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Physics Chemistry Botany Zoology

Question bank:

Bernoulli's theorem is based on :

conservation of energy
conservation of mass
conservation of momentum
conservation of angular momentum

Two spherical soap bubbles of radii r₁ and r₂ in vaccum collapse under isothermal condition. The resulting bubble has radius equal to :

\frac{r_{1} + r_{2}}{2}

\frac{r_{1} r_{2}}{r_{1} - r_{2}}

\sqrt{r_{1} r_{1}}

\sqrt{r_{1}^{2} + r_{2}^{2}}

The energy needed in breaking of a drop of liquid of radius R into n drops of radius r is given by (T is surface tension and P is atmospheric pressure) :

(4 {πr}^{2} n - 4 {πR}^{2}) T

(4 / 3 {πr}^{2} n - 4 / 3 {πR}^{3}) T

(4 {πR}^{2} n - 4 {πr}^{2}) T

(8 {πr}^{2} n - 8 {πR}^{2}) T

A rectangular film of liquid is extended from (4 cm $\times 2 c m$ ) to $(5 c m \times 4 \times c m)$ . If the work done is $3 \times 10^{- 4}$ J,the value of the surface tension of the liquid is

0.250 N m^{- 1}

0.125 N m^{- 1}

0.2 N m^{- 1}

8.0 N m^{- 1}

Three liquids of densities $ρ_{1}, ρ_{2} a n d ρ_{3}$ (with $p_{1} > p_{2} > p_{3}$ ), having the same value of surface tension T, rise to the same height in three identical capillaries. The angles of contact $θ_{1}, θ_{2} a n d θ_{3}$ obey

\frac{π}{2} > θ_{1} > θ_{2} > θ_{3} \geq 0

0 \leq θ_{1} < θ_{2} < θ_{3} < \frac{π}{2}

\frac{π}{2} < θ_{1} < θ_{2} < θ_{3} < π

π > θ_{1} > θ_{2} > θ_{3} > \frac{π}{2}

Two non-mixing liquids of densities $ρ$ and n $ρ$ (n>1) are put in a container. The height of each liquid is h. A solid cylinder floats with its axis vertical and length pL $(p < 1)$ in the denser liquid. The density of the cylinder is d. The cylinder floats with its axis vertical and length pL (p<1) in the denser liquid. The density d is equal to

{2+(n+1)p}

ρ

{2+(n-1)p}

ρ

{1+(n-1)p}

ρ

{1+(n+1)p}

ρ

The approximate depth of an ocean is 2700 m. The compressibility of water is 45.4 x 10^-11 Pa^-1 and density of water is 10³kg/m³. What fractional compression of water will be obtained at the bottom of the ocean?

0.8x10^-2

1.0x10^-2

1.2x10^-2

1.4x10^-2

A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m². Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be (P_air=1.2kg/m³)

4.8x10⁵N,downwards

4.8x10⁵N,upwards

2.4x10⁵N,upwards

2/4x10⁵N,downwards

The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is v, the speed of the ejection of the liquid through the holes is

vR²/n²r²

vR²/nr²

vR²/n³r²

v²R/nr

The heart of a man pumps 5L of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be $13.6 x 10^{3}$ kg/m³ and g =10 m/s², then the power of heart in watt is

1.70

2.35

3.0

1.50

Water rises to a height h in capillary tube . If the length of capillary tube is above the surface of water is made less than h, then

water rises upto the tip of capillary tube and then starts overflowing like a fountain

water rises upto the top of capillary tube and stays there without overflowing

water rises upto a point a little below the top and stays there

water does not rise at all

A certain number of spherical drops of a liquid of radius r coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then

E n e r g y = 4 V T (\frac{1}{r} - \frac{1}{R}) i s r e l e a s e d

E n e r g y = 3 V T (\frac{1}{r} + \frac{1}{R}) i s r e l e a s e d

E n e r g y = 3 V T (\frac{1}{r} - \frac{1}{R}) i s r e l e a s e d

E n e r g y n e i t h e r r e l e a s e d n o r a b s o r b e d

The wettability of a surface by a liquid depends primarily on

viscosity
surface tension

density
angle of contact between the surface and the liquid

An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

\frac{1}{2} m v^{3}

m v^{3}

\frac{1}{2} m v^{2}

\frac{1}{2} m^{2} v^{2}

Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is 36 g and its density is 9 g / cm³. If the mass of the other is 48 g, its density in g / cm³ is

\frac{4}{3}

\frac{3}{2}

3
5

NEET Questions

Question bank:

Bernoulli's theorem is based on :

Two spherical soap bubbles of radii r1 and r2 in vaccum collapse under isothermal condition. The resulting bubble has radius equal to :

The energy needed in breaking of a drop of liquid of radius R into n drops of radius r is given by (T is surface tension and P is atmospheric pressure) :

A rectangular film of liquid is extended from (4 cm× 2 cm) to 5 cm×4×cm. If the work done is 3×10-4 J,the value of the surface tension of the liquid is

Three liquids of densities ρ1, ρ2 and ρ3 (with p1>p2>p3), having the same value of surface tension T, rise to the same height in three identical capillaries. The angles of contact θ1,θ2 and θ3 obey

The approximate depth of an ocean is 2700 m. The compressibility of water is 45.4 x 10-11 Pa-1 and density of water is 103kg/m3. What fractional compression of water will be obtained at the bottom of the ocean?

A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m2. Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be (Pair=1.2kg/m3)

The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is v, the speed of the ejection of the liquid through the holes is

The heart of a man pumps 5L of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be 13.6 x 103 kg/m3 and g =10 m/s2, then the power of heart in watt is

Water rises to a height h in capillary tube . If the length of capillary tube is above the surface of water is made less than h, then

A certain number of spherical drops of a liquid of radius r coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then

The wettability of a surface by a liquid depends primarily on

An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is 36 g and its density is 9 g / cm3. If the mass of the other is 48 g, its density in g / cm3 is

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