KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 66 - 68 of 268

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Question number: 66

» Kinetic Theory of Gases » Heat Capacities and Its Relations

Appeared in Year: 2011

MCQ▾

Question

Jet aircrafts fly at altitudes above 30, 000 ft where the air is very cold at – 400C and the pressure is 0.28 atm. The cabin is maintained at 1 atm pressure by means of a compressor which exchanges air from outside adiabatically. In order to have a comfortable cabin temperature of 250C, we will require in addition

Choices

Choice (4) Response

a.

A heater to warm the air injected into the cabin

b.

An air-conditioner to cool the air injected into the cabin

c.

Neither a heater nor an air-conditioner; the compressor is sufficient

d.

Alternatively heating and cooling in the two halves of the compressor cycle

Question number: 67

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

Appeared in Year: 2011

MCQ▾

Question

Due to transitions among its first three energy levels, hydro genic atom emits radiation at three discrete wavelengths λ1, λ2, and λ3. Then

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 68

» Kinematics » Uniform and Non-Uniform Motion

Appeared in Year: 2012

MCQ▾

Question

A ball of mass m suspended from a rigid support by an inextensible massless string is released from a height h above its lowest point. At its lowest point it collides elastically with a block of mass 2m at rest on a frictionless surface. Neglect the dimensions of the ball and the block. After the collision the ball rises to a maximum height of –

A ball suspended from a rigid support

A Ball Suspended From a Rigid Support

In figure a ball of mass m suspended from a rigid support by an inextensible massless string is released from a height h above its lowest point.

Choices

Choice (4) Response

a.

b.

c.

d.

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