NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 443  447 of 2184
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Question number: 443
» Laws of Motion » Force and Inertia
Question
The roadway bridge over a canal is the form of an arc of a circle of radius 25 m. What is the minimum speed with which a car can cross the bridge without leaving contact with the ground at the highest point (g = 9.8 m/s ^{2})
Choices
Choice (4)  Response  

a.  17.556 m/s 

b.  39.899 m/s 

c.  49.49 m/s 

d.  45.76 m/s 

Question number: 444
Question
An automobile engine develops 100 kW when rotating at a speed of 1500 rev/min. What torque does it deliver?
Choices
Choice (4)  Response  

a.  531 Nm 

b.  350 Nm 

c.  440 Nm 

d.  637 Nm 

Question number: 445
» Electrostatics » Electric Potential
Question
A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then electric field at Q is proportional to
Choices
Choice (4)  Response  

a.  p and r ^{2} 

b.  p ^{1 } and r ^{2} 

c.  P ^{2} and r ^{3} 

d.  p and r ^{3} 

Question number: 446
Question
A torque of 20 Nm is applied on a 5 kg wheel whose moment of inertia is 2kgm ^{2} for 10 sec. The angle covers by the wheel in 10 sec will be
Choices
Choice (4)  Response  

a.  750 rad 

b.  500 rad 

c.  3000 rad 

d.  6000 rad 

Question number: 447
» Communication System » Need for Modulation
Question
Students I, II and III perform an experiment for measuring the acceleration due to gravity (g) using a simple pendulum. They use different lengths of the pendulum and/or record time for different number of oscillations. The observations are shown in the table. Least count for length = 0.1 cm
Student  Length of the pendulum (cm)  No. of oscillations (n)  Total time for (n) oscillations (s)  Time Period (s) 
I  64.0  8  128.0  16.0 
II  64.0  4  64.0  16.0 
III  20.0  4  36.0  9.0 
If E _{I}, E _{II} and E _{III} are the percentage errors in g, i. e. , ( for students, I, II and III, respectively, then
Choices
Choice (4)  Response  

a.  E _{I} is minimum 

b.  E _{II} is maximum 

c.  E _{I } = 0 

d.  E _{I} = E _{II} 
