21. At present state, there are ________ fundamental forces in nature.
22. When charges are at rest the force is given by __________ law.
23. The _________ force is the force of mutual attraction between any two objects by virtue of their masses.
24. The _______ force is the strongest of all fundamental forces.
25. Electromagnetic force is ___________
A. attractive force only
B. attractive and repulsive force
C. repulsive force only
D. a short range force
Answer : Option B
26. Which of the following force binds The particle in the nucleons ?
A. Electromagnetic force
B. Strong force
C. Gravitational force
D. Weak force
Answer : Option B
27. Electromagnetic force is _________ range force
28. Quarks - Quarks force is produced between
A. Proton - neutron
B. proton - proton
C. neutron - neutron
D. All of the above
Answer : Option A
29. Which particle are emitted during the \(\beta \) decay from the nucleus ?
A. neutron and proton
B. electron and neutron
C. electron and neutrino
D. electron and proton
Answer : Option C
30. _______ and _______ law’s are called inverse square law
A. Gravitation and weak
B. Gravitation and coulomb’s
C. Coulomb’s and strong
D. Electromagnetic and coulomb’s
Answer : Option B