HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Important Questions

State and prove: Law of conservation of angular momentum.

Derive the relation between surface tension and surface energy per unit area.

On what factors does the potential gradient of the wire depend?

Define Magnetization.

On what factors does the potential gradient of the wire depend?

Define Magnetization.

Describe, with the help of a circuit diagram, the working of Zener diode as a voltage regulator.

Write differences.

Tribal community and Rural Community

Explain sex determination in human beings.

Describe structure of root hair.

What is ‘biofortification’?

What are transgenic animals?

Construct an age pyramid which reflects an expanding growth status of human population.

Explain the term osmosis.

Explain the term osmosis.

Calculate the e.m.f. of the following cell at 298 K:

Fe(s) | Fe²⁺ (0.001 M) | | H⁺ (0.01 M) | H₂(g) (1 bar) | Pt(s)

Given that \[\ce{E^0_{cell}}\] = 0.44 V

[log 2 = 0.3010, log 3 = 0.4771, log 10 = 1]

Calculate emf of the following cell at 25°C:

\[\ce{Sn/Sn^2+ (0.001 M) || H+ (0.01 M) | H2_{(g)} (1 bar) | Pt_{(s)}}\]

Given: \[\ce{E^\circ(Sn^2+/sn) = -0.14 V, E^\circ H+/H2 = 0.00 V (log 10 = 1)}\]

Define the Standard enthalpy of combustion.

For a reaction A + B ⟶ P, the rate is given by

Rate = k [A] [B]²

How is the rate of reaction affected if the concentration of B is doubled?

For a reaction A + B ⟶ P, the rate is given by

Rate = k [A] [B]²

What is the overall order of reaction if A is present in large excess?