Tools MCQ Quiz in मल्याळम - Objective Question with Answer for Tools - സൗജന്യ PDF ഡൗൺലോഡ് ചെയ്യുക

The correct answer is 'Radio telescope'

Key Points

• Radio telescope:
  • Radio telescopes detect radio waves emitted by various celestial objects.
  • They can detect invisible gases and reveal regions of space obscured by cosmic dust, which optical telescopes cannot see.
  • They are crucial in studying phenomena like quasars, pulsars, and the cosmic microwave background radiation.

Additional Information

• Optical telescope:
  • Designed to observe visible light from celestial objects.
  • Limited by atmospheric interference and cannot penetrate cosmic dust effectively.
• Ultra telescope:
  • No such specific category as "Ultra telescope" in astronomical studies.
  • May refer to advanced telescopes, but not a standard term in the field.
• Normal telescope:
  • A general term that could refer to any basic telescope, typically optical.
  • Not specialized for detecting invisible gases or observing through cosmic dust.

The correct answer is Table.

Key Points

• Hard Materials:
  • Hard materials are those that resist deformation and are difficult to compress or cut.
  • They are often used in construction, furniture, and tools due to their durability and strength.
  • Examples include metals, ceramics, and certain types of wood.
• Table:
  • A table is typically made from hard materials such as wood, metal, or plastic.
  • It is designed to support weight and resist wear and tear, making it a suitable example of a hard material.

Additional Information

• Cotton:
  • Cotton is a soft, fibrous material commonly used in textiles and clothing.
  • It is not hard and can be easily compressed and cut.
• Paper:
  • Paper is a thin, flexible material used for writing, printing, and packaging.
  • While it has some structural integrity, it is not considered hard.
• Sponge:
  • A sponge is a soft, porous material used for cleaning and cushioning.
  • It is highly compressible and far from being hard.

The correct answer is - Tin, Lithium, Sodium

Key Points

• Tin, Lithium, Sodium
  • This group consists solely of elements, each of which is a pure substance composed of only one type of atom.
  • Tin (Sn), Lithium (Li), and Sodium (Na) are all classified as chemical elements on the Periodic Table.
  • These elements are not alloys or mixtures, but pure substances with distinct atomic structures and properties.
  • In contrast, the other options contain alloys (e.g., bronze, steel, brass), which are mixtures of two or more elements, typically metals.
• Other Options:
  • Option 1: Bronze and Aluminium are alloys or mixtures, not individual elements.
  • Option 2: Steel is an alloy, and Zinc is an element, making this group inconsistent.
  • Option 4: Sodium is an element, but Brass is an alloy, making this group invalid.

Additional Information

• Elements
  • Elements are pure substances that cannot be broken down into simpler substances by chemical means.
  • Each element is represented by a unique chemical symbol on the Periodic Table.
  • Examples include Oxygen (O), Hydrogen (H), and Iron (Fe).
• Alloys
  • Alloys are mixtures of two or more elements, where at least one is a metal.
  • They are created to enhance properties such as strength, durability, and resistance to corrosion.
  • Examples of alloys include:
    • Bronze (Copper + Tin)
    • Steel (Iron + Carbon)
    • Brass (Copper + Zinc)
• Periodic Table
  • All elements are organized in the Periodic Table based on their atomic number and chemical properties.
  • Metals, non-metals, and metalloids are grouped into distinct regions of the table.
  • Elements like Lithium and Sodium are classified as alkali metals, while Tin is a post-transition metal.

Concept:

• Farm machinery has improved the agricultural industry to the best of its ability.
• Various machinery is being used in crop cultivation at various stages of the crop cycle.
• The cutting of a crop after it is mature is called harvesting.

Explanation:

Thresher

• ​A thresher is a farm machine used to separate small grains and seed harvests from their chaff and straw.
• It is used in farming after harvesting crops.
• It can also be used these days to separate seeds from the cob.

Thus, a thresher machine is used to separate seeds from the cob.