KVPY Stream SBSX (Class 12 & 1st Year BSC) Physics: Questions 20  22 of 250
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Question number: 20
» Kinematics » Uniform and NonUniform Motion
Appeared in Year: 2010
Question
A ball is dropped vertically from a height of h onto a hard surface. If the ball rebounds from the surface with a fraction r of the speed with which it strikes the latter on each impact, what is the net distance traveled by the ball up to the 10^{th} impact?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 21
» Thermodynamics » Measurement of Temperature
Appeared in Year: 2011
Question
Two rods, one made of copper and the other steel of the same length and cross sectional area are joined together. (The thermal conductivity of copper is 385 J s^{–1} m ^{–1} K^{1} and steel is 50 J s^{–1} m^{ –1}K^{–1}) If the copper end is held at 100^{0}C and the steel end is held at 0^{0}C, what is the junction temperature (assuming no other heat losses)?
Choices
Choice (4)  Response  

a.  88^{0}C 

b.  12^{0}C 

c.  50^{0}C 

d.  73^{0}C 

Question number: 22
» Gravitation » Universal Law of Gravitation
Appeared in Year: 2010
Question
A certain planet completes one rotation about its axis in time T. The weight of an object placed at the equator on the planet’s surface is a fraction f (f is close to unity) of its weight recorded at a latitude of 60^{0}. The density of the planet assumed to be a uniform perfect sphere is given by –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

