NAT I Medical Physics With Answers

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NAT I Medical Physics

Sr. # Questions Answers Choice
1 When a Na ion and a CI ion are placed in air a force F acts between them when they are separated by a distance of 1 cm from each other the permittivity of air and the dielectric constant of water are ε0 and K respectively When a piece of salt is placed in water then the force between Na+ and CI- ions separated by a distance of 1 cm will be F FK/ε<sub>0</sub> F/Kε<sub>0</sub> F/K
2 Two point charges placed at distance of 20 cm in air repel each other with a certain force.When a dielectric slab of thickness 8 cm and dielectric constant K is introduced between these point charges force of interaction becomes half of its previous value Then K is approximately. 2 4 √2 1
3 A point charge Q is placed at the mid-point of a line joining two charges 4q and q. if the net force on charge q is zero. then Q must be equal to -q +q -2q +4q
4 In a Millikan's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19 C. The number of excess electrons on the drop is 3.9 4 4.2 6
5 Two point charge +3μC and +8μC repel each other with a force of 40 N. if a charge of -5μC is added to each of them then the force between will become -10N +10N +20N -20N
6 What is the average energy of N molecules of monoatomic gas? 1/2 NkT NkT 3/2 NkT 5/2 NkT
7 What is the ratio of r.m.s velocity for O2 to H2? 1/4 4 √4 : 1 1 :&nbsp;√4
8 At 0° K which of the following properties of a gas will be zero? Kinetic energy Potential energy Vibrational enegy Density
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