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Modern Scientific Developments

Chapter: Science & Technology

Question 1 of 2 NDA MCQ

Which of the following statements with regard to the Square Kilometer Array (SKA) project is/are correct?

1.SKA is a state of the art, mega science international facility to build the world’sbiggest and most sensitive radio telescopefor addressing a wide variety of cutting-edge science goals

2. The Government of India has accorded its approval for India’s participation in the international mega science project.

Select the answer using the code given below:

Detailed Explanation

Correct Answer

✓ Option C is correct. Both statements regarding the Square Kilometer Array (SKA) project are true.

📖 Core Anchor Concept

The Square Kilometer Array (SKA) project is an international initiative aimed at creating the world's largest and most sensitive radio telescope, which will significantly advance our understanding of the universe.

📜 Detailed Breakdown & Chronology

  • Statement 1: The SKA is designed to address a variety of scientific goals, including the study of cosmic magnetism, the formation of galaxies, and dark energy.
  • Statement 2: India has been granted participation in this mega science project, marking its commitment to contributing to global astronomical research.

🔍 Option Analysis

  • Option A: Incorrect, only statement 1 is true.
  • Option B: Incorrect, only statement 2 is true.
  • Option D: Incorrect, both statements are true.

⚡ Chronology Trick / Polity Mnemonic

Remember: SKA = Scientific Knowledge Advancement. This can help you associate the initiative with its primary objective.

📖 Factual Verification & Reference

📖 Factual Verification & Reference:

Verified against the official SKA website and Ministry of Earth Sciences publications.

Question 2 of 2 NDA MCQ

Who among the following has explained the phenomenon of photoelectric effect ?

Detailed Explanation

Correct Answer

✓ Option B is correct. Albert Einstein explained the phenomenon of the photoelectric effect.

📖 Governing Law / Core Concept

The photoelectric effect can be explained by Einstein's equation:

\[ E = hf - \phi \]

where \( E \) is the energy of emitted photoelectrons, \( h \) is Planck's constant, \( f \) is the frequency of incident light, and \( \phi \) is the work function.

🧪 Step-by-Step Breakdown

The photoelectric effect refers to the emission of electrons from a material when it absorbs light. The key steps include:

  • The absorption of photons by electrons in a material.
  • The conversion of photon energy to kinetic energy of the ejected electrons.
  • Threshold frequency must be met for emission to occur, indicated by the work function.

🔍 Option Analysis

  • A. Max Planck: Proposed quantization of energy but did not explain the photoelectric effect.
  • C. Neils Bohr: Developed the model of the atom, focusing on electron orbits but not specifically on the photoelectric phenomenon.
  • D. Ernest Rutherford: Known for the nuclear model of the atom but unrelated to the photoelectric effect.

⚡ Mnemonic / Speed-Run

Remember Einstein’s contribution with the phrase: “Energy from light knocks out electrons” to recall the essence of the photoelectric effect.

📖 Factual Verification & Reference

📖 Factual Verification & Reference:

Verified against NCERT Class XII Physics, Chapter 11 (Dual Nature of Radiation and Matter).

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