Basic Science MCQs for RAS
Practice 20 free basic science multiple choice questions for RAS exam. Instant answers with explanations in Hindi and English.
Strengthen your Basic Science knowledge for RAS with our free curated MCQ set. Every question follows real Rajasthan exam patterns. Switch between Hindi and English, and practice daily to build confidence before the exam.
RAS — Basic Science
20 Questions • Instant results & explanations • Hindi & English
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Question 1 of 20
Which mineral is also known as 'Harsont'?
Question 2 of 20
In a Wheelbarrow, where is the Fulcrum located?
Question 3 of 20
What happens chemically when the sodium or potassium salts of carboxylic acids are exposed to hard water?
Question 4 of 20
Consider the following statements regarding the classification of science: I. Physical Science deals with the study of non-living matter and energy. II. Formal Science includes Mathematics, Logic, and Statistics. Which of the statements given above is/are correct?
Question 5 of 20
In the context of the dispersion of white light, what dictates the distinct angles at which different colors bend upon passing through a prism?
Question 6 of 20
Deoxyribonucleic acid (DNA) is the master molecule containing the intricate genetic instructions necessary for the development, functioning, and reproduction of all known living things. Exploring the exact structural chemistry and interactions of DNA is a primary research focus of:
Question 7 of 20
Consider the mathematical expressions used in basic optics. If 'f' represents focal length, 'v' represents image distance, and 'u' represents object distance, which option correctly states the Mirror Formula and the Lens Formula respectively?
Question 8 of 20
Which mild, non-corrosive salt acts as an effective antacid by neutralizing excess stomach acidity?
Question 9 of 20
Which of the following represents the correct chemical formula for Rust?
Question 10 of 20
Match the fundamental atomic descriptors in List-I with their accurate mathematical derivations in List-II: List-I: A. Atomic Number (Z) B. Mass Number (A) C. Number of Neutrons List-II: 1. A minus Z 2. Protons plus Neutrons 3. Equals the number of Protons Choose the correct code:
Question 11 of 20
The phenomenon of vibrant colors observed on the surface of a thin soap bubble when exposed to sunlight is primarily a demonstration of which optical principle?
Question 12 of 20
What is the primary role of the 'Solvay process' in industrial chemistry?
Question 13 of 20
A student sitting at the back of a lecture hall is unable to clearly read the writing on the blackboard but can read a textbook placed on their desk perfectly. Which optical lens must be medically prescribed to correct this specific visual defect?
Question 14 of 20
According to Rutherford, electrons revolve around the nucleus in which type of path?
Question 15 of 20
Consider the following statements regarding the fundamental laws of refraction: 1. The incident ray, the refracted ray, and the normal at the point of incidence do not lie in the same plane. 2. Snell's Law states that the ratio of the sine of incidence to the sine of refraction is constant for a given pair of media. Which of the statement(s) provided is/are scientifically accurate?
Question 16 of 20
Which physical process is fundamentally responsible for the phenomenon of 'Joule Heating' when an electric current flows through a conductor?
Question 17 of 20
Which acid is present in the sting of a red ant or honey bee that causes burning sensation?
Question 18 of 20
Given below are two statements, one labeled as Assertion (A) and the other as Reason (R): Assertion (A): The competitive exam curriculum heavily emphasizes "Physics in Everyday Life." Reason (R): It tests the candidate's scientific temper and their ability to apply physical laws rather than just rote memorization. In the context of the above two statements, which one of the following is correct?
Question 19 of 20
Liquefied Petroleum Gas (LPG) is primarily an aliphatic mixture of which of the following gases?
Question 20 of 20