### ALL Questions

## What is Distillation method/technique to Refine Metal

What is Distillation method/technique to Refine Metal

## A particle is projected vertically upwards the surface of the earth (radius Re) with a speed equal to one fourth of escape velocity. What is the maximum height attained by it from the surface of the earth ?

A particle is projected vertically upwards the surface of the earth (radius Re) with a speed equal to one fourth of escape velocity. What is the maximum height attained by it from the surface of the earth ?

## At a site, low grade copper ores are available and zinc and iron scraps are also available. Which of the two scraps would be more suitable for reducing the leached copper ore and why?

At a site, low grade copper ores are available and zinc and iron scraps are also available. Which of the two scraps would be more suitable for reducing the leached copper ore and why?

## Why is the reduction of a metal oxide easier if the metal formed is in liquid state at the temperature of reduction?

Why is the reduction of a metal oxide easier if the metal formed is in liquid state at the temperature of reduction?

## Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why ?

Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why ?

## Suggest a condition under which magnesium could reduce alumina

Suggest a condition under which magnesium could reduce alumina

## what is Limitations of Ellingham Diagram

what is Limitations of Ellingham Diagram

## Explain Ellingham Diagram

Explain Ellingham Diagram

## EXPLAIN Froth Floatation Method FOR CONCENTRATION OF ORES .

EXPLAIN Froth Floatation Method FOR CONCENTRATION OF ORES .

## EXPLAIN Magnetic Separation PROCESS FOR CONCENTRATION OF ORES .

EXPLAIN Magnetic Separation PROCESS FOR CONCENTRATION OF ORES .

## Explain Hydraulic Washing process for Concentration of Ores .

Explain Hydraulic Washing process for Concentration of Ores .

## What is the Concentration of Ores of Ores

What is the Concentration of Ores of Ores

## Please let me know the Principal Ores of Some Important Metals

SOne please let me know the Principal Ores of Some Important Metals

## A solid sphere of mass M and radius R is surrounded by a spherical shell of same mass M and radius 2R as shown. A small particle of mass m is released from rest from a height h (<<R) above the shell. There is a hole in the shell.

A solid sphere of mass M and radius R is surrounded by a spherical shell of same mass M and radius 2R as shown. A small particle of mass m is released from rest from a height h (<<R) above the shell. There is a hole in the shell.

## If the law of gravitation be such that the force of attraction between two particles vary inversely as the 5/2th power of their separation, then the graph of orbital velocity v0 plotted against the distance r of a satellite from the earth's centre on a log-log scale is shown alongside. The slope of line will be

If the law of gravitation be such that the force of attraction between two particles vary inversely as the 5/2th power of their separation, then the graph of orbital velocity v0 plotted against the distance r of a satellite from the earth's centre on a log-log scale is shown alongside. The slope of line will be

## A body starts performing uniform circular motion with 100 rounds per min. After how much minimum time its average velocity will be zero?

## What is (P ∪ Q) × (P ∩ Q) If P = {x : x < 3, x ∈ N}, Q = {x : x ≤ 2, x ∈ W} and W is the set of whole numbers.

## What is the domain of f + g if f and g be two functions given by f = {(2, 4), (5, 6), (8, – 1), (10, – 3)} g = {(2, 5), (7, 1), (8, 4), (10, 13), (11, – 5)}?

## If A and B be any two sets such that n(B) = p, n(A) = q then what is the total number of functions f : A → B is equal to?

## How following relation is a function? (i) R1 = {(2, 3), ( 1/2 , 0), (2, 7), (– 4, 6)} and (ii) R2 = {(x, |x |) | x is a real number}

## What is the domain and range of the relation R.

## If A = {2, 4, 6, 9} and B = {4, 6, 18, 27, 54}, a ∈ A, b ∈ B, what is the set of ordered pairs such that 'a' is factor of 'b' and a < b.

## Let A = {1, 2, 3, 4} and B = {5, 7, 9}. What is the value of (i) A × B (ii) B × A (iii) Is A × B = B × A ? (iv) Is n (A × B) = n (B × A) ?

## An open glass tube is immersed in mercury in such a way that a length of 8 cm extends above the mercury level. The open end of the tube is then closed and sealed and the tube is raised vertically up by additional 46 cm. What will be length of the air column above mercury in the tube now?

An open glass tube is immersed in mercury in such a way that a length of 8 cm extends above the mercury level. The open end of the tube is then closed and sealed and the tube is raised vertically up by additional 46 cm. What will be length of the air column above mercury in the tube now?

## What are the four stages of binary fission in amoeba?

What are the four stages of binary fission in amoeba?

## Rita performs two set of experiments to study the length of the foam formed which are as follows: Set I: she takes 10 ml of distilled water in test tube “A” and adds 5-6 drops of liquid soap in it and shakes the test tube vigorously. Set II: she takes 10 ml of distilled water in a test tube “A” and adds 5-6 drops of liquid soap with half spoonful of CaSO 4 in it and shakes the test tube. Write your observation and reason

Rita performs two set of experiments to study the length of the foam formed which are as follows:

Set I: she takes 10 ml of distilled water in test tube “A” and adds 5-6 drops of liquid soap in it and shakes the test tube vigorously.

Set II: she takes 10 ml of distilled water in a test tube “A” and adds 5-6 drops of liquid soap with half spoonful of CaSO 4 in it and shakes the test tube. Write your observation and reason

## What do you observe when you drop a few drops of acetic acid to a test tube containing: (a) Phenolphthalein (b) Distilled water (c) Universal indicator (d) Sodium hydrogen carbonate

What do you observe when you drop a few drops of acetic acid to a test tube containing:

(a) Phenolphthalein

(b) Distilled water

(c) Universal indicator

(d) Sodium hydrogen carbonate

## Define phytohormones and Give two functions of each: (i) Auxin (ii) Gibberellins (iii) Abscissic acid (iv) Ethylene

Define phytohormones and Give two functions of each: (i) **Auxin** (ii) **Gibberellins** (iii) **Abscissic acid** (iv) **Ethylene**

## Why It is more difficult to walk on ice than on a concrete road ?

Why It is more difficult to walk on ice than on a concrete road ?

