### ALL Questions

## Three particles, each of mass 10^-2 kg are brought from infinity to the vertices of an equilateral triangle of side 0.1 m, the work done is :

Three particles, each of mass 10^-2 kg are brought from infinity to the vertices of an equilateral triangle of side 0.1 m, the work done is :

## Masses of three wires are in the ratio 1 : 3 : 5 and their lengths are in the ratio 5 : 3 : 1. The ratio of their electrical resistance is?

Masses of three wires are in the ratio 1 : 3 : 5 and their lengths are in the ratio 5 : 3 : 1. The ratio of their electrical resistance is?

## A potential difference of V is applied at the ends of a copper wire of length l and diameter d. On doubling only d, drift velocity

A potential difference of V is applied at the ends of a copper wire of length l and diameter d. On doubling only d, drift velocity

## The resistance of a wire at 20 C is 20 W and at 500 C is 60W. At which temperature resistance will be 25W

The resistance of a wire at 20 C is 20 W and at 500 C is 60W. At which temperature resistance will be 25W

## How three resistance of values 2W, 3W and 6 W can be connected to give an effective resistance of 4W?

How three resistance of values 2W, 3W and 6 W can be connected to give an effective resistance of 4W?

## A particle is moving along straight line such that dot product of its acceleration a and velocity v is negative. How many times particle can be found at a distance d from the origin?

A particle is moving along a straight line such that dot product of its acceleration a and velocity v is negative. How many times particle can be found at a distance d from the origin?

## Two identical discs of mass m and of radius R touch each other and move with the same velocity perpendicularly to the line segment which joins their centres of mass, along the surface of a horizontal smooth tabletop. There is a third disc of mass M and of radius R at rest, at a point on the perpendicular bisector of the line segment joining the centres of mass of the two moving discs as shown in the figure. The two moving discs collide elastically with the third one, which is at rest. There is no friction between the rims of the discs. What should the ratio of M/m be in order that after the collision the two discs of mass m move perpendicularly to their initial velocity?

Two identical discs of mass m and of radius R touch each other and move with the same velocity perpendicularly to the line segment which joins their centres of mass, along the surface of a horizontal smooth tabletop. There is a third disc of mass M and of radius R at rest, at a point on the perpendicular bisector of the line segment joining the centres of mass of the two moving discs as shown in the figure. The two moving discs collide elastically with the third one, which is at rest. There is no friction between the rims of the discs. What should the ratio of M/m be in order that after the collision the two discs of mass m move perpendicularly to their initial velocity?

## Ram travels towards east covering 5 km. He takes a left turn and travels 10 km more. Then, he takes a right turn and travels another 5km and finally takes a right turn to cover 10 km. How far is he from his original position?

Ram travels towards east covering 5 km. He takes a left turn and travels 10 km more. Then, he takes a right turn and travels another 5km and finally takes a right turn to cover 10 km. How far is he from his original position?

## The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?

The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?

## current

A WIRE HAS LINEAR RESISTANCE P. FIND RESISTANCE R B/W PoinT A AND B IF SIDE OF LARGER SQUARE IS D

## CURRENT

A WIRE HAS LINEAR RESISTANCE P FIND RESISTANCE R B/W PT A AND B IF SIDE OF LARGER SQUARE IS D

A AND B ARE OPP POINTS ON LARGER SQUARE

## ELECRTOSTATICS

10 uc charge is uniformly distributed over thin ring of radius 1m a particle of mass 0.9 g charge 1uc is placed on axis of ring it is displaced towards centre then time period is

## thermo

1 cm3 of water at its bp absorbs 540 cal of heat to become stream with vol of 1671 cm3 if atmpressur1.013 *10^5 n/m2 and mechanical equivalent of heat =4.19 j/cal energy spent in this process in over coming intermolecular forces

## thermo

A cylindrical rod with one end in a stream chamber and other end in ice cause melting of 0.1 gm of ice/sec. If the rod is replaced with another rod of half the length and double the radius of first and thermal conductivity of second rod is 1/4 that of first, find the rate of ice melting in gm/sec

## Define 'electric line of force' and give its two important properties?

Define 'electric line of force' and give its two important properties?

## A particle moves in a straight line such that the distance covered by it in time t seconds measured t3 from a fixed point on the line is given by s = t^3/3- 16t cms. The acceleration when the velocity is zero is

A particle moves in a straight line such that the distance covered by it in time t seconds measured t3 from a fixed point on the line is given by

The acceleration when the velocity is zero is

## How many acyclic isomer(s) is/are possible with formula C4H8?

How many acyclic isomer(s) is/are possible with formula C4H8?

