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UPSC Civil services Entrance exams General Studies test # General Science Motion in A Plane Prepare / Learn

Q1.

An arbitrary vector $\vec{A}$ in a plane can be expressed in terms of its x and y components by the equation

A. A⃗ =Axi^+Ayj

\vec{A} = A_{x} + A_{y}

\vec{A} = A_{x} \hat{i} - A_{y} \hat{j}

C. A⃗ =Axi^−Ayj

D. A⃗ =Ax−Ay

Answer : Option A
Explaination / Solution:

In a two-dimensional coordinate system, any vector can be broken into x -component and y -component.

Vector $\vec{A}$ can be represented as

$\vec{A} = A_{x} \hat{i} + A_{y} \hat{j}$

Where $A_{x}$ is component in direction of x-axis and $\hat{i}$ is a unit vector in same direction of x-axis

And $A_{y}$ is component in direction of y-axis and $\hat{j}$ is a unit vector in same direction of y-axis

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

Q2. The angular momentum L of the particle having a position vector r and linear momentum p, with respect to the origin O is defined to be

A. L⃗ =r⃗ ×p⃗

L = \vec{r} \times \vec{p} \times \vec{r}

\vec{L} = \vec{r} \times \vec{p} . \vec{ω}

C. L⃗ =r⃗ ×p⃗ .ω⃗

D. L⃗ =r⃗ ×r⃗ ×p⃗

Answer : Option A
Explaination / Solution:

Angular momentum is also referred as moment of linear momentum

The angular momentum L of a particle of mass m with respect to a chosen origin is given by

$\vec{L} = \vec{r} \times \vec{p}$

Direction of angular momentum is according to right hand rule.

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

Q3. Substances that alter the rate of a chemical reaction without being used up in a chemical reaction is known as

A. Poisons

B. Promoters

C. Inhibitors

D. Catalyst

Answer : Option D
Explaination / Solution:

Catalyst only increases or decreases the activation energy of a reaction. It doesnot get used up in reaction.

UPSC Civil services Entrance exams General Studies test # General Science Development Experience Of India a Comparison with Neighbors Prepare / Learn

Q4. Fertility rate is highest in

A. None

B. Pakistan

C. China

D. India

Answer : Option B
Explaination / Solution:

The number of children who would be born per woman (or per 1,000 women) if she/they were to pass through the childbearing years bearing children according to a current schedule of age-specific fertility rates.

UPSC Civil services Entrance exams General Studies test # General Science Electric Charges and Fields Prepare / Learn

Q5. Electric field at a point is defined as

A. electric force experienced by a dipole at that point

B. electric force per unit charge experienced by a unit charge at that point

C. electric force experienced by a charge at that point

D. electric force experienced by two charges at that point

Answer : Option B
Explaination / Solution:

Electric field intensity of a charge at a point is given by the force exerted by that charge on test charge or unit charge at that point
That is The electric field intensity of charge q is $E = \frac{F}{q_{0}}$

$I n v e c t o r f o r m \vec{E} = \frac{\vec{F}}{q_{0}}$

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

Q6. With reference to figure the yield strength point corresponds to

A. B

B. C

C. D

D. A

Answer : Option A
Explaination / Solution:

Yield point is point on the curve where the body deforms with negligible amount of stress. Hence it should be B

UPSC Civil services Entrance exams General Studies test # General Science Biotechnology Principles and Processes Prepare / Learn

Q7. The first restriction endonuclease discovered was

A. HindIII

B. PuvI

C. Hind II

D. EcoRI

Answer : Option C
Explaination / Solution:

The first restriction endonuclease discovered was Hind II. Hind II always cut DNA molecules at a particular point by recognizing a specific sequence of six base pairs. This specific base sequence is known as the recognition sequence of Hind II.

UPSC Civil services Entrance exams General Studies test # General Science Excretory Products and their Elimination Prepare / Learn

Q8.

In human excretory system :

i. kidneys and ureters are paired structures but urinary bladder is single.
ii. Kidneys are situated between the levels of last thoracic and third lumbar vertebra.

A. Statement ii) is wrong and i) is correct.

B. Statement i) is correct and ii) is wrong.

C. both are wrong

D. both are correct

Answer : Option D
Explaination / Solution:

The excretory system in human consistsof a pair of kidneys, one pair of ureters, aurinary bladder and a urethra. Kidneys are reddish brown, bean shaped structures situated between the levels of last thoracic and third lumbarvertebra close to the dorsal inner wall of the abdominal cavity.

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

Q9. In case of isobaric process the volume of an ideal gas change the work done by the gas is given by

A. P / ΔV

B. P + ΔV

C. P ΔV

D. P - ΔV

Answer : Option C
Explaination / Solution:

$\begin{aligned} d W = F . d y = P A . d y = P . d V \\ W = \int_{V_{1}}^{V_{2}} P . d V \end{aligned}$

$W = P (V_{2} - V_{1}) = P Δ V$

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

Q10. Which of the following bird will be called most successfully evolved?

A. Lays 5 eggs, 5 hatch and 5 reproduce

B. Lays 2 eggs, 2 hatch and 2 reproduce

C. Lays 10 eggs, 5 hatch and 4 reproduce

D. Lays 9 eggs, 9 hatch and 3 reproduce

Answer : Option A
Explaination / Solution:

An organism that lays 5 eggs, hatch the 5 eggs to reproduce 5 offspring can be considered as most evolved out of the other given condition. Least evolved organism lays more egg but produce only a few offspring.