## Can some one please let me know in which galaxy the earth is located?

Can some one please let me know in which galaxy the earth is located?

## A box of mass m is initially at rest on a horizontal surface. A constant horizontal force of mg/2 is applied to the box directed to the right. The coefficient of friction of the surface changes with the distance pushed as µ = µ0x where x is the distance from the initial location. For what distance is the box pushed until it comes to rest again?

A box of mass m is initially at rest on a horizontal surface. A constant horizontal force of mg/2 is applied to the box directed to the right. The coefficient of friction of the surface changes with the distance pushed as µ = µ0x where x is the distance from the initial location. For what distance is the box pushed until it comes to rest again?

## A pendulum bob of mass m is suspended at rest. A cosntant horiozntal force F = mg/2 starts acting on it. The maximum angular deflection of the string is?

## The mean lives of a radioactive sample are 30 years and 60 years for alpha-emission and beta–emission respectively. If the sample decays both by alpha–emission and beta–emission simultaneously, the time after which, only one-fourth of the sample remain is

The mean lives of a radioactive sample are 30 years and 60 years for alpha-emission and beta–emission respectively. If the sample decays both by alpha–emission and beta–emission simultaneously, the time after which, only one-fourth of the sample remain is

## 400 ml of a gas at 227o C is to be reduced to a volume of 300 ml. By what degrees Celsius, must the temperature be altered keeping pressure constant.

## In how ways can 6 coins be chosen from 20 one rupees coins, 10 fifty paise coins, 7 twenty paise coins.

In how ways can 6 coins be chosen from 20 one rupees coins, 10 fifty paise coins, 7 twenty paise coins.

## A 200 mL of solution of I2 is divided into two unequal parts. I part reacts with hypo solution in acidic medium, 30 ml of 0.2 M hypo was consumed, II part was added with 50 mL of 0.6 M NaOH solution. What was the initial concentration of I2.

A 200 mL of solution of I2 is divided into two unequal parts. I part reacts with hypo solution in acidic medium, 30 ml of 0.2 M hypo was consumed, II part was added with 50 mL of 0.6 M NaOH solution. What was the initial concentration of I2.

## The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is?

The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is?

## A cubic unit cell has one atom on each corner and one atom on each body diagonal. The number of atoms in the unit cell is ?

A cubic unit cell has one atom on each corner and one atom on each body diagonal. The number of atoms in the unit cell is ?

## Crystal systems in which no two axial lengths are equal are?

Crystal systems in which no two axial lengths are equal are?

## Nitrogen exit as N2 but phosphorus exit as P4 why?

Nitrogen exit as but phosphorus exit as why?

## Name the crystal defect which lowers the density of an ionic crystal .

## Two particles A and B of equal mass M are moving with the same speed v as shown in the figure. They collide completely inelastically and move as a single particle C. The angle θ that the path of C makes with the X-axis is given by :

## The total number of neutrons present in 108 ml H2O(l)?

The total number of neutrons present in 108 ml H2O(l)?

## A card is lost from a pack of 52 playing cards. From the remainder of the pack, one card is drawn and is found to be spade. The probability that the missing card is a spade is?

A card is lost from a pack of 52 playing cards. From the remainder of the pack, one card is drawn and is found to be spade. The probability that the missing card is a spade is?

## A spherical conductor of radius 3 m is charged to a potential of 90 V. It is now placed inside another hollow spherical conductor of radius 6 m. Calculate the potential of bigger sphere if the smaller sphere is made to touch the bigger sphere?

A spherical conductor of radius 3 m is charged to a potential of 90 V. It is now placed inside another hollow spherical conductor of radius 6 m. Calculate the potential of bigger sphere if the smaller sphere is made to touch the bigger sphere?

## Write the set of all positive integers whose cube is odd.

Write the set of all positive integers whose cube is odd.

## A bag contains 50 tickets, numbered from 1 to 50. One ticket is drawn at random. What is the probability that (i) number on the ticket is a perfect square or divisible by 3 ? (ii) number on the ticket is prime number or greater than 40 ?

A bag contains 50 tickets, numbered from 1 to 50. One ticket is drawn at random. What is the probability that

(i) number on the ticket is a perfect square or divisible by 3 ?

(ii) number on the ticket is prime number or greater than 40 ?

## Xx+(since)inx

## A mass (M) is split into two parts (m) and (M–m). Which are then separated by a certain distance. What ratio m M will maximise the gravitational force between the parts ?A mass (M) is split into two parts (m) and (M–m). Which are then separated by a certain distance. What ratio m/ M will maximise the gravitational force between the parts ?

A mass (M) is split into two parts (m) and (M–m). Which are then separated by a certain distance. What ratio m M will maximise the gravitational force between the parts ?A mass (M) is split into two parts (m) and (M–m). Which are then separated by a certain distance. What ratio m/ M will maximise the gravitational force between the parts ?

## Two stationary particles of masses M1 and M2 are at a distance 'd' apart. A third particle lying on the line joining the particles, experiences no resultant gravitational forces. What is the distance of this particle from M1 ?

Two stationary particles of masses M1 and M2 are at a distance 'd' apart. A third particle lying on the line joining the particles, experiences no resultant gravitational forces. What is the distance of this particle from M1 ?