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)

Anonymous User Physics 12 Sep, 2019 71 views

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?

Anonymous User Maths 09 Sep, 2019 169 views

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

Anonymous User Maths 09 Sep, 2019 74 views

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)

Anonymous User Physics 09 Sep, 2019 1480 views

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?

Anonymous User Physics 09 Sep, 2019 701 views

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

Anonymous User Physics 09 Sep, 2019 124 views

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?

Anonymous User Physics 09 Sep, 2019 70 views

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)

Anonymous User Physics 09 Sep, 2019 93 views

Clianostat is associated with :-

Anonymous User Biology 08 Sep, 2019 66 views

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

Anonymous User Maths 06 Sep, 2019 127 views

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

Anonymous User Maths 06 Sep, 2019 419 views

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

Anonymous User Maths 06 Sep, 2019 99 views

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

Anonymous User Maths 06 Sep, 2019 95 views

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

Anonymous User Maths 06 Sep, 2019 253 views

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.

Anonymous User Chemistry 04 Sep, 2019 114 views

Why Al(OH)3 is amphoteric in nature?

Anonymous User Chemistry 04 Sep, 2019 77 views

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?

Anonymous User Chemistry 02 Sep, 2019 408 views

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

Anonymous User Mathematical physics 01 Sep, 2019 155 views

Compare the bond energies of

Anonymous User Chemistry 31 Aug, 2019 889 views

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

Anonymous User Chemistry 31 Aug, 2019 181 views

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.

Anonymous User Chemistry 31 Aug, 2019 63 views

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

Anonymous User Chemistry 27 Aug, 2019 129 views

Na2CO3 does not decompose on heating whereas CaCO3 decomposes, why?

Anonymous User Chemistry 27 Aug, 2019 84 views

Among PCl3 & PF3 which is having greater bond angle and why?

Anonymous User Chemistry 27 Aug, 2019 78 views

CO2 has got dipole moment of zero why?

Anonymous User Chemistry 27 Aug, 2019 71 views

The solubility of the hydroxides of the alkaline earth metals increases i.e. Ba(OH)2 has got a higher solubility in water compared to Mg(OH)2?

Ashish Maurya Chemistry 27 Aug, 2019 66 views

The melting point of KCl is higher than that of AgCl though the crystal radii of Ag+ and K+ ions are almost same.Why?

Arpita Singh Chemistry 27 Aug, 2019 799 views

Out of H2O and H2S which is having greater bond angle and why?

Anonymous User Chemistry 27 Aug, 2019 74 views

Explain why the bond angle of H2O is 104° while that that of F2O is 102°?

Anonymous User Chemistry 27 Aug, 2019 4335 views

Why bond angle in NH3 is 107° while in H2O it is 104.5°. Though the central atom in both the molecules is sp3 hybridized.

Anonymous User Chemistry 27 Aug, 2019 228 views

Why the bond angle of H–C–H in methane(CH4) is 109° 28’ while H–N–H bond angle in NH3 is 107° though both carbon and nitrogen are sp3 hybridized.

Anonymous User Chemistry 27 Aug, 2019 116 views

Classify the following bonds as ionic, polar covalent or covalent and give your answer:

(a)  Si - Si bond in

(b)  Si - Cl bond in

(c)  Ca - F bond in CaF2

(d)  N - H bond in NH3

Anonymous User Chemistry 27 Aug, 2019 1325 views

Calculate the minimum and maximum number of electrons which may have magnetic quantum number, m = +1 and spin quantum number s = - 1/2 in chromium(Cr):

Anonymous User Chemistry 27 Aug, 2019 569 views

Graphite is a soft solid lubricant extremely difficult to smelt. The reason for this anomalous behaviour is that graphite?

Anonymous User Chemistry 26 Aug, 2019 86 views

Two particles of mass 4kg and 6kg are seperated by a distance of 20m they are moving towards each other under mutual force of attraction the centre of mass is

Anonymous User Physics 21 Aug, 2019 116 views

A circular disc of radius 20cm is cut from one edge of larger disc of radius 50cm the shift in centre of mass

Anonymous User Physics 20 Aug, 2019 361 views

A gas at ntp is suddenly compressed to 1/4th of its org vol if gamma is supported to be 3/2 then final pressure is

Anonymous User Physics 19 Aug, 2019 239 views

Boron compounds behave as Lewis acid because of?

Anonymous User Chemistry 17 Aug, 2019 93 views

it takes 2s for a sound wave to travel b/w 2 fixed points when day temp is 10deg cal if temp rise to 30 deg cal sound wave travels b/w same fixed points

Anonymous User Mathematical physics 17 Aug, 2019 87 views

Let a relation be defined on a set of functions defined on R  R such that R = {(f, g)|f – g is an even function} then, relation R is?

Anonymous User Maths 15 Aug, 2019 153 views

Out of N, O, Ne, Na, Na+, select the species which have maximum and minimum ionization energy?

Rahul Kumar Chemistry 15 Aug, 2019 1699 views

The conversion of ozone into oxygen is exothermic under what conditions is ozone is most stable?

Anonymous User Chemistry 15 Aug, 2019 608 views

A uniform solid hemisphere of radius 10 m and mass 64 kg is placed with its curved surface on the smooth horizontal surface and a string AB of length 4m is attached to point A on its rim as shown in the figure. Find the tension in the string if hemisphere is in equilibrium.

Anonymous User Physics 15 Aug, 2019 398 views

A uniform rod of mass M and length L is free to rotate about a frictionless pivot located L/3 from one end. The rod is released from rest incrementally away from being perfectly vertical, resulting in the rod rotating clockwise about the pivot. When the rod is horizontal, what is the magnitude of the tangential acceleration of its center of mass?

Anonymous User Physics 14 Aug, 2019 140 views

A triangular frame consists of three identical rods, each of mass m and length l. It rests upright on a horizontal smooth surface with its lower right corner against a stop about which the frame could pivot. A horizontal force of magnitude F is applied to the upper corner of the frame as shown in the figure. What is the largest value of F may have without causing the frame to pivot upward about the stop?

Anonymous User Physics 11 Aug, 2019 138 views

A uniform, solid cylinder having mass M and radius R is pulled by a horizontal force F acting through the center as shown. The cylinder rolls to the right without slipping. What is the magnitude of the force of friction between the cylinder and the ground?

Anonymous User Physics 11 Aug, 2019 208 views

If a is square matrix of order 3 such that adja=64 find |a|

Anonymous User Maths 09 Aug, 2019 86 views