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

Q1. Available organic matter for herbivores is represented by

A. Respiration

B. NPP

C. Secondary productivity

D. GPP

Answer : Option B
Explaination / Solution:

The organic matter available for herbivores is called net primary productivity (NPP). Total amount of organic matter fix during photosynthesis is called Gross primary productivity (GPP).

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

Q2. Referring to the Young’s double slit experiment, Path Difference corresponding to a Phase difference of π/3 is

A. λ /3

B. λ /4

C. λ /6

D. λ /5

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q3. Ammonia(

N H_{3}

A. electron-deficient compounds

B. electron-rich hydrides

C. electron acceptors

D. electron-precise compounds

Answer : Option B
Explaination / Solution:

Dihydrogen under certain reaction conditions combines with almost all elements except noble gases to form compounds called hydrides. Electron –rich hydrides, as the name suggest, are compounds of hydrogen with other elements that have excess electrons present as lone-pairs. For example ammonia –NH3 is a hydride of nitrogen that has one lone pair, water (H2O) is a hydride of oxygen that has two lone pairs etc. As these are electron rich species, they can donate electrons that is they are lewis bases.

UPSC Civil services Entrance exams General Studies test # General Science Strategies for Enhancement in Food Production Prepare / Learn

Q4. Crosses between two plants by the same variety are called

A. Interspecific

B. Intravarietal

C. Intervarietal

D. Intergeneric

Answer : Option B
Explaination / Solution:

The crosses between two plants of same varieties is called intravarietal cross. The hybrid obtained from intravarietal cross is more vigorous as they are heterogenic.

UPSC Civil services Entrance exams General Studies test # General Science Magnetism and Matter Prepare / Learn

Q5. Diamagnetic substances are

A. those which have tendency to move from weaker to the stronger part of the external magnetic field

B. those that are uneffected by external magnetic fields

C. those that develop a net magnetic moment in direction of applied field

D. those which have tendency to move from stronger to the weaker part of the external magnetic field

Answer : Option D
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science Biodiversity and Conservation Prepare / Learn

Q6. Match the following:

state
a) Tamil Nadu
b) Himachal Pradesh
c) Kerala & Tamil Nadu
d) Uttarakhand

biosphere reserve
i) Nandadevi
ii) Agasthyamalai
iii) cold desert
iv) gulf of Mannar

A. a)-ii, b)-iii, c)-ii, d)-iv

B. a)-iv, b)-i, c)-ii, d)-iii

C. a)-iv, b)-iii, c)-ii, d)-i

D. a)-ii, b)-i, c)-iv, d)-iii

Answer : Option C
Explaination / Solution:

In 1986, a group of 21 islets lying off the Tamil Nadu coast between Thoothukudi and Dhanushkodi was declared the Gulf of Mannar Marine National Park. The park and its 10 km buffer zone were declared a Biosphere Reserve in 1989.
Cold Desert Biosphere Reserve is a biosphere reserve located in the western Himalayas region, within Himachal Pradesh state in North India.
The Agasthyamalai Biosphere Reserve was Established in 2001 and includes 3,500.36 km² of which 1828 km² is in Kerala and 1672.36 km² is in Tamil Nadu.
The Nanda Devi National Park, established in 1982, is a national park situated around the peak of Nanda Devi in the state of Uttarakhand in northern India.

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

Q8. For earth satellites, the centripetal force is provided by

A. forces exerted by firing rockets on satellite

B. strong interactions

C. electrical forces

D. gravitational force

Answer : Option D
Explaination / Solution:

Gravity supplies the necessary centripetal force to hold a satellite in orbit about the earth. Setting the gravity force from the universal law of gravity equal to the required centripetal force yields the equation of motion of satellites in the circular orbit

i.e $F_{g r a v i t y} = F_{c e n t r i p e t a l}$

$\Rightarrow v_{o r b i t a l} = \sqrt{\frac{G M}{r}}$

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

Q9. Charge on one mole of electrons - Faraday is approximately

A. 99500 C

m o l^{-} 1

B. 96500 C

m o l^{-} 1

C. 97500 C

m o l^{-} 1

D. 98500 C

m o l^{-} 1

Answer : Option B
Explaination / Solution:

Charge on one electron is 1.6 x

10^{-} 19

C. 1 mole of electron 6.023x

10^{2} 3

electrons. So charge on one electron is 1.6 x

10^{-} 19

x 6.023 x

10^{2} 3

= 96500 C

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

Q10. Which one of the following group of animals is correctly matched with its characteristics without any exception?

A. Chondrichthyes possess cartilaginous endoskeleton

B. Chordates possess a mouth with an upper and lower jaw

C. Mammalia give birth to young ones

D. Reptila possess 3-chambered heart with incompletely divided ventricle

Answer : Option A
Explaination / Solution:

All cartilaginous fish or chondrichthyes possess cartilaginous endoskeleton. But some reptiles have four chambered heart. Chordates may be jawless and some mammals lay eggs also.