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

MABS Institution

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

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The work done against surface tension in blowing a soap bubble from a radjus of 5 cm to 15 cm is (surface tension of soap solution is 30x 10^-3 Nm^-1)

2.4 π mJ
4.8 π mJ
2.4 π J
4.8 π J

Boyle's law states that,

P x V = constant
\(\frac{P}{V}\) = constant
P X V² = constant
\(\frac{P}{V^{2}}\) = constant

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

A pure substance would freeze or solidity at its

boiling point
condensation point
melting point
sublimation point

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

Formula for specific latent heat of fusion is

L_f= m/l_f
L_f=l_f/m
\(l_{f}=L_{f} \times m\)
l_f=L_f/m

When state is being changed from gas to liquid through process of condensation, temperature will be,

increases
decreases
remains constant
may increase or decrease

The wettability of a surface by a liquid depends primarily on

viscosity
surface tension
density
angle of contact between the surface and the liquid

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

The viscous force the relative motion between the adjacent layers of a fluid in motion which one of the following is absolutely fit?

opposes
never affects
facilitates
may effect under certain conditions

Part - B

Generic 2 - Answer All Question

State the 2 factors on which modulus of elastic depends.

What is the effect of temperature on elasticity?

A wire of length 2 m with the area of crosssection 10^-6m² is used to suspend a load of 980 N. Calculate i) the stress developed in the wire ii) the strain and iii) the energy stored. Given: Y=12 × 10¹⁰N m⁻².
A wire elongates by 1 mm when a load w is hanged from it if the wire goes over a pulley and 2 weights w each are hung at the 2 ends, what will be the elongation of wire in mm?

State Bernoulli’s theorem.

Part - C

Generic 3 - Answer All Question

In a normal adult, the average speed of the blood through the aorta (radius r = 0.8 cm) is 0.33 ms^-1. From the aorta, the blood goes into major arteries, which are 30 in number, each of radius 0.4 cm. Calculate the speed of the blood through the arteries

A capillary tube is dipped first in cold water and then in hot water. Comment on the capillary rise in the second case.

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.

The upper end of a wire of radius 4mm & length 100cm is clamped and its other rend is twisted through an angle of 30° the angle of shear is.
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

Part - D

Generic 5 - Answer All Question

Write the Applications of elasticity.

Obtain an expression for the excess of pressure inside a i) liquid drop ii) liquid bubble iii) air bubble.

An deal gas is expanded such that ρT² =a constant find the coefficient of volume expansion of the gas.

State and prove Archimedes principle.
Two rods of equal length and diameter have thermal conductivities 3 & 4 units. If they joined in series. Find the thermal conductivity of the combination.

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

MABS Institution

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

Part - A

Multiple Choice Question - Answer All Question

The work done against surface tension in blowing a soap bubble from a radjus of 5 cm to 15 cm is (surface tension of soap solution is 30x 10-3 Nm-1)

Boyle's law states that,

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

A pure substance would freeze or solidity at its

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

Formula for specific latent heat of fusion is

When state is being changed from gas to liquid through process of condensation, temperature will be,

The wettability of a surface by a liquid depends primarily on

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)

The viscous force the relative motion between the adjacent layers of a fluid in motion which one of the following is absolutely fit?

Part - B

Generic 2 - Answer All Question

State the 2 factors on which modulus of elastic depends.

What is the effect of temperature on elasticity?

A wire of length 2 m with the area of crosssection 10-6m2 is used to suspend a load of 980 N. Calculate i) the stress developed in the wire ii) the strain and iii) the energy stored. Given: Y=12 × 1010N m−2.

A wire elongates by 1 mm when a load w is hanged from it if the wire goes over a pulley and 2 weights w each are hung at the 2 ends, what will be the elongation of wire in mm?

State Bernoulli’s theorem.

Part - C

Generic 3 - Answer All Question

In a normal adult, the average speed of the blood through the aorta (radius r = 0.8 cm) is 0.33 ms-1. From the aorta, the blood goes into major arteries, which are 30 in number, each of radius 0.4 cm. Calculate the speed of the blood through the arteries

A capillary tube is dipped first in cold water and then in hot water. Comment on the capillary rise in the second case.

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.

The upper end of a wire of radius 4mm & length 100cm is clamped and its other rend is twisted through an angle of 30° the angle of shear is.

Part - D

Generic 5 - Answer All Question

Write the Applications of elasticity.

Obtain an expression for the excess of pressure inside a i) liquid drop ii) liquid bubble iii) air bubble.

An deal gas is expanded such that ρT2 =a constant find the coefficient of volume expansion of the gas.

State and prove Archimedes principle.

Two rods of equal length and diameter have thermal conductivities 3 & 4 units. If they joined in series. Find the thermal conductivity of the combination.

Comment

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The work done against surface tension in blowing a soap bubble from a radjus of 5 cm to 15 cm is (surface tension of soap solution is 30x 10^-3 Nm^-1)

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

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)

A wire of length 2 m with the area of crosssection 10^-6m² is used to suspend a load of 980 N. Calculate i) the stress developed in the wire ii) the strain and iii) the energy stored. Given: Y=12 × 10¹⁰N m⁻².

In a normal adult, the average speed of the blood through the aorta (radius r = 0.8 cm) is 0.33 ms^-1. From the aorta, the blood goes into major arteries, which are 30 in number, each of radius 0.4 cm. Calculate the speed of the blood through the arteries

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.

An deal gas is expanded such that ρT² =a constant find the coefficient of volume expansion of the gas.