If C and R denote capacity and resistance, the from Class Physics Units and Measurement

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NEET Physics : Units and Measurement

Multiple Choice Questions

21.

If the units of length, mass and force are chosen as fundamental units, the dimensions of time would be

  • [ M1/2 L-1/2 F1/2 ]

  • [ M1/2 L1/2 F1/2 ]

  • [ M1/2 L1/2 F-1/2 ]

  • [ M1/2 L-1/2 F-1/2 ]



22.

Dimension of LRCV is

  • [A-1]

  • [A-2]

  • [A]

  • [A2]



23.

A physical quantity X is given by X =  The percentage error in the measurement of k, l,  m  and n are 1 %, 2%, 3% and 4% respectively. The value of X is uncertain by

  • 8%

  • 10%

  • 12%

  • None of these



24.

The length, breadth and thickness of a block are given by l = 12 cm, b = 6 cm and t = 2.45 cm. The volume of the block according to the idea of significant figures should be:

  • 1 × 102 cm3

  • 2 × 102 cm3

  • 1.763 × 102 cm3

  • none of the above



25.

The length, breath and thickness of a block are given by l = 12 cm, b= 6 cm and t = 2.45 cm. The volume of the  block according to the idea of significant figure should be

  • 1 x 102 cm2

  • 2 x 102 cm3

  • 1.763 x 102 cm2

  • None of these



26.

If an error in measurement of radius of a sphere is 1%, what will be the error in the measurement of volume?

  • 1 %

  • 1.3 %

  • 3 %

  • 10 %



27.

The dimensional formula for Young's modulus is

  • [ML-1T-2]

  • [M0LT-2]

  • [MLT-2]

  • [ML2T-2]



28.

If C and R denote capacity and resistance, the dimensions of C R are :

  • M0L0T

  • ML0T

  • M0L0T2

  • not expressible in terms of M, L and T



29.

Dimensions of torque is

  • [M1L2T-2]

  • [M2L2T2]

  • [M-1LT-1]

  • [M-2L-2T-2]



30.

If x = ε0 lVtis the permittivity of free space, l is length, V is potential difference and t is time. The dimensions of x are same as that of

  • charge

  • resistance

  • voltage

  • current



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