Important Paper B. Pharma

1. A closed pipe and an open pipe of same length procedure 2 beats, when they are set into vibration simultaneously in their fundamental mode. If the length of the open pipe is halved, and that of closed pipe is double, and if they are vibrating in the fundamental mode, then the number of beats produced is
(a) 8                             
(b) 4
(c) 7                             
(d) 2
Ans. (c)
2. When monochromatic light falls on a photosensitive material, the number of photoelectrons emitted per second is n  and their maximum kinetic energy is Kmax. If the intensity of incident light is doubled, then
(a) both n  and Kmax are halved
(b) n  is doubled but Kmax remains same.
(c) Kmax is doubled but n  remains same.
(d) both n  and Kmax are doubled
Ans. (b)
3. A plane electromagnetic wave travels in free space. Then the ratio of the magnitudes of electric and magnetic fields at a point is equal to
(a) Energy of electromagnetic wave
(b) Inverse of the velocity of the electromagnetic wave
(c) Inverse of the energy of electromagnetic wave
(d) Velocity of the electromagnetic wave
Ans. (d)
4. The percentages of void space for simple cubic, body centered cubic and hexagonal close packed arrangements respectively are
(a) 32, 48, 26                
(b) 48, 32, 26
(c) 48, 26, 32                
(d) 26, 48, 32
Ans. (b)
5. If 240 mL of a gas X diffuses through a porous membrane in 20 min whereas the same volume of methane diffuses in 10 min at the same temperature and pressure, the molar mass in g mol-1 of gas X is
(a) 128                         
(b) 8
(c) 64                           
(d) 32
Ans. (c)
6. The rms speed of helium in ms-1 (atomic mass = 4.0 g mol-1) at 400 K is
(a) 1580                       
(b) 15.8
(c) 28                           
(d) 158
Ans. (a)
7. Which one of the following is the first step in allopatric speciation?
(a) Polyploidy
(b) Geographic isolation
(c) Hybridization
(d) Genetic drift
Ans. (b)
8. In Periplaneta, which one of the following helps to nourish the sperms?
(a) Utriculi brevores
(b) Ejaculatory duct
(c) Vas deferens
(d) Utriouli majors
Ans. (a)
9. In Periplaneta, duetus ejaculatorius of male reproductive system lies in
(a) 6th segment             
(b) 7th segment
(c) 8th segment             
(d) 5th segment
Ans. (b & c)
10. The type of syngamy seen in Trychonympha is
(a) Conjugation             
(b) Hologamy
(c) Anisogamy              
(d) Isogamy
Ans. (b)
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