Question Paper B. Pharma

1. The ratio of frequencies of the long wavelength limits of the Balmer and Layman series of hydrogen is
(a) 27 : 5                       
(b) 5 : 27
(c) 4 : 1                        
(d) 1 : 4
Ans. (a)
2. The spectrum of a star is usually
(a) continuous emission spectrum
(b) continuous absorption spectrum
(c) line absorption spectrum
(d) line emission spectrum
Ans. (c)
3. A circular flexible loop of wire of radius r carrying a current I is placed in a uniform magnetic field B. If B is doubled, the tension in the loop:
(a) is unchanged           
(b) is doubled
(c) is halved                 
(d) quadrupled
Ans. (b)
4.. If a stone is dropped into a lake from the top of a tower, the should of the splash is heard by a man on the tower after 11.5 seconds. The height of the tower is :
(a) 1000 m                    
(b) 750 m
(c) 500 m                     
(d) 250 m
Ans. (c)
5. The average value of which of the following quantities is zero for the molecule of an ideal gas in equilibrium:
(a) Kinetic energy         
(b) Momentum
(c) Density                   
(d) Speed
Ans. (a)
6. If three moles of an ideal gas are compressed to half the initial volume at a constant temperature of 300 k, the amount of work done is:
(a) -5188 J                    
(b) 5000 J
(c) 5188 J                     
(d) -5000 J
Ans. (a)
7. A telescope consists of two lenses of focal length 10 cm and 1 cm. Calculate the length of the telescope, when an object is kept at a distance of 60 cm from the objective then the final image is formed art least distance of distinct vision:
(a) 15.05 cm                 
(b) 12.96 cm
(c) 13.63 cm                 
(d) 14.44 cm
Ans. (b)
8. The centre of mass of a system cannot change its state of motion, unless there is an external force acting on it. Yet the internal force of the brakes can bring a car to rest, Then:
(a) the brakes stop the vehicle
(b) the friction between brake pads and the wheel stops the car
(c) the car is stopped by the road
(d) the car is stopped by the driver pressing the pedal
Ans. (c)
9. If the momentum of a body remains constant, then the mass-speed graph of the body is a:
(a) circle
(b) straight line
(c) rectangular hyperbola
(d) parabola
Ans. (c)
10. If a compressed string is dissolved in acid :
(a) the energy of the string increases
(b) the energy of  the acid decreases
(c) the kinetic energy and potential energy of the acid molecules increases
(d) the temperature of the acid increases
Ans. (c)
For More Question Paper B. Pharma - Click Here