NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 71  75 of 2142
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2142 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 550.00 or
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. 
