Important Questions AMU-Medical 

1. The ionization potential of hydrogen atom is 13.6 V. the energy needed to ionize a hydrogen atom which is in its n = 2 state is about
(a) 3.4 eV
(b) 1.5 eV
(c) 10.2 eV
(d) 13.6 eV
Ans: (a)
2. Consider the following processes
1. Electrical oscillation
2. Rapid deceleration of fast electrons
3. Atomic transition
Which of these are likely to produce visible light?
(a) 3 only
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3
Ans: (d)
3.The refractive indices of the material of a lens for violet and red colours are respectively 1.56 and 1.54. if the local length of the lens for violet light is 40 cm, then focal length for red colour is
(a) 41.48 cm
(b) 20.25 cm
(c) 15.3 cm
(d) 2.8 cm
Ans: (a)
4. A person who can see things most clearly at a distance of 10 cm requires spectacles to enable him to see clearly things at a distance of 30 cm. the focal length of the spectacles is
(a) 10 cm
(b) 18 cm
(c) 30 cm
(d) 15 cm
Ans: (d)
5. A force of 106 N/m2 is required for breaking a material. If the density of the material is 3 × 103 kg/m3, then what should be the length of the wire made of material, so that it breaks by its own weight?
(a) 17 m
(b) 34 m
(c) 26 m
(d) 23 m
Ans: (b)
6. The surface tension of water is 7 × 10-2 N/m. the weight of water supported by surface tension in a capillary tube of 0.1 mm radius, will be
(a) 44 × 10-6 N
(b) 22 × 10-6 N
(c) 33 × 10-6 N
(d) None of these
Ans: (a)
7. A rain drop of radius 0.3 mm has a terminal velocity of 1 m/s in air. The velocity of air is 18 × 10-5 poise. The viscous force on the drop is
(a) 16.95 × 10-7 N
(b) 1.695 × 10-8 N
(c) 1.017 × 10-11 N
(d) 101.73 × 10-9 N
Ans: (d)
8. When temperature is increased from 00C  to 2730C, in what ratio the average kinetic energy of molecules change?
(a) 1
(b) 3
(c) 4
(d) 2
Ans: (d)
9. The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at 00C is 3180 m/s. the pressure of hydrogen gas will be (density of hydrogen gas = 8.99 × 10-2 kg/m3 and 1 atm = 1.01 × 105 N/m2)
(a) 3.0 atm
(b) 2.0 atm
(c) 1.0 atm
(d) 1.5 atm
Ans: (a)
10. In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8 J of work is done on the gas, if the initial internal energy of the gas was 30 J. the final internal energy will be
(a) 36 J
(b) 15 J
(c) 18 J
(d) 9 J
Ans: (c)
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