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Questions >> JEEMAIN and NEET >> Physics

Physics

What is the pressure inside the drop of mercury of radius 3mm at room temperature?S.T of mercury at that temperature $(20^{\large\circ}C)$ is $4.65\times 10^{-1}Nm^{-1}$ .The $P_{atm}=1.01\times 10^4pa$ .Also give excess pressure inside the drop

asked May 9, 2014 by sreemathi.v

1 answer

U-shaped wire is dipped in a soap solution,and removed.The thin film formed between the wire and the light slider,supports a weight of $1.5\times 10^{-2}N$ (which includes the small weight of the slider).The length of slider is 30cm.What is the surface tension of the film?

asked May 9, 2014 by sreemathi.v

1 answer

From the figure below,(A) & (B) refer to the study of flow of a (non-viscous) liquid.Which of the two figures is incorrect?( $P_1$ & $P_2$ represents pipe)

asked May 9, 2014 by sreemathi.v

1 answer

There is a small hole near the botttom of an open tank filled with a liquid.The speed of water ejected does not depend on

asked May 9, 2014 by sreemathi.v

1 answer

The three vessels shown in figure below have same base area.Equal volume of a liquid are passed in the three vessels.The force on the base will be

asked May 9, 2014 by sreemathi.v

1 answer

Equal mass of three liquids are kept in three identical cylindrical vessel A,B and C.The densities are $\rho_A,\rho_B,\rho_C$ with $f_A < f_B < f_C$ .The force on the base will be

asked May 9, 2014 by sreemathi.v

1 answer

A wooden object floats in $H_2O$ kept in beaker.The object is near a side of the beaker (given in diagram).Let $P_1,P_2,P_3$ be the pressures at the three points $A,B$ and $C$ of the bottom as shown in figure.

asked May 9, 2014 by sreemathi.v

1 answer

Water is flowing through a long horizontal tube.Let $P_A$ & $P_B$ be the pressures at two horizontal points A and B of the tube.

asked May 9, 2014 by sreemathi.v

1 answer

Bernoulli’s theorem is based on conservation of which of the following:

asked May 9, 2014 by sreemathi.v

1 answer

The only possible dimensionless group that combines velocity $V_1$ body size $L$ ,fluid density $\rho$ and surface tension coefficient $\sigma$ is

asked May 9, 2014 by sreemathi.v

1 answer

The absolute viscocity $\mu$ of a fluid is primarily a function of

asked May 9, 2014 by sreemathi.v

1 answer

A rod of mass M of radius r,length l made up of material of young modulus Y is rotating in horizontal plane with angular velocity $\omega$ .

asked May 9, 2014 by sreemathi.v

1 answer

A rod of radius 2mm,length 80cm density $5KKg/m^3$ and made up of material of $Y=1\times 10^{10}N/m^2$ .Find the elongation due to its own weight.

asked May 9, 2014 by sreemathi.v

1 answer

The length of a wire is 8cm when tension in it is 80N and is 15cm when tension in it 200N.The natural length of the wire is

asked May 9, 2014 by sreemathi.v

1 answer

Two wires of radii in the ratio 2 : 3,lengths in the ratio 3 : 5.Forces applied in the ratio 5 : 7 with young modulii in the ratio 3 : 4.The change in length is in the ratio

asked May 8, 2014 by sreemathi.v

1 answer

A wire can sustain the weight of 5kg.If we cut the wire in 3 parts then together 3 parts can sustain the weight

asked May 8, 2014 by sreemathi.v

1 answer

The ratio of maximum tension in two string of same material having radii in the ratio 3 : 5

asked May 8, 2014 by sreemathi.v

1 answer

When the load is hang from a string then the ratio of work done by gravity to the work done spring force is

asked May 8, 2014 by sreemathi.v

1 answer

The potential energy U between two molecules as a function of distance r between them has been shown.The two molecules are

asked May 8, 2014 by sreemathi.v

1 answer

The rods A and B are heated.If $\alpha_1 : \alpha_2=5 : 7$ ,the thermal stresses develpoed on the two rods are equal if $Y_1 : Y_2$ is

asked May 8, 2014 by sreemathi.v

1 answer

A golden ring of radius 0.5cm and cross section area $2mm^2$ is shifted to a wooden of disk of radius 8cm.If young modulus is $3\times 10^{10}N/m^2$ ,what is force along its length?

asked May 8, 2014 by sreemathi.v

1 answer

Two wires A and B of same material have radii in the ratio 4 : 1 and length on the ratio 2 : 1.The forces required to produce same change in length are in the ratio

asked May 8, 2014 by sreemathi.v

1 answer

A long spring is stretched by 3cm and its potential energy is U.If spring is stretched by 12cm,its potential energy will be

asked May 8, 2014 by sreemathi.v

1 answer

2 wires of equal length are suspended. $Y_1=2\times 10^{11}N/m^2$ and $Y_2=3\times 10^{11}N/m^2$ .Find equivalent young's modulus of combination, $Y$

asked May 8, 2014 by sreemathi.v

1 answer

A steel wire 5mm in diameter is fixed between 2 clamps at $30^{\large\circ}C$ .The temperature is increased to $30^{\large\circ}C$ .Find the tension at $50^{\large\circ}C$ if linear expansion of steel is $11\times 10^{-6}/^{\large\circ}C$ and $Y_{steel}=2.1\times 10^{11}N/m^2$

asked May 8, 2014 by sreemathi.v

1 answer

A rubber catapult has a cross sectional area $2mm^2$ and total unstretched length 15cm.It is stretched to 18cm and then released to project a missile of 3g.Taking young modulus $8\times 10^8N/m^2$ find velocity of projection?

