Important Paper Medical AIIMS

1. The OR gate follows the Boolean expression, for A and B as two input variables and Y as output :
(a) A + B = Y                                          
(b) A B = Y
(c) A = Y                                                                
(d) None of these                                                                                
Ans (a)
2.  If the two interfering beams have intensities in the ratio of 9 : 4. The ratio of intensities of maxima and minima in the interference pattern will be :
(a) 4 : 9                                                 
(b) 3 : 4
(c) 1 : 25                                               
(d) 25 : 1                                                                                                               
Ans (d)
3. The charge of an electron is 1.6 x 10-19 C. How many electrons strike the screen of cathode ray tube each second, when the beam current is 16 m A ?
(a) 10-19                                                 
(b) 10-17
(c) 1018                                                 
(d) 1017                                                                                                 
Ans (b)
4.  A 500 kg horse pulls a cart of mass 1500 kg along a level road with an acceleration of 1 m/ s2. If the coefficient of sliding friction 0.2. The horizontal force exerted by the earth on the horse is :
(a) 6000 N                                            
(b) 5000 N
(c) 4000 N                                            
(d) 3000 N                                                                                            
Ans (a)
5. A 1.0 kg ball falls vertically on to the floor with a speed of 25 m/s. It rebounds with an initial speed of 10 m/s. Find the restitution coefficient and the impulse acting on the ball during contact, if the ball is in contact for 0.02 s. What is average exerted force on the floor ?
(a) 0.1, 55 kg m/S, 1550 N
(b) 0.2, 45 kg m/s 1650 N
(c) 0.3, 30 kg m/s, 1550 N
(d) 0.4, 35 kg m/s, 1750 N                                                                                                                                 
Ans (d)
6.  A substance reduces to 1/16th of its original mass in 2 h. The half-life period of the substance will be :
(a) 120 min                                           
(b) 60 min
(c) 30 min                                             
(d) 15 min                                                                                             
Ans (c)
7. If the distance between the conduction band and valence band is 1 eV. This combination is :
(a) semiconductor                              
(b) conductor
(c) metal                                               
(d) insulator                                                                                         
Ans (a)
8. In a nuclear fission reaction :
(a) A heavy nuclei breaks by itself
(b) A heavy nuclei bombarded by thermal neutrons break up
(c) A light nucleus bombarded by thermal neutrons break up
(d) The light nucleus combine to Produce a heavier nucleus                                                                                           
Ans (a)
9.  In 1865 the existance of electromagnetic waves was predicted by :
(a) Maxwell                                          
(b) Hertz
(c) Bose                                                 
(d) Marconi                                                                                          
Ans (a)
10. The Wavelength of the first member of the Balmer series of hydrogen spectrum is 6563 A. Calculate the wavelength of second member of the Paschen series in the same spectrum :
(a) 8563 A                                            
(b) 10818 A
(c) 6409 A                                            
(d) 12818 A                                                                                          
Ans (d)
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