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DPP-1Atomic structure
Which of the following statement about the electron is incorrect ?
A
B
C
D
It is a negatively charged particle
The mass of the electron is equal to the mass of neutron
It is a basic constituent of all atoms
It is a constituent of cathode rays.
Which of the following statement about the electron is incorrect ?
A
B
C
D
It is a negatively charged particle
The mass of the electron is equal to the mass of neutron
It is a basic constituent of all atoms
It is a constituent of cathode rays.
Which of the following statement about the electron is incorrect ?
Solution:The mass of electron is very small as compared to the mass of neutron.
The e/m value of proton
A
B
C
D
Less than e/m value of electron
Equal to e/m value of electron
Greater than e/m value of electron
None
The e/m value of proton
A
B
C
D
Less than e/m value of electron
Equal to e/m value of electron
Greater than e/m value of electron
None
The e/m value of proton
Solution:The mass of proton is much greater than the mass of electron . Hence the ratio of e/m of proton is smaller than e/m of electron.
Q- Nuetrons can be found in all atomic nuclei except in one case . Which is this atomic nucleus and what does it consist of ?
Q- Nuetrons can be found in all atomic nuclei except in one case . Which is this atomic nucleus and what does it consist of ?
Solution:
The nucleus of hydrogen atom does not contain any neutrons. It consists of only one proton.
A strong argument in favour of the particle nature of cathode rays is that they
A
B
C
D
Produce fluorescence
Travel through vacuum
Can rotate a light paddle wheel placed in their path
Cast shadow of the objects lying in their path
A strong argument in favour of the particle nature of cathode rays is that they
A
B
C
D
Produce fluorescence
Travel through vacuum
Can rotate a light paddle wheel placed in their path
Cast shadow of the objects lying in their path
A strong argument in favour of the particle nature of cathode rays is that they
Solution:When a paddle wheel is kept in the path of cathode rays It was observed that the pinwheel started rotating. This shows that cathode rays are made up of particles.
Kaisa laga mera meme
What is so Unusual in mohit sir’s pic ?
For cathode rays the value of e/m :
A
B
C
D
Is independent of the nature of the cathode and the gas filled in discharge tube
Is constant
Is -1.7588 x 108 Coloumbs/g
All of the above are correct.
For cathode rays the value of e/m :
A
B
C
D
Is independent of the nature of the cathode and the gas filled in discharge tube
Is constant
Is -1.7588 x 108 Coloumbs/g
All of the above are correct.
Which is not true with respect to cathode rays
A
B
C
D
A stream of electron
Charged particle
Move with same speed as that of light
Can be deflected by the electric field
Which is not true with respect to cathode rays
A
B
C
D
A stream of electron
Charged particle
Move with same speed as that of light
Can be deflected by the electric field
Select the incorrect statement
A
B
C
D
Cathode rays has charge only no mass
Anode rays are deflected by electrical and magnetic fields
Canal rays is named for beam of positive charged particle
Anode rays do not originate from the anode
Select the incorrect statement
A
B
C
D
Cathode rays has charge only no mass
Anode rays are deflected by electrical and magnetic fields
Canal rays is named for beam of positive charged particle
Anode rays do not originate from the anode
Which of the following statements is/ are incorrect
A
B
C
D
Anode rays travelled in straight lines
Anode rays are made up of particles.
Anode rays are positively charged
Anode rays are emitted from anode
Which of the following statements is/ are incorrect
A
B
C
D
Anode rays travelled in straight lines
Anode rays are made up of particles.
Anode rays are positively charged
Anode rays are emitted from anode
Which of the following statements is/ are incorrect
Solution:
Anode rays are not emitted from the anode but are produced in the space between the anode and the cathode. These rays are believed to be produced as a result of the knock out of the electrons from the gaseous atoms by the bombardment of high speed electrons of the cathode rays on them.
Thomson from his experiment on cathode rays concluded that every atom contains
A
B
C
D
protons
neutrons
electrons
Anti neutrino
Thomson from his experiment on cathode rays concluded that every atom contains
A
B
C
D
protons
neutrons
electrons
Anti neutrino
Which of the following is not a property of cathode ray?
A
B
C
D
Cathode rays are invisible and travel in a straight line
These rays can ionise gases
These rays can penetrate through thin metal foils
These rays make materials cool on which they fall
Which of the following is not a property of cathode ray?
A
B
C
D
Cathode rays are invisible and travel in a straight line
These rays can ionise gases
These rays can penetrate through thin metal foils
These rays make materials cool on which they fall
Which of the following is not a property of cathode ray?
These rays make materials hot on which they fall
Solution:
The increasing order for the value of e/m (charge to mass ratio) for electron (e), proton (p); neutron (n) and alpha particle (α) is:
A
B
C
D
e<p<n<α
n<α<p<e
α<n<p<e
None
The increasing order for the value of e/m (charge to mass ratio) for electron (e), proton (p); neutron (n) and alpha particle (α) is:
A
B
C
D
e<p<n<α
n<α<p<e
α<n<p<e
None
The increasing order for the value of e/m (charge to mass ratio) for electron (e), proton (p); neutron (n) and alpha particle (α) is:
Solution:
Q. Find the ratio of (e/m) value for proton to α – particle (He2+)
A
B
C
D
1/2
1/4
2/1
3/2
Q. Find the ratio of (e/m) value for proton to α – particle .
A
B
C
D
1/2
1/4
2/1
3/2
Q- Find the ratio of (e/m) value for proton to α – particle .
Solution :
The expert in anything was once a beginner.
