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UPSC Civil services Entrance exams General Studies test # General Science Human Health and Disease Prepare / Learn

Q2. Antigen binding site in an antibody is found between

A. Two light chains

B. One heavy and one light chain

C. Two heavy chains

D. Either between two light chains or between one heavy and one light chain depending upon the nature of antigen

Answer : Option B
Explaination / Solution:

The antigen-binding (Fab) fragment is a region on an antibody that binds to antigens. It is composed of one constant and one variable domain of each of the heavy and the light chain.

UPSC Civil services Entrance exams General Studies test # General Science Structure of Atom Prepare / Learn

Q3. Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively:

A. 16 and 5

B. 16 and 4

C. 12 and 4

D. 12 and 5

Answer : Option D
Explaination / Solution:

Azimuthal quantum number l = 1 is for p and l = 2 is for d.

Now Cr has configuration $1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}, 3 d^{5}, 4 s^{1}$

Hence there are 12, p-electrons and 5, d-electrons

UPSC Civil services Entrance exams General Studies test # General Science Neural Control and Coordination Prepare / Learn

Q5. The band of nerve fibers that joins the two cerebral hemisphere in mammals is :

A. corpora quadrigemina

B. cruracerebri

C. corpora bigemina

D. corpus callosum

Answer : Option D
Explaination / Solution:

The corpus callosum (CC) is the largest of the commissural fibres, linking the cerebral cortex of the left and right cerebral hemisphere.

UPSC Civil services Entrance exams General Studies test # General Science Thermal Properties of Matter Prepare / Learn

Q6. expansion of water is called anomalous because

A. it expands on cooling from 10

^{\circ}

C to 4

^{\circ}

B. it contracts on heating from 0

^{\circ}

C to 4

^{\circ}

C. it expands on heating from 0

^{\circ}

C to 4

^{\circ}

D. it contracts on cooling from 4

^{\circ}

C to 0

^{\circ}

Answer : Option B
Explaination / Solution:

Liquids expand on heating and contract on cooling at moderate temperatures. But water exhibits an exceptional behaviour. When it is heated from 0 ºC, it actually contracts rather than expanding, up to 4 ºC. The volume of water is minimum at 4 ºC. Beyond 4 ºC, water starts expanding.This behaviour of water between 0 ºC and 4 ºC is called anomalous expansion of water..

UPSC Civil services Entrance exams General Studies test # General Science Producer Behaviour and Supply Prepare / Learn

Q7. Explicit costs are paid to

A. External owners of factors

B. Internal owners of factors

C. The government

D. The tax authorities

Answer : Option A
Explaination / Solution:
No Explaination.

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

Q8. Carbon monoxide is poisonous to human beings because :

A. Results in tears and redness

B. Acute respiratory disease

C. It binds to haemoglobin and eventually produces oxygen deficiency

D. They are carcinogenic

Answer : Option C
Explaination / Solution:

CO has more affinity to bind to Hb than oxygen. So it blocks the binding of oxygen to Hb causing deficiency of it and can lead to death.

UPSC Civil services Entrance exams General Studies test # General Science The d- and f- Block Elements Prepare / Learn

Q9. Zinc carbonate is precipitated from zinc sulphate solution by the addition of