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CBSE

NEET Physics : Units and Measurement

Multiple Choice Questions

31.

If σ = surface change density, ε = electric permittivity, the dimensions of $\frac{σ}{ε}$ is same as

electric force
electric field intensity
pressure
electric charge

32.

A physical quantity A is related to four observables a, b, c and d as follows :

$A = \frac{a^{2} b^{3}}{c \sqrt{d}}$ . The percentage errors of measurement in a, b, c and d are 1%, 3%, 2% and 2% respectively. What is the percentage error in the quantity A ?

12 %
7 %
5 %
14 %

33.

The dimensions of kinetic energy is

[M²L²T]
[ML²T]
[ML²T^-2]
[ML²T^-1]

34.

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

resistance
resistivity
electrical conductivity
electromotive force

35.

The potential energy of a particle varies with distance x from a fixed origin as $V = (\frac{A \sqrt{x}}{x + B})$ ; where A and B are constants. The dimensions of AB are

$[{ML}^{5 / 2} T^{- 2}]$
$[{ML}^{2} T^{- 2}]$
$[M^{3 / 2} L^{3 / 2} T^{- 2}]$
$[{ML}^{7 / 2} T^{- 2}]$

36.

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

37.

The dimensional formula of magnetic flux is

[MLT^-2A^-1]
[ML²T^-1A^-1]
[ML²T^-1A^-2]
[ML²T^-2A^-1]

38.

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

[ M⁰L⁰T⁰ ]
[ ML⁴T^-3 ]
[ ML^-2T ]
[ ML⁶T^-3 ]

39.

The SI unit of gravitational potential is

J
J-kg^-1
J-kg
J-kg²

40.

A gas bubble forms an explosion under water which oscillate with a period T ∝ p^aρ^bE^c, 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

$- \frac{5}{6}, \frac{1}{2}, \frac{1}{3}$
$\frac{2}{5}, \frac{1}{3}, \frac{1}{4}$
$\frac{4}{5}, \frac{9}{8}, \frac{1}{2}$
$\frac{3}{2}, \frac{1}{4}, \frac{5}{6}$

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Subject

NEET Physics : Units and Measurement

Multiple Choice Questions