An isotone of 32Ge76 is:

(i) 32Ge77 

(ii) 33As77 

(iii) 34Se77 

(iv) 34Se78 

1. only (i) & (ii)

2. only (ii) & (iii)

3. only (ii) & (iv)

4. (ii) (iii) & (iv)

Subtopic:  Number of Electron, Proton & Neutron |
 82%
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Which of the following has greater number of electrons than neutrons?

1. Al3+

2. O2-

3. F-

4. C

Subtopic:  Number of Electron, Proton & Neutron |
 75%
From NCERT
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The work function of a metal is 4.2 eV. If radiations of 2000 A0 fall on the metal then the kinetic energy of the fastest photoelectron is 

1. 1.6 x 10-19

2. 16 x 1010

3. 3.2 x 10-19

4. 6.4 x 10-10

Subtopic:  Photo Electric Effect |
 75%
From NCERT
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The relationship between energy E, of the radiation with a wavelength 8000 A0 and the energy of the radiation with a wavelength 16000 A0 is: 

1. E1 = 6E2

2. E1 = 2E2

3. E1 = 4E2

4. E1 = 1/2E2

Subtopic:  Electromagnetic Radiation |
 86%
From NCERT
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The transition of electrons in H atom that will emit maximum energy is:

1. n3  n2

2. n4  n3

3. n5  n4

4. n6  n5

Subtopic:  Hydrogen Spectra |
 79%
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The transition in the He+ ion in the balmer series that would have the same wave number as the first Lyman line in the hydrogen spectrum is-

1. \(2 \rightarrow1\) 2. \(5 \rightarrow3\)
3. \(4 \rightarrow2\) 4. \(6 \rightarrow4\)
Subtopic:  Hydrogen Spectra |
 62%
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If the speed of electron in Bohr's first orbit of hydrogen atom be x, then speed of the electron in 3rd orbit is:

1. x/9

2. x/3

3. 3x

4. 9x

Subtopic:  Bohr's Theory |
 69%
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In Bohr's model of the hydrogen atom the ratio between the period of revolution of an electron in the orbit n=1 to the period of revolution of the electron in the orbit n=2 is

1. 1:2

2. 2:1

3. 1:4

4. 1:8

Subtopic:  Bohr's Theory |
 62%
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A cricket ball of 0.5 kg is moving with a velocity of 100 ms-1. The wavelength associated with its motion is:

1. 1/100cm

2. 6.6 x 10-34m

3. 1.32 x 10-35m

4. 6.6 x 10-28m

Subtopic:  De Broglie Equation |
 84%
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The number of electrons in  19 K with quantum numbers n=3; l=0 is/are:

1. 2

2. 1

3. 4

4. 3

Subtopic:  Number of Electron, Proton & Neutron |
From NCERT
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