MCQs JEE Advances 

1. Parallel rays of light of intensity I = 912 Wm-2 are incident on a spherical black body kept in surroundings of temperature 300 K. Take Stefan constant 𝜎 = 5.7 x 10-8 Wm-2 K-4 and assume that the energy exchange with the surroundings is only through the radiation. The final steady state temperature of the black body is close to 
(a) 330 K                                                              
(b) 660 K
(c) 990 K                                                              
(d) 1550 K                                                                
Ans (a)
2.  A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are u1 and u2 respectively. If the ratio u1 : u2 = 2 : 1 and hc = 1240 eV nm, the work function of the metal is nearly  
(a) 3.7 eV                                                            
(b) 3.2 eV
(c) 2.8 eV                                                            
(d) 2.5 eV                                                             
Ans (a)
3. Consider the partition to be rigidly fixed so that it does not move. When equilibrium is achieved, the final temperature of the gasses will be
(a) 550 K                                                              
(b) 525 K
(c) 513 K                                                              
(d) 490 K                                                                
Ans (d)
4. Now consider the partition to be free to move without friction so that the pressure of gasses in both compartments is same. Then total work done by the gasses till the time they achieve equilibrium will be
(a) 250R                                                               
(b) 200R
(c) 100R                                                               
(d) -100R                                                             
Ans (d)
5. If the piston is pushed out at a speed of 5 mms-1 the air comes out of the nozzle at the speed of
(a) 0.1 ms-1                                                         
(b) 1 ms-1
(c) 2 ms-1                                                                                            
(d) 8 ms-1                                                              
Ans (c)
6. Assuming 2s-2p mixing is not operative, the paramagnetic species among the following is
(a) Be2                                                                   
(b) B2
(c) C2                                                                    
(d) N2                                                                     
Ans (c)
7. The product formed in the reaction of SOCl2 with white phosphorus is
(a) PCl3                                                                
(b) SO2Cl2
(c) SCl2                                                                 
(d) POCl3                                                                  
Ans (a)
8.  Hydrogen peroxide in its reaction with KIO4 and NH2OH respectively, is acting as a
(a) reducing agent, oxidizing agent
(b) reducing agent, reducing agent
(c) oxidizing agent, oxidizing agent
(d) oxidizing agent, reducing agent                     
Ans (a)
9. The experimental value of d is found to be smaller than the estimate obtained using Graham’s law. This due to
(a) larger mean free path for X as compared of that of Y
(b) larger mean free path for Y as compared of that of Y
(c) increased collision frequency of Y with the inert gas as compared to that of X with the inert gas
(d) increased collision frequency of X with inert gas as compared to that of Y with the inert gas         
Ans (d)
10.  The correct statement with respect to product Y is
(a) It gives a positive Tollen’s test and is a functional isomer of X
(b) It gives a positive Tollen’s test and is a geometrical isomer of X
(c) It gives a positive iodoform test and is a functional isomer of X
(d) It gives a positive iodoform test and is a geometrical isomer of X                                                       
Ans (c)
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