WorksheetsChemistry Class 11
Total questions: 20
Worksheet time: 20mins
Which of the following is never true for cathode rays?
They possess kinetic energy
They are electromagnetic waves
They produce heat
They produce mechanical pressure.
If electron travels with a velocity equal to the velocity of light its mass will be
Zero
Infinite
Uncertain
Unpredictable
The space between a proton and electron in hydrogen atom is
Full of air
Full of ether
Full of electromagnetic radiations
Empty
Which one of the following statements is wrong about photon ?
Photon’s energy is hv
Photon’s rest mass is zero
Momentum of photon is hv/c
Photon exerts no pressure
In the Bohr’s orbit , what is the ratio of total kinetic energy and total energy of the electron ?
-1
-2
+1
+2
The ionisation potential has hydrogen atom is 13.6 eV, the ionisation potential for He+ is
54.4 eV
6.8 eV
13.6 eV
24.5 eV
The one electron species having ionization energy of 54.4 eV is
He+
B4+
Li2+
Be2+
The radius of the first bohr orbit of hydrogen atom is 0.59 Å .The radius of the third orbit of He+ will be
8.46 Å
0.705Å
1.59 Å
2.38 Å
The ratio of ionisation energy of H and Be3+ is
1:1
1:3
1:9
1:16
For a d- electron ,the orbital angular momentum is
√6 (h/2π )
√2 (h/2π )
(h/2π
2(h/2π )
In which case the wavelength emitted is minimum?
An electron jumps from 2nd to 1st level
An electron jumps from 3rd to 2nd level
An electron jumps from 4th to 3rd level
An electron jumps from 5th to 4th level
The work function of a metal is 4.2 eV . If radiations of 2000 Å fall on the metal then the kinetic energy of the fastest photoelectron is
1.6 x 10 -19 J
16 x 1010 J
3.2 x 10-19 J
6.4 x 10-10 J
In photoelectric effect ,the kinetic energy of the photoelectrons increases linearly with the
Wavelength of incident light
Frequency of incident light
Velocity of incident light
Atomic mass of the element
The wavelength associated with a golf ball weighting 200g and moving at a speed of 5 m/h is of the order
10-10 m
10-20 m
10-30 m
10-40 m
The maximum number of 4 f electrons having spin quantum number -½ is
4
5
7
14
Which shell would be the first to have g – subshell ?
4th
5th
6th
7th
The nodes present in 3 p-orbital are
One spherical, one planar
Two spherical
Two planar
One planar
The number of radial nodes in 3s and 2p respectively are
2 and 0
1 and 2
0 and 2
2 and 1
The increasing order for the values of e/m (charge/mass) is
e ,p ,n,α
n, p , e, α
n, p ,α , e
n, α ,p, e
Velocity of electron in the first orbit of H- atom as compared to that of velocity of light is nearly
1/10th
1/100th
1/1000th
Same
