The heavier nuclei tend to have larger N/Z ratio because (a) a neutron is heavier than a proton

Yes, it is true for hydrogen atom which is represented as  1H1

Seema will have to apply larger force since she will experience more frictional force because heavy object will be pressed hard against the opposite surface and produces more friction.

(a) gravitational (c) nuclear Explanation: A neutron exerts both the gravitational and nuclear forces on a proton.  The gravitational force can be seen between a neutron and a proton. However, its strength is negligible....

(a) : Statement-1 states that energy is released when heavy nuclei undergo fission and light nuclei undergo fusion is correct. Statement-2 is wrong The binding energy per nucleon, B/A, starts at...

(c) : Since the nucleus does not contain β-particles, it is produced by the conversion of a neutron to a proton at the moment of emission. 0n1 → +1p1 + –1e0

(c) neutron has larger rest mass than the proton

Nuclear density is independent of mass number, so ratio  of nuclear densities is 1 : 1.

a) NH3 will have larger value of a because of H – bonding.  b) NH3 will have larger value of b due to larger molecular size.

Tritium, one and two....

In one dimensional elastic collision of two bodies of equal masses. The initial velocities of bodies are interchanged after collision.  Velocity of the neutron after collision is zero. Hence, it has zero energy.