KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 221 - 224 of 268

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Question number: 221

» Gravitation » Gravitational Potential

MCQ▾

Question

Two masses m1 = 10 kg and m2 = 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.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 222

» Atoms and Nuclei » Bohr Model

Appeared in Year: 2015

MCQ▾

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 0.07me, (where me is mass of the electron) and the space in which it moves has a permittivityEquation , 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

MCQ▾

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.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 224

» Kinetic Theory of Gases » Heat Capacities and Its Relations

Appeared in Year: 2014

MCQ▾

Question

One mole of a monoatomic ideal gas is expanded by a process described by Equation 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.

Equation

b.

R

c.

Equation

d.

Equation

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