## How many minimum number of chlorine atom(s) does a polychloride contain, which on hydrolysis forms a beta - keto acid?

How many minimum numbers of chlorine atom(s) does a polychloride contain, which on hydrolysis forms a beta - keto acid?

## A wire of length l and resistance R is bent in the form of a ring. The resistance between two points which are separated by angle is?

A wire of length l and resistance R is bent in the form of a ring. The resistance between two points which are separated by angle is?

## Volume of a gas at a particular temperature and on atmospheric pressure is 200 ml. Keeping the temperature constant if pressure is increased to 5 atmosphere, then volume of the gas will be(if P1V1 = P2V2 )

Volume of a gas at a particular temperature and on atmospheric pressure is 200 ml. Keeping the temperature constant if pressure is increased to 5 atmosphere, then volume of the gas will be(if P1V1 = P2V2 )

## a stationary obj at 4 deg cal and weighing 3.5kg falls from height of 2000 m on snow mountain at 0 degc if temp of obj just hitting snow is 0 deg and obj comes to rest immediately obj melt at (latent heat of ice=3.5*10^5 j/s)

a stationary obj at 4 deg cal and weighing 3.5kg falls from height of 2000 m on snow mountain at 0 degc if temp of obj just hitting snow is 0 deg and obj comes to rest immediately obj melt at (latent heat of ice=3.5*10^5 j/s)

## thermdynamics - how many g of a liquid of speific heat 0.2 at a temp 40 deg cal must be mixed with 100 gm of liquid of speciic heat 0.5 at temp 20 deg cal so that final temp of mix becomes 32 dg cal

how many g of a liquid of speific heat 0.2 at a temp 40 deg cal must be mixed with 100 gm of liquid of speciic heat 0.5 at temp 20 deg cal so that final temp of mix becomes 32 dg cal

## A block of mass m is placed on an another rough block of mass M and both are moving horizontally with same acceleration a due to a force which is applied on the lower block, then work done by lower block on the upper block in moving a distance s will be?

A block of mass m is placed on an another rough block of mass M and both are moving horizontally with same acceleration a due to a force which is applied on the lower block, then work done by lower block on the upper block in moving a distance s will be?

## A particle moves on a rough horizontal ground with some initial velocity say v0. If (3/4)th of its kinetic energy is lost due to friction in time t0 then coefficient of friction between the particle and the ground is

A particle moves on a rough horizontal ground with some initial velocity say v0. If (3/4)th of its kinetic energy is lost due to friction in time t0 then coefficient of friction between the particle and the ground is?

## Two balls are dropped from the same point after an interval of 1 second. Their separation 3 second after the release of the second ball. (g = 10 m/s2)

Two balls are dropped from the same point after an interval of 1 second. Their separation 3 second after the release of the second ball. (g = 10 m/s2)

## A string of linear mass density 0.8 kg/m is stretched to a tension 500 N. The mean power required to maintain a travelling wave of amplitude of 10 mm and wavelength 0.5 m is?

A string of linear mass density 0.8 kg/m is stretched to a tension 500 N. The mean power required to maintain a travelling wave of amplitude of 10 mm and wavelength 0.5 m is?

## A particle is projected with a speed u in air at angle θ with the horizontal. The particle explodes at the highest point of its path into two equal fragments, one of the fragments moving up straight with a speed u. The difference in time in which the two particle fall on the ground is (Assume it is at a height H at the time of explosion)

A particle is projected with a speed u in air at angle θ with the horizontal. The particle explodes at the highest point of its path into two equal fragments, one of the fragments moving up straight with a speed u. The difference in time in which the two particle fall on the ground is (Assume it is at a height H at the time of explosion)

## If inside a big circle exactly 24 small circles, each of radius 2, can be drawn in such a way that each small circle touches the big circle and also touches both its adjacent small circles, then radius of the big circle is?

If inside a big circle exactly 24 small circles, each of radius 2, can be drawn in such a way that each small circle touches the big circle and also touches both its adjacent small circles, then radius of the big circle is?

## The differential equation of the system of circles touching the x-axis at origin is?

The differential equation of the system of circles touching the x-axis at origin is?

## Two particles of mass M = 3 kg each are kept on a horizontal circular platform on two mutually perpendicular radii at equal distance R = 1 m from the centre of the table. The particles are connected with a string, which is just taught when the platform is not rotating. Coefficient of friction between the platform and block is = 0.1. Then the maximum angular speed ( in rad/sec) of platform about its centre so that the blocks remain stationary relative to platform. (take g = 10 m/s2)

Two particles of mass M = 3 kg each are kept on a horizontal circular platform on two mutually perpendicular radii at equal distance R = 1 m from the centre of the table. The particles are connected with a string, which is just taught when the platform is not rotating. Coefficient of friction between the platform and block is = 0.1. Then the maximum angular speed ( in rad/sec) of platform about its centre so that the blocks remain stationary relative to platform. (take g = 10 m/s2)

## A spring is compressed between two blocks of masses m1 and m2 placed on a horizontal frictionless surface. When the blocks are released. The blocks travel distance x1 and x2 respectively before coming to rest. The ratio x1/x2 is?

