Important Questions of Units and Measurement Physics | Zigya

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91.

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


92.

If σ = surface change density, ε = electric permittivity, the dimensions of σε is same as

  • electric force

  • electric field intensity

  • pressure

  • electric charge


93.

A gas bubble forms an explosion under water which oscillate with a period T ∝ paρbEc, where p is the static pressure, ρ is the density ofwater and E is the total energy of explosion. Then, the values of a, b and c will be

  • - 56, 12, 13

  • 25, 13, 14

  • 45, 98, 12

  • 32, 14, 56


94.

The physical quantity having dimensions [M-1L-3T3A2] is

  • resistance

  • resistivity

  • electrical conductivity

  • electromotive force


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95.

The dimensions of σb4 are (where, σ = Stefan's constant and b = Wein's constant).

  • [ M0L0T0 ]

  • [ ML4T-3 ]

  • [ ML-2T ]

  • [ ML6T-3 ]


96.

The SI unit of gravitational potential is

  • J

  • J-kg-1

  • J-kg

  • J-kg2


97.

The potential energy of a particle varies with distance x from a fixed origin as V = Axx + B ; where A and B are constants. The dimensions of AB are

  • ML5/2T-2

  • ML2T-2

  • M3/2L3/2T-2

  • ML7/2T-2


98.

The dimensions of kinetic energy is

  • [M2L2T]

  • [ML2T]

  • [ML2T-2]

  • [ML2T-1]


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99.

If the figure below represents a parabola, identify the physical quantities  representing Y and X for constant acceleration

  • X = time, Y = velocity

  • X = velocity, Y = time

  • X = time, Y= displacement

  • X = time, Y = acceleration


100.

The dimensional formula of magnetic flux is

  • [MLT-2A-1]

  • [ML2T-1A-1]

  • [ML2T-1A-2]

  • [ML2T-2A-1]


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