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Composition of atom



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Q1. Which is a non-central force?

(a) Electrostatic force
(b) Nuclear force
(c) Gravitational force
(d) Spring force

Q2. Which of the following is a correct statement?

(a) Beta rays are the same as for cathode rays
(b) Gamma rays are high energy neutrons
(c) Alpha particles are singly ionized helium atoms
(d) Protons and neutrons have the same mass

Q3. For uranium nucleus how does its mass vary with volume?

(a) m ? V
(b) m ? 1V
(c) m ? ?V
(d) m ? V2

Q4. If elements with principal quantum number n > 4 were not allowed in nature, then what will be the number of possible elements?

(a) 60
(b) 20
(c) 4
(d) 64

Q5. ?-rays emitted from radioactive material are known as electromagnetic radiation.

(a) True
(b) False
(c)
(d)

Q6. If alpha, beta, and gamma rays carry the same momentum, which has the longest wavelength?

(a) Alpha rays
(b) Beta rays
(c) Gamma rays
(d) All have the same wavelength

Q7. When a radioactive substance emits an ?-particle, its position in the periodic table is lowered by which of the following?

(a) One place
(b) Two places
(c) Three places
(d) Four places

Q8. Which of the following has the highest neutron ratio?

(a) 8O16
(b) 2He4
(c) 26Fe56
(d) 92U235

Q9. The magnetic moment of a revolving electron around the nucleus varies with the principal quantum number as which of the following?

(a) ? ? n
(b) ? ? 1n
(c) ? ? n2
(d) ? ? 1n2

Q10. The neutron was discovered by whom?

(a) Marie Curie
(b) Pierre Curie
(c) Rutherford
(d) James Chadwick


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427 views

Assertion : Cathode Rays Do Not Travel In Straight Lines. Reason : Cathode Rays Penetrate Through Thick Sheets.

Modified 247 Year Ago

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427
247 Year Ago

Assertion : Cathode Rays Do Not Travel In Straight Lines. Reason : Cathode Rays Penetrate Through Thick Sheets.

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418 views

E/m Ratio Was Determined By

Modified 247 Year Ago

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E/m Ratio Was Determined By

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402 views

Magnitude Of K.E. In An Orbit Is Caused By

Modified 247 Year Ago

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247 Year Ago

Magnitude Of K.E. In An Orbit Is Caused By

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343 views

The Minimum Real Charge On Any Particle Which Can Exist Is

Modified 247 Year Ago

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247 Year Ago

The Minimum Real Charge On Any Particle Which Can Exist Is

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342 views

Assertion : Cathode Rays Are A Stream Of α -particles. Reason : They Are Generated Under High Pressure And High Voltage.

Modified 247 Year Ago

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342
247 Year Ago

Assertion : Cathode Rays Are A Stream Of α -particles. Reason : They Are Generated Under High Pressure And High Voltage.

0 votes
0 Answer
324 views

The Average Distance Of An Electron In An Atom From Its Nucleus Is Of The Order Of

Modified 247 Year Ago

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247 Year Ago

The Average Distance Of An Electron In An Atom From Its Nucleus Is Of The Order Of

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