All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2009 Physics

Q.24. The transition from the state n = 4 to n = 3 in hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from:

Sol:     Energy of I – R radiation < energy of U – V radiation

Answer: (1)

This question contains Statement-1 and Statement -2. Of the four choices given after the statements, choose the one that best describes the two statements.

 Q.26. Statement –1: The temperature dependence of resistance is usually given as . The resistance of a wire changes from 100  to 150  when its temperature is increased from 270C to 2270C. This implies that

Statement –2:  is valid only when the change in the temperature T is small and .

1. Statement –1 is false, Statement- 2 is true
   
   
2. Statement –1 is true, Statement- 2 is false
   
   
3. Statement –1 is true, Statement- 2 is true; Statement -2 is the correct explanation for Statement-1
   
   
4. Statement –1 is true, Statement- 2 is true; Statement -2 is not the correct explanation for Statement-1

Answer: (1)

Q.27. Two wires are made of the same material and have the same volume. However wire 1 has cross-sectional area A and wire 2 has cross-sectional area 3A. If the length of wire 1 increases by x on applying force F, how much force is needed to stretch wire 2 by the same amount?

1. 9 F
2. F
3. 4 F
4. 6 F

Sol:    

Answer: (1)

 Directions: Question numbers 58 and 59 are based on the following paragraph

A current loop ABCD is held fixed on the plane of the paper as shown in the figure. The arcs BC (radius = b) and DA (radius =a) of the loop are joined by two straight wires AB and CD. A steady current I is flowing in the loop. Angle made by AB and CD at the origin O is 300. Another straight thin wire with steady current I1 flowing out of the plane of the paper is kept at the origin.