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

Q1. The reaction of cyanamide, N

H_{2}

CN (s), with dioxygen was carried out in a bomb calorimeter, and

Δ U

was found to be 742.7 kJ

mo l^{_1}

at 298 K. Calculate enthalpy change for the reaction at 298 K. N

H_{2}

CN(g) +

\frac{3}{2}

O_{2} (g) \to N_{2} (g) + C O_{2} (g) + H_{2} O (l)

A. -767.8 kJ

B. -741.5 kJ

C. -702.2 kJ

D. 741.5 kJ

Answer : Option B
Explaination / Solution:

Δ H^{0} = Δ U^{0} + Δ n_{g}

RT where Δng = 2-((3/2)+1)

UPSC Civil services Entrance exams General Studies test # General Science Balance of Payments Prepare / Learn

Q2. Foreign exchange means

A. Any currency

B. US Dollars

C. Any currency other than the domestic currency

D. Domestic currency

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q4. Compact fluorescent lamp (CFL) consumes ______ percent less power than ordinary bulb

A. 70

B. 50

C. 60

D. 80

Answer : Option D
Explaination / Solution:

According to the Bureau of Energy Efficiency (BEE), CFLs consume 80 percent less power as compared to ordinary bulbs.

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

Q5. Which of the following lattices has the highest packing efficiency?

A. Simple cubic

B. Hexagonal close packed

C. Body centered cubic

D. Primitive cubic

Answer : Option B
Explaination / Solution:

Packing Efficiency is highest 74%.

UPSC Civil services Entrance exams General Studies test # General Science Classification of Elements and Periodicity in Properties Prepare / Learn

Q6. The correct order for the decrease in atomic radii is

A. Be< B< C< Li

B. C< Li< Be< B

C. Li< Be< B< C

D. Li< Be< B< C

Answer : Option D
Explaination / Solution:

In a period moving from left to right, the effective nuclear charge increases because the next electron fills in the same shell. So the atomic size decreases.

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

Q7. Which of the following polymers can have strong intermolecular forces?

A. Nylon Polystyrene

B. Both Nylon Polystyrene and Rubber

C. Polyesters

D. Rubber

Answer : Option B
Explaination / Solution:

Rubber and polystyrene have strong intermolecular forces.

UPSC Civil services Entrance exams General Studies test # General Science Botany-Sexual Reproduction in Flowering Plants Prepare / Learn

Q8. The coconut water from tender coconut is nothing but

A. Embryo sac

B. Free nuclear endosperm

C. Nucellus

D. Cellular endosperm

Answer : Option B
Explaination / Solution:

The coconut water from tender coconut is nothing but free nuclear endosperm made up of thousands of nuclei. The surrounding white kernel is the cellular endosperm.

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

Q9.

Air at 20.0 $^{\circ} C$ in the cylinder of a diesel engine is compressed from an initial pressure of 1.00 atm and volume of 800.0 $c m^{3}$ to a volume of 60.0 $c m^{3}$ . Assume that air behaves as an ideal gas with $γ = 1.4$ and that the compression is adiabatic. Find the final pressure of the air

A. 37.6 atm

B. 39.6 atm

C. 38.6 atm

D. 36.6 atm

Answer : Option A
Explaination / Solution:

P1V1γ=P2V2γP2=P1(V1V2)γ=1×(80060)1.4=37.6atm

UPSC Civil services Entrance exams General Studies test # General Science Organisms and Populations Prepare / Learn

Q10. Which statement explains amensalism?

A. One species is harmed while other is not affected

B. Both species are harmed

C. One species is benefitted while other is not affected

D. Both species are benefitted

Answer : Option A
Explaination / Solution:

One type of relationship that has been classified by biologists and ecologists is amensalism. Amensalism is any relationship between organisms of different species in which one organism is inhibited or destroyed while the other organism remains unaffected.