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UPSC Civil services Entrance exams General Studies test # General Science Mechanical Properties of Fluids Prepare / Learn

Q1. If a pipe carrying incompressible liquid has an area

A_{1}

and velocity

V_{1}

at one point

A_{2}

and

V_{2}

at another point, the equation of continuity gives the relation

A. A1V1=A2V2

B. A1V1=A2

C. A1V1=2A2V2

D. A1=A2V2

Answer : Option A
Explaination / Solution:

When a fluid is in motion, it must move in such a way that mass is conserved.Consider the steady flow of fluid through a duct (that is, the inlet and outlet flows do not vary with time). The inflow and outflow are one-dimensional, so that the velocity V and density $ρ$ are constant over the area A.

Now we apply the principle of mass conservation. Since there is no flow through the side walls of the duct, what mass comes in over $A_{1}$ goes out of $A_{2}$ , (the flow is steady so that there is no mass accumulation). Over a short time interval $Δ t$

As volume is same so this equation can be written as

$A_{1} V_{1} = A_{2} V_{2}$

This is a statement of the principle of mass conservation for a steady, one-dimensional flow, with one inlet and one outlet. This equation is called the continuity equation for steady one-dimensional flow.

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

Q2. The enthalpy change of a chemical reaction

Δ_{r} H

equals (

a_{i}

and

b_{i}

are stoichiometric coefficients)

A. ∑iaiHproducts-∑ibiHreactants

B. ∑iaiHproducts±∑ibiHreactants

C. ∑iaiHproducts+∑ibiHreactants

D. ∑iaiHproducts

Answer : Option A
Explaination / Solution:

UPSC Civil services Entrance exams General Studies test # General Science Structural Organisation in Animals Prepare / Learn

Q3. Identify the figure given below:

A. Ciliated epithelium

B. Goblet cells of alimentary canal

C. Salivary gland.

D. Compound epithelium

Answer : Option C
Explaination / Solution:

The figure is identified as salivary gland. It is multicellular and is lined with glandular epithelium cells. These types of cells are specialized in production and release of particular kind of digestive juices or sweat or oil. Salivary gland secretes alkaline fluid called saliva.

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

Q4. First phylogenetic system of classification was given by

A. Whittaker

B. John Ray

C. Engler and Prantl

D. Bantham and Hooker

Answer : Option C
Explaination / Solution:

First phylogenetic system of classification was given by Engler and Prantl which was based on evolutionary relationship of the organisms. Those evolved earlier are classified first and newly evolved later on.

UPSC Civil services Entrance exams General Studies test # General Science Economic Reforms Since 1991 Prepare / Learn

Q5. During the economic crisis, the World bank and IMF provided India a loan of

A. 7 billion

B. 5 billion

C. 8 billion

D. 6 billion

Answer : Option A
Explaination / Solution:

During the economic crisis, no country or financial lender was willing to lend to India. So, India approached the International Bank for Reconstruction and Development(IBRD), popularly known as the World Bank and the International Monetary Fund (IMF) and received $7 billion as loan to manage the crisis.

UPSC Civil services Entrance exams General Studies test # General Science Balance of Payments Prepare / Learn

Q6. The balance of payment is a more comprehensive than balance of trade concept. It is

A. Sometimes

B. Can’t say

C. Always

D. Never

Answer : Option C
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science Measures of Dispersion Prepare / Learn

Q7. The main disadvantage of the standard deviation is

A. It is used in many other statistical techniques

B. It takes into account all the values in the data set

C. It is a sensitive measure of dispersion

D. It is difficult to calculate by hand

Answer : Option D
Explaination / Solution:

It is very hard for a person to calculate square root and even square of deviations. Formula of standard deviation is very hard to remember.

UPSC Civil services Entrance exams General Studies test # General Science Chemical Coordination and Integration Prepare / Learn

Q8. Hormone which acts on hypothalamus to decrease food intake, stimulate satiety and increase energy output is :

A. Secretin

B. Growth hormone

C. Gastrin

D. Leptin

Answer : Option D
Explaination / Solution:

Leptin hormone acts on hypothalamus to decrease food intake, stimulate satiety and increase energy output. Leptin hormone is made by adipose cells.

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

Q9. According to IUPAC nomenclature,element Ununnillium have an atomic number of:

A. 110

B. 111

C. 109

D. 108

Answer : Option A
Explaination / Solution:

un=1 nil=0 So 110 = ununnilium.

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

Q10. In order to meet the growing demand for electricity India needs to add ________ of new capacity whereas at present India is able to add only ______ a year

A. 100000 MW, 20000 MW

B. 300000 MW, 30000 MW

C. 100000 MW, 40000 MW

D. 200000 MW, 20000 MW

Answer : Option A
Explaination / Solution:

In order to meet the growing demand for electricity, between 2000 and 2012, India needs to add 1,00,000 MW of new capacity, whereas, at present, India is able to add only 20,000 MW a year.

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