Which is the correct relation? A. 1Sv = 1Gy B. 1rem = 1Sv C. 1Gy = 1 Jkg-1 D. 1rad = 1Gy 28

A. 1Sv = 1Gy B. 1rem = 1Sv

C. 1Gy = 1 Jkg^-1 D. 1rad = 1Gy
28. Electric and Magnetic forces were unified to get electromagnetic force by

A. Maxwell and Max Planck B. Faraday and Maxwell

C. Einstein and Faraday D. Ampere and Maxwell
29. Particles experience the strong nuclear forces are called:

A. Hadrons B. baryons

C. mesons D. All these
30. One proton is made up of

A. Two down and one up quarks B. Two up and one down quark

C. Two charm and one top quark D. Two bottoms and one top quark
31. The particles which can not be verified directly.

A. Proton B. Neutron

C. electron D. Quark.
3 2. In a nuclear reaction ₆¹¹C ₅¹¹B + β⁺ + X, what does X stand for?

A. an electron B. a proton

C. a neutron D. a neutrino
3 3. In a nuclear reaction ₉₂²³⁸U _Z^ATh + ₂⁴He, the value of A and Z are

A. A = 234, Z = 94 B. A = 238, Z = 94

C. A = 234, Z = 90 C. A = 238, Z = 90