Refractive Index | Physical Chemistry | GPAT Mock Test

Welcome to the Quiz!

This mock test is designed specifically for GPAT aspirants to test their knowledge on the topic of Refractive Index from Physical Chemistry. You will find 25 multiple-choice questions covering key subtopics like the fundamental concept of refractive index, specific and molar refractivity, the Lorentz-Lorenz equation, and the working principles of various refractometers like Abbe’s and Pulfrich. This quiz will help you assess your understanding, identify areas for improvement, and get accustomed to the question patterns for the exam. After submitting your answers, you can review your score and see the correct solutions. You can also download all the questions with their correct answers in a PDF format for future revision. Good luck!

1. The refractive index (n) of a medium is defined as the ratio of:

2. According to the Lorentz-Lorenz equation, specific refractivity (r) is given by:

3. Molar refractivity (Rm) is a property that is both:

4. The working principle of an Abbe’s refractometer is based on the measurement of the:

5. How does an increase in temperature generally affect the refractive index of a liquid?

6. Molar refractivity (Rm) is related to specific refractivity (r) and molecular weight (M) by the equation:

7. The standard wavelength of light used for most refractive index measurements, known as the D-line, is emitted by which element?

8. A key advantage of specific refractivity over refractive index is that it is largely independent of:

9. Which type of refractometer is most suitable for determining the refractive index of solid, opaque samples?

10. The phenomenon where the refractive index of a substance varies with the wavelength of light is known as:

11. In pharmaceutical analysis, refractometry can be used to determine the:

12. What is the approximate refractive index of a vacuum?

13. Molar refractivity values are instrumental in:

14. Snell’s Law is mathematically expressed as:

15. What is the unit of Molar Refractivity?

16. An Immersion refractometer is particularly useful for measuring the refractive index of:

17. A higher refractive index value for a medium implies that light travels:

18. The prisms in an Abbe’s refractometer are typically made of high refractive index glass such as:

19. The total molar refractivity of a molecule can be estimated by summing the:

20. In the Lorentz-Lorenz equation, the term ‘d’ represents the:

21. Which of the following substances has the highest refractive index?

22. Refractometry is a useful tool in quality control for assessing the purity of substances like:

23. For a mixture of two miscible liquids, the specific refractivity is:

24. What components in an Abbe’s refractometer are used to eliminate the effect of dispersion and produce a sharp black-white borderline?

25. Refractive index is a physical property that is useful in identifying a substance and assessing its purity. This property is considered: