Questions asked by Sheetal Sinha

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• A particle starts from rest with an acceleration of #2# #ms^-2# for #20# #s# and then comes to rest within next #20# #s# with retarding acceleration #2# #ms^-2#. How would you express the motion on a v t graph?
  
• Draw the structure of O3 and represent the coordinate bon d in it by drawing its structure?
  
• Covalent bonds are directional in nature. Explain?
  
• If a projectile is thrown obliquely both at earth and moon and the angle of projection with the horizontal and the initial speed of throw is same in both earth and moon then which projectile will cover the maximum height?
  
• An aircraft flying horizontally at a height of 2Km with a speed 200m/s passes directly overhead an anti aircraft gun. At what angle from the vertical should the gun be fired so that a shell with muzzle speed 600 m/s may hit the plane? (Take g=10 m/s)
  
• Hey ,I am too much confused in taking the sign of g (means in equations like F=mg g should be eq ual to -9.8m/s2 or 9.8m/s2? Please answer with complete explanation..
  
• An object with mass 0.05 kg is falling downwards under the influence of g.Find the force acting on it? .take g 10m/s2 Now answer me why should we take g 10 not -10
  
• A particle moves from A to B with constant velocity u and comes back with constant velocity v.Derive formula of average speed of the whole journey?
  
• What is the magnitude of the vector 3i-j+2k in the direction of 30° from the above vector?
  
• Why frictional force is non conservative force?
  
• |-(r+q)|=|r+q| why? If we are removing - sign then mode should also be removed...I am confused?
  
• The interior angle of a polygon can't exceed??
  
• A force of 3kgf is just sufficient to pull a block of 5kgf .Find the coefficient of friction and angle of Friction?
  
• Importance of formal charge?
  
• Where we should put an arrow to represent Coordinate bond in O3?
  
• How to locate the position of element with atomic number 120 which is not yet discovered ?
  
• How many molecules are present in 1kg mole of a substance?
  
• Name and give symbol of the undiscovered element which have atomic number 119 by iupac method?
  
• A ball thrown vertically upwards with a velocity 20m/s.It takes 4 seconds to return to its original am position .Draw its v-t graph?
  
• What do you mean by this ' static frictional force is self adjusting force'.Explain?
  
• Frictional force is non Conservative force.How?
  
• Why frictional force is non conservative force?
  
• Solve 6x<24 where x belongs to rational number and draw the graph of solution set?
  
• Find the Value of tan 1800°?
  
• Is sin x+ cos x=1 is a trigonometric equation?If yes why ?
  
• Solve the following quadratic equations x^2-(5-i)x+(18+i)=0?
  
• Find the coordinates of the foot of perpendicular drawn from the point (2,3) to the line 3x-4y+7=0?
  
• What should be the value of * so that the number 2*345 is divisible by 9?
  
• If 2nP3=100×nP2 find n?(This is a question from permutation)
  
• A car is travelling at the rate of 75km/hr.Find the distance covered in 9 whole 1/2 hr.Also find the time taken to cover a distance of 975 km?
  
• A Ma deposited some money in the bank on 7-2-2009 for 1000 days.find the day on which he can withdraw his money?
  
• If there are 6 periods on each working day of a school,in how many ways can one arrange 5 subjects such that each subject is allowed at least one period?
  
• Why gravitational potential energy always have a negative sign?Also explain the graph of variation of gravitational potential energy with distance r from the centre of the earth?
  
• A child has three plastic toys bearing the digits 3,3,5 respectively.How many 3-digit numbers can he make using them? Please solve this question without using the formula of permutations of objects not all different which is given by n!/P!×q!.
  
• A bus X is travelling with a speed of 40 km/hr towards North.Another bus Y is travelling with a speed of 30km/hr towards East. The velocity of bus X with respect to bus Y is?
  
• Evaluate the following limits lim x tends to 0[√3+x – √5-x]/x^2–1?
  
• We wish to select 6 persons from 8, but if the person A is chosen ,then B mist be chosen.In how many ways can the selection be made?
  
• Approx value of 1/e?
  
• Balance the chemical equation by using oxidation number method (not by ion electron method) [Cr(OH)4]^- + H2O2 --->CrO4^2- + H2O(Basic medium)?
  
• If a body strikes a rigid wall with some velocity making an angle theta with the normal and bounces back with the same velocity then the angle made with the normal will be same or not?
  
• Boric acid can take only one electron pair due to absence of d orbital.What does this means?
  
• Find x if x^2-1>0?
  
• The number of real solutions of the equation [9/x]^x=-3+x-x^2 is?
  
• In a series of 2n observations, half of them equal a and remaining half -a.If the standard deviation of the observations is 2,then |a| equals ?
  
• The number of real solutions #cos(e^x)=2^x + 2^-x# is ?
  
• If alpha and beta are the roots of the equation x2+x+1=0,then the equation whose roots are alpha^19 and beta^17 is ?
  
• Which type of intermolecular forces exist between (a)#H_2S# molecules (b)#Cl_2# and #C Cl_4# molecules?