MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions for Physics

10 One mole of a van der Waals' gas obeying the equation `("P" + "a"/"V"^2)`(V - b) = RT undergoes the quasi-static cyclic process which is shown in the P-V diagram. The net heat absorbed by the gas in this process is ______

The moment of the couple is independent of ______

Let σ and b be Stefan's constant and Wien's constant respectively, then dimensions of σb are ______.

The force 'F' acting on a body of density 'd' are related by the relation F = `"y"/sqrt"d"`. The dimensions of 'y' are ______.

A black rectangular surface of area 'A' emits energy 'E' per second at 27 °C. If length and breadth are reduced to `1/2` of initial value and 2 temperature is raised to 327 °C then energy emitted per second becomes ______.

The maximum wavelength of radiation emitted by a star is 289.8 nm. Then intensity of radiation for the star is ______. 
(Given: Stefan's constant= 5.67 x 10^-8 Wm^-2 K^-4, Wien's constant, b = 2898 µ mK).

Two spherical blackbodies have radii 'r₁' and 'r₂'. Their surface temperature are 'T₁' and 'T₂'. If they radiate same power, then `"r"_2/"r"_1` is ________.

One blackbody at temperature T is surrounded by another blackbody at temperate T₁ (T₁ < T). At T, the radiation emitted by inner blackbody per unit area per second is proportional to ____________.

A mass of 20 kg is suspended from a rope wound on a wheel of diameter 80 cm. The torque about the axis of rotation is ______.

The SI unit and dimensions of Stefan's constant cr in case of Stefan's law of radiation is ______.

A rod I m long is acted upon by a couple as shown in the figure. The moment of couple is τ Nm. If the force at each end of the rod, then magnitude of each force is ______.
(sin 30° = cos 60° = 0.5)

If temperature of black body increases from  17°C to 307°C, then the rate of radiation increases by ______.

An ideal gas occupies a volume 'V' at a pressure 'P' and absolute temperature T. The mass of each molecule is 'm'. If 'Ks' is the Boltzmann's constant, then the density of gas is given by expression ______.

A black rectangular surface of area A emits energy E per second at 27°C. If length and breadth is reduced to `(1/3)^("rd")` of initial value and temperature is raised to 327°C then energy emitted per second becomes ______.

Let '`sigma`' and 'b' be Stefan's cosntant and Wien's constant respectively, then dimensions of '`sigmab`' are ______.

For a heat engine operating between temperatures t₁ °C and t₂ °C, its efficiency will be ______.

Let η₁ is the efficiency of an engine at T₁ = 447°C and T₂ = 147°C while η₂, is the efficiency at T₁ = 947°C and T₂ = 47°C. The ratio `eta_1/eta_2` will be ______.

An ideal gas has pressure 'p' volume 'V' and absolute temperature 'T'. If 'm' is the mass of each molecules and 'K' is the Boltzmann constant, then density of the gas is ______.

At 273°C, the emissive power of a perfectly black body is R. What is its value at 0°C?

A rain drop of radius 0.4 mm has a terminal velocity in air 4 m/s. If the coefficient of viscosity of air is 1.8 x 10^-4 poise, the viscous drag on the rain drop will be ____________.