NEET Physics: Questions 71  75 of 2142
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Question number: 71
» Physics and Measurement » Dimensions of Physical Quantities
Question
The frequency of vibration of string is given by v = [Fm] ^{1/2} Here P is number of segments in the string and l is the length. The dimensional formula for m will be
Choices
Choice (4)  Response  

a.  [M L ^{0 } T ^{1}] 

b.  [M L ^{1} T ^{0}] 

c.  [M ^{0} L T ^{1}] 

d.  [M ^{0 } L ^{0} T ^{0}] 

Question number: 72
» Kinematics » Average Speed and Instantaneous Velocity
Question
the distance between two particles is decreasing at the rate of 6 m/sec. If these particles travel with same speeds and in the same direction, then the separations increase at the rate of 4 m/s. The particles have speeds as
Choices
Choice (4)  Response  

a.  4 m/sec; 1 m/sec 

b.  5 m/sec; 1 m/sec 

c.  4 m/sec; 2 m/sec 

d.  5 m/sec; 2 m/sec 

Question number: 73
» Physics and Measurement » Errors in Measurement
Question
The percentage errors in the measurement of mass and speed are 2 % and 3 % respectively. How much will be the maximum error in the estimation of the kinetic energy obtained by measuring mass and speed?
Choices
Choice (4)  Response  

a.  1% 

b.  5 % 

c.  8 % 

d.  11 % 

Question number: 74
» Physics and Measurement » Accuracy and Precision of Measuring Instruments
Question
The number of significant figures in all the given numbers 25.12, 2009, 4.156 and l. 217 x 10  4 is
Choices
Choice (4)  Response  

a.  2 

b.  3 

c.  4 

d.  1 

Question number: 75
» Kinematics » Motion in a Straight Line
Question
A particle of mass m moves on the xaxis as follows: it starts from rest at t = 0 from the point x  0 and comes to rest at t = 1 at the point x = 1. No other information is available about its motion at intermediate time (0 < t < 1). If a denotes the instantaneous acceleration of the particle, then
Choices
Choice (4)  Response  

a.  A cannot remain positive for all t in the interval 0 < t < l 

b. 
Must be > 4 at some point or points in its path 

c. 
Cannot exceed 2 at any point in its path 

d. 
= 2 at any point in its path. 