asked May 8, 2014 by sreemathi.v

1 answer

A lift is tied with four iron wires and its mass is 1500Kg.If maximum acceleration of lift is $2m/s^2$ and maximum safe stress is $2\times 10^8N/m^2$ find the minimum diameter of the wire $g=10m/s^2$

asked May 8, 2014 by sreemathi.v

1 answer

Find the density of material under a pressure $3\times 10^8N/m^2$ .Given the density of material $800Kg/m^3$ .Bulk modulus of material $9\times 10^9N/m^2$ .

asked May 8, 2014 by sreemathi.v

1 answer

A solid sphere of radius 2cm of bulk modulus $2\times 10^6N/m^2$ is surrounded by a liquid in cylindrical container.A massless piston of area $100cm^2$ floats on the surface of the liquid.When a mass 30Kg is placed on piston to compress the liquid what is fractional change in the radius of sphere

asked May 8, 2014 by sreemathi.v

1 answer

When the weight on a string is changed from 4Kg to 10Kg,the elongation changes from 0.3mm to 0.7mm,how much work done during this extension of the string?( $g=10m/s^2$ )

asked May 8, 2014 by sreemathi.v

1 answer

What is tension in the wire of radius r and length 2l in the given situation if young's modulus is $Y$ .

asked May 8, 2014 by sreemathi.v

1 answer

A wire of 4m in length suspended vertically stretches by 1mm when mass of 25Kg is attached to the lower end.What is the elastic potential energy gained by the wire? $g=10m/s^2$

asked May 8, 2014 by sreemathi.v

1 answer

How much energy stored will increase in a steel wire of 5m and $2mm^2$ cross sectional area when force on it increases to 300N from 50N?( $Y_{Steel}=2\times 10^{11}N/m^2$ )

asked May 8, 2014 by sreemathi.v

1 answer

A brass rod of 2m is stretched by 1cm have crosssectional area $2cm^2$ .If a force of $10^5$ N is applied on it.What is elastic potential energy density?

asked May 8, 2014 by sreemathi.v

1 answer

2 wires of radius in ratio 1 : 2 have young modulus in ratio 2 : 3.Equal force is applied on them ,what is the ratio of elastic potential energy

asked May 8, 2014 by sreemathi.v

1 answer

Calculate the increase in energy of steel rod of 2m and crosssectional area $4cm^2$ ,when a 500N force is applied on it. $Y_{steel}=2\times 10^{11}N/m^2$

asked May 8, 2014 by sreemathi.v

1 answer

If a force F displace 0.25cm with respect to bottom.What is F if modulus of rigidity is $5\times 10^5$ .

asked May 8, 2014 by sreemathi.v

1 answer

Calculate the % change on volume is bulk modulus of water is $2\times 10^9N/m^2$ and average depth of sea is 4000m,take $g=10m/s^2$ .

asked May 8, 2014 by sreemathi.v

1 answer

What is change in volume in cc of 5cc of water at surface taken to the bottom of the lake 50m deep,given volume elasticity is $20\times 10^3$ atm

asked May 8, 2014 by sreemathi.v

1 answer

A sphere contracts in volume by 0.05% which taken to the bottom of sea 500m deep.Find bulk modulus of sphere.

asked May 8, 2014 by sreemathi.v

1 answer

Elastic and plastic regions are respectively

asked May 8, 2014 by sreemathi.v

1 answer

Two rods of equal length are in parallel with area in the ratio 3 : 4 and young modulus in the ratio 5 : 3.The ratio of force on the rods is

asked May 8, 2014 by sreemathi.v

1 answer

Two wires A and B of equal cross sectional area are in series,stretches equally is $Y_A=3\times 10^{11}$ and $Y_B=1.8\times 10^{11}$ .What is ratio of their length?

asked May 7, 2014 by sreemathi.v

1 answer

Calculate elongation if $l_{steel}=2m$ and $l_{brass}=1.5m$ , $a_{steel}=2mm^2$ and $a_{brass}=5mm^2$ , $Y_{steel}=2\times 10^{11}N/m^2$ and $Y_{brass}=1\times 10^{11}N/m^2$ .

asked May 7, 2014 by sreemathi.v

1 answer

Two steel wire are hang from roof.Their length and radius are in the ratio 3 : 5 and 1 : 2 respectively.If the extension in first wire is 2mm,what is extension in other if force applied is in the ratio 2 : 3?

asked May 7, 2014 by sreemathi.v

1 answer

A mass of 1kg is attached to the end of a rubber string 25cm long having radius 2mm,which is rotating in horizontal plane in a radius of 28cm with 50rpm.What is young modulus of string in $N/m^2$

asked May 7, 2014 by sreemathi.v

1 answer

A wire of r=1cm consist of 1m steel and 2m copper respectively.Total extension when a force applied is 1mm.Find the force is $Y_{cu}=1.1\times 10^{11}N/m^2,Y_{steel}=2\times 10^{11}N/m^2$ .

asked May 7, 2014 by sreemathi.v

1 answer

2 wire of length 1 : 2 and area in the ratio 2 : 1 is applied with equal force stretch equally .Find the ratio of modulus of rigidity

asked May 7, 2014 by sreemathi.v

1 answer

The breaking stress of aluminium is $7\times 10^7N/m^2$ .Find the maximum length of wire that can be hang with out breaking if density of aluminium is $3\times 10^3Kgm^{-3}$

asked May 7, 2014 by sreemathi.v

1 answer

Calculate change in volume percentage if we apply a pressure of 50atm on a material of Bulk modulus $2\times 10^{11}N/m^2$ .

asked May 7, 2014 by sreemathi.v

1 answer

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