CBES Board Class 9/STRUCTURE OF ATOMS MCQS CLASS 9 Sample Test,Sample questions

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Question: 
 If n = 3 we are in

1. K shell

2. L shell

3. M shell

4. F shell

Question: 
 In Rutherfords experiment  ? particles were deflected because of

1.electrostatic repulsion between ? particles and positively charged part of atom

2. electrostatic repulsion between ? particles and positively charged part of atom

3. electrostatic repulsion between ? particles and positively charged part of atom

4. electrostatic attraction between ? particles and positively charged part of atom

Question: 
 Protium has

1. one neutron

2. two neutrons

3. no neutron

4. 3 neutrons

Question: 
 The electronic configuration is the arrangement of electrons in

1.nucleus

2.shells

3. sub-shells

4. all of above

Question: 
 When Uranium-238 emits ? particles it decays in to

1. Helium

2. Carbon

3. Thorium-234

4. Uranium-235

Question: 
? particles are

1. positively charged

2.doubly positively charged

3.negatively charged

4.doubly negatively charged

Question: 
According to Rutherford  most of the space occupied by the atom is

1. filled

2. partially filled

3. empty

4. none of above

Question: 
After 3s the sub-shell begin to fill is

1.3p

2.3d

3. 3f

4. 4s

Question: 
Atoms having same atomic number but different atomic mass are called

1.derivatives

2. isotopes

3.elements

4.isomers

Question: 
Chlorine-35 exists in nature about

1. 0.35

2. 0.4

3. 0.5

4. 0.75

Question: 
D sub-shell can accommodate maximum

1. 2 electrons

2.10 electrons

3. 14 electrons

4. 6 electrons

Question: 
Electron revolves around the nucleus in orbits which have

1.variable energy

2.fixed energy

3.infinite energy

4.zero energy

Question: 
Electrons revolve only in those orbits with angular momentum as an

1. half integral multiple of h

2.integral multiple of h

3. integral multiple of h ? 2?

4. half integral multiple of 2?

Question: 
Iodine-123 is used to

1.diagnose thyroid problem

2.image the brain

3.kill cancer cells

4.trace the blood flow

Question: 
Rutherford bombarded thin gold foil with

1.? particles

2.? particles

3.? particles

4.neutrons

Question: 
The energy of an electron in orbit is proportional to

1.distance between shells

2.distance from nucleus

3.distance between two nuclei

4.positive charge inside nucleus

Question: 
The energy of emitted light is equal to

1.sum of energy levels

2.difference between energies of orbits

3.product of energies of orbits

4.none of above

Question: 
The lowest energy orbital among the following is

1.3h

2.2p

3.3s

4.3p

Question: 
Water that contains H-2 atoms is called

1.heavy water

2.light water

3.pure water

4.chlorinated water

Question: 
When an electron jumps from lower orbit to higher orbit

1. light is emitted

2. electrons are emitted

3. electrons are absorbed

4. light is absorbed

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