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

Q1. An echo repeats two syllables. If the velocity of sound is 330 m/s, then the distance of reflecting surface is

A. 16.5 m

B. 33.0 m

C. 66 m

D. 99 m

Answer : Option C
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science Botany-Principles of Inheritance and Variation Prepare / Learn

Q2. Inheritance of skin colour in humans is an example of

A. Co-dominance

B. Point Mutation

C. Polygenic inheritance

D. Chromosomal aberrations

Answer : Option C
Explaination / Solution:

Skin colour in human being is an example of polygenic inheritance. Eight different genes are involved in deciding the skin colour ranging between white to black.

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

Q3. Figure shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current is constant and equal to 0.15A. Capacitance and the rate of charge of potential difference between the plates are

A. 67.1

p F, 1.87 \times 1 0^{9} V s^{- 1}

B. 70.1

p F, 1.87 \times 1 0^{9} V s^{- 1}

C. 74.1

p F, 1.87 \times 1 0^{9} V s^{- 1}

D. 80.1

p F, 1.87 \times 1 0^{9} V s^{- 1}

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q4. Which of the following organisms not fix atmospheric nitrogen

A. Nostoc

B. Oscillatoria

C. Spirogyra

D. Anabaena

Answer : Option C
Explaination / Solution:

Spirogyra is a filamentous alga. This alga does not fix atmospheric nitrogen. Anabaena, Nostoc and Oscillatoria can heterocyst that can fix atmospheric nitrogen.

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

Q5. In the human heart :

i. The valve between right atrium and right ventricle is tricuspid while valve between left atrium and left ventricle is mitral valve.
ii. Openings of the right and the left ventricles into the pulmonary artery and the aorta are guarded by semilunar valves.
iii. ‘Lub’ the first sound which is low pitched is caused by the closure of semilunar valves while ‘Dub’ the second sound which is high pitched is caused by the closure of bicuspid and tricuspid valves.

A. only i) and ii) are correct

B. only ii) and iii) are correct

C. only ii) is correct

D. only iii) is correct

Answer : Option A
Explaination / Solution:

The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves.

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

Q6. The complex V is also known as

A. ADP

B. FoF1 -ATPase.

C. NAD

D. FAD

Answer : Option B
Explaination / Solution:

complex V or ATP synthase can be separated into 2 parts:

Fo - the portion embedded in the inner mitochondrial membrane and

F1-ATPase — the portion projecting into the matrix of the mitochondrion. This

is why the intact ATP synthase is also called the FoF1-ATPase.

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

Q7. Ionic crystalline compounds formed by ion-formation by electron transfer proves

A. Valence Shell Electron Pair Repulsion VSEPR Theory

B. Valence Bond (VB) Theory

C. Molecular Orbital (MO) Theory

D. electronic theory of chemical bonding

Answer : Option D
Explaination / Solution:

Ionic crystalline compounds formed by ion-formation by electron transfer proves electronic theory of chemical bonding.

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

Q8. A metallic rod of 1 m length is rotated with a frequency of 50 rev/s about an axis passing through the centre point O. Other end of the metallic rod slides on a Metallic ring . A constant and uniform magnetic field of 2 T parallel to the axis is present everywhere. What is the emf between the centre and the metallic ring?

A. 220 V

B. 314 V .

C. 240 V

D. 300 V

Answer : Option B
Explaination / Solution:

B = 2T

n = 50 rev/sec

$ω = 2 π n$

l = 1m

$e = \frac{1}{2} B ω l^{2} = \frac{1}{2} \times 2 \times 2 \times 3.14 \times 50 \times 1 \times 1 = 314 V$

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

Q9. Number of ejected photoelectrons increases with increase

A. in wavelength of light

B. in frequency of light

C. never

D. in intensity of light

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q10. Spraying of DDT produces pollution of

A. Air

B. Air and soil

C. Air, water and soil.

D. Air and water

Answer : Option C
Explaination / Solution:

Spraying of DDT produces pollution of air, water and soil. DDT is used as pesticides in agricultural field. It is non-biodegradable and reach to water bodies to pollute it. Some DDT also remains present in air as mist.