A spring is compressed between two blocks of masses m1 and m2 placed on a horizontal frictionless surface. When the blocks are released. The blocks travel distance x1 and x2 respectively before coming to rest. The ratio x1/x2 is?

## A cylinder has a radius r. To what height h should it be filled with water so that the thrust on its walls is equal to that on its bottom

A cylinder has a radius r. To what height h should it be filled with water so that the thrust on its walls is equal to that on its bottom

## A swimmer can swim in still water with a speed of speed is 3 m/s. If he cross the river in the shortest possible time, what is the speed of flow of water?

A swimmer can swim in still water with a speed of speed is 3 m/s. If he cross the river in the shortest possible time, what is the speed of flow of water?

## Two balls are dropped from the same point after an interval of 1 second. Their separation 3 second after the release of the second ball?

Two balls are dropped from the same point after an interval of 1 second. Their separation 3 second after the release of the second ball? (g = 10 m/s2)

## Short question

Clianostat is associated with :-

## The number of permutations of the letters of the word HINDUSTAN such that neither the pattern ‘HIN’ nor ‘DUS’ nor ‘TAN’ appears, are

The number of permutations of the letters of the word HINDUSTAN such that neither the pattern ‘HIN’ nor ‘DUS’ nor ‘TAN’ appears, are

## Number of ways in which 7 girls & 7 boys can be arranged such that no two boys and no two girls are together is?

Number of ways in which 7 girls & 7 boys can be arranged such that no two boys and no two girls are together is?

## Number of ways in which 5 identical objects can be distributed in 8 persons such that no person gets more than one object is?

Number of ways in which 5 identical objects can be distributed in 8 persons such that no person gets more than one object is?

## The number of flags with three strips in order that can be formed using 2 identical red, 2 identical blue and 2 identical white strips is?

The number of flags with three strips in order that can be formed using 2 identical red, 2 identical blue and 2 identical white strips is

## The number of ways of selecting two numbers from the set {1, 2, ...,12} whose sum is divisible by 3 is?

The number of ways of selecting two numbers from the set {1, 2, ...,12} whose sum is divisible by 3 is?

## The C = C bond dissociation energy is 146 kcal/mole whereas C – C bond dissociation energy is 83 kcal/mole then whey paraffins are less reactive than olefins.

The C = C bond dissociation energy is 146 kcal/mole whereas C – C bond dissociation energy is 83 kcal/mole then whey paraffins are less reactive than olefins.

## Why Al(OH)3 is amphoteric in nature?

Why Al(OH)3 is amphoteric in nature?

## A diatomic molecule has dipole moment of 1.2 D. If the bond distance is 1.0 A. What fraction of an electronic charge ‘e’ exists on each atom?

A diatomic molecule has dipole moment of 1.2 D. If the bond distance is 1.0 A. What fraction of an electronic charge ‘e’ exists on each atom?

## Two positive point charge of 12 uc and 8 uc are 10 cm apart the. Work done in bringing them 4 cm close is

Two positive point charge of 12 uc and 8 uc are 10 cm apart the. Work done in bringing them 4 cm close is

## Compare the bond energies of N2, N2+ & N2-/

Compare the bond energies of

## O-nitrophenol is more volatile than p-nitrophenol. Explain?

O-nitrophenol is more volatile than p-nitrophenol. Explain?

## p-isomer will be having highest dipole moment since dipole moment of – CF3 group is reinforced to maximum extent in this case by – CH3 group. (One is electron withdrawing and other is electron releasing.

p-isomer will be having highest dipole moment since dipole moment of – CF3 group is reinforced to maximum extent in this case by – CH3 group. (One is electron withdrawing and other is electron releasing.

## The distance between poles of horse shoe magnet is 10cm and its pole strength is 10^-4 Am. The magnetic field induction at point p midway between the poles is

## The distance between poles of horse shoe magnet is 10cm and its pole strength is 10^-4 Am. The magnetic field induction at point p midway between the poles is

## Calculate the percentage of ionic character of HI having bond length = 1.62Å and observed dipole moment = 0.39 D.

Calculate the percentage of ionic character of HI having bond length = 1.62Å and observed dipole moment = 0.39 D.