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JEE Main/Advanced 2008 Physics Answer Key

ANSWERS


	

		

			

			
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2) 3
			
			

			
3) none
			
			

			
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5) 4
			
			

			
6) 2
			
			

			
7) 2
			
			

			
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10) 3
			
			

			
11) 3
			
			

			
12) 1
			
		
		

			

			
13) 4
			
			

			
14) 2
			
			

			
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16) 3
			
		
		

			

			
17) 1
			
			

			
18) 3
			
			

			
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20) 3
			
		
		

			

			
21) 1
			
			

			
22) 3
			
			

			
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26) 1
			
			

			
27) 2
			
			

			
28) 3
			
		
		

			

			
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30) 4
			
			

			
31) 4
			
			

			
32) 3
			
		
		

			

			
33) 4
			
			

			
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35) 4
			
			
 
		
	


1.    

Momentum = mass x velocity

Momentum = 3.513 x 5.00 = 17.565 kg m sec-1

Momentum in three significant digit = 17.6 kg m sec-1

 

2.    

Moment of Inertia of a body is the inertia of a rotating body with respect to the axis of rotation.

Moment of Inertia of the square plate at the center of the axis (vertical axis) = ma2/6

Moment Inertia at the axis passing through corner = Icenter + m d2 = ma2 + m(a/√2)2 = 2/3 ma2

 

3.    

        Speed of the sound in gas

        V = √(γRT/m)

        R = gas constant(8.314 J/mol K)

T = the absolute temperature

M = the molecular weight of the gas (kg/mol)

g = adiabatic constant = cp/cv

gO2 = 7/5

gHe = 5/3

MO2 = 32

MHe = 4

460 = √(7RT/5x32)                       ...... (i)

VHe = √(5RT/3x4)                         ...... (ii)

By solving (i) and (ii) VHe = 1419 m sec-1

 

 

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