## In a group of 1000 people, there are 750 who can speak Hindi and 400 who can speak English. How many can speak Hindi only ?How many can speak English ? How many can speak both Hindi and English? In a group of 1000 people, there are 750 who can speak Hindi and 400 who can speak English. How many can speak Hindi only ?How many can speak English ? How many can speak both Hindi and English?

Anonymous User tag : Maths 22 Apr, 2019 73 views

## A billiard ball is hit by a cue at a point distance h above the centre. It acquires a linear velocity v0. Let m be the mass and r be the radius of the ball. The angular velocity acquired by the ball is? A billiard ball is hit by a cue at a point distance h above the centre. It acquires a linear velocity v0. Let m be the mass and r be the radius of the ball. The angular velocity acquired by the ball is?

Anonymous User tag : Physics 20 Apr, 2019 97 views

## A simple pendulum is suspended in a lift which 5. is going up with an acceleration 5 m/s2. An electric field of magnitude 5 N/C and directed vertically upward is also present in the lift. The charge of the bob is 1 mC and mass is 1 mg. Taking g = p2 and length of the simple pendulum 1m, the time period of the simple pendulum is A simple pendulum is suspended in a lift which 5. is going up with an acceleration 5 m/s^2. An electric field of magnitude 5 N/C and directed vertically upward is also present in the lift. The charge of the bob is 1 mC and mass is 1 mg. Taking g = and length of the simple pendulum 1m, the time period of the simple pendulum is

Anonymous User tag : Physics 20 Apr, 2019 122 views

## Calculate the ratio of the speed of sound in neon to that in water vapour at any temperature. [Molecular weight of neon = 2.02 * 10–2 kg/mol and for water vapours = 1.8 * 10–2 kg/mol] Calculate the ratio of the speed of sound in neon to that in water vapour at any temperature. [Molecular weight of neon = 2.02 * 10–2 kg/mol and for water vapours = 1.8 * 10–2 kg/mol]

Anonymous User tag : Physics 19 Apr, 2019 223 views

## Speed of sound in air is 332 m/s at NTP. What will the speed of sound in hydrogen at NTP if the density of hydrogen at NTP is (1/16) that of air? Speed of sound in air is 332 m/s at NTP. What will the speed of sound in hydrogen at NTP if the density of hydrogen at NTP is (1/16) that of air?

Anonymous User tag : Physics 19 Apr, 2019 293 views

## Silver forms ccp lattice and X-ray studies of its crystals show that the edge length of its unit cell is 408.6 pm. Calculate the density of silver (Atomic mass = 107.9 u).

Silver forms ccp lattice and X-ray studies of its crystals show that theedge length of its unit cell is 408.6 pm. Calculate the density of silver (Atomic mass = 107.9 u).

Rajkumar Yadav tag : Chemistry 19 Apr, 2019 119 views

## X-ray diffraction studies show that copper crystallises in an fcc unit cell with cell edge of 3.608×10-8 cm. In a separate experiment, copper is determined to have a density of 8.92 g/cm3, calculate the atomic mass of copper

X-ray diffraction studies show that copper crystallises in an fcc unit cell with cell edge of 3.608×10-8 cm. In a separate experiment, copper is determined to have a density of 8.92 g/cm3, calculate the atomic mass of copper

Rajkumar Yadav tag : Chemistry 19 Apr, 2019 60 views

## An element has a body-centred cubic (bcc) structure with a cell edge of 288 pm. The density of the element is 7.2 g/cm3. How many atoms are present in 208 g of the element?

An element has a body-centred cubic (bcc) structure with a cell edge of 288 pm. The density of the element is 7.2 g/cm3. How many atoms are present in 208 g of the element?

Rajkumar Yadav tag : Chemistry 19 Apr, 2019 101 views

## What is Packing Efficiency?

What is Packing Efficiency?Explian

Rajkumar Yadav tag : Chemistry 19 Apr, 2019 50 views

## Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

Rajkumar Yadav tag : Chemistry 19 Apr, 2019 158 views

## A compound is formed by two elements X and Y. Atoms of the element Y (as anions) make ccp and those of the element X (as cations) occupy all the octahedral voids. What is the formula of the compound?

A compound is formed by two elements X and Y. Atoms of the elementY (as anions) make ccp and those of the element X (as cations) occupy all the octahedral voids. What is the formula of the compound?

Rajkumar Yadav tag : Chemistry 19 Apr, 2019 60 views

## What is Close Packed Structures please explain ?

What is Close Packed Structures please explain ?

Rajkumar Yadav tag : Chemistry 19 Apr, 2019 52 views

## A number consists of three digits which are in G.P. the sum of the right hand and left hand digits exceeds twice the middle digit by 1 and the sum of the left hand and middle digits is two third of the sum of the middle and right hand digits. Find the numbers? A number consists of three digits which are in G.P. the sum of the right hand and left hand digits exceeds twice the middle digit by 1 and the sum of the left hand and middle digits is two third of the sum of the middle and right hand digits. Find the numbers?

