Class XI

The number of degrees of freedom a diatomic molecule is
  1. 5.0
  2. 4
  3. 3
  4. 2
According to Atomic Hypothesis: little particles of atom
  1. repel each other when they are at small distance apart, but repel upon being squeezed into one another
  2. repel each other when they are at large distance apart, but attract upon being separated from one another
  3. attract each other when they are at small distance apart, but repel upon being squeezed into one another
  4. repel each other when they are at small distance apart, but attract upon being squeezed into one another
if particles A and B are moving with velocities vAvA and vBvB (each with respect to some common frame of reference, say ground.). Then, velocity of particle A relative to that of B is
  1. vABvAB = - vAvA - vB
  2. vABvAB = vAvA - vB
  3. vABvAB = vAvA + vB
  4. vABvAB = - vAvA +vB
Magnitude of displacement of a particle is
  1. is less than the path length of the particle between two points
  2. is either less or equal to the path length of the particle between two points
  3. is equal to the path length of the particle between two points
  4. is more than the path length of the particle between two points
Which of the following algebraic operations on vectors not permissible?
  1. adding any two vectors
  2. multiplying any vector by any scalar,
  3. adding a scalar component of the vector to the same vector
  4. multiplying the sum of vectors A and B by a scalar
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