Goa Board (GBSHSE) - Class 9

History, Democratic Politics & Geography question bank (Social Science (Class 9))

Practice 523 free Goa Board (GBSHSE) - Class 9 Social Science (Class 9) - History, Democratic Politics & Geography questions with answers and step-by-step solutions.

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Q1.

Optics (Lens & Mirror Formulas): In 'The French Revolution, Socialism in Europe and Russian Revolution', what is the spherical lens formula relating $f, u, v$?

(A)

$\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$ (The French Revolution, Socialism in Europe and Russian Revolution)

(B)

$\frac{{1}}{{f}} = \frac{{1}}{{v}} + \frac{{1}}{{u}}$

(C)

$f = u + v$

(D)

None of these

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Q2.

Heredity & Genetics: According to Mendel's law in 'The French Revolution, Socialism in Europe and Russian Revolution', the monohybrid phenotypic ratio in the $F_2$ generation is:

(A)

$3 : 1$ (Dominant : Recessive) (The French Revolution, Socialism in Europe and Russian Revolution)

(B)

$9 : 3 : 3 : 1$

(C)

$1 : 1$

(D)

None of these

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