Welcome to Units and Measurement NEET MCQ, your essential guide to mastering the fundamentals of units and measurements! In this comprehensive collection of multiple-choice questions (MCQs), each question is thoughtfully accompanied by both the correct answer and a detailed explanation. Designed specifically for NEET (National Eligibility-cum-Entrance Test) preparation, these MCQs serve as a powerful tool to not only test your knowledge of units and measurements but also to provide you with a thorough understanding of the subject.

## 1. Which of the following is the SI unit of force?

### Answer:

### Explanation:

The SI (System International) unit of force is the Newton (N).

## 2. How many significant figures are in the number 0.005600?

### Answer:

### Explanation:

The significant figures in the number are 5, 6, and 0 after the 6.

## 3. What is the unit of luminous intensity in the SI system?

### Answer:

### Explanation:

The SI unit for luminous intensity is Candela.

## 4. 1 micron is equal to:

### Answer:

### Explanation:

1 micron is equivalent to 10^-6 meters.

## 5. The dimensional formula for gravitational constant (G) is:

### Answer:

### Explanation:

Dimension of G is [M^-1 L^3 T^-2].

## 6. Which is a scalar quantity?

### Answer:

### Explanation:

Mass is a scalar as it has magnitude only without direction.

## 7. The number of significant figures in 0.06900 is:

### Answer:

### Explanation:

The significant figures are 6, 9, and the two zeroes after 9.

## 8. If the actual length of an object is 4.5 cm and the measured length is 5.0 cm, the relative error is:

### Answer:

### Explanation:

Relative error = (Measured value – Actual value) / Actual value = (5.0 – 4.5) / 4.5 = 0.11.

## 9. The unit of Planck's constant is:

### Answer:

### Explanation:

Planck's constant (h) has a unit of Joule second (Js).

## 10. Which is a fundamental unit?

### Answer:

### Explanation:

Kelvin is a fundamental unit representing temperature.

## 11. Parsec is a unit of:

### Answer:

### Explanation:

Parsec is a unit of astronomical distance.

## 12. One atmospheric pressure is equal to:

### Answer:

### Explanation:

One atmospheric pressure is equivalent to 760 mm of mercury column.

## 13. The dimensions of impulse are equivalent to:

### Answer:

### Explanation:

Impulse and momentum both have dimensions [MLT^-1].

## 14. Light year is a unit of:

### Answer:

### Explanation:

A light year is the distance light travels in one year.

## 15. The number 0.00678 rounded off to three significant figures is:

### Answer:

### Explanation:

Rounding off to three significant figures, the number becomes 0.0068.