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

Q1. The voltage across the terminals of an ac power supply varies with time according to Vcosωt. The voltage amplitude is V = 45.0 V. Root-mean-square potential difference is

A. 37.8 V

B. 35.8 V

C. 33.8 V

D. 31.8 V

Answer : Option D
Explaination / Solution:

maximum voltage across the terminals V = 45 volt

Root-mean-square potential difference

$V_{r m s} = \frac{V}{\sqrt{2}} = \frac{45}{\sqrt{2}} = 31.8 v o l t$

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

Q2. The wire of the potentiometer has resistance 4 ohms and length 1 m. It is connected to a cell of e.m.f. 2 volts and internal resistance 1 ohm. The p.d. across the potentiometer wire is:

A. 1.2 V

B. 1.6 V

C. 0.8 V

D. 2.0 V

Answer : Option B
Explaination / Solution:

If the battery has an e.m.f E, the resitance of the potentiometer is R and internal resistance of the battery is r, then the current I flowing in the potentiometer wire is given as,

$\begin{array}{l} I = \frac{E}{(R + r)} \\ I = \frac{2}{(4 + 1)} \\ I = 0.4 A \end{array}$

The potential difference V across the potentiometer is

$\begin{array}{l} V = I \times R \\ \Rightarrow V = 0.4 \times 4 \\ V = 1.6 V \end{array}$

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

Q3. A rubber ball with water, having a small hole in its bottom is used as the bob of a simple pendulum. The time-period of such a pendulum:

A. Is a constant

B. First increases and then decreases finally having same value as at the beginning

C. Increases with time

D. Decreases with time

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q4. Temporary hardness It can be removed in boiling by precipitating

A. Ca(HCO3)2.Mg(OH)2

B. Mg(HCO3)2Ca(HCO3)2

C a C O_{3}

.Mg

(O H)^{2}

D. Mg(HCO3)2.CaCO3

Answer : Option C
Explaination / Solution:

C a C O_{3}

.Mg

(O H)^{2}

can be precipitate out in order to remove temporary hardness.

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

Q5. The maintenance of hives of honeybees for the production of honey is

A. Monoculture

B. Polyculture

C. Apiculture

D. Bee-culture

Answer : Option C
Explaination / Solution:

Maintenance of bee hives of honey bees for production of honey is called apiculture. Apiculture can be practiced in any area having pasture of herbs and flowering plants.

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

Q6. A light source emits visible light of two wavelengths: λ = 430 nm and λ' = 510 nm. The source is used in a double-slit interference experiment in which L = 1.5 m and d = 0.025 mm. separation distance between the third order bright fringes. is

A. 1.8 cm

B. 1.4 cm

C. 1.6 cm

D. 1.7 cm

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q7. which of the following features of atomic structure determine whether an element is diamagnetic or paramagnetic

A. atomic weight

B. principal quantum number

C. number of electrons

D. orbital angular momentum ,spin angular momentum

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q8. Diversity can be promoted by:

A. Fugitive species

B. Pioneer species

C. Dominant species

D. Recessive species

Answer : Option C
Explaination / Solution:

The species that predominates in an ecological community, particularly when they are most numerous or form the bulk of the biomass. Diversity can be promoted by dominant species. Dominant species of an ecosystem determine the way of diversity which may be linear or diverse.

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

Q9. Which of the following complex ions/molecules of nickel is paramagnetic?

{[N i {(N H_{3})}_{4}]}^{2 +}

B. None of these

[N i {(C O)}_{4}]

N i (d i m e t h y l g l y o x i m e)_{2}

Answer : Option A
Explaination / Solution:

N i^{2 +}

is in 3d8 configuration so its para magnetic .

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

Q10. A person accidentally got his adrenal gland injured. He died & reports will probably reveal that death was caused due to :

A. loss of adrenal medulla function

B. loss of adrenal cortex function

C. loss of both adrenal medulla function and adrenal cortex function

D. Insulin shock

Answer : Option B
Explaination / Solution:

Adrenal cortex is situated along the perimeter of the adrenal gland. The adrenal cortex mediates the stress response through production of aldosterone and cortisol. If a person got injured his adrenal gland may die due to loss of stress response which will be reveled in report.