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UPSC Civil services Entrance exams General Studies test # General Science Body Fluids and Circulation Prepare / Learn

Q1. The mass of tissue seen in the left corner of the right atrium close to the atri-ventricular septum is

A. Purkinje fibres

B. SAN

C. Bundle of His

D. AVN

Answer : Option D
Explaination / Solution:

Atrioventricular Node or AV node is compact half oval mass of myogenic fibres which lies in the posterior septal wall of right atrium near the opening of coronary sinus. It receives impulse from SA node and transmits it to ventricles.

UPSC Civil services Entrance exams General Studies test # General Science Microbes in Human Welfare Prepare / Learn

Q2. Which of the following is a gram-negative bacterium?

A. Amycolatopsis orientali

B. Streptomyces coelicolor

C. Escherichia coli

D. Bacillus subtilis

Answer : Option C
Explaination / Solution:

The bacterium that do not retain the Gram stain are called gram negative bacteria. Escherichia coli ( commonly abbreviated E. coli) is a Gram-negative gammaproteobacterium commonly found in the lower intestine of warm-blooded organisms

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

Q3. Electron transport system take place in

A. Cristae

B. Inner mitochondrial membrane

C. Mitochondrial space

D. Matrix

Answer : Option B
Explaination / Solution:

The metabolic pathway through which the electron passes from one carrier to another, is called the ETS and it is present in the inner mitochondrial membrane.

UPSC Civil services Entrance exams General Studies test # General Science Chemical Bonding and Molecular Structure Prepare / Learn

Q4. The shift in electron density is symbolised by crossed arrow in the below diagram. It depicts

A. Lewis structure

B. dipole moment

C. resonance hybrid

D. resonance

Answer : Option B
Explaination / Solution:

The cross base arrow demonstrates the net dipole. On the cross-base arrow, the cross represents the positive charge and the arrow represents the negative charge.

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

Q5.

Figure shows planar loops of different shapes moving out of or into a region of a magnetic field which is directed normal to the plane of the loop away from the reader. Direction of induced current in i,ii and iii are

A. anti-clockwise, anti-clockwise, clockwise

B. clockwise, clockwise, clockwise

C. anti-clockwise, clockwise, anti-clockwise

D. anti-clockwise, clockwise, clockwise .

Answer : Option D
Explaination / Solution:

(i) Due to motion, the magnetic flux linked with the loop abcd increases. According to lenz's law this increase in flux is opposed by the induced current. Therefore, the induced current must flow anticlockwise

(ii) Due to motion, the magnetic flux linked with the loop abc decreases. So that induced current is clockwise.

(iii) Due to motion, the magnetic flux linked with the loop decreases. So that induced current is clockwise

UPSC Civil services Entrance exams General Studies test # General Science Dual Nature of Radiation and Matter Prepare / Learn

Q6. The energy of a photon corresponding to the visible light of maximum wavelength is approximately

A. 7 eV

B. 1.6 eV

C. 1 eV

D. 3.2 eV

Answer : Option B
Explaination / Solution:

maximum wavelength of visible light = 7700 A0

Energy

$\begin{aligned} E = \frac{h c}{λ} = \frac{6.6 \times 10^{- 34} \times 3 \times 10^{8}}{7700 \times 10^{- 10}} = 2.57 \times 10^{- 19} J \\ E = \frac{2.56 \times 10^{- 19}}{1.6 \times 10^{- 19}} = 1.6 e V \end{aligned}$

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

Q7. Escape speed from the earth is the

A. minimum speed at which to throw an object such that it does not fall back to the earth

B. none of these

C. minimum speed at which to throw an object such that it falls back to the earth

D. maximum speed at which to throw an object such that it does not fall back to the earth

Answer : Option A
Explaination / Solution:

The escape velocity is the minimum velocity required to leave a planet or moon. For a rocket or other object to leave a planet, it must overcome the pull of gravity.

$V_{e s c a p e} = \sqrt{\frac{2 G M}{R}}$

Vescape=11184 m/sec approximate to 11.2 km/sec

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

Q8. Using the same land for farming, forestry as well as animal husbandry will be called

A. agroforestry

B. reserve forestry

C. composite forestry

D. rural forestry

Answer : Option A
Explaination / Solution:

Agroforestry is the using of same land for farming, forestry as well as animal husbandry in integrated manner. The byproduct of one process in used in another process.

UPSC Civil services Entrance exams General Studies test # General Science Haloalkanes and Haloarenes Prepare / Learn

Q9. Hydrocarbons are prepared from Grignard reagent by

A. None of the above

B. by exposing them to Magnesium

C. by reacting them to water

D. by exposing them to diethyl ether