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

Q1. A potentiometer has a uniform wire of length 10m and resistance 5 ohms. The potentiometer is connected to an external battery of emf of 10V and negligible internal resistance and a resistance of 995 ohms in series. The potential gradient along the wire is:

A. 1 mV/m

B. 1 mV/cm

C. 5 mV/cm

D. 5 mV/m

Answer : Option D
Explaination / Solution:

The total resistance is the sum of the resistance of the potentiometer and the external resistance.

R = Rpot + Rext = 5 + 995 = 1000 ohms .

The current through the potentiometer wire I = E/R = 10/1000 = 0.01A.

The potential drop across the potentiometer wire is

$\begin{array}{l} V = I \times R_{p o t} \\ \Rightarrow V = 0.01 \times 5 \\ V = 0.05 V \end{array}$

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

= 0.05/10

= 5 × 10^-3 V/m

= 5 m V/m

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

Q2. A pendulum suspended from a ceiling of a train has a period T when the train is at rest. When the train is accelerating with a uniform acceleration α, the period of oscillation will

A. Decrease

B. Remain unaffected

C. Become infinite

D. Increase

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q3. The three isotopes of hydrogen in terms of chemical properties show one of the following properties

A. difference is in their rates of reactions

B. same rates of reactions because of the same electronic configuration

C. same rates of reactions because of the same mass

D. same rates of reactions because of the same enthalpy of bond dissociation

Answer : Option A
Explaination / Solution:

There are three isotopes of hydrogen namely, protium 1H1, deuterium 1H2 or D and lastly tritium 1H3 or T.

Out of these three isotopes of hydrogen, only tritium is radioactive in nature which emits low energy b particles. As the electronic configuration of isotopes is same, they all have similar chemical properties. But they have a difference in their rates of reaction, this happens because of the different bond disassociation enthalpies.

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

Q4. The management of animal for milk and its product for human consumption is called

A. Dairying

B. Milk production

C. Animal keeping

D. Rearing of cow

Answer : Option A
Explaination / Solution:

Dairying or dairy management is the process and system that increase yield and increase the quality of milk. Milk yield is primarily dependent of quality of breeds in the farms.

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

Q5.

Assume that light of wavelength 6000

\overset{0}{A}

is coming from a star. What is the limit of resolution of a telescope whose objective has a diameter of 100 inch?

A. 2.6

\times 1 0^{- 7} r a d

B. 2.8

\times 1 0^{- 7} r a d

C. 2.9

\times 1 0^{- 7} r a d

D. 2.7

\times 1 0^{- 7} r a d

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q6. An iron bar magnet of length 10cm and cross section 1

c m^{2}

has a magnetization of

1 0^{2}

. Magnet's pole strength is

A. 0.001 Am

B. 0.0025 Am

C. 0.0015 Am

D. 0.002 Am

Answer : Option A
Explaination / Solution:
No Explaination.

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

Q7. Humans have increased extinction rate by a factor of

A. 10

B. 100

C. 10000

D. 1000

Answer : Option D
Explaination / Solution:

Various human activities like pollution, deforestation, urbanization, industrialization have increased the extinction rate of various organisms by a factor of 1000.

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

Q8. The tetrahedral complex, bis(benzoylacetonato)beryllium(II) will show

A. Ligand isomerism

B. Structural isomerism

C. Optical isomerism

D. Geometrical isomerism

Answer : Option C
Explaination / Solution:

This complex is non superimposable mirror image.

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

Q9. Read the following statements :

i. endocrine system corrects the imbalance originally detected by the nervous system.
ii. nerve cells and endocrine cells exist side by side in adrenal gland and pituitary.

A. both are correct

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

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

D. both are wrong

Answer : Option A
Explaination / Solution:

Endocrine system corrects the imbalance originally detected by the nervous system. Nerve cells and endocrine cells exist side by side in adrenal gland and pituitary gland.

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

Q10. For an isolated system, ΔU = 0, what will be ΔS?

A. ΔS = 0

B. ΔS < 0

C. ΔS will increase for some time and then reduce

D. ΔS > 0