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UPSC Civil services Entrance exams General Studies test # General Science Environment Sustainable Economic Development Prepare / Learn

Q1. What happens when the rate of resources extraction exceeds that of their regeneration

A. Growth of resources

B. None

C. Both

D. Absence of life

Answer : Option D
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science Molecular Basis of Inheritance Prepare / Learn

Q2. Balbiani rings are the sites of

A. Synthesis of polysaccharides

B. Synthesis of lipids

C. RNA and Protein synthesis

D. DNA replication

Answer : Option C
Explaination / Solution:

A Balbiani ring is a large chromosome puff. Balbiani rings are diffused uncoiled regions of the polytene chromosome that are sites of RNA transcription and protein synthesis. They are formed in eukaryotic cells only.

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

Q3. The wiring for a refrigerator contains a starter capacitor. A voltage of amplitude 170 V and frequency 60.0 Hz applied across the capacitor is to produce a current amplitude of 0.850 A through the capacitor. Capacitance required is

A. 23.4 μF

B. 13.3 μF

C. 17.8 μF

D. 15.3 μF

Answer : Option B
Explaination / Solution:

$\begin{aligned} V = 170 v o l t \\ f = 60 H z \\ i = 0.85 A \\ V = i X_{C} = i \frac{1}{ω C} = \frac{i}{2 π f C} \end{aligned}$

Capacitance required

$C = \frac{i}{2 π f V} = \frac{0.85}{2 \times 3.14 \times 60 \times 170} = 13.3 \times 10^{- 6} F = 13.3 μ F$

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

Q4. A potentiometer wire, 10 m long, has resistance 40 ohms. It is put in series with a resistance 760 ohms and connected to a 2 volt battery. The potential gradient in the wire is :

A. 1×10−2volt/m

B. 1×10−6volt/m

C. 1×10−3volt/m

D. 1×10−4volt/m

Answer : Option A
Explaination / Solution:

The total resistance is the sum of the resistance of the potentiometer and the external resistance. $R = R_{p o t} + R_{e x t} = 40 + 760 = 800 Ω$

Current through the potentiometer is

$\begin{array}{l} I = \frac{E}{R} = \frac{2}{800} \\ I = 2.5 \times 10^{- 3} A \end{array}$

The potential drop across the potentiometer

$\begin{array}{l} V = I \times R_{p o t} \\ V = (2.5 \times 10^{- 3}) \times 40 \\ \Rightarrow V = 0.1 V \end{array}$

The potential gradient = ( potential drop across the potentiometer)/ length of the potentiometer wire)

$\begin{array}{l} = \frac{0.1}{10} V / m \\ ∴ P o t e n t i a l g r a d i e n t = 1 \times 10^{- 2} V / m \end{array}$

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

Q5. If the length of a simple pendulum is increases by 1percent, then the new time-period

A. Increases by 2.0 percent

B. Increases by 1 percent

C. Increases by 0.5 percent

D. Decreases by 0.5 percent

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q6. Consider the reactions (A)

H_{2} O_{2} + 2HI \to I_{2} + 2 H_{2} O (B) HOCl + H_{2} O_{2} \to H_{3} O + Cl - - + O_{2}

A. a reducing agent in (A) and oxidising agent in (B)

B. an oxidising agent in (A) and reducing agent in (B)

C. a reducing agent in both (A) and (B)

D. an oxidising agent in both (A) and (B)

Answer : Option B
Explaination / Solution:

H_{2} O_{2}

is an oxidizing agent in 1st reaction and Reducing agent in 2nd reaction.

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

Q7. Which one is not a common fresh water fish

A. Common carp

B. Catla

C. Hilsa

D. Rohu

Answer : Option C
Explaination / Solution:

Hilsa is not a common fresh water fish. It is a marine fish. Common fresh water fish are Catla, Rohu and Common carp.

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

Q8. For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500 nm?

A. 16 m

B. 17 m

C. 18 m

D. 15 m

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q9. A cylinder of iron is placed so that it is free to rotate around its axis. Initially the cylinder is at rest, and a magnetic field is applied to the cylinder so that it is magnetized in a direction parallel to its axis. If the direction of the external field is suddenly reversed, the direction of magnetization will also reverse and the cylinder will begin rotating around its axis because

A. Conservation of mass

B. Conservation of energy

C. Conservation of parity

D. Conservation of angular momentum and spin angular momentum is of the same nature as the angular momentum of rotating bodies

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q10. Nowadays,the greatest cause for extinction or biodiversity loss is

A. invasive or alien species

B. climate change

C. habitat alteration

D. overharvesting

Answer : Option C
Explaination / Solution:

The greatest cause for extinction or biodiversity loss is the habit alteration. Deforestation causes loss of habits of a number of wild animals. Pollution of water also alter the habitat of aquatic organisms.