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11th Physics Monthly Test - 1 ( Properties of Matter )

MABS Institution

11th Physics Monthly Test - 1 ( Properties of Matter )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

An air bubble of diameter 4 mm rises steadily through a solution of density 1500 kgm²³ at the rate of 30cm^-1 the coefficient of viscosity of the solution is

3.3 x 10^-3 poise
2.2 x 10^-3 poise
3.3 x 10^-3 poise
4.4 x 10^-3 poise

If there were no gravity, which oftbe following will not be there for a fluid?

viscosity
surface tension
pressure
archimedes upward thrust

Two drops of equal radius coalesce to form a bigger drop. What is ratio of surface energy of bigger drop to smaller one?

2^1/2:1
1:1
2^2/3:1
none of these

When the distance between the two atoms becomes '\(\gamma_{0}\)' then the inter atomic force will be,

Zero
Infinity
Negative constant
Positive constant

The Young’s modulus for a perfect rigid body is

0
1
0.5
infinity

Ablack body is continuously radiating ene.rlD' at a temperature of 2880 k if U₁ U₂ and U₃ are the amount of radiation measured between the wavelengths 599 & 600 nm, 999 & 1000 nm & 1499& 1500nin respectively then (wiresconstant b = 2.88 x 10²⁶ kmk)

U₂ < U₃
U₁=U₂=U₃
U₁23
U₂>U₁>U₃

If a liquid does not wet glass, its angle of contact is

zero
acute
obtuse
right angle

Amount of energy required to change liquid to gas and vice versa without any change in temperature is termed as

Latent Heat and Fusion
Latent Heat of Yaporis ation
Heat capacity
Specific heat capacity

Which of the following is dynamic viscosity.

[M¹L¹T^-1]
[M¹L^-1T^-1]
[M¹L^-2T^-2]
[M¹L^-2T^-2]

If a wire is stretched to double of its original length, then the strain in the wire is

1
2
3
4

Part - B

Generic 2 - Answer All Question

Define coefficient of viscosity of a liquid.

The poisson ratio of a material is 0.5 if a force is applied to a wire of this material, there is a decrease in the cross sectional area by 4% what is the percentage increases in the length.

Which one of these is more elastic, steel or rubber? Why?

Write down the expression for the Stoke’s force and explain the symbols involved in it.

How is surface tension related to surface energy?
Define surface tension of a liquid. Mention its S.I unit and dimension.

Define angle of contact for a given pair of solid and liquid.

Why are springs made of steel & not of copper?

A metallic wire is stretched by suspending weight from it if a is the longitudinal strain & y is the young's modulus, show that elastic potential energy per unit volume is given by \(\frac{1}{2}y^{2}{\alpha}\).

What is the nature of intermolecular forces?

Part - C

Generic 3 - Answer All Question

Write any three applications of viscosity.

Two pistons of a hydraulic lift have diameters of 60 cm and 5 cm. What is the force exerted by the larger piston when 50 N is placed on the smaller piston?

Mercury has an angle of contact equal to 140° with soda lime glass. A narrow tube of radius 2 mm, made of this glass is dipped in a trough containing mercury. By what amount does the mercury dip down in the tube relative to the liquid surface outside?. Surface tension of mercury T=0.456 N m^-1; Density of mercury \(\rho\) = 13.6 × 10³ kg m^-3

Let 2.4×10⁻⁴ J of work is done to increase the area of a film of soap bubble from 50 cm² to 100 cm². Calculate the value of surface tension of soap solution.

A solid sphere has a radius of 1.5 cm and a mass of 0.038 kg. Calculate the specific gravity or relative density of the sphere.

How do you differentiate solid liquid & gas?
A body floats in water with 40% of its volume outside water. When the same body floats in oil 60% of its volume, remains outside oil. What is the relative density of the oil?

Explain why:
(a) a body with large reflectivity is a poor emitter.
(b) a brass tumbler feels much colder than wooden tray on a chilly day.

Water rises in a capillary tube to a height of 2.0cm. How much will the water rise through another capillary tube whose radius is one-third of the first tube?

A cube of wood floating in water supports a 300 g mass at the centre of its top face. When the mass is removed, the cube rises by 3 cm. Determine the volume of the cube.

Part - D

Generic 5 - Answer All Question

What is capillarity? Obtain an expression for the surface tension of a liquid by capillary rise method.

Describe the construction and working of venturimeter and obtain an equation for the volume of liquid flowing per second through a wider entry of the tube

State and prove Bernoulli’s theorem for a flow of incompressible, non-viscous, and streamlined flow of fluid.

Derive Poiseuille’s formula for the volume of a liquid flowing per second through a pipe under streamlined flow.

Two spherical soap bubble coalesce. If V be the change in volume of the contained air, A is the change in total surface area then show that 3PV + 4AT = 0 Where T is the surface tension and P is atmospheric pressure.

Obtain an equation of continuity for a flow of fluid on the basis of conservation of mass.
State and prove Pascal’s law in fluids.

Write the applications of surface tension?

Derive an expression for the elastic energy stored per unit volume of a wire.

Write the Applications of elasticity.

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