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

Q1. According to superposition principle in relation to displacements produced by a number of waves

A. resultant displacement is the scalar sum of the displacements produced

B. resultant displacement is the arithmetic sum of the displacements produced

C. resultant displacement is the dot product of the displacements produced

D. resultant displacement is the vector sum of the displacements produced

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q2. Dihydrogen reacts with dioxygen to form water. The reaction is.

A. occurs at room temperature

B. slightly endothermic

C. highly endothermic

D. highly exothermic

Answer : Option D
Explaination / Solution:

The formation of water from it's elements produces, in addition to water, a tremendous amount of energy, 572 kJ to be exact.

2H2 + O2 $\to$ 2H2O + ENERGY

This is an example of an exothermic reaction, a reaction that produces energy. It is also an example of what is called a combustion reaction, where a substance (in this case hydrogen gas) is combined with oxygen

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

Q3. The best way to obtain bacteria and viruses free plants through tissue culture is

A. Seed germination under aseptic conditions

B. Seed germination after gamma irradiation

C. Shoot apex or meristem culture

D. Micro propagation

Answer : Option C
Explaination / Solution:

Many important plants contain systemic viruses which substantially reduce their potential yield and quality. It is, therefore, important to produce virus free stocks which can be multiplied. Generally, highly meristematic tissue of a virus infected plant remains free from virus due to their fast mitotic activity. Therefore, shoot tips and meristems of a virus infected plant are the ideal explants to produce a virus free stock.

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

Q4. The IUPAC name

[C o C l (N O_{2}) {(e n)}_{2}] C l

A. Chloridobis(ethylenediamine)nitrito – N – cobalt(III) chloride

B. Chloridonitrobis(ethylenediamine)cobalt(III)chloride

C. Bis(ethylenediamine)chloronitrocobalt(III)chloride

D. Chloridonitrobis(ethylenediamine)cobalt(II)chloride

Answer : Option A
Explaination / Solution:

Name of ligands name first in alphabetical order followed by anme of central ion.

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

Q5. According to Gauss’s law for magnetism

A. The magnetic flux through any surface is zero.

B. The magnetic flux through any closed surface is zero.

C. The net magnetic flux through any closed surface is zero.

D. The net magnetic flux through any surface is zero.

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q6. If we say, India has about 50,000 type of rice and 1000 types of varieties of mango what level of diversity it indicates:

A. community diversity

B. genetic diversity

C. ecosystem diversity

D. species diversity

Answer : Option B
Explaination / Solution:

India has about 50,000 type of rice and 1000 types of varieties of mango. This high level of diversity indicates very high genetic diversity and one of the largest in the world.

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

Q7. Molar conductivity denoted by the symbol Λm is related to the conductivity of the solution by the equation (κis the conductivity and c the concentration)

Answer : Option C
Explaination / Solution:

Molar conductivity is specific conductivity of a solution having 1 mole of electrolyte dissolved per litre of solution.

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

Q8. The force of attraction between a hollow spherical shell of uniform density and a point mass situated outside is just as if the entire mass of the shell is

A. equally concentrated at three points on a triangle of the shell.

B. concentrated at the centre of the shell.

C. equally concentrated at opposite ends of the diameter of the sphere

D. equally concentrated at four points on a square of the shell.

Answer : Option B
Explaination / Solution:

According to Shell's theorem, If a particle of mass m is located outside a spherical shell of mass M at, for instance, point P, the shell attracts the particle as though the mass of the shell were concentrated at its centre. Thus, as far as the gravitational force acting on a particle outside the shell is concerned, a spherical shell acts no differently from the solid spherical distributions of mass.

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

Q9. In n-type semiconductor the total number of conduction electrons

n_{e}

is due to the,

A. electrons generated intrinsically only

B. holes generated intrinsically only

C. holes contributed by donors and those generated intrinsically

D. electrons contributed by donors and those generated intrinsically

Answer : Option D
Explaination / Solution:

When pentavalent impurity is added to an intrinsic or pure semiconductor (silicon or germanium), then it is said to be an n-type semiconductor. Pentavalent impurities such as phosphorus, arsenic, antimony etc are called donor impurity. In n-type semiconductor, the population of free electrons is more whereas the population of holes is less. Hence in n-type semiconductor free electrons are called majority carriers and holes are called minority carriers. Therefore, in a n-type semiconductor conduction is mainly because of motion of free electrons.

UPSC Civil services Entrance exams General Studies test # General Science Forms of Market and Price Determination Prepare / Learn

Q10. The elasticity at a point on a straight line supply curve passing through the origin making an angle of 45°will be

A. 4

B. 2

C. 1.0

D. 3