Science – Hard Level – GK Questions

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Showing 21–40 of 135 questions
science hard MCQ Chemistry - Perovskite Photovoltaics UPSC CSE, SSC Scientific Assistant, CSIR NET

Perovskite solar cells suffer from instability primarily due to:

  1. Moisture sensitivity
  2. Thermal degradation
  3. Ion migration
  4. All of these
science hard Fill in the Blank Physics - Advanced Propulsion UPSC CSE, SSC Scientific Assistant, Railway JE

Ion thrusters used in spacecraft propulsion accelerate ions using ________ fields to generate thrust.

  1. Magnetic
  2. Electric
  3. Gravitational
  4. Electromagnetic
science hard Fill in the Blank Biology - Spatial Transcriptomics UPSC CSE, SSC Scientific Assistant, CSIR NET

Spatial transcriptomics combines gene expression profiling with ________ information to map RNA within tissue sections.

  1. Temporal
  2. Spatial
  3. Metabolic
  4. Proteomic
science hard MCQ Physics - Gravitational Lensing UPSC CSE, SSC Scientific Assistant, CSIR NET

Strong gravitational lensing by massive galaxy clusters can produce:

  1. Einstein rings
  2. Multiple images of background sources
  3. Magnification of faint objects
  4. All of these
science hard MCQ Biology - Microbiome-Brain Axis UPSC CSE, SSC Scientific Assistant, CSIR NET

The gut-brain axis involves communication via:

  1. Vagus nerve signaling
  2. Microbial metabolites (SCFAs)
  3. Immune system modulation
  4. All of these
science hard Fill in the Blank Chemistry - Hydrogen Storage Materials UPSC CSE, SSC Scientific Assistant, CSIR NET

Metal-organic frameworks (MOFs) store hydrogen via ________ adsorption at cryogenic temperatures.

  1. Chemical
  2. Physical
  3. Electrochemical
  4. Biological
science hard True/False Physics - Advanced Nuclear Reactors UPSC CSE, SSC Scientific Assistant, Engineering Services

True or False: Small Modular Reactors (SMRs) offer enhanced safety features and flexibility compared to conventional large reactors.

  1. True
  2. False
science hard Fill in the Blank Environmental Science - Climate Finance Instruments UPSC Prelims, SSC CGL, Banking PO

Green bonds are debt instruments issued to raise capital specifically for projects with ________ benefits.

  1. Social
  2. Environmental
  3. Economic
  4. Cultural
science hard MCQ Chemistry - CO₂ Utilization UPSC CSE, SSC Scientific Assistant, CSIR NET

Electrochemical reduction of CO₂ can produce valuable chemicals like:

  1. Formic acid
  2. Carbon monoxide
  3. Ethylene
  4. All of these
science hard Fill in the Blank Physics - Quantum Communication UPSC CSE, SSC Scientific Assistant, CSIR NET

Quantum teleportation transfers the quantum state of a particle using ________ and classical communication.

  1. Entanglement
  2. Superposition
  3. Interference
  4. Diffraction
science hard MCQ Environmental Science - Climate Tipping Points UPSC Prelims, SSC CGL, Railway NTPC

Which of the following is considered a potential climate tipping element?

  1. Amazon rainforest dieback
  2. West Antarctic Ice Sheet collapse
  3. Atlantic Meridional Overturning Circulation slowdown
  4. All of these
science hard Fill in the Blank Biology - Single-Cell Sequencing UPSC CSE, SSC Scientific Assistant, CSIR NET

Single-cell RNA sequencing (scRNA-seq) reveals ________ heterogeneity within tissues that bulk sequencing masks.

  1. Genetic
  2. Transcriptional
  3. Epigenetic
  4. Proteomic
science hard MCQ Physics - Topological Materials UPSC CSE, SSC Scientific Assistant, CSIR NET

Weyl semimetals host quasiparticles that behave like massless ________ fermions.

  1. Dirac
  2. Majorana
  3. Weyl
  4. Pauli
science hard Fill in the Blank Technology - Federated Learning UPSC CSE, Banking Specialist Officer, SSC CHSL

Federated learning trains AI models across decentralized devices while keeping data ________.

  1. Centralized
  2. Encrypted
  3. Local
  4. Anonymized
science hard MCQ Biology - Epigenetic Clocks UPSC CSE, SSC Scientific Assistant, CSIR NET

DNA methylation patterns at specific CpG sites can be used to estimate:

  1. Genetic ancestry
  2. Biological age
  3. Disease risk
  4. All of these
science hard Fill in the Blank Chemistry - Flow Battery Technology Railway JE, SSC JE, Banking Specialist Officer

Vanadium redox flow batteries store energy in liquid electrolytes containing ________ ions that undergo reversible redox reactions.

  1. Lithium
  2. Sodium
  3. Vanadium
  4. Zinc
science hard True/False Physics - Spintronics UPSC CSE, SSC Scientific Assistant, CSIR NET

True or False: Spintronics exploits the electron's spin degree of freedom, in addition to its charge, for information processing.

  1. True
  2. False
science hard MCQ Technology - Explainable AI UPSC CSE, Banking Specialist Officer, SSC CHSL

Explainable AI (XAI) techniques aim to make machine learning models:

  1. Faster
  2. More accurate
  3. Interpretable and transparent
  4. Smaller in size
science hard True/False Biology - Synthetic Genomics UPSC CSE, SSC Scientific Assistant, CSIR NET

True or False: The first synthetic bacterial cell (JCVI-syn1.0) was created by assembling a chemically synthesized genome and transplanting it into a recipient cell.

  1. True
  2. False
science hard MCQ Chemistry - Sustainable Catalysis UPSC CSE, SSC Scientific Assistant, CSIR NET

Enzyme immobilization on solid supports enhances catalyst reusability and stability for:

  1. Homogeneous catalysis
  2. Heterogeneous biocatalysis
  3. Photocatalysis
  4. Electrocatalysis