Anonymous User tag : Maths 18 Apr, 2019 362 views

## Four numbers are in A.P. If their sum is 20 and the sum of their squares is 120, then the middle terms are ? Four numbers are in A.P. If their sum is 20 and the sum of their squares is 120, then the middle terms are ?

Anonymous User tag : Maths 18 Apr, 2019 67 views

## Four different integers form an increasing A.P. One of these numbers is equal to the sum of the squares of the other three numbers. Find the numbers? Four different integers form an increasing A.P. One of these numbers is equal to the sum of the squares of the other three numbers. Find the numbers?

Anonymous User tag : Maths 18 Apr, 2019 195 views

## A particle is projected with a velocity of 30 m/s at an angle 60 above the horizontal on a slope of inclination 30 . Find its range, time of flight and angle of hit. A particle is projected with a velocity of 30 m/s at an angle 60 above the horizontal on a slope of inclination 30 . Find its range, time of flight and angle of hit.

Anonymous User tag : Physics 17 Apr, 2019 66 views

## What is FaceCentred Cubic Unit Cell

What is FaceCentred Cubic Unit Cell

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 52 views

## What is BodyCentred Cubic Unit Cell

What is BodyCentred Cubic Unit Cell

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 55 views

## What is Primitive Cubic Unit Cell ?

What is Primitive Cubic Unit Cell ?

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 55 views

## Explain different properties of Metallic Solids,Molecular solids, Ionic solids and Covalent

Explain different properties of Metallic Solids,Molecular solids, Ionic solids and Covalent

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 50 views

## Explain Covalent or Network Solids

Explain Covalent or Network Solids

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 51 views

## Explain Metallic Solids

Explain Metallic Solids

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 55 views

## Explain Ionic Solids

Explain Ionic Solids

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 55 views

## Explain Molecular Solids

Explain Molecular Solids

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 56 views

## Classification of Crystalline Solids

Classification of Crystalline Solids

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 51 views

## What is Difference Between Amorphous and Crystalline Solids ?

What is the Difference Between Amorphous and Crystalline Solids?

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 55 views

## What is Amorphous and Crystalline Solids

What is Amorphous and Crystalline Solids

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 51 views

## A sounding body emitting a frequency of 150 Hz is dropped from a height. During its fall under gravity it crosses a balloon moving upwards with a constant velocity of 2m/s one second after it started to fall. The difference in the frequency observed by the man in balloon just before and just after crossing the body will be: (given that -velocity of sound = 300m/s; g = 10m/s2 )

A sounding body emitting a frequency of 150 Hz is dropped from a height. During its fall under gravity it crosses a balloon moving upwards with a constant velocity of 2m/s one second after it started to fall. The difference in the frequency observed by the man in balloon just before and just after crossing the body will be:

Given that -velocity of sound = 300m/s; g = 10m/s2.

(A) 4

(B) 6

(C) 8

(D) 12

Kirti Gulati tag : Physics 16 Apr, 2019 53 views

## Describe the General Characteristics of Solid State

Describe the General Characteristics of Solid State

Rajkumar Yadav tag : Chemistry 16 Apr, 2019 54 views

## One mole of an ideal gas at a temperature T1 expands slowly according to the law V p = constant. Its final temperature is T2 . What will be the work done by gas?

One mole of an ideal gas at a temperature T1 expands slowly according to the law p/V = constant. Its final temperature is T2. The work done by the gas is : Kirti Gulati tag : Physics 16 Apr, 2019 67 views

## What is Projectile Motion ? Please explain with example? What is Projectile Motion ? Please explain with example?

Anonymous User tag : Physics 15 Apr, 2019 56 views

## A passenger is standing d distance away from a bus. The bus begins to move with constant acceleration a. To catch the bus, the passenger runs at a constant speed u towards the bus. What must be the minimum speed of the passenger so that he may catch the bus? A passenger is standing d distance away from a bus. The bus begins to move with constant acceleration a. To catch the bus, the passenger runs at a constant speed u towards the bus. What must be the minimum speed of the passenger so that he may catch the bus?

Anonymous User tag : Physics 15 Apr, 2019 82 views

## A driver takes 0.30 s to apply the brakes after he sees a need for it. This is called the reaction time of the driver. If he is driving a car at a speed of 54 km/h and the brakes cause a deceleration of 5.0m/s2, find the distance travelled by the car after he sees the need to put the brakes on ? A driver takes 0.30 s to apply the brakes after he sees a need for it. This is called the reaction time of the driver. If he is driving a car at a speed of 54 km/h and the brakes cause a deceleration of 5.0m/s2, find the distance travelled by the car after he sees the need to put the brakes on ?

