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

Q1. Success of an organism in nature can be determined by

A. evaluating species importance in that ecosystem

B. analysing its interactions with environment

C. calculating carrying capacity

D. measuring population size and biomass

Answer : Option D
Explaination / Solution:

Success of an organism in nature can be determined by measuring population size and biomass of the organism. An organism having large number of species is more successful than those with lesser numbers.

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

Q2. Main function of Nickel (Ni2+) in leaves and root is

A. Cytochrome oxidase

B. Metabolism of urea and ureides

C. Amylase and anion-cation balance

D. Activates enzymes

Answer : Option B
Explaination / Solution:

Main function of Nickel ions in leaves and root is metabolism of urea and ureides to form amino acids and protein in plant body.

UPSC Civil services Entrance exams General Studies test # General Science Digestion and Absorption Prepare / Learn

Q3. Correct sequence of layers in gut wall from inside to outside is :

A. Muscularis →Mucosa → Submucosa → Serosa

B. Mucosa → Submucosa → Muscularis → Serosa

C. Mucosa → Muscularis → Submucosa → Serosa

D. Submucosa →Mucosa → Muscularis → Serosa

Answer : Option B
Explaination / Solution:

The wall of alimentary canal is made of four layers performing different functions. The inner most layer is called mucosa followed by submucosa,muscularis and serosa. Theses layers are made of different kind of tissues to perform different function.

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

Q4. Copolymerisation of 1, 3 – butadiene and acrylonitrile needs

A. peroxide catalyst

B. antimony trioxide catalyst

C. zinc acetate catalyst

D. persulphate catalyst

Answer : Option A
Explaination / Solution:

Copolymerisation of 1,3-butadiene and acrylonitrile requirw peroxide catalyst.

UPSC Civil services Entrance exams General Studies test # General Science Botany-Reproduction in Organisms Prepare / Learn

Q5. Asexual reproduction is common in

A. Protists and Plantae

B. Monera and Animalia

C. Plantae and Animalia

D. Protists and Monerans

Answer : Option D
Explaination / Solution:

Asexual reproduction is common in Protists and Monera. Both these kinds include organisms having single celled body. Binary and multiple fissions are generally followed for asexual mode of reproduction.

UPSC Civil services Entrance exams General Studies test # General Science Ray Optics and Optical Instruments Prepare / Learn

Q6. A person with defective eyesight is unable to see objects clearly nearer than 1.5 m. He wants to read a book placed at a distance of 30 cm from his eyes. Find the power of the lens he requires for his spectacles

A. + 2.5 D

B. + 2.67 D

C. -2.67 D

D. -2.5 D

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q7. The incubation period of Hepatitis 'B' virus is

A. 42-56 days

B. One week

C. 30-180 days

D. 15-20 days

Answer : Option C
Explaination / Solution:

Incubation period is the time elapsed between exposure to a pathogenic organism, a chemical, or radiation, and when symptoms and signs are first apparent. The incubation period of the hepatitis B virus is 75 days on average, but can vary from 30 to 180 days. The virus may be detected within 30 to 60 days after infection and can persist and develop into chronic hepatitis B.

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

Q8. The increasing order of bond dissociation energies of following species is -----?

A. Cl2< O2< N2< F2

B. N2< O2< F2< Cl2

C. F2< Cl2< O2< N22

D. F2< N2< Cl2< O2

Answer : Option C
Explaination / Solution:

As bond order increases bond dissociation energy also increases .

Thus $N_{2}$

(i) the triple bonded $N_{2}$ with bond order

= 3

has the highest bond dissociation energy .

(ii) The doubly bonded $O_{2}$ with bond order

= 2

has lesser bond dissociation energy than $N_{2}$

(iii) $F_{2}$ and $C l_{2}$ both are single bonded having the same bond order

= 1

but , the electron - electron repulsive force ( e - e repulsion ) is maximum in a $F_{2}$ molecule due to its small size. This accounts for the lower bond dissociation energy of $F_{2}$ as compared to $C l_{2}$

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

Q9. The basic economic problem arises in

A. Socialist economies

B. All Economies

C. Mixed Economies

D. Market Economies

Answer : Option B
Explaination / Solution:

Economic problem arises mainly due to two reasons- (i) human wants are unlimited (ii) means to satisfy human wants are scarce. The problem of scarcity is faced by an individual and the society. With wants unlimited and resources scarce, our wants cannot be fulfilled.

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

Q10. Mohan lacks one or more type of cone cells in the retina of his eye. So he will suffer from :

A. night blindness

B. colour blindness

C. squint

D. cataract

Answer : Option B
Explaination / Solution:

Colour perception of human eye is due to presence of cones in their retina. If one of more kinds of cones are missing from retina of eye, the person suffer from genetic disease called colour blindness.