Recent questions tagged jeemain

In Ramsden eyepiece , the planoconvex lenses each of focal length f are separated by a distance 12 cm. the equivalent focal length (in cm) of the eyepiece is

asked Oct 22, 2013 by meena.p

1 answer

The refractive index of the material of a double convex lens is 1.5 and its focal length is $5\;cm$. If the ratii of curvature are equal , the value of the radius of curvature (in cm) is

asked Oct 22, 2013 by meena.p

1 answer

The sum of the coefficients of integral powers of $x$ in the expansion of $(1+\sqrt x)^{40}$ is

asked Oct 22, 2013 by rvidyagovindarajan_1

1 answer

Match the following

asked Oct 22, 2013 by meena.p

1 answer

A segment of wire vibrates with a fundamental frequency of $450\;Hz$ under a tension of 9 Kg wt. Then tension at which the fundamental frequency of the same wire becomes 900 Hz is

asked Oct 22, 2013 by meena.p

1 answer

A whistle of frequency 540 Hz rotates in a horizontal circle of radius 2 m at an angular speed of 15 rad/s. The highest frequency heard by a listener at rest with respect to the center of circle (velocity of sound in air = $330 ms^{-1}$)

asked Oct 22, 2013 by meena.p

1 answer

A black body radiates energy at the rate of $E watt/m^2$ at a high temperature T K. When the temperature is reduced to $\bigg(\large\frac{T}{2}\bigg)$K, the radiant energy is

asked Oct 22, 2013 by meena.p

1 answer

Two cylinders A and B fitted with pistons, contain equal number of moles of an ideal monoatomic gas at 400 K. The piston of a is free move while that of B is held fixed. Same amount of heat energy is given to the gas in each cylinder. If the rise in temperature of the gas in A is 42 K. the rise in temperature of the gas in B is $(\gamma=5/3)$

asked Oct 22, 2013 by meena.p

1 answer

The temperature of the system decreases in the process of

asked Oct 22, 2013 by meena.p

1 answer

From 200mg of $CO_2,10^{21}$ molecules are removed.How many moles of $CO_2$ are left?

asked Oct 22, 2013 by sreemathi.v

1 answer

The coefficient of the term independent of $x$ in the expansion of $\bigg[\large\frac{x+1}{x^{2/3}-x^{1/3}+1}-\frac{x-1}{x-\sqrt x}\bigg]^{\normalsize 10}$ is ?

asked Oct 22, 2013 by rvidyagovindarajan_1

1 answer

Two gases A and B having same pressure P, volume V and absolute temperature T are mixed. If the mixture has the volume and temperature as V and T respectively , then the pressure of the mixture is

asked Oct 22, 2013 by meena.p

1 answer

A clock which keeps correct times at $20^{\circ}C$, is subjected to $40^{\circ}$. If coefficient of linear expansion of the pendulum is $12 \times 10^{-6}/^{\circ}$ C. How much will it gain or lose time ?

asked Oct 22, 2013 by meena.p

0 answers

What is the mass of $3.01\times 10^{22}$ molecules of ammonia?

asked Oct 22, 2013 by sreemathi.v

1 answer

A horizontal pipe of non-uniform cross- section allows water to flow through it with a velocity $1\; ms^{-1}$ when pressure is $50\;kPa$ at a point. If the velocity of flow has to be $2 ms^{-1}$ at some other point the pressure at that point should be

asked Oct 22, 2013 by meena.p

1 answer

The liquid does not wet the solid surface if the angle of contact is

asked Oct 22, 2013 by meena.p

1 answer

How many molecules of water and oxygen atoms are present in 0.9g of water?

asked Oct 22, 2013 by sreemathi.v

1 answer

When a wire of length 10 m is subjected to a force of 100 N along its length, the lateral strain produced is $0.01 \times 10^{-3}\;m$. The Poisson's ratio was found to be 0.4. If the area of cross- section of wire is $0.025\;m^2$, its young's modulus is

asked Oct 22, 2013 by meena.p

1 answer

The magnitude of maximum acceleration is $\pi$ times that of maximum velocity of a simple harmonic oscillator. The time period of the oscillator in seconds is

asked Oct 22, 2013 by meena.p

1 answer

Insulin contains 3.4% sulphur.Then the minimum molecular mass of the insulin is about

asked Oct 22, 2013 by sreemathi.v

2 answers

The mass of a planet is half that of the earth and the radius of the planet is one- fourth that of earth. If we plan to send an artificial satellite from the planet, the escape velocity will be , (escape velocity on earth $v_e=11\;km- s^{-1}$)

asked Oct 22, 2013 by meena.p

1 answer

Two solid spheres (A and B) are made of metals of different densities $p_A$ and $p_B$ respectively. If their masses are equal, the ratio of their moments of inertia $(I_B / I_A)$ about their respective diameter is

asked Oct 22, 2013 by meena.p

1 answer

A gas has a vapour density 11.2. The volume occupied by 1g of the gas at NTP is

asked Oct 22, 2013 by sreemathi.v

1 answer

A bucket filled with water is tied to a rope of length 0.5 m and is rotated in a circular path in vertical plane. The least velocity it should have at the lowest point of circle so that water does not spill is. $(g=10ms^{-2})$

