NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 348  351 of 2184
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Question number: 348
Question
There is an air filled l pF parallel plate capacitor. When the plate separation is doubled and the space is filled with wax, the capacitance increases to 2pF. The dielectric constant of wax is
Choices
Choice (4)  Response  

a.  YO 8 

b.  6 

c.  2 

d.  4 

Question number: 349
» Laws of Motion » Force and Inertia
Question
A cricket ball of mass 250 gm moving with a velocity of 25 m/s is hit by a bat so that it acquires a velocity of 30 m/s in the opposite direction. The force acting on the ball, if the contact time is 1/100 of a second, will be 
Choices
Choice (4)  Response  

a.  632.5 N in the initial direction of ball 

b.  130 N in the final direction of ball 

c.  1.345 N in the initial direction of ball 

d.  1300 N in the final direction of ball 

Question number: 350
Question
In the figure a capacitor is filled with dielectrics K _{1}, K _{2 } and K _{3}. The resultant capacitance is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  None of the above 

Question number: 351
» Rotational Motion » Angular Momentum
Question
If the earth is a point mass of 6 x l0 ^{24 } kg revolving around the sun at a distance of 1.5xl0 ^{8} km and in time T = 3.14 xl0 ^{7} s. Then the angular momentum of the earth around the sun is
Choices
Choice (4)  Response  

a.  1.5 x 10 ^{37} kg m ^{2} /s 

b.  2.7 x 10 ^{40} kg m ^{2} /s 

c.  1.8 x 10 ^{29} kg m ^{2} /s 

d.  1.2 x 10 ^{18} kg m ^{2} /s 
