Important Question Gujarat CET Medical

1. A transparent bag filled with air forms a concave lens. Now, if this bag is completely immersed in water, then it behaves as
(a) divergent lens                                               
(b) convergent lens     
(c) Equilateral prism                                          
(d) rectangular slab
Ans. (b)
2. A microscope is focused on an ink mark on the top of a table. If we place a glass slab of 3 cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass slab is 1.5
(a) 2 cm upwards                                                   
(b) 2 cm downwards
(c) 1 cm upwards                                                     
(d) 1 cm downwards
Ans. (c)
3. A Young’s Double slit set up for interference is shifted from air to within water, then the fringe width
(a) Becomes infinite                                                
(b) decreases
(c) Increases                                                                 
(d) remain unchanged
Ans. (b)
4. A magnetic wire of dipole moment 4πAm² is bent in the form of semi-circle. The new magnetic moment is
(a) 4πAm²                                                                
(b) 8πm²
(c) 4Am²                                                                   
(d) None of these
Ans. (d)
5. Reverse bias applied to p-n junction diode
(a) Lowers the potential barrier
(b) Decreases the majority of charge carriers
(c) Raises the potential barrier
(d) Change the mass of p-n junction diode
Ans. (c)
6. The Gaussian surface for calculating the electric field due to a charge distribution is
(a) any surface near the charge distribution                                                        
(b) always a spherical surface
(c) a symmetrical closed surface containing the charge distribution, at every point of which electric field has a single field value
(d) None of the given options
Ans. (c)
7. The resistance of a ideal voltmeter is
(a) Zero                                            
(b) Greater than zero but a finite value
(c) Infinite                                        
(d) 5000Ω
Ans. (c)
8. Resultant force acting on a diamagnetic material in a magnetic field is in direction
(a) from stronger to the weaker part of the magnetic field                                  
(b) from weaker to the stronger part of the magnetic field
(c) perpendicular to the magnetic field
(d) in the direction making angle 60  to the magnetic field
Ans. (a)
9. Resultant force acting on a diamagnetic material in a magnetic field is in direction
(a) from stronger to the weaker part of the magnetic field                                  
(b) from weaker to the stronger part of the magnetic field
(c) perpendicular to the magnetic field
(d) in the direction making angle 60  to the magnetic field
Ans. (a)
10. What is the self inductance of a solenoid of length 31.4 cm,area of cross section m² and total number of turns ?
(a) 4mH                                                     
(b) 4H
(c) 40H                                                      
(d) 0.4H
Ans. (a)
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