KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SBSX (Class 12 & 1st Year B.Sc.) Physics: Questions 221  224 of 268
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 268 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 200.00 or
Question number: 221
» Gravitation » Gravitational Potential
Question
Two masses m_{1} = 10 kg and m_{2} = 810 kg are held 2 m apart. At a point P on the line joining them is the gravitational field equal to zero. The gravitational potential at that point is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 222
» Atoms and Nuclei » Bohr Model
Appeared in Year: 2015
Question
A donor atom in a semiconductor has a loosely bound electron. The orbit of this electron is considerably affected by the semiconductor material but behaves in many ways like an electron orbiting a hydrogen nucleus. Given that the electron has an effective mass of 0.07m_{e}, (where m_{e} is mass of the electron) and the space in which it moves has a permittivity, then the radius of the electron’s lowermost energy orbit will be close to (The Bohr radius of the hydrogen atom is 0.53 Å)
Choices
Choice (4)  Response  

a.  10 Å 

b.  100 Å 

c.  243 Å 

d.  0.53 Å 

Question number: 223
» Properties of Solids & Liquids » Application of Surface Tension
Question
A air bubble is formed at the bottom of a lake. When the bubble rises to the surface, its radius increases 4 times. The depth of the lake at that spot is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 224
» Kinetic Theory of Gases » Heat Capacities and Its Relations
Appeared in Year: 2014
Question
One mole of a monoatomic ideal gas is expanded by a process described by where C is a constant. The heat capacity of the gas during the process is given by (R is the gas constant).
Choices
Choice (4)  Response  

a. 


b.  R 

c. 


d. 

