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

Q1. Primary endosperm cell (PEC) is triploid (3n) structure as it is formed by

A. Fusion of two egg synergids and one male gamete

B. Fusion of one polar nuclei and two male gametes

C. Fusion of two polar nuclei and one male gamete

D. Fusion of two egg synergids and one polar nuclei

Answer : Option C
Explaination / Solution:

Primary endosperm cell is triploid because it is formed by fusion of two polar nuclei and one male gamete called triple fusion. Primary endosperm cells divides further to form endosperm that provide nourishment to embryo.

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

Q2. In a 30.0-s interval, 500 hailstones strike a glass window with an area of 0.600

m^{2}

at an angle of 45.0

^{\circ}

to the window surface. Each hailstone has a mass of 5.00 g and a speed of 8.00 m/s. If the collisions are elastic, what are the average force and pressure on the window?

A. 0.913 N

B. 0.943 N

C. 1.043 N

D. 0.978 N

Answer : Option B
Explaination / Solution:

$\begin{aligned} F = 500 \times \frac{Δ p}{Δ t} = 500 \times \frac{2 m v \cos 45^{\circ}}{Δ t} = \frac{500 \times 2 \times 5 \times 10^{- 3} \times 8 \times 1}{30 \times 1.41} \end{aligned}$

$F = 0.943 N$

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

Q3. One of the following options is not used for explaining atomic radius

A. van der waals’radius

B. covalent radius

C. metallic radius

D. coordinate radius

Answer : Option D
Explaination / Solution:

The distance from centre of the nucleus to the outermost shell containing the electrons is called atomic radius. There are four types that are widely used: covalent radii, metallic radii, van der Waal's radii and ionic radii.

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

Q4. Which of the following statements is not true about low density polythene?

A. Hard

B. Good conductor of electricity

C. Highly branched structure

D. Tough

Answer : Option B
Explaination / Solution:

Low density polymer are poor conductor of electricity.

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

Q5. The death rate if 8 individuals in a laboratory population of 40 fruit flies died during a particular week will be:

A. 0.4

B. 0.3

C. 0.2

D. 0.1

Answer : Option C
Explaination / Solution:

Death rate of a population = $\frac{N o . o f i n d i v i d u a l d i e d}{p r e v i o u s p o p u l a t i o n}$

Here death rate = $\frac{8}{40} = 0.2$

Hence, death rate of fruit fly died is equal to 0.2.

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

Q6. Main role of minor elements is to act as

A. Binder for cell structure

B. Constituent of amino acids

C. Constituent of hormones

D. Cofactor of enzyme

Answer : Option D
Explaination / Solution:

Micronutrients are required in very small quantity. The main role of micronutrients is to act as cofactor of enzyme. Co-factors increase the efficiency of enzymes.

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

Q7. Absorption of food takes place in stomach as well as intestine but villi are present in intestine only because :

A. stomach is already provided with microvilli

B. intestine receives better blood supply than other parts of alimentary canal

C. None of these

D. food is converted into absorbable form within intestine

Answer : Option D
Explaination / Solution:

Villi increases the surface area thereby increasing the absorption of food.The villi also contain lymph vessels for absorbing the products of fat-digestion. From the blood stream, the absorbed food is finally delivered to each and every cell of the body. The mucosal walls of the stomach form irregular folds known as rugae.These help in increasing the surface area to volume ratio of the expanding stomach.

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

Q8. Spherical aberration in a thin lens can be reduced by

A. using a doublet combination

B. using a circular annular mask over the lens

C. using a monochromatic light

D. increasing the size of the lens

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q9. Which one of the following is a matching pair of a drug and its category?

A. Lysergic acid dimethyl amide – narcotic

B. Heroin – psychotropic

C. Benzodiazepines – pain killer

D. Amphetamines – stimulant

Answer : Option D
Explaination / Solution:

Amphetamines is kind of drug which is used as stimulant. It is a strong CNS stimulant that is used in the treatment of ADHD. Lysergic acid dimethyl amide is not a narcotic and heroin is not a psychotropic agent.

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

Q10. A movement along a PPC implies

A. Redistribution of technology

B. Redistribution of wealth

C. Reallocation of resources

D. Reallocation of income

Answer : Option C
Explaination / Solution:

The movement along the PPC from left to right shows that in order to produce more units of capital goods, the economy must sacrifice some amount of consumer goods