asked Oct 22, 2013 by meena.p

1 answer

A man slides down on a telegraphic pole with an acceleration equal to one-fourth of acceleration due to gravity. The frictional force between man and pole is equal to in terms of man's weight w

asked Oct 22, 2013 by meena.p

1 answer

116 mg of a compound on vaporization in Victor mayer's apparatus displaces 44.8 ml of air measured at STP.The molecular mass of the compound is

asked Oct 22, 2013 by sreemathi.v

1 answer

In two separate collisions, the coefficient of restitutions $e_1$ and $e_2$ are in the ratio $3:1$ . In the first collision the relative velocity of approach is twice the relative velocity of separation, then the ratio between relative velocity of approach and the relative velocity of separation in the second collision is

asked Oct 22, 2013 by meena.p

1 answer

Which has the maximum number of atom

asked Oct 22, 2013 by sreemathi.v

1 answer

$\sum ^{n}_{r=0} r^2.\:^nC_r$ = ?

asked Oct 22, 2013 by rvidyagovindarajan_1

1 answer

Two bodies of 6 kg and 4 kg masses have their velocity $5 \hat i+ 2 \hat j +10 \hat k$ and $10 \hat i - 2 \hat j -8 \hat k$ respectively. Then the velocity of their center of mass is

asked Oct 22, 2013 by meena.p

1 answer

An object of mass 2m is projected with a speed of $100\;ms^{1}$ at an angle $\theta=\sin ^{-1} \bigg(\large\frac{3}{5}\bigg)$ to the horizontal. At the highest point, the object breaks into two pieces of same mass m and the first one comes to rest. The distance between the point of projection and the point of landing of the bigger piece (in meter) is (Given , $g= 10 m/s^2$)

asked Oct 22, 2013 by meena.p

1 answer

Which of the following two oxide of nitrogen have 30.5% nitrogen

asked Oct 22, 2013 by sreemathi.v

1 answer

A rifle of 20 kg mass can fire 4 bullets per second. The mass of each bullets per second. The mass of each bullet is $35 \times 10^{-3}\;kg$ and its final velocity is $400\;ms^{-1}.$ Then what force must be applied on the rifle so that it does not move backwards while firing the bullets?

asked Oct 22, 2013 by meena.p

1 answer

Which of the following alkanes has 75% of carbon?

asked Oct 22, 2013 by sreemathi.v

1 answer

A block of mass $m=25\;kg$ sliding on a smooth horizontal surface with a velocity $v=3\;ms^{-1}$ meets the spring of spring constant $k=100\;n/m$ fixed at one end as shown in figure. Th maximum compression of the spring and velocity of block as it returns to the original position respectively are

asked Oct 22, 2013 by meena.p

1 answer

$\sum^{n} _ {r=0} r. \: ^nCr$ = ?

asked Oct 22, 2013 by rvidyagovindarajan_1

1 answer

$\sum^{n} _ {r=0} r. ^nCr$=?

asked Oct 22, 2013 by rvidyagovindarajan_1

0 answers

Which pair of species has same percentage of carbon?

asked Oct 22, 2013 by sreemathi.v

1 answer

It is found that 16.5g of metal combine with oxygen to form 35.6g of metal oxide.Calculate the percentage of metal and oxygen in the compound.

asked Oct 22, 2013 by sreemathi.v

1 answer

An unknown element forms an oxide.What will be the equivalent mass of the element if the oxygen content is 20% by mass ?

asked Oct 22, 2013 by sreemathi.v

1 answer

A piece of copper weighs $0.635g.$How many atoms of copper does it contain?

asked Oct 22, 2013 by sreemathi.v

1 answer

Velocity and acceleration vectors of charged particle moving perpendicular to the direction of a magnetic field at a given instant of time are $\overrightarrow v=2 \hat i+c \hat j$ and $\overrightarrow a=3 \hat i+4 \hat j$ respectively. Then the value of c is

asked Oct 22, 2013 by meena.p

1 answer

Some physical constants are given in List-I and their dimensional formulae are given in List- II. Match the following

asked Oct 22, 2013 by meena.p

1 answer

$25g$ of $MCl_4$ contains $0.5\;mol$ chlorine then its molecular mass is

asked Oct 22, 2013 by sreemathi.v

1 answer

Hydrolysis of sucrose with dilute aqueous sulfuric acid yields

asked Oct 22, 2013 by meena.p

1 answer

The number of dissimilar terms in the expansion of $(x_1+x_2+.....x_n)^3$ is ?

asked Oct 22, 2013 by rvidyagovindarajan_1

1 answer

The maximum number of molecules present in :

asked Oct 22, 2013 by sreemathi.v

1 answer

If $\bar {M}_w$ is the weight - average molecular weight and $M_n$ is the number -average molecular weight of a polymer, the poly dispersity index (PDI) of the polymer is given by

asked Oct 22, 2013 by meena.p

1 answer

The structure of the compound formed, when nitrobenzene is reduced by lithium aluminium hydride $(LiA / H_4)$ is

asked Oct 22, 2013 by meena.p

1 answer

3g of hydrocarbon on combustion with 11.2g of oxygen produce 8.8g of $CO_2$ and 5.4g of $H_2O$.The data illustrates the law of

asked Oct 22, 2013 by sreemathi.v

1 answer

Ask Questions, Get Answers