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UPSC Civil services Entrance exams General Studies test # General Science Thermal Properties of Matter Prepare / Learn

Q1.

A child running a temperature of 101 $^{\circ}$ F is given an antipyrin (i.e. a medicine that lowers fever) which causes an increase in the rate of evaporation of sweat from his body. If the fever is brought down to 98 $^{\circ}$ F in 20 min, what is the average rate of extra evaporation caused, by the drug? Assume the evaporation mechanism to be the only way by which heat is lost. The mass of the child is 30 kg. The specific heat of human body is approximately the same as that of water, and latent heat of evaporation of water at that temperature is about 580 cal $g^{- 1}$

g^{- 1}

A. 5.2 g/min

B. 4.6 g/min

C. 4.3 g/min

D. 4.9 g/min

Answer : Option C
Explaination / Solution:

$Δ T = 101 - 98 = 3^{\circ} F = {(3 \times \frac{5}{9})}^{\circ} C$

Specific heat of the human body = Specific heat of water = 1000 cal/kg/ °C

The heat lost by the child is $Q = m c Δ T = 30 \times 1000 \times (3 \times \frac{5}{9}) = 50000 c a l$

Let m1 be the mass of the water evaporated from the child’s body in 20 min.
Loss of heat through water is

$\begin{aligned} Q = m_{1} L \\ m_{1} = \frac{Q}{L} = \frac{50000}{580} = 86.2 g m \end{aligned}$

Average rate of extra evaporation caused by the drug = m1 / t
= 86.2 / 200
= 4.3 g/min.

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

Q2. The nature of correlation for shoe size and IQ is _________

A. No correlation

B. Linear

C. None

D. Non-linear

Answer : Option A
Explaination / Solution:

There is no relationship between the shoe size of a person and his IQ and therefore there is no correlation

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

Q3. The ratio measures the number of poor below poverty line is known as

A. Poverty count real ratio

B. Population count ratio

C. Head count ratio

D. None

Answer : Option C
Explaination / Solution:

When the number of poor is estimated as the proportion of people below the poverty line, it is known as 'head count ratio'.

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

Q4. Which plant has fungal association in the form of mycorrhiza?

A. Sequoia

B. Cedrus

C. Pinus

D. Cycas

Answer : Option C
Explaination / Solution:

Roots in some genera of gymnosperms have fungal association in the form of mycorrhiza(Pinus).

UPSC Civil services Entrance exams General Studies test # General Science Cell The Unit of Life Prepare / Learn

Q5. The ribosomes of a polysome translate

A. Proteins to DNA

B. DNA to DNA

C. mRNA toProteins

D. mRNA toDNA

Answer : Option C
Explaination / Solution:

Several ribosomes may attach to a single mRNA and form a chain called polyribosomes or polysome. The ribosomes of a polysome translate the mRNA into proteins.

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

Q6. Which type of data is contained in the census of India?

A. Agriculture

B. Population

C. National Income

D. Industry

Answer : Option B
Explaination / Solution:

According to the Census Act 1948, population of India is counted using Census alongwith various charecterstics of the population.

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

Q7. Which is least soluble in water?

A g 2 S

Answer : Option C
Explaination / Solution:

A g 2 S

is least soluble in water.

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

Q8. Two major environmental issues facing the world today are

A. Global warming and Ozone depletion

B. None of these

C. Growth and sustainable development

D. Poverty and Inequality

Answer : Option A
Explaination / Solution:
No Explaination.

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

Q9. What is called Griffith effect?

A. DNA transcription

B. Bacterial transduction

C. Bacterial transformation

D. RNA translation

Answer : Option C
Explaination / Solution:

Griffith's experiment, was an experiment done in 1928 by Frederick Griffith. It was one of the first experiments showing that bacteria can get DNA through a process called transformation. Griffith carried out experiment on mice using pneumonia causing bacteria to show that DNA is the genetic material by transforming non-virulent strain into virulent strain which is called bacterial transformation.

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

Q10. Inductance of an inductor whose reactance is 120 Ω at 80.0 Hz is

A. 0.239 H

B. 0.219 H

C. 0.209 H

D. 0.199 H

Answer : Option A
Explaination / Solution:

XL=120Ωf=80HzXL=ωL=2πfLL=XL2πf=1202×3.14×80=0.239H

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