KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 4 - 6 of 268

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Question number: 4

» Thermodynamics » Work in Thermodynamic Process and PV Diagrams

Appeared in Year: 2010

MCQ▾

Question

An ideal gas is made to undergo a cycle depicted by the PV diagram alongside. The curved line from A to B is an adiabatic.

A cycle depicted by the PV diagram

A Cycle Depicted by the PV Diagram

In figure a PV diagram of a cycle in which an idea gas is made is shown. The curved line from A to B is an adiabatic.

Then –

Choices

Choice (4) Response

a.

The efficiency of this cycle is given by unity as no heat is released during the cycle

b.

Heat is absorbed in the upper part of the straight line path and released in the lower part

c.

If T1 and T2 are the maximum and minimum temperatures reached during the cycle, then the efficiency is given by 1T2T1

d.

The cycle can only be carried out in the reverse of the direction shown in figure

Question number: 5

» Gravitation » Kepler's Laws of Planetary Motion

Appeared in Year: 2010

MCQ▾

Question

A comet (assumed to be in an elliptical orbit around the sun) is at a distance of 0.4 AU from the sun at the perihelion. If the time period of the comet is 125 years, what is the aphelion distance? AU: Astronomical Unit.

Choices

Choice (4) Response

a.

24.6 AU

b.

25 AU

c.

49.6 AU

d.

50 AU

Question number: 6

» Center of Mass » Centre of Mass of a Two-Particle System

Appeared in Year: 2010

MCQ▾

Question

Two masses m1 and m2 are connected by a massless spring of spring constant k and unstreched length l. The masses are placed on a frictionless straight channel – which we consider our x-axis. They are initially at rest at x = 0 and x = l, respectively. At t = 0, a velocity of v0 is suddenly imparted to the first particle. At a later time t0, the centre of mass of the two masses is at –

Choices

Choice (4) Response

a.

x=m2lm1+m2+m1v0tm1+m2

b.

x=m2lm1+m2+m2v0tm1+m2

c.

x=m1lm1+m2+m2v0tm1+m2

d.

x=m2lm1+m2

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