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UPSC Civil services Entrance exams General Studies test # General Science Thermodynamics Prepare / Learn

Q1. The lattice enthalpy of an ionic compound is the

A. enthalpy change which occurs when one mole of an ionic compound dissociates into its ions in gaseous state

B. enthalpy change which occurs when one gm of an ionic compound dissociates into its ions in gaseous state

C. enthalpy change which occurs when one mole of an ionic compound dissociates into its ions in liquid state

D. enthalpy change which occurs when one kg of an ionic compound dissociates into its ions in liquid state

Answer : Option A
Explaination / Solution:

The lattice enthalpy of an ionic compound is the enthalpy change which occurs when one mole of an ionic compound dissociates into its ions in gaseous state.

UPSC Civil services Entrance exams General Studies test # General Science Structural Organisation in Animals Prepare / Learn

Q2. Two animal cells are interconnected by

A. Plasma membrane

B. Desmosomes

C. Cell wall

D. Plamodesmata

Answer : Option B
Explaination / Solution:

Two animal cells are interconnected by desmosomes, through which exchange of materials takes place between two cells. It is formed from protein plaques in the cell membranes linked by filaments.

UPSC Civil services Entrance exams General Studies test # General Science Biological Classification Prepare / Learn

Q3. The asexual reproduction in fungi takes place by

A. Ascospores

B. OOspores

C. Basidiospores

D. Zoospores

Answer : Option D
Explaination / Solution:

Asexual reproduction in fungi is by spores called conidia or sporangiospores or zoospores, and sexual reproduction is by oospores, ascospores and basidiospores.

UPSC Civil services Entrance exams General Studies test # General Science Economic Reforms Since 1991 Prepare / Learn

Q4. IBRD stands for

A. International Bank for Reconstruction and Development

B. International Business for Reconstruction and Development

C. International Business for Resolution and Development

D. International Bank for Reconstruction and Disinvestment

Answer : Option A
Explaination / Solution:

IBRD stands for International Bank for Reconstruction and Development, and is popularly known as the World Bank. It was established in 1944 with the mission of financing the reconstruction of European Nations devastated by the World War II.

UPSC Civil services Entrance exams General Studies test # General Science Balance of Payments Prepare / Learn

Q5. To buy domestic or foreign goods, the more relevant is

A. Only B

B. None

C. Nominal exchange rate

D. Real exchange rate

Answer : Option D
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science Measures of Dispersion Prepare / Learn

Q6. What would happen to the variance of a data set if we added 5 to every observation?

A. Variance increased by 5

B. Variance decrease by 10

C. Variance decrease by 5

D. No Change

Answer : Option D
Explaination / Solution:

variance is unaffected due to change of origin.

UPSC Civil services Entrance exams General Studies test # General Science Classification of Elements and Periodicity in Properties Prepare / Learn

Q7. d-Block Elements are characterized by the

A. absence of d orbital electrons

B. filling of inner d orbitals by electrons

C. filling of outer d orbitals

D. inner d orbitals are not filled

Answer : Option B
Explaination / Solution:

d-Block elements also known as transition elements are characterized by the filling of inner d orbitals by electrons before the valence-shell s orbital.

UPSC Civil services Entrance exams General Studies test # General Science Economics Infrastructure Prepare / Learn

Q8. It is propensity to fall ill .It affects your work by making you temporarily disabled

A. morbid

B. Mordity

C. None

D. Morbidity

Answer : Option D
Explaination / Solution:

In adequate infrastructure can have multiple adverse effects on health. Improvements in water supply and sanitation have a large impact by reducing morbidity.

UPSC Civil services Entrance exams General Studies test # General Science Kinetic Theory Prepare / Learn

Q9. Estimate the fraction of molecular volume to the actual volume occupied by oxygen gas at STP. Take the diameter of an oxygen molecule to be 3A^o

\overset{0}{A}

A. 5

\times

1 0^{- 4}

B. 3.5

\times

1 0^{- 4}

C. 3.8

\times

1 0^{- 4}

D. 4.5

\times

1 0^{- 4}

Answer : Option C
Explaination / Solution:

Radius = $1.5 A^{\circ}$

molecular volume of oxygen

$V = N_{A} \times \frac{4}{3} π r^{3} = 6.023 \times 10^{23} \times \frac{4}{3} \times 3.14 \times {(1.5 \times 10^{- 10})}^{3} = 8.51 c m^{3}$

Actual volume of oxygen at STP = 22400cm3

ratio of molercular volume to the actual volume = $\frac{8.51}{22400} = 3.8 \times 10^{- 4}$

UPSC Civil services Entrance exams General Studies test # General Science Organisms and Populations Prepare / Learn

Q10. Orchid shows commensalism as interaction with

A. both mango tree and bee

B. Banana tree

C. bee

D. mango tree

Answer : Option D
Explaination / Solution:

Commensalism is interaction in which one species is benefited by other is neither benefited nor harmed. Orchids growing on mango tree do not harm the mango plants but get shelter.