NEET Physics: Questions 339  342 of 2142
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Question number: 339
» Kinematics » Average Speed and Instantaneous Velocity
Question
A swimmer who can swim in a river with speed mv (with respect to still water) where v is the velocity of river current, jumps into the river from one bank to cross the river. Then
Select the correct answers and mark it according to the following codes:
(1) If m < 1 he cannot cross the river
(2) If m < 1 he cannot reach a point on other bank directly opposite to his starting point.
(3) If m > 1 he can reach a point on other bank
(4) He can reach the other bank at some point, whatever be the value of m.
Choices
Choice (4)  Response  

a.  1 and 2 are correct 

b.  1, 2 and 3 are correct 

c.  2 and 4 are correct 

d.  1 and 3 are correct 

Question number: 340
» Kinematics » Uniform and NonUniform Motion
Question
A block of metal weighing 2 kg is resting on a frictionless plane. It is stick by a jet releasing water at a rate of 1 kg/s and at a speed of 5 m/s. The initial acceleration of the block will be –
Choices
Choice (4)  Response  

a.  0 

b.  2.5 m/s ^{2} 

c.  0.4 m/s ^{2} 

d.  5 m/s ^{2} 

Question number: 341
» Electrostatics » Electric Field
Question
Figure shows the electric lines of force emerging from a charged body. If the electric field at A and B are E _{A} and E _{B} respectively and if the distance between them is r then
Choices
Choice (4)  Response  

a.  E _{A} > E _{B} 

b. 


c. 


d.  E _{A} < E _{B} 

Question number: 342
» Electrostatics » Electrostatic Potential Energy
Question
Two equal charges q are placed at a distance of 2a and a third charge 2q is placed at the midpoint. The potential energy of the system is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

