12th Class Physics Sample Paper

done Physics Olympiad Sample Paper-4 Total Questions - 12    [Download]

• question_answer1)
  A charged particle of mass m and charge q is released from rest in an electric field of constant magnitude E. The kinetic energy of the particle after time t is  
  A)
   \[\frac{{{E}^{2}}{{q}^{2}}{{t}^{2}}}{2m}\]         
  done clear
  B)
   \[\frac{2{{E}^{2}}{{t}^{2}}}{mq}\]
  done clear
  C)
   \[\frac{Eqm}{2t}\]        
  done clear
  D)
  \[\frac{2{{q}^{2}}m}{2{{t}^{2}}}\]
  done clear
  View Answer play_arrow

• question_answer2)
  In the circuit shown in the given figure, the resistances \[{{R}_{1}}\] and \[{{R}_{2}}\] are respectively
  A)
    \[14\,\,\Omega \,\,and\,\,40\,\,\,\Omega \]
  done clear
  B)
   \[40\,\,\Omega \,\,and\,\,14\,\,\,\Omega \]
  done clear
  C)
   \[40\,\,\Omega \,\,and\,\,30\,\,\,\Omega \]
  done clear
  D)
   \[14\,\,\Omega \,\,and\,\,30\,\,\,\Omega \]
  done clear
  View Answer play_arrow

• question_answer3)
  While finding the refractive index of a glass slab, the travelling microscope is focused on ink dot on a white paper at position 4.320 cm. When a glass slab is placed on this ink dot on paper, the microscope is raised through 1.80 cm. The thickness of glass  slab of refractive index \[\frac{3}{2}\]
  A)
   \[\frac{1}{0.8}\,\,cm\]  
  done clear
  B)
   \[2.70\,\,\,cm\]
  done clear
  C)
   \[5.4\,\,cm\]     
  done clear
  D)
   \[1.2\,\,cm\]
  done clear
  View Answer play_arrow

• question_answer4)
  A galvanometer is connected as shown in figure. It has resistance of \[100\,\,\Omega \]. What should be resistance connected to it in parallel so that its deflection is reduced to half? 
  A)
   \[100\,\,\Omega \]                
  done clear
  B)
         \[91\,\,\Omega \]
  done clear
  C)
   \[99\,\,\Omega \]                  
  done clear
  D)
     None of these
  done clear
  View Answer play_arrow

• question_answer5)
  A square loop of wire, side length 10 cm is placed at angle of \[{{45}^{{}^\circ }}\] with a magnetic field that changes uniformly from 0.1 T to zero in 0.7 seconds. The induced current in the loop (its resistance is 1\[\,\Omega \]) is
  A)
   1.0mA        
  done clear
  B)
   2.5mA        
  done clear
  C)
   3.5 mA            
  done clear
  D)
   4.0 mA
  done clear
  View Answer play_arrow

• question_answer6)
  You have been provided with four 400 ohm resistors each. The number of ways in which these can be combined to have different equivalent resistances is
  A)
   Seven different combinations and seven different equivalent resistances
  done clear
  B)
   Eight different combinations and seven different equivalent resistances
  done clear
  C)
   Nine different combinations and eight different equivalent resistances
  done clear
  D)
   Ten different combinations and nine different equivalent resistances.
  done clear
  View Answer play_arrow

• question_answer7)
  A copper wire of length 50.0 cm and total resistance of \[1.1\times {{10}^{-2}}\Omega \] is formed into a circular loop and placed perpendicular to a uniform magnetic field that is increasing at constant rate of \[10.0\text{ }mT/s\]. At what rate is thermal energy generated in the loop?
  A)
   \[1.32\times {{10}^{8}}W\]     
  done clear
  B)
   \[2.36\times {{10}^{-4}}W\] 
  done clear
  C)
   \[3.68\times {{10}^{-6}}W\]
  done clear
  D)
     \[4.23\times {{10}^{-5}}W\]
  done clear
  View Answer play_arrow

• question_answer8)
  A self-propelled vehicle of mass m whose engine delivers a constant power P has an acceleration \[a=\frac{P}{mv}\]What is the distance travelled by it (assuming no friction) to mv increase the velocity of the vehicle from \[V\,\,\,to\,\,{{\,}_{1}}{{V}_{2}}\]?
  A)
    \[x=\frac{3m}{P}(V_{2}^{3}-V_{1}^{3})\]      
  done clear
  B)
   \[x=\frac{m}{3P}(V_{2}^{3}-V_{1}^{3})\]
  done clear
  C)
   \[x=\frac{2m}{P}(V_{2}^{3}-V_{1}^{3})\]
  done clear
  D)
   \[x=\frac{m}{2P}(V_{2}^{3}-V_{1}^{3})\]
  done clear
  View Answer play_arrow

• question_answer9)
  A beam of 450 nm light is incident on a metal having work function 2 eV and placed in a magnetic field B. If the most energetic electrons emitted are bent into circular arc of radius 0.2 m, find 6.
  A)
   \[2.36\text{ }\times \text{ }{{10}^{-4}}\text{ }T~\]
  done clear
  B)
   \[1.46\text{ }\times \text{ }{{10}^{-5}}\text{ }T\]  
  done clear
  C)
   \[6.9\text{ }\times \text{ }{{10}^{-5}}\text{ }T\]
  done clear
  D)
   \[9.2\text{ }\times \text{ }{{10}^{-6}}\text{ }T\]
  done clear
  View Answer play_arrow

• question_answer10)
  Monochromatic light of wavelengths 400 nm and 560 nm are incident simultaneously and normally on double slit apparatus whose slit separation is 0.1 mm and screen distance is 1 m. Distance between areas of total darkness will be
  A)
   \[4\text{ }mm\]            
  done clear
  B)
   \[5.6\text{ }mm\]       
  done clear
  C)
   \[28\text{ }mm\]          
  done clear
  D)
   \[14\text{ }mm\]
  done clear
  View Answer play_arrow

• question_answer11)

  A vessel has 6 g of oxygen at pressure P and temperature 400 K. A small hole is made in it so that oxygen leaks out. How much oxygen leaks out if the final pressure is \[P/2\]and temperature 300 K?

  A)
   5g                   
  done clear
  B)
   4g       
  done clear
  C)
   2 g                  
  done clear
  D)
   3g
  done clear
  View Answer play_arrow

• question_answer12)
  A conducting circular loop of radius a and resistance R is kept on a horizontal plane. A vertical time varying magnetic field B =2t is switched on at time t = 0. Then
  A)
   Flow of charge per unit time from any section of the coil is constant
  done clear
  B)
   Total charge passed through any section between time \[t=0\,\,\,to\,\,\,t=\,\,\,2\,\,\,is\,\,\left( \frac{4\pi {{a}^{2}}}{R} \right)\]
  done clear
  C)
   Power generated in the coil at any time t is constant 
  done clear
  D)
   All of these
  done clear
  View Answer play_arrow