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UPSC Civil services Entrance exams General Studies test # General Science Molecular Basis of Inheritance Prepare / Learn

Q1. In the synthesis of which of the following, the DNA molecule is not directly involved?

A. protein molecule

B. mRNA molecule

C. t-RNA molecule

D. another DNA molecule

Answer : Option A
Explaination / Solution:

DNA molecules are not directly involved in synthesis of protein. In protein synthesis, DNA, first undergoes transcription process and produce m-RNA. Translation process takes place and produce protein.

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

Q2. The current amplitude in a pure inductor in a radio receiver is to be 250 μA when the voltage amplitude is 3.60 V at a frequency of 1.60 MHz (at the upper end of the AM broadcast band). Inductance needed is

A. 1.13mH

B. 1.43mH

C. 1.23mH

D. 1.33mH

Answer : Option B
Explaination / Solution:

$\begin{aligned} i = 250 μ A = 250 \times 10^{- 6} A \\ V = 3.60 v o l t \end{aligned}$

f = 1.6 MHz = 1.6 x 106 Hz

If only inductor is present in the circuit, then

$V = i X_{L}$

inductive reactance $X_{L} = \frac{V}{i} = \frac{3.60}{250 \times 10^{- 6}} = 14400 Ω$

$X_{L} = ω L = 2 π f L$

inductance

$L = \frac{X_{L}}{2 π f} = \frac{14400}{2 \times 3.14 \times 1.6 \times 10^{6}} = 1.433 \times 10^{- 3} = 1.43 m H$

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

Q3. Electromotive force is

A. The work done per unit charge by the source in taking the charge from lower to higher potential energy

B. The work done by the source in taking the charge from lower to higher potential energy

C. The number of charges pumped by the source from lower to higher potential energy

D. The work done per unit charge by the source in taking the charge from higher to lower potential energy

Answer : Option A
Explaination / Solution:

An electric field exists in the electrolyte between the positive and negative terminals of the battery. In the external circuit, the current flows from the positive electrode to the negative electrode. To maintain continuity, in the electrolyte, the current (positive charges) flow from the negative electrode (lower potential) to the positive electrode (higher potential). Work done by the source in taking unit positive charge from lower to higher potential is called electromotive force.

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

Q4. A spring has a certain mass suspended from it and its period for vertical oscillations is

T_{1}

. The spring is now cut into two equal halves and the same mass is suspended from one of the halves. The period of vertical oscillations is now

T_{2}

.The ratio of

T_{1}

T_{2}

A. 2

\sqrt{2}

\frac{1}{2}

\sqrt{2}

\sqrt{2}

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q5. In the process of obtaining pure de-mineralised water is passed initially through cation exchange, This makes the water

A. remain unchanged

B. basic

C. acidic

D. neutral

Answer : Option C
Explaination / Solution:

Cation exchange resin have exchangeable hydrogen ions which makes the water acidic.

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

Q6. The class of domesticated fowl or bird used for food or their egg is called

A. Apiculture

B. Animal husbandry

C. Poultry

D. Domestication

Answer : Option C
Explaination / Solution:

Poultry is the class of domesticated fowl or bird used for their meat or their egg. They include chicken, duck and sometimes turkey and geese.

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

Q7. The angle of incidence at which the reflected beam is fully polarized is called

A. Acute angle

B. critical angle

C. Brewster angle

D. Malus angle

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q8. Nitric oxide is a paramagnetic compound. The magnetic moment of each NO molecule has a maximum component in any direction of about one Bohr magneton.Interaction energy of such magnetic moments in a 1.5-T magnetic field is

A. 8.7×10−5eV

B. 9.0×10−5eV

C. 8.9×10−5eV

D. 8.4×10−5eV

Answer : Option A
Explaination / Solution:
No Explaination.

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

Q9. Match the following:

state
a) Andhra Pradesh
b) Gujarat
c) Sikkim
d) Karnataka

sanctuary
i) Barsey rhododendron sanctuary
ii) Dandeli wildlife sanctuary
iii) Manjira wildlife sanctuary
iv) Sansagir wildlife sanctuary

A. a)-i, b)-iii, c)-ii, d)-iv

B. a)-iv, b)-ii, c)-i, d)-iii

C. a)-ii, b)-iv, c)-iii, d)-i

D. a)-iii, b)-iv, c)-i, d)-ii

Answer : Option D
Explaination / Solution:

Manjira wildlife sanctuary Located across the Manjira River, this wildlife sanctuary is situated in the Medak district in Andhra Pradesh (Now in Telangana).
Also known as Sasan-Gir, or Gir forest, this is a forest and wildlife sanctuary in Gujarat, established in 1965.
The Varsey Rhododendron Sanctuary or Barsey Rhododendron Sanctuary occupies 104 km² in the Singalila Range in western Sikkim. It borders on Nepal to the west, and on the state of West Bengal to the south across the Rambong Khola stream.
Dandeli Wildlife Sanctuary is the second largest sanctuary in Karnataka.