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UPSC Civil services Entrance exams General Studies test # General Science Collection of Data Prepare / Learn

Q1. Sampling scheme where the units constituting the sample are selected at regular interval after selecting the very first unit at random with equal chance is called

A. Systematic random sampling

B. Purposive sampling

C. Stratified sampling

D. Cluster sampling

Answer : Option A
Explaination / Solution:

If a researcher wanted to create a systematic sample of 1,000 students at a university with an enrolled population of 10,000, he or she would choose every tenth person from a list of all students.

UPSC Civil services Entrance exams General Studies test # General Science Environment Sustainable Economic Development Prepare / Learn

Q2. According to Herman Daly steps required for achieving sustainable development are as follows except

A. Renewable resources should be extracted on a sustainable basis

B. Rate of depletion of non renewable resources should not exceed the rate of creation of renewable substitutes

C. Inefficient arising from pollution should be corrected

D. Technological progress should be input consuming.

Answer : Option D
Explaination / Solution:

To achieve sustainable decvelopment the following needs to be done :

Renewable resources should be extracted in sustainable manner.
Rate of extraction of non renewable resorces should not exceed the rate of creation of renewable substitutes.
Inefficiences arising from pollution should be corrected.
Technological progress should be input efficient.
Limiting the human population.

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

Q3. Central dogma of protein synthesis is

A. DNA→RNA→Protein

B. DNA→DNA→Protein

C. RNA→DNA→Protein

D. DNA→Protein→RNA

Answer : Option A
Explaination / Solution:

Central dogma of protein synthesis consists of transcription and translation. In transcription process, DNA is changed into mRNA and in translation step m-RNA produce specific protein.

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

Q4. The voltage across the terminals of an ac power supply varies with time according to Vcosωt. The voltage amplitude is V = 45.0 V. Average potential difference between the two terminals of the power supply is

A. 33.8 V

B. zero V

C. 35.8 V

D. 37.8 V

Answer : Option B
Explaination / Solution:

average value of ac voltage for a half cycle is positive and similiarly the mean value of ac voltage for other half cycle is negative.

Average potential difference between the two terminals for complete full cycle

$V_{a v} = (0.637 V_{0}) + (- 0.637 V_{0}) = 0$

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

Q5. 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 potential gradient in the potentiometer wire is:

A. 0.8 volt/m

B. 2.0 volt/m

C. 1.2 volt/m

D. 1.6 volt/m

Answer : Option D
Explaination / Solution:

If the battery has an e.m.f E, resitance of the potentiometer is R and the 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,

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

The potential gradient = ( potential drop across the potentiometer)/ length of the potentiometer wire)

= V/l

= 1.6/1

Potential gradient = 1.6 V/m

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

Q6. A mass M is suspended from a spring of negligible mass. The spring is pulled a little and then released so that the mass executes simple harmonic oscillations with a time period T.

A. 9/ 16

B. 5/ 4

C. 25/ 16

D. 41369.0

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q7. In Calgon’s method, one of the following chemical is used to remove hardness of water

A. sodium chloride

B. sodium carbonate

C. sodium hexametaphosphate

D. sodium hydroxide

Answer : Option C
Explaination / Solution:

Sodium hexametaphosphate is called calgon. Its molecular formula is (NaPO3)6 or Na6P6O18.

The addition of Calgon to hard water causes the calcium and magnesium ions of hard water to displace sodium ions from the anion of Calgon. This results in the removal of calcium and magnesium ions from hard water in the form of a complex with Calgon. The water is softened and sodium ions are released into water.

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

Q8. One of the alternate sources of proteins for animal and human nutrition is

A. Single cell protein

B. Single germ protein

C. Fortified protein

D. Hybrid protein

Answer : Option A
Explaination / Solution:

Protein requirement for human beings can be fulfilled by single cell protein in which algae like Spiruline is grown on large scale having high protein contents.

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

Q9. In a two-slit interference experiment in which the slits are 0.200 mm apart and the screen is 1.00 m from the slits. The m = 3 bright fringe is 9.49 mm from the central fringe. Wavelength of the light is

A. 633 nm

B. 653 nm

C. 663 nm

D. 683 nm