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Question Count: 573

Question:

In which layer of the atmosphere is the convection current seen?

[For External Candidates]

Physical Science Concerns About Our Environment WBBSE 1 2020

Answer:

Convection currents are seen in the troposphere.
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Question ID: 285

Uploaded on: September 22, 2024

Question:

Two resistances are to be connected in which combination so that the equivalent resistance becomes less than the individual resistances?

[For External Candidates]

Physical Science Current Electricity WBBSE 1 2020

Answer:

Two resistances should be connected in parallel.
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Question ID: 286

Uploaded on: September 22, 2024

Question:

A fixed mass of a gas occupies a volume of 150 cm3 at a fixed temperature and a pressure of 1 atmosphere. What volume will the gas occupy at that temperature and at a pressure of 1.5 atmospheres?

[For External Candidates]

Physical Science Behaviour of Gases WBBSE 1 2020

Answer:

P1​ = 1 atm V1​ = 150 cm3 P2​ = 1.5 atm V2 = P_1V_1\over P_2 V2 = 1 ×... </div> <div class="answer-full" style="display:none;"> <p>P<sub>1</sub>​ = 1 atm</p> <p>V<sub>1​ </sub>= 150 cm<sup>3</sup></p> <p>P<sub>2</sub>​ = 1.5 atm</p> <p data-pm-slice="0 0 []">V<sub>2</sub> = [katex]P_1V_1\over P_2

V2 = 1 × 150\over 1.5 = 100 cm3

The gas will occupy a volume of 100 cm3 at 1.5 atmospheres.

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Question ID: 287

Uploaded on: September 22, 2024

Question:

Which radioactive ray is composed of negatively charged particles?

[For External Candidates]

Physical Science Atomic Nucleus WBBSE 1 2020

Answer:

The radioactive ray composed of negatively charged particles is called beta rays (β-rays).
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Question ID: 288

Uploaded on: September 22, 2024

Question:

Mention one use of ethylene.

[For External Candidates]

Physical Science Organic Chemistry WBBSE 1 2020

Answer:

One use of ethylene is in the production of polyethene.
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Question ID: 289

Uploaded on: September 22, 2024

Question:

Write down the difference between a semiconductor and a superconductor on the basis of relationship between resistivity and temperature.

[For External Candidates]

Physical Science Current Electricity WBBSE 2 2020

Answer:

Semiconductor: Resistivity decreases with increasing temperature. Superconductor: Resistivity becomes zero below a critical temperature.
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Question ID: 290

Uploaded on: September 22, 2024

Question:

What is a diverging lens ?

[For External Candidates]

 

Physical Science Light WBBSE 2 2020

Answer:

A diverging lens, also known as a concave lens, is a type of lens that is thinner in the middle...
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Question ID: 291

Uploaded on: September 22, 2024

Question:

Write, with the balanced chemical equation, what happens when ammonium chloride is heated with dry slaked lime.

[For External Candidates]

Physical Science Current Electricity WBBSE 2 2020

Answer:

When ammonium chloride (NH4Cl) is heated with dry slaked lime, it undergoes a reaction that produces calcium chloride (CaCl2), water...
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Question ID: 292

Uploaded on: September 22, 2024

Question:

Write with an example what is meant by saturated hydrocarbon.

Physical Science Organic Chemistry WBBSE 2 2020

Answer:

A saturated hydrocarbon is a type of hydrocarbon in which all carbon-carbon bonds are single bonds. Example - ethane
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Question ID: 293

Uploaded on: September 22, 2024

Question:

Which layer of atmosphere has the greatest density?

  1. Troposphere
  2. Stratosphere
  3. Mesosphere
  4. Thermosphere

Physical Science Concerns About Our Environment WBBSE 1 2022

Answer:

a. Troposphere Explanation: The troposphere is the lowest layer of Earth's atmosphere and contains approximately 75% of the atmosphere's mass,...
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Question ID: 294

Uploaded on: September 23, 2024

Question:

The P - V graph of Boyle's Law related to gas is

Picture

Physical Science Behaviour of Gases WBBSE 1 2022

Answer:

(b) Explanation: The P-V graph (Pressure vs. Volume) related to Boyle's Law is a curve that shows an inverse relationship...
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Question ID: 295

Uploaded on: September 23, 2024

Question:

The relation between molecular mass (M) and vapour density (D) of gaseous substance is

  1. 2M=D
  2. M=D2
  3. M=2.8D
  4. M=2D

Physical Science Chemical Calculation WBBSE 1 2022

Answer:

d. M = 2D Explanation: Molecular mass is twice the vapour density of a substance.
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Question ID: 296

Uploaded on: September 23, 2024

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