Physics Chemistry & Biology Test 3
To detect nature of charge( Positive charge or negative charge) which of the following device is used ?
  • Electroscope ?
  • Rheostaut
  • Gold Leaf
  • All the above
Explanation:

A gold leaf electroscope is a specific type of electroscope that uses gold leaves to indicate the presence and nature of electric charge.

When a charged object is brought near, the leaves will either repel (if they have the same charge) or collapse (if they have opposite charges), allowing one to infer the type of charge.

Transformer works on the principle of ?
  • Internal Induction
  • Mutual Induction
  • Both a and b
  • None of the above
Explanation:

Transformers operate on the principle of mutual induction, which involves the transfer of electrical energy between two coils through a magnetic field.

In Volta cells, Anode(+), Cathode(-) and Electrolyte used are ?
  • Carbon, Zinc and Dil.NH4Cl
  • 2 carbon rods, Zinc and Dil.H2SO4
  • Copper, Zinc and Dil. H2SO4
  • None of the above
Explanation:

In a Voltaic cell (also known as a galvanic cell), zinc is typically used as the anode, copper as the cathode, and dilute sulfuric acid (H₂SO₄) serves as the electrolyte.

In Dry cells, Anode(+), Cathode(-) and Electrolyte used are ?
  • Carbon, Zinc and Dil.NH4Cl
  • 2 carbon rods, Zinc and Dil.H2SO4
  • Copper, Zinc and NH4Cl(paste)
  • Copper, Zinc and 2 electrolyte (Copper sulphate and Zinc sulphate)
Explanation:

In dry cells, zinc acts as the anode (-), carbon (typically in the form of a rod) acts as the cathode (+), and the electrolyte is a paste of ammonium chloride (NH₄Cl) along with some other materials.

King of chemicals ?
  • Sulphuric acid
  • Nitric Acid
  • Ammonia acid
  • None of the above
Explanation:

Sulphuric acid is often referred to as the "king of chemicals" due to its wide range of applications in various industries and its importance in chemical synthesis.

Melting point of Tungsten metal is ?
  • 100 degree Celsius
  • 1000 degree Celsius
  • 2400 degree Celsius
  • None of the above
Explanation:

Tungsten has a very high melting point of approximately 3422°C (6192°F), making it one of the highest among all metals. However, since the options do not provide this exact value, 2400 degree Celsius is the closest choice provided.

To emit Yellow colour light which of the following vapor is filled ?
  • Sodium Vapor
    • Explanation:

    Sodium vapor is used in sodium vapor lamps, which emit a characteristic bright yellow light.