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

Q1. A pure inductor of 20.0 mH is connected to a source of 230 V. Inductive reactance and rms current in the circuit (if the frequency of the source is 50 Hz). are

A. 9.28 Ω, 36.6 A

B. 6.28 Ω, 46.6 A

C. 6.28 Ω, 36.6 A

D. 8.28 Ω, 36.6 A

Answer : Option C
Explaination / Solution:

$\begin{aligned} L = 20 m H = 20 \times 10^{- 3} H \\ V = 230 v o l t \\ f = 50 H z \end{aligned}$

inductive reactance

$X_{L} = ω L = 2 π f \times L = 2 \times 3.14 \times 50 \times 20 \times 10^{- 3} = 6.28 Ω$

rms current

$i = \frac{V}{X_{L}} = \frac{230}{6.28} = 36.6 A$

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

Q2. According to quantum theoretical model of an atom each orbital is designated by three quantum numbers labelled as n, l and ml. The values these can take are

n = 1,2,3..
l= 0,1,..n;
m = -l,-l+1, ..0,1..l-1, l

n = 1,2,3..
l= 0,1,..n
m= -l,-l+1, ..0,1

n = 1,2,3..
l= 0,1,..n-1;
m = 0,1..l-1, l

n = 1,2,3..
l= 0,1,..n-1;
mI = -I,-I+1,..0,1..I-1,I

Answer : Option D
Explaination / Solution:

n (Principal quantum number) value tell about the shell to which the electro belong, Ex,If n=1 electron belongs to first shell (K) around the nucleus

l (Azimuthal quantum number) tell about angular momentum, and shape of the orbitals, and it designates the subshells to which the electron belongs to. For a given value of 'n', ' l' can have value ranging from 0 to n-1. Ex, If n=2 then , the value of 'l' will be 0 and 1 (0 to n-1)

ml ( Magnetic orbital quantum number) determines the number of preferred orientations of the orbitals in the subshell, which are defined by given 'l' value. ex if 'l'= 2 then ml = 2l+1 =2*2 +1= 5 m value ie., m = +2,+1,0,-2,-1

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

Q4. In the following identify from up to down :
(i)&(ii)

(iii) & (iv)

A. effector,receptor,whitematter,grey matter

B. receptor,effector,greymatter,white matter

C. effector,receptor,greymatter,white matter

D. receptor,effector,whitematter,grey matter

Answer : Option B
Explaination / Solution:

The reflex pathway comprises at least one afferent neuron (receptor) and one efferent (effectoror excitor) neuron appropriately arranged in a series. The (iii) and (iv) shows gray and white matter.

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

Q5. The latent heat of fusion is.

(L_{f})

A. the heat per unit mass required changing a substance from solid into liquid, at high temperature and low pressure

B. the heat per unit mass required changing a substance from solid into liquid, at high pressure and low temperature

C. the heat per unit mass required changing a substance from solid into liquid, at the same temperature and pressure

D. the heat per unit mass required changing a substance from liquid into solid, at the same temperature and pressure

Answer : Option C
Explaination / Solution:

The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid at constant pressure.

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

Q6. Average Revenue(AR) is

A. Sum of Total Revenue and price

B. Total revenue per unit of inputs used

C. Total cost per unit produced

D. Total Revenue per unit of output

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q7. Which of the following pollutant gases naturally occurs in the environment :

N2O

NO2

SO3

D. SO2

Answer : Option D
Explaination / Solution:

SO2 is a naturally occurring pollutant gas with an approximate atmospheric concentration of 1 ppm. It is produced naturally by volcanic activities and burning of fossil fuels contaning sulphur.

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

Q8. Which of the following metals have only one oxidation state?

A. Sc

B. Al

C. Co

D. Fe

Answer : Option B
Explaination / Solution:

Al is not a d block element hence it shows only one oxidation state. While rest all others are d block elements which shows variable oxidation state.

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

Q9. Rank Correlation was found by

A. Galton

B. Spearman

C. Fisher

D. Pearson

Answer : Option B
Explaination / Solution:

In 1904, Charles Edward Spearman developed the formula to calculate coefficient of correlation of qualitative variables.

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

Q10. UWSP and USEP are the two components of which yojana

A. Valmiki Ambedkar Wass Yojana

B. Indira Awas Yojana

C. Swarn Jayanti Shahari Rozgar Yojana

D. Antodya Ann Yojana

Answer : Option C
Explaination / Solution:

Swarna Jayanti Shahari Rozgar Yojana (SJSRY) in India is a Centrally Sponsored Scheme which came into effect on 1 December 1997. The scheme strives to provide gainful employment to the urban unemployed and underemployed poor, through encouraging the setting up of self-employment ventures by the urban and rural poor living below the poverty line.