AIIMS (All India Institute of Medical Sciences) Physics: Questions 297  302 of 500
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Question number: 297
» Work, Energy and Power » Kinetic Energy
Question
A V – shape is created by joining two same sized roads. The angle between two rods is . If this system is rotating about a line passing through their ends which are joined and perpendicular to their plane, then the work done (W) is –
Choices
Choice (4)  Response  

a.  W is independent of . 

b.  Maximum for 

c.  Maximum for 

d.  Maximum for 

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Question number: 298
» Electromagnetic Induction & Alternating Currents » Alternating Currents
Question
In an A. C. circuit containing only inductor, the voltage –
Choices
Choice (4)  Response  

a.  Leads the current by 180° 

b.  Leads the current by 90° 

c.  Lags the current by 90° 

d.  Remains in phase with the voltage 

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Question number: 299
» Experimental Skills » Speed of Sound in Air
Question
The speed of sound in a gas at S. T. P. is and the density of the gas is . Find the number of degrees of freedom of a molecule of the gas.
Choices
Choice (4)  Response  

a.  6 

b.  5 

c.  3 

d.  4 

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Question number: 300
» Work, Energy and Power » Kinetic Energy
Question
Two bodies with kinetic energies in the ratio of are moving with equal linear momentum. The ratio of their masses is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 301
» Atoms and Nuclei » Half Life and Mean Life
Question
A radioactive substance decays to of its initial activity in 20 days. The halflife of the radioactive substance expressed in days is –
Choices
Choice (4)  Response  

a.  2 

b.  6 

c.  8 

d.  12 

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Question number: 302
» Communication System » Sky and Space Wave Propagation
Question
For sky wave propagation of a 18 MHz signal, what should be the minimum electron density in ionosphere –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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