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

Which one of the following particles has amass 1/1836 time, that of hydrogen?

Question # 2

Quantum number value for 2p orbitals are:

Question # 3

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

Question # 4

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

Question # 5

The nature of the positive rays depend on

Question # 6

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

Question # 7

Neutrons was discovered by

Question # 8

Which of the following is not a property of cathode rays

Question # 9

Spectrum of white light is continuous becuase

Question # 10

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

Question # 11

Neutron was discovered by:

Question # 12

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

Question # 13

Which of the following is not isoelectronic?

Question # 14

Mass of simple electron is:

Question # 15

An electron with n = 3 , l = 2 will be in the sub-shell

Question # 16

Smallest charge of electricity that has been measured so far is

Question # 17

Which of the following orbitals have a dumb bell shape?

Question # 18

Energy of electron in first orbit of H atom is

Question # 19

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

Question # 20

A 4f orbital has

Question # 21

The order of distance between the various Bohr orbits is

Question # 22

Which of the following is not charged particle

Question # 23

Which of the following was discovered first:

Question # 24

Maximum potential energy that an electron can have within the atom is:

Question # 25

The number of neutrons in the element 94Be is

Question # 26

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

Question # 27

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

Question # 28

Which of the following has more unpaired d-electrons?

Question # 29

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

Question # 30

The nature of positive ray depend on:

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
2 In Millikan method for determination of charge on electron the air in the chamber is ionized by
A. Protons
B. Electric field
C. X-rays
D. a - particles
3 The quantum number which describes the shape of the orbital is
A. Principle quantum number
B. Spin quantum number
C. Azimathal quantum number
D. Magnetic quantum number
4 Which of the following is not a property of cathode rays
A. They can produce x-rays when they strike a heavy metal anode
B. They can cause reduction reaction
C. They produce fluorescence in rare earth and minerals
D. They comprise neutral particles
5 The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is
A. 6.63 x 10-33m
B. 6.63 x 10-34m
C. 6.63 x 10-35m
D. 6.65 x 10-35m
6
Question Image
A. s
B. p
C. d
D. f
7 Quantum number value for 2p orbitals are:
A. n=2 ,l=1
B. n=1 ,l=2
C. n= ,l=0
D. n=2 ,l=0
8 Subsidiary quantum number specifies
A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability
9 Which have better penetrating power
A. Alpha rays
B. Beta rays
C. Gamma rays
D. X-rays
10 In the ground state, an element has 13 electrons in its M shell. The element is
A. Copper
B. Chromium
C. Nickel
D. Iron

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