Questions asked by shreyansh gupta

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• Please answer this problem with full explanation and tell me how can i do these kind of q in competitions?
  
• If the velocity of car is increased by 20% then minimum distance in which it can be stopped increases by ? 1. 44% 2. 55% 3. 66% 4. 88%
  
• A stone weighing 3 kg falls from top of a tower 100 m high and buries itself 2m deep in the sand . what is the time of penetration of the stone ? options:- 1. 0.09s 2. 0.9s 3. 2.1s 4. 1.3s
  
• A particle is moving in a straight line with initial velocity u and uniform acceleration f. if the sum of the distances travelled in t and t+1 seconds is 100 cm, then its velocity after t seconds in cm/s is ?
  
• A particle under the action of a constant force moves from rest upto 20 seconds. if distance covered in first 10 seconds is s1 and then covered in nest 10 seconds is s2 then ? 1. s1=s2 2.s2=3s1 3. s2=2s1 4. s2=4s1
  
• A body moves with uniform acceleration a and zero initial velocity. another body B starts from the same point and moves in same direction with constant velocity v. the two bodies meet after a time t. the value of t is ?
  
• A particle starts sliding down a friction-less plane. if #S_n# is the distance traveled by it from #n-1# seconds to #n# seconds, the ratio #S_n/S_(n+1)# is ?
  
• A wire is bent in the shape of a square then the area of the square is 81 sq. cm. when the wire is bent into a semicircular shape, the area of circle will be ?
  
• A balloon is flying up with a velocity of 5 m/s. at a height of 100 m a stone is dropped from it . at the instant the stone reaches the ground level the height of balloon will be ?
  
• A particle travels 10 m in first 5 s and 10 m in next 3 s . assuming constant acceleration what is the distance traveled in the next 2 s ?
  
• What is the value of ?
  
• The number #107^90 - 76^90# is divisible by ?
  
• Four cells each of internal resistance 1 ohm and e.m.f. 1.9v are connected to a external resistance of 18 ohm. find the terminal potential difference of this combination?
  
• Four cells each of internal resistance 1 ohm and e.m.f. 1.9v are connected to a external resistance of 18 ohm.the cells are connected in pair of two. the two pairs are connected in parallel . find the terminal potential difference of this combination?
  
• Two identical heaters 240v, 1000W are connected in series across a 240v supply the combined power is?
  
• For the network shown in the figure find the value of current i ?
  
• 10 g sample of a mixture of CaCl2 and NaCl is treated to precipitate all the calcium as CaCO3. this CaCO3 is heated to convert all the Ca to CaO and final mass of CaO is 1.68g the mass % of CaCl2 in original mixture is ?
  
• The acceleration-time graph of a particle moving in a straight line is as shown in figure. The velocity of the particle at time t = 0 is 2 m/s. The velocity after 2 seconds will be ?