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CBSE

Subject

Physics

NEET Physics : Units and Measurement

Multiple Choice Questions

21.

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

22.

The dimensional formula for Young's modulus is

[ML^-1T^-2]
[M⁰LT^-2]
[MLT^-2]
[ML²T^-2]

23.

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

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.

If x = $\frac{ε_{0} lV}{t}$ is 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

26.

Dimension of $\frac{L}{RCV}$ is

[A^-1]
[A^-2]
[A]
[A²]

27.

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 %

28.

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

[ M^1/2 L^-1/2 F^1/2 ]
[ M^1/2 L^1/2 F^1/2 ]
[ M^1/2 L^1/2 F^-1/2 ]
[ M^1/2 L^-1/2F^-1/2 ]

29.

Dimensions of torque is

[M¹L²T^-2]
[M²L²T²]
[M^-1LT^-1]
[M^-2L^-2T^-2]

30.

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

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