11.

Infinite number of bodies, each of mass 2 kg are situated on x-axis at distance 1m, 2 m, 4 m, 8 m, respectively from the origin. The resulting gravitational potential due to this system at the origin will be

• -G

• 
• 
• 

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

• Length = 50 cm, diameter = 0.5 mm

• Length = 100 cm, diameter = 1 mm

• Length = 200 cm, diameter = 2 mm

• Length = 200 cm, diameter = 2 mm

The wettability of a surface by a liquid depends primarily on

• viscosity

• surface tension

• density

• density

The molar specific heats of an ideal gas at constant pressure and volume are denoted by C_P and C_V respectively. If  and R is the universal gas constant, then C_V is equal to

The piece of iron is heated in a flame. If first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using,

• Stefan's law

• Wien's displacement law

• Kirchoff's law

• Kirchoff's law

A gas is taken through the cycle A → B → C → A, as shown, What is the net work done by the gas?

• 2000 J

• 1000 J

• Zero

• Zero

During an adiabatic process, the pressure of a gas found to be proportional to the cube of its temperature. The ratio of C_p/C_v for the gas is

• 4/3

• 2

• 5/3

• 5/3

In the given (V-T )diagram, what is the relation between pressures p₁ and p₂?

• p₂ =p₁

• p₂>p₁

• p₂<p₁

• p₂<p₁

The amount of heat energy required raising the temperature of 1g of helium at NTP, from T₁K and T₂K is

• 3/8 N_aK_B(T₂-T₁)

• 3/2 N_aK_B(T₂-T₁)

• 3/4 N_aK_B(T₂-T₁)

• 3/4 N_aK_B(T₂-T₁)

A wave travelling  in the positive x- direction having displacement along y- direction as 1 m, wavelength 2π m and frequency of 1/π Hz is represented by

• y = sin(x-2t)

• y= sin (2πx-2πt)

• y= sin (10πx-20πt)

• y= sin (10πx-20πt)