KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SBSX (Class 12 & 1st Year B.Sc.) Physics: Questions 72  75 of 268
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Question number: 72
» Experimental Skills » Speed of Sound in Air
Appeared in Year: 2012
Question
The ratio of the speed of sound to the average speed of an air molecule at 300K and 1 atmospheric pressure is close to,
Choices
Choice (4)  Response  

a.  400 

b. 


c.  1 

d. 


Question number: 73
» Thermodynamics » Work in Thermodynamic Process and PV Diagrams
Appeared in Year: 2012
Question
An ideal monatomic gas expands to twice its volume. If the process is isothermal, the magnitude of work done by the gas is W_{i}. If the process is adiabatic the magnitude of work done by the gas is W_{a}. Which of the following is true,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 74
» Work, Energy and Power » Elastic and Inelastic Collisions
Appeared in Year: 2011
Question
An electron collides with free molecules initially in its ground state. The collision leaves the molecules in an excited state that is metastable and does not decay to the ground state by radiation. Let K be the sum of the initial kinetic energies of the electron and the molecule, and P the sum of their initial momenta. Let K’ and P’ represent the same physical quantities after the collision. Then –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 75
» Magnetic Effects of Current and Magnetism » Biot  Savart Law
Appeared in Year: 2012
Question
A loop carrying current Ι has the shape of a regular polygon of n sides. If R is the distance from the centre to any vertex, then the magnitude of the magnetic induction vector at the centre of the loop is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

