# Physics and Measurement (NEET (NTA-National Eligibility cum Medical Entrance Test) Physics): Questions 23 - 27 of 62

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## Question number: 23

» Physics and Measurement » Fundamental and Derived Units. Least Count

Assertion-Reason▾

### Assertion (Ꭺ)

L/R and CR both have same dimensions.

### Reason (Ꭱ)

L/R and CR both have dimension of time.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

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## Question number: 24

» Physics and Measurement » Errors in Measurement

MCQ▾

### Question

Which of the following pairs have same dimensions?

### Choices

Choice (4) Response

a.

Energy and wavelength

b.

Torque and Energy

c.

Angular momentum and work

d.

Energy and Young’s modulus

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## Question number: 25

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

### Question

X = 3YZ 2 find dimensions of Fin (MKSA) system, if X and Z are the dimensions of capacity and magnetic field respectively

### Choices

Choice (4) Response

a.

[M -3 L -2 T -4 A -1]

b.

[M -3 L -2 T 8 A 4]

c.

[M -3 L -2 T 4 A 4]

d.

[M L -2]

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## Question number: 26

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

### Question

Number of particles crossing unit area perpendicular to X-axis in unit time is given by n =-D n 2 - n 1 x 2 - x 1

, where n1 and n2 are number of particles per unit volume in the position x1 and x2. Find dimensions of D called as diffusion constant.

### Choices

Choice (4) Response

a.

[M 0 L T 2]

b.

[M0 L2 T -4]

c.

[M 0 L 2 T -1]

d.

[M 0 L T -3]

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## Question number: 27

» Physics and Measurement » Accuracy and Precision of Measuring Instruments

MCQ▾

### Question

A wire has a mass 0.3 + 0.003g, radius 0.5 + 0.005 mm and length 6 + 0.06 cm. The maximum percentage error in the measurement of its density is

### Choices

Choice (4) Response

a.

1

b.

4

c.

2

d.

3

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