KVPY Stream SBSX (Class 12 & 1st Year BSC) Physics: Questions 56  59 of 268
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Question number: 56
» Thermodynamics » Measurement of Temperature
Appeared in Year: 2012
Question
A cylindrical steel rod of length 0.10 m and thermal conductivity 50 Wm^{1}K^{1} is welded end to end to copper rod of thermal conductivity 400 Wm^{1}K^{1} and of the same area of cross section but 0.20 m long. The free end of the steel rod is maintained at 100^{0}C and that of the copper rod at 0^{0}C. Assuming that the rods are perfectly insulated from the surrounding the temperature at the junction of the two rods is
Choices
Choice (4)  Response  

a.  50^{0} C 

b.  20^{0} C 

c.  40^{0} C 

d.  30^{0} C 

Question number: 57
» Atoms and Nuclei » Radioactive Decay Law
Appeared in Year: 2012
Question
A radioactive nucleus A has a single decay mode with halflife τ_{A}. Another radioactive nucleus B has two decay modes 1 and 2. If decay mode 2 were absent, the halflife of B would have been . If decay mode 1 were absent, the half – life of B would have been . If the actual half – life of B is , then the ratio is –
Choices
Choice (4)  Response  

a. 


b.  1 

c. 


d. 


Question number: 58
» Current Electricity » Electrical Resistance
Appeared in Year: 2011
Question
The Quantum Hall Resistance R_{H} is a fundamental constant with dimensions of resistance. If h is Planck’s constant and e the electron charge, then the dimension of R_{H} is the same as 
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 59
» Thermodynamics » Work in Thermodynamic Process and PV Diagrams
Appeared in Year: 2011
Question
One mole of an ideal gas at initial temperature T, undergoes a quasistatic process during which the volume V is doubled. During the process the internal energy U obeys the equation , where a is a constant. The work done during this process is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

