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UPSC Civil services Entrance exams General Studies test # General Science Locomotion and Movement Prepare / Learn

Q1. Select the correctly matched pair :

A. 11th& 12th pair of ribs → floating ribs

B. 9th & 10th pair of ribs → false ribs

C. First eight pair of ribs → true ribs

D. 9th & 10th pair of ribs → true ribs

Answer : Option A
Explaination / Solution:

Last 2 pairs i.e., 11th and 12th of ribs are not connected ventrally and are therefore, called floating ribs.

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

Q2. Technology strives

A. to fulfill a human need such as faster cooking or sewing etc

B. to invent better rat traps

C. to perfect science

D. to use science for application

Answer : Option A
Explaination / Solution:

Science and technology will continue to generate all sorts of new enhancers, and the quest for enhancement is not necessarily unfair or unethical. We humans are inveterate enhancers, striving to increase our intelligence and to improve our memory and powers of perception.

UPSC Civil services Entrance exams General Studies test # General Science Biotechnology and its Applications Prepare / Learn

Q3. Which of the following is not a use of transgenic animals?

A. Chemical safety testing

B. Study of normal physiology and development

C. Obtaining biological product

D. Study of viral disease

Answer : Option D
Explaination / Solution:

Transgenic animals are developed to study normal physiology and development, vaccine testing, chemical safety testing, obtaining biological product etc. These animals are not used to study viral disease.

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

Q4. Electrochemical processes for extraction of highly reactive metals and non-metals involves one of the following. Choose the most appropriate option.

A. reaction with inert gases

B. oxidation processes

C. reduction processes

D. redox processes

Answer : Option D
Explaination / Solution:

It involves redox process.

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

Q5.

Assertion: There is a statutory ban amniocentesis on sex determination in India.
Reason: Amniocentesis is used to determine sex of foetus for female foeticide.

A. Assertion is incorrect but reason is correct

B. Assertion is correct but reason is incorrect

C. Both assertion and reason are correct

D. Both assertion and reason are incorrect

Answer : Option C
Explaination / Solution:

The statutory ban on amniocentesis for sex determination is due to increasing female foeticide after knowing the sex of baby using the chromosomal pattern of amniotic fluid surrounding the foetus.

UPSC Civil services Entrance exams General Studies test # General Science Electrostatic Potential and Capacitance Prepare / Learn

Q7. The capacity of a pure capacitor is 1 farad. In DC circuit its effective resistance will be

A. zero

B. 1 Ω

C. 1/2r

D. infinite

Answer : Option D
Explaination / Solution:

Capacitor does not allow DC to pass through it. The effective capacitance or the capacitive reactance

X_{C} = \frac{1}{C ω}

, where ω is the frequency of voltage source. Since DC current is a constant current, its frequency is zero. The capacitive reactance is therefore infinity.

UPSC Civil services Entrance exams General Studies test # General Science Some Basic Concepts of Chemistry Prepare / Learn

Q8.

The gram molar mass of $C a C O_{3}$ is

A. 100 g

B. 100

C. 50 g

D. 150 u

Answer : Option A
Explaination / Solution:

The gram molar mass of Ca CO3 is calculated by ,

(i) adding up the atomic masses of Ca , C & 3 O atoms & ,

(ii) representing the molar mass in grams.

Thus , gram molar mass of Ca C O3

= $Σ$ [ atomic mass of Ca , atomic mass of C , 3 x atomic mass of O ]

= $[40 + 12 + (3 X 16)] g$

= ( 40 + 12 + 48 ) g

=100g

It should be noted that ,

atomic mass of Ca

= 12

atomic mass of C

= 12

atomic mass of O

= 16

UPSC Civil services Entrance exams General Studies test # General Science Consumers Equilibrium and Demand Prepare / Learn

Q9. The slope of price line throughout its length?

A. None of above

B. Is equal on the other side of the mid points

C. Differs from point to point

D. Remains the same

Answer : Option D
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science System of Particles and Rotational Motion Prepare / Learn

Q10. A dancer on ice spins faster when she folds her hands. This is due to

A. constant angular momentum and increase in kinetic energy

B. increase in energy and increase in angular momentum

C. decrease in friction at the skates

D. increase in energy and decrease in angular momentum

Answer : Option A
Explaination / Solution:

$L = I ω$

if L = const.

then $I ω = c o n s t .$

When a dancer is spinning, she has a certain angular momentum. When the dancer folds her arms, the distance of all the points of her body decreases with respect to axis of rotation so that her moment of inertia decreases. Thus, in order to conserve angular momentum, the speed of rotation has to increase and hence the dancer spins faster.

$\begin{aligned} K = \frac{L^{2}}{2 I} \\ K \propto \frac{1}{I} \end{aligned}$