit, r = 0.53 $$\displaystyle \frac{n^2}{Z} A $$ or $$\propto \displaystyle \frac{n^2}{Z}$$
r is independent of the mass of the nucleus
Z is same for both hydrogen and deuterium
$$\therefore$$ Ratio of radii = 1:1
Question 10
1 / -0

Which transition emits light of lower frequency?

A
n=6 to n=2

B
n =2 to n =1

C
n= 2 to n= 6

D
n= 1 to n=2

Solution

$$E=$$$$\cfrac{hc}{\lambda}={ R }_{ o }\left[ \cfrac { 1 }{ { { n }_{ 1 } }^{ 2 } } -\cfrac { 1 }{ { { n }_{ 2 } }^{ 2 } } \right] \\ h\nu={ R }_{ o }\left[ \cfrac { 1 }{ { { n }_{ 1 } }^{ 2 } } -\cfrac { 1 }{ { { n }_{ 2 } }^{ 2 } } \right] $$
Put the values of $$n_1$$ and $$n_2$$ for each options and then we get lower frequency when $$n=6$$ to $$n=2$$.

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Atoms Test - 17

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Atoms Test - 17

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SHARING IS CARING

Question 1

$$-3.2 \times 10^{-19} C$$

$$-1.6 \times 10^{-19} C$$

$$+1.6 \times 10^{-19} C$$

$$+3.2 \times 10^{-19} C$$

Solution

Question 2

To provide potential energy to electrons

To provide kinetic energy to protons

To provide potential energy to protons

To provide kinetic energy to electrons

Solution

Question 3

Polariser

RMS converter

Cathode ray tube

None of the above

Solution

Question 4

Brightness of the screen increases.

Kinetic energy of electrons reaching the screen increases.

Kinetic energy of electrons reaching the screen decreases.

Kinetic energy of electrons reaching the screen remains the same.

Solution

Question 5

By changing the negative potential on grid.

By changing the positive potential on grid.

We can't increase the brightness

None of the above

Solution

Question 6

Electron

Proton

Neutron

Alpha

Solution

Question 7

florocent material.

normal material

highy resistive material

none of these

Solution

Question 8

To reduce rate of electron emission

To increases rate of electron emission

To increases energy emission

To decrease energy emission

Solution

Question 9

1:1

1:2

2:1

1:3

Solution

Question 10

n=6 to n=2

n =2 to n =1

n= 2 to n= 6

n= 1 to n=2

Solution

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