Physics-
General
Easy

Question

Sound waves have the following frequencies that are audible to human beings

  1. 5 c/s    
  2. 27000 c/s    
  3. 5000 c/s    
  4. 50,000 c/s    

The correct answer is: 5000 c/s

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Assertion : If dot product and cross product of stack A with rightwards arrow on top text  and  end text stack B with rightwards arrow on top are zero, it implies that one of the vector stack A with rightwards arrow on top text  and  end text stack B with rightwards arrow on top must be a null vector
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If vertical line stack A with rightwards arrow on top plus stack B with rightwards arrow on top vertical line equals vertical line stack A with rightwards arrow on top vertical line equals vertical line stack B with rightwards arrow on top vertical line then angle between stack A with rightwards arrow on top text  and  end text stack B with rightwards arrow on top text  will be: end text

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physics-General
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P, Q and R are three coplanar forces acing at a point and are in equilibrium Given P = 1.9318 kg wt, sin theta subscript 1 end subscript = 0.9659, the value of R is (in kg wt)

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An object of m kg with speed of v m/s strikes a wall at an angle theta and rebounds at the same speed and same angle The magnitude of the change in momentum of the object will be :

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If stack P with rightwards arrow on top equals stack Q with rightwards arrow on top then which of the following is NOT correct :

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