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

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Question # 1

The principle quantum number describes

Question # 2

E = hv is the

Question # 3

The value of Plank's constant 'h' is

Question # 4

The radius of first orbit of hydrogen atom

Question # 5

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

Question # 6

The mass of the neutron is of the order of

Question # 7

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

Question # 8

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

Question # 9

Rutherford's model of atom failed because:

Question # 10

The range of visible spectrum is

Question # 11

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

Question # 12

The nature of positive rays depend on:

Question # 13

The energy of ionization of an atom is the energy difference between orbital

Question # 14

For principle quantum number n=4, the total number of orbitals having l = 3 is

Question # 15

Which of the following orbitals have a dumb bell shape?

Question # 16

The radius of second Bohr's orbit is

Question # 17

Which of the following particles has longest wavelength, if they have same speed:

Question # 18

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

Question # 19

Orbitals having same energy are called

Question # 20

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

Question # 21

The orbitals having n + l = 5 are

Question # 22

Which is not true with respect to cathode rays?

Question # 23

Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration

Question # 24

Light emitted from a source has its wave length 500nm, then its wave number will be

Question # 25

Smallest charge of electricity that has been measured so far is

Question # 26

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

Question # 27

The number of electrons in the M shell of the element with atomic number 24 is

Question # 28

The orbital in Rutherford's model is

Question # 29

The credit of discovering neutron goes to

Question # 30

The ratio of the ionization energy of H and Be3+is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
2 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
A. Voltage is low
B. Discharge tube is not coloured
C. Gas does not conduct current under ordinary pressure
D. Temperature low
3 Splitting of spectral lines when atoms are subjected to strong electric field is called:
A. Zeeman effect.
B. Stark effect
C. Photoelectric effect.
D. Compton effect.
4
Question Image
A. Plank's equations
B. de Broglie's equations
C. Heisenburg's equation
D. None
5 Rutherford's model of atom failed because:
A. The atom did o have a nucleus and electrons
B. It did not account fro the attraction b/w protons and neutrons
C. It did no account for the stability of the atom.
D. There is actually no space b/w the nucleus ad the electrons.
6 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
7 Charge of an electron is:
A.

1.6 x 10-19 C

B.

9.1 x 10-34 C

C.

1.7588 x 1011 C

D.

6.62 x 10-34 C
8 Spectrum of white light is continuous becuase
A. Colors separated by dark spaces
B. There are no boundary lines between the colours
C. The radiations are in infrared region
D. The radiatins fall in ultraviolet region
9 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f
10 The velocity of photon is:
A. Independent of its wavelength.
B. Depends on its wavelength.
C. Equal to square of its amplitude
D. Depends on its source.

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