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

Q1. Which of the following is not an example of redox reaction?

A. BaCl2+H2SO4→BaSO4+2HCl

B. 2K + F2 → 2KF

C. CuO +H2→ Cu +H2O

D. Fe2O3+3CO→2Fe+3CO2

Answer : Option A
Explaination / Solution:

The reaction is not redox because there is no oxidation or reduction of any element (i.e. no change in oxidation state/number).

Ba in BaCl2 is at a +2 charge because it is in group 2. On the other side of the equation Ba in BaSO4 is still +2. Cl2 on the first side of the equation is -2 (as 2 chlorines) and Cl is -2 on the other side as there are 2 of them.

H on both sides are both +1 (but technically +2 as there are two of them).

SO4 does not change oxidation number and always remains -2.

So, the reaction is not a redox reaction.

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

Q2. In a population, unrestricted reproductive capacity is called as

A. Biotic potential

B. Carrying capacity

C. Fertility

D. Birth rate

Answer : Option A
Explaination / Solution:

Unrestricted reproductive capacity of a population is called biotic potential. Having coitus with opposite partners may leads to pregnancy and cause a number of problems to individual as well as society.

UPSC Civil services Entrance exams General Studies test # General Science Electrostatic Potential and Capacitance Prepare / Learn

Q4. A parallel plate condenser is immersed in an oil of dielectric constant 2. The field between the plates is

A. increased proportional to 2

B. increased proportional to √2

C. decreased proportional to 1/2

D. decreased proportional to1/√2

Answer : Option C
Explaination / Solution:

In the presence of a dielectric with K=2, the electric field

E_{m}

=E/K= E/2, The force also reduces by 1/2

UPSC Civil services Entrance exams General Studies test # General Science Some Basic Concepts of Chemistry Prepare / Learn

Q5.

------ $B a_{3} N_{2}$ +----- $H_{2} O$ → ------ Ba $(O H)_{2}$ + ------ $N H_{3}$ .

The above equation can be balanced by inserting the following in blank spaces from LHS to RHS respectively.

A. 1,3,6,2

B. 1,6,3,6

C. 2,6,1,2

D. 1,6,3,2

Answer : Option D
Explaination / Solution:

The given equation gets stoichiometrically balanced when the coefficients ( 1 , 6 , 3 , 2 ) starting from LHS to RHS are inserted in given blank spaces .

Thus , the balanced equation for the reaction is ,

UPSC Civil services Entrance exams General Studies test # General Science Consumers Equilibrium and Demand Prepare / Learn

Q6. Total utility is maximum when?

A. Average utility is equal to zero

B. Average utility is maximum

C. Marginal utility is maximum

D. Marginal utility is zero.

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q7. The moment of inertia of a circular ring about an axis passing through its centre and normal to its plane is 200 gm

c m^{2}

. Then its moment of inertia about a diameter is

A. 300 gm

c m^{2}

B. 200 gm

c m^{2}

C. 400 gm

c m^{2}

D. 100 gm

c m^{2}

Answer : Option D
Explaination / Solution:

applying perpendicular axis theorm

$\begin{aligned} I_{z} = I_{x} + I_{y} \\ I_{z} = 200 \\ 200 = I + I \\ 2 I = 200 \\ I = 100 \end{aligned}$

I = moment of inertia about a axis passing through diameter

I = 100 gm cm2

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

Q8. Two soap bubbles are blown simultaneously .In the first soap bubble, the excess pressure is 4 times of second soap bubble. The ratio of radii of first to second soap bubble is

A. it is 2:1

B. it is 1:4

C. it is 1:2

D. it is 4:1

Answer : Option B
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science The p-Block Elements Prepare / Learn

Q9. Ozone reacts with KOH solution to form

K O_{3}

O_{2}

O_{3}

and

K O_{2}

O_{2}

and

K O_{2}

Answer : Option A
Explaination / Solution:

O_{3}

reacts with KOH to form

K O_{3}

UPSC Civil services Entrance exams General Studies test # General Science Structural Organisation in Animals Prepare / Learn

Q10. Nasal septum contains

A. Hyaline cartilage.

B. Calcified cartilage

C. Fibrous cartilage

D. Elastic cartilage

Answer : Option A
Explaination / Solution:

The nasal septum of human beings consist of hyaline cartilage which is highly elastic having collagen. It contains no nerves or blood vessels and is pearly bluish in colour.