ECAT Pre Engineering Chemistry Chapter 5 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

Try The MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

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ECAT Chemistry Chapter 5 Atomic Structure

00:00
Question # 1

The radius of first orbit of H-atom is

Question # 2

Which of the following is not isoelectronic?

Question # 3

Alpha rays consist of:

Question # 4

Neutrons was discovered by

Question # 5

For which of the following sets of quantum numbers and electron will have the highest energy?

Question # 6

Rutherford's model of atom failed because:

Question # 7

The total number of possible values of magnetic quantum number for the value of l=3 is

Question # 8

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

Question # 9

The orbitals having n + l = 5 are

Question # 10

The orbital in Rutherford's model is

Question # 11

When potassium metal is exposed to violet light

Question # 12

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 13

The divisibility of atom was shown by

Question # 14

The mass of the neutron is of the order of

Question # 15

Smallest charge of electricity that has been measured so far is

Question # 16

In Millikan method for determination of charge on electron the air in the chamber is ionized by

Question # 17

Proton was discovered by:

Question # 18

Which have better penetrating power

Question # 19

Charge of an electron is:

Question # 20

Energy of electron in an orbit according to Bohr theory is negative due to

Question # 21

1 erg of energy corresponds to

Question # 22

Which of the following is not a sub-atomic particle

Question # 23

The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is

Question # 24

In which of the following pairs, the numbers of electrons in the outermost shell are different?

Question # 25

The nature of positive rays depend on:

Question # 26

Splitting of spectral lines when atoms are subjected to strong electric field is called:

Question # 27

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

Question # 28

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

Question # 29

Rutherford's experiment led to the discovery of

Question # 30

Charge to mass ratio (e/m) of the electron is determined by

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Smallest charge of electricity that has been measured so far is
A. Charge on a-rays
B. Charge on electron (1.602 x 10-19C)
C. Charge on x-rays
D. Charge on gamma rays
2 The range of visible spectrum is
A. 300 - 600 nm
B. 600 - 900 nm
C. 400 - 750 nm
D. 100 - 300 nm
3 Charge on electron was discovered by:
A. Millikan.
B. Crook.
C. Neil Bohr.
D. Rutherford.
4 The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the
A. Fourth Bohr orbit to the first Bohr orbit
B. Fifth Bohr orbit to the second Bohr orbit
C. Sixth Bohr orbit to the third Bohr orbit
D. Seventh Bohr orbit to the third Bohr orbit
5 The configuration 1s22s22p53s1shows
A. Excited state of O2
B. Excited state of neon
C. Excited state of fluorine
D. Ground state of fluorine atom
6 The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is
A. 3
B. 4
C. 5
D. 6
7 In the ground state of an atom, the electron is present:
A. In the nucleus.
B. In the second shell.
C. Nearest to the nucleus.
D. farthest from the nucleus.
8 Proton was discovered by:
A. Chadwick
B. J.J. Rhomson
C. Millikan.
D. Goldstein.
9 Anode is the surface on which probability of finding electron is:
A. 50%
B. Less than 10%.
C. More than 95%.
D. Zero.
10 The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is
A. N
B. Li
C. P
D. Na

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