Modern physics tgt/pgt/gic आधुनिक भौतिकी

 1. परमाणु की संरचना।                          (एटॉमिक स्ट्रक्चर)

1. The number of electron in a nuclear power X of atomic number Z and mass number A is

( a)  zero           (  b ). Z

(c). A-z.             (  d).   A

2. Which one of the following in not an elementary particle

1. Neutron

2  proton

3. Alpha particle

4. Gama particle 

3. Baryons and mesons are jointly called

1. Hyperons

2. Hadrons

3.  Bosons

4.  Femions

4.  Leptons are elementary particle of number of 

1.   Half integer spin

2.    Zero spin

3.   Integer spin

4.   Can have integer or half integer spin

5.  The ISOspin for the family of an elementary particle is 1 the number of members of the family will be

1. 1

2.  3

3.   2

4.   0

6  According to Rutherford model of atom the atom consists of

1. Positively charged nucleus surrounded by a cloud of negative charge

2 electrons orbiting a positively charged nucleus indefinite orbit

3. Same as be above with elect

ron spinning

4. A rigged sphere only

7.   If the electron in the hydrogen atom jumps from third orbit to second orbit the wavelength of radiation emitted in terms of Rydberg constant will be

1.   5R/36

2.    5/36R

3.   36/5R

4.    36R/5

Q.8

To aeroplanes pass each other in opposite direction one of them below a whistle of 540 Hz the frequency of the note heard in the other aeroplane before they have passed each other is velocity of each aeroplane is 540 km horse and velocity of sound is 350 metre per second

1. 216 hz

2.  1350 hz

3.  840hz

4.   135 hz

9.  When a road of iron is heated red hot the mechanism by which its atoms become excited to read Eve radiate visible light is most likely option number a

 the observed patience of incident counter number b. 

conduction electron bombardment si inter atomic collisions de

 the flow of electric current arising out of the difference in temperatures at different parts of the road

Ans. 1

According to planck spatial distributions of black body radiation the plank radiations observed patterns of radiation energy is not continuous but in pulse stream now known as a quantity of photon the observed patterns of incident quanta is the mechanism by which the atoms of a red-hot heated iron road be come executed to radiate visible light