Questions asked by Maya

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• The crystalline salt Na2SO4.xH2O on heating loses 55.5% of its weight the formula of crystalline salt is??? a)Na2SO4.5H2O b)Na2SO4.7H2O c)Na2SO4.2H2O d)Na2SO4.10H2O e)Na2SO4.6H2O
  
• 20 mL of methane is completely burnt using 50 mL of oxygen. The volume of the gas left after cooling to room temperature is? A) 80 B)40 C) 60 D) 30
  
• Atomic radius is of order #10^-8# cm and nuclear radius is of order #10^-13#. calculate what fraction of atom is occupied by nucleus?
  
• A particle of charge #-2*10^-9#C is acted on by a downward electrostatic force of #3*10^-6# N when placed in this field. The gravitational and electrostatic force respectively exerted on a proton placed in this field are???
  
• The electric field intensity at P and Q in the shown arrangement are in the ratio???
  
• Two vectors A nd B are such that A+B=C nd #A^2+B^2=C^2# angle btw them??
  
• What will be the ratio of the wavelength of the first line to that of the second line of paschen series of H atom? A)256:175 B)175:256 C)15:16 D)24:27
  
• Which alkane would have only primary and tertiary carbon? A) Pentane B) 2- Methybutane C) 2,2 - Dimethyl propane D) 2,3 - Dimethyl butane
  
• 0.5 g of a base was completely neutralised by 100 ml of 0.2 N acid. equivalent weight of the base is??
  
• Correct order of freezing point of given solution ? 1) 0.1 M glucose 2) 0.2 M urea 3) 0.1 M NaCl 4) 0.05 M #CaCl_2#
  
• For a first order reaction the value of rate constant for the reaction #A(g) -> 2B(g) + C(s)#?
  
• A wheel has angular acceleration of 3 rad/sec² and an initial angular speed of 2 rad/sec. In a time of 2sec it has rotated through an angle of (in radians)?
  
• A particle moves along a circle of radius #20/π# m with constant tangential acceleration. If the velocity of the particle is 80 m/s at the end of the second revolution after motion has began the tangential acceleration is ??
  
• A body revolves with a constant speed v in a circular path of radius r . The magnitude of its average acceleration during motion between 2 points in diametrically opposite direction is --- ??
  
• A potentiometer consist of a wire of length 4 m and resistance 10 ohm. It is connected to a cell of emf 2 V . The potential difference per unit length of the wire will be? 1) 5 V/m 2) 2 V/m 3) 0.5 V/m 4) 10 V/m
  
• Ten identical cells connected in series are needed to heat a wire of length 1 m and radius r by 10°C in time t. How many cells will be required to heat the wire of length 2 m of same radius by the same temperature in time t??
  
• A cell sends a current through a resistance R for time t. Now the same cell sends current through another resistance r for the same time. If same amount of heat is developed in both the resistance then the internal resistance of cell is?
  
• Two cells of emf e1 and e2 are joined in series and the balancing length of the potentiometer. wire is 625 cm. if the terminals of e1 are reversed the balancing length obtained is 125 cm. given e2>e1 the ratio e1:e2 will be?
  
• Two batteries of different emf and internal resistance connected in series with each other and with an external load resistor.current is 3A. when polarity of one battery is reversed current becames 1 A ratio of emf of two batteries is?
  
• A mass of 1 kg is thrown up with velocity of 100 m/s. After 5 second it explodes into 2 parts. One part of mass 400 g move down with a velocity 25 m/s. Calculate the velocity of other part just after explosion?? (g=10 m/s²)
  
• A bullet of mass 2 Kg is having a charge of 2mc. Through what potential difference must it be accelerated, starting from rest, to aquire a speed of 10m/s?
  
• Two electron are moving towards each other with a velocity of #10^6 m/s# what will be the closest distance of approach between them?
  
• 1000 small water drops each of capacitance c. join Together to form one large spherical drop. the capacitance of the bigger sphear is?