CBSE  /  Class 11  /  Physics  /  Units and Measurements

  • 1. 
    Physical quantities are

  • quantities such as degrees, radians and steradians
  • quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity
  • quantities such as pounds, dollars and rupees
  • quantities such as kilos, pounds and gallons

  • 2. 
    Which of the following pairs has the same dimensions?

  • specific heat and latent heat
  • lmpulse and momentum
  • surface tension and force
  • moment of lnertia and torque

  • 3. 
    The dimensions of kinetic energy is

  • [M 2L2T]
  • [ML 2T]
  • [ML 2T-2]
  • [ML 2T-1]

  • 4. 
    A force F is given by F = at + bt², where t is time. What are the dimensions of a and b?

  • MLT-1 and MLT0
  • MLT-3 and ML2T4
  • MLT-4 and MLT1
  • MLT-3 and MLT-4

  • 5. 
    The atmospheric pressure is 106 dyne/cm². What is its value in SI unit?

  • 105 newton/m²
  • 106 newton/m²
  • 104 newton/m²
  • 103 newton/m²

  • 6. 
    In a system of units if force (F), acceleration (A) and time (T) are taken as fundamentals units then the dimensional formula of energy is

  • FA2T
  • FAT2
  • FA2T
  • FAT

  • 7. 
    If force (F), work (W) and velocity (v) are taken as fundamental quantities. What is the dimensional formula of time (T)?

  • [WFv]
  • [WFv-1]
  • [W-1F -1v]
  • [WF-1v -1]

  • 8. 
    The dimensions of kinetic energy is same as that of

  • force
  • pressure
  • work
  • momentum

  • 9. 
    Which of the following groups have different dimensions?

  • Potential difference, EMF, voltage
  • Pressure, stress, Youngs modulus
  • Heat, energy, work done
  • Dipole moment, electric flux, electric field

  • 10. 
    ML-1T -2 is the dimensional formula of

  • magnetic induction
  • self-inductance
  • electric potential
  • electric field
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