Questions with Answer B - Pharma

1. Under the action of a force F = Cx, the position of a body changes from 0 to x. The work done is
(a) ½ Cx2                      
(b) Cx2
(c) Cx                          
(d)  ½ Cx
Ans. (a)
2. The angle turned by a body undergoing circular motion depends on time as 𝜃 = 𝜃0 + 𝜃1t + 𝜃2t2. . Then the angular acceleration of the body is
(a) 𝜃1                            
(b) 𝜃2
(c) 2 𝜃1                         
(d) 2 𝜃2
Ans. (d)
3. A rocket of mass 1000 kg exhaust gases at a rate of 4 kg/s with a velocity 3000 m/s. The thurst developed on the rocket is
(a) 12000 N                  
(b) 120 N
(c) 800 N                      
(d) 200 N
Ans. (a)
4. The dimensions of pressure gradient are
(a) ML-2T-2                     
(b) ML-2T-1
(c) ML-1T-1                     
(d) ML-1T-2
Ans. (a)
5. Two parties are projected simultaneously in the same vertical plane, from the same point, both with different speeds and at different angles with horizontal. The path followed by one, as seen by the other, is
(a) a vertical line
(b) a parabola
(c) a hyperbola
(d) a straight making a constant angle (≠900)with the horizontal
Ans. (d)
6. A small ball describes a horizontal circle on the smooth inner surface of a conical funnel. If the height of the plane of the circle above the vertex be 10 cm; what is the speed of the particle?
(a) 2 m/s                      
(b) 4 m/s
(c) 16 m/s                    
(d) 1 m/s
Ans. (d)
7. At what temperature is the r.m.s. velocity of a hydrogen molecule equal to that of an oxygen molecule at 470C ?
(a) 80 K                        
(b) -73 K
(b) 3 K                         
(d) 20 K
Ans. (d)
8. A material has Poisson’s ratio 0.5. If a uniform rot of this material suffers a longitudinal strain of 2  10-3, what percentage increase in volume take place?
(a) 2%                          
(b) 2.5%
(c) 5%                          
(d) 0%
Ans. (d)
9. A metallic sphere cools from 500C  to 400C  in 300 sec. If the room temperature is 200C, then its temperature in next 5 minutes will be
(a) 380C                        
(b) 33.30C
(c) 300C                        
(d) 360C
Ans. (b)
10. The period of oscillations of a mass 1.6 kg suspended from a spring is 2 seconds. If along with it another mass  kg is also suspended, the period of oscillations increases by one second. The mass  is
(a) 1 kg                        
(b) 2 kg
(c) 1.6 kg                     
(d) 2.6 kg
Ans. (b)
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