Anonymous User tag : Physics 15 Apr, 2019 61 views

## Two moving particles P and Q are 10 m apart at any instant. Velocity of P is 8 m/s at 30 degree, from line joining the P and Q and velocity of Q is 6m/s at 30 degree.Calculate the angular velocity of P w.r.t. Q Two moving particles P and Q are 10 m apart at any instant. Velocity of P is 8 m/s at 30degree, from line joining the P and Q and velocity of Q is 6m/s at 30 degree.Calculate the angular velocity of P w.r.t. Q

Anonymous User tag : Physics 15 Apr, 2019 907 views

## What is the value of sec2(tan−1(2))+cosec2(cot−1(3))? Mitali Rajpoot tag : Maths 13 Apr, 2019 70 views

## The force of repulsion between two point charges is F, when these are at a distance of 1 m. Now the point charges are replaced by spheres of radii 25 cm having the charge same as that of point charges. The distance between their centres is 1 m, then compare the force of repulsion in two cases. The force of repulsion between two point charges is F, when these are at a distance of 1 m. Now the point charges are replaced by spheres of radii 25 cm having the charge same as that of point charges. The distance between their centres is 1 m, then compare the force of repulsion in two cases.

Anonymous User tag : Physics 13 Apr, 2019 680 views

## A particle of mass m carrying charge '+q1' is revolving around a fixed charge '–q2' in a circular path of radius r. Calculate the period of revolution. A particle of mass m carrying charge '+q1' is revolving around a fixed charge '–q2' in a circular path of radius r. Calculate the period of revolution.

Anonymous User tag : Physics 13 Apr, 2019 188 views

## If the distance between two equal point charges is doubled and their individual charges are also doubled, what would happen to the force between them? If the distance between two equal point charges is doubled and their individual charges are also doubled, what would happen to the force between them?

Anonymous User tag : Physics 13 Apr, 2019 60 views

## What is the role of depressant in froth floatation process? What is the role of depressant in froth floatation process?

Anonymous User tag : Chemistry 13 Apr, 2019 55 views

## Copper can be extracted by hydrometallurgy but not zinc. Explain. Copper can be extracted by hydrometallurgy but not zinc. Explain.

Anonymous User tag : Chemistry 13 Apr, 2019 60 views

## When a piece of polythene is rubbed with wool, a charge of – 2*10–7 C is developed on polythene. What is the amount of mass, which is transferred to polythene. When a piece of polythene is rubbed with wool, a charge of – 2*10–7 C is developed on polythene. What is the amount of mass, which is transferred to polythene.

Anonymous User tag : Physics 12 Apr, 2019 63 views

## If A and B are two sets containing 3 and 2 elements respectively. What would be then the no of subsets of AxB? Niti Gupta tag : Maths 12 Apr, 2019 51 views

## What is the value of F′(x)? Can anybody help me here. Thanks!!

Niti Gupta tag : Maths 12 Apr, 2019 53 views

## A large number of particles are moving each with speed v having directions of motion randomly distributed. What is the average relative velocity between any two particles averaged over all the pairs?

A large number of particles are moving each with speed v having directions of motion randomly distributed. What is the average relative velocity between any two particles averaged over all the pairs?

Rahul Kumar tag : Physics 12 Apr, 2019 235 views

## A particle is moving along a straight line along x-axis with an initial velocity of 2 m/s towards positive x-axis. A constant acceleration of 0.5 m/s2 towards negative x-axis starts acting on particle at t=0. Find velocity (in m/s) of particle at t = 2s.

A particle is moving along a straight line along x-axis with an initial velocity of 2 m/s towards positive x-axis. A constant acceleration of 0.5 m/s2 towards negative x-axis starts acting on particle at t=0. Find velocity (in m/s) of particle at t = 2s.

Rahul Kumar tag : Physics 12 Apr, 2019 61 views

## A body is thrown up with a speed 49 m/s. It travels 5 m in the last second of its upward journey. If the same body is thrown up with a velocity 98 m/s, how much distance (in m) will it travel in the last second. (g = 10 m/s2)?

A body is thrown up with a speed 49 m/s. It travels 5 m in the last second of its upward journey. If the same body is thrown up with a velocity 98 m/s, how much distance (in m) will it travel in the last second. (g = 10 m/s2)?

Rahul Kumar tag : Physics 12 Apr, 2019 80 views

## What is the interval of increase and decrease of funcunction?

Given f(x) = e (x 2 - x), find
a) the interval(s) of increase and decrease of f,
b) value(s) of x for which f has a local extremum,
c) the interval(s) of concavity and any inflection point(s).

Niti Gupta tag : Maths 12 Apr, 2019 55 views

## WHAT IS Zone refining METHOD/TECHNIQUE TO REFINE METAL WHAT IS Zone refining METHOD/TECHNIQUE TO REFINE METAL

Anonymous User tag : Chemistry 12 Apr, 2019 60 views

## WHAT IS Electrolytic refining METHOD/TECHNIQUE TO REFINE METAL WHAT IS Electrolytic refining METHOD/TECHNIQUE TO REFINE METAL

Anonymous User tag : Chemistry 12 Apr, 2019 56 views

## WHAT IS Liquation METHOD/TECHNIQUE TO REFINE METAL ## WHAT IS Liquation METHOD/TECHNIQUE TO REFINE METAL

Anonymous User tag : Chemistry 12 Apr, 2019 53 views