Laws of Motion (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 19  23 of 116
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Question number: 19
» Laws of Motion » Force and Inertia
Question
A swimmer can swim in still water at a rate 4 km/h. If he swims in a river flowing at 3 km/h and keeps his direction (w. r. t. water) perpendicular to the current. Find his velocity w. r. t. the ground.
Choices
Choice (4)  Response  

a.  3 km/hr 

b.  7 km/hr 

c.  5 km/hr 

d.  4 km/hr 

Question number: 20
» Laws of Motion » Newton's Law » Newton's Third Law of Motion
Assertion (Ꭺ)
A cloth covers a table. Some dishes are kept on it. The cloth can be pulled out without dislodging the dishes from the table.
Reason (Ꭱ)
To every action there is an equal and opposite reaction.
Choices
Choice (4)  Response  

a.  Ꭺ is false but Ꭱ is true 

b.  Ꭺ is true but Ꭱ is false 

c.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

d.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

Question number: 21
» Laws of Motion » Momentum
Question
A force of 4 N is applied on a particle for 3 sec, the change in momentum will be 
Choices
Choice (4)  Response  

a.  4 Ns 

b.  6 Ns 

c.  12 Ns 

d.  3 Ns 

Question number: 22
» Laws of Motion » Force and Inertia
Question
A cane filled with water is revolved in a vertical circle of diameter 2 m and the water does not fall down n maximum period of revolution must be –
Choices
Choice (4)  Response  

a.  14.15 

b.  4.02 

c.  1.45 

d.  2.006 

Question number: 23
» Laws of Motion » Force and Inertia
Question
A stone of mass 1 kg tied to a light inextensible string of length L = 10/3 m is whirling in a circular path of radius L in a vertical plane. If the ratio of the maximum tension in the string to the minimum tension in the suing is 4 and if g is taken to be 10m/sec2, the speed of the stone at the highest point of the circle is
Choices
Choice (4)  Response  

a.  10√3m/Sec 

b.  10 m/sec 

c.  20 m/sec 

d.  5√2m/sec 
