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

Q1. The number of atoms per unit cell in a body centered cubic structure is

A. 4

B. 6

C. 2

D. 1

Answer : Option C
Explaination / Solution:

Atoms at corner contribute 1 to a unit cell and one atom is present in body center contribute 1. So total no. of atoms per unit cell is 2.

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

Q3. Electric potential at a distance r from a point charges q is

A. 14πϵ0qr3

B. 14πϵ0qr2

C. 14πϵ0q2r

D. 14πϵ0q
r

Answer : Option D
Explaination / Solution:

Electric potential at a point V is the work done in bringing unit positive charge from infinity to the point in an electric field.

V = \int_{\infty}^{r} - E ∙ d r = \int_{\infty}^{r} - \frac{q}{4 π ε_{0} r^{2}} d r = \frac{q}{4 π ε_{0} r}

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

Q4.

{[- C H - C H (C_{6} H_{5}) -]}_{n}

is a polymer obtained from?

A. styrene.

B. nylon 6, 6

C. terylene

D. nylon 6, 6

Answer : Option A
Explaination / Solution:

This is polymer obtained from monomer styrene

C H_{2} = C H (C_{6} H_{5})

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

Q5. Which compound is used as the cooling liquid in refrigerators?

A. Nitrous oxide

B. Phosphine

C. Ammonia

D. Ozone

Answer : Option C
Explaination / Solution:

N H_{3}

is used as cooling liquid in refrigerators

UPSC Civil services Entrance exams General Studies test # General Science Transport in Plants Prepare / Learn

Q6. Which one will reduce the rate of transpiration?

A. Increase in water uptake

B. Increase in wind velocity

C. Decrease in light intensity

D. Rise in temperature

Answer : Option C
Explaination / Solution:

Transpiration takes place through stomata. Decrease in light intensity closes the stomata that ultimately results into reduction in rate of transpiration.

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

Q7. In a hydraulic lift the force applied on the smaller cylinder of area A1 is F1. If the area of the larger cylinder is A2 the maximum weight that can be lifted is

A. F1A2

B. A1A2F1

C. F1

D. A2A1F1

Answer : Option D
Explaination / Solution:

According to Pascal's Law,

Pressure applied to any point inside the liquid is trnasmiteed equally in all direction so,

Pressure applied on the smaller cylinder is equal to the pressure on the other cylinder,which is given by

$\frac{F_{1}}{A_{1}} = \frac{F_{2}}{A_{2}}$

So,

Maximum force on the other side is ,

F2 = $\frac{A_{2}}{A_{1}} \times F_{1}$

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

Q8. The relationship between

C_{p}

and CV for an ideal gas is

A. Cp− CV= 2R

B. Cp+CV= R

C. CpCV= R

D. Cp− CV= R

Answer : Option D
Explaination / Solution:

For ideal gas Cp- CV = nR. For1 mole of gas n=1.

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

Q9. Intercalated discs occur in

A. At the junction of muscle and nerve cells

B. Between cardiac muscle fibres.

C. In striped muscles

D. Between neurons

Answer : Option B
Explaination / Solution:

In between cardiac muscle fibres, there are communication junctions which are made up of intercalated discs.

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

Q10. Which of the following organisms were placed together under algae?

A. Chlorella and Chlamydomonas

B. Spirogyra and Chlamydomonas

C. All of the above

D. Spirogyra and Chlorella

Answer : Option B
Explaination / Solution:

The character of possessing cell wall in their cells grouped together the unicellular organisms and the multicellular ones, for example, Chlamydomonas and Spirogyra were placed together under algae.