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

Q1. The complete combustion of glucose produces

A. Pyurvic acid

B. Ethanol

C. carbon dioxide and oxygen

D. Lactic acid

Answer : Option C
Explaination / Solution:

The complete combustion of glucose, which produces carbon dioxide and water as end products, yields energy most of which is given out as heat.

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

Q2. One of the following is highly radioactive

A. Francium

B. Lithium

C. Rubidium

D. Caesium

Answer : Option A
Explaination / Solution:

Fr is highly radioactive metal, that decays in to astatine,,radium and radon , it is also highly unstable element found only in trace amount on earth.

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

Q3. Which of the followings is also called sac fungi that live parasitically and in various habitats?

A. Ascomycetes

B. Zygomycetes

C. Basidiomycetes

D. Phycomycetes

Answer : Option A
Explaination / Solution:

Ascomycetes is called as sac fungi that live parasitically and in various habitats. They are responsible for a number of fungal disease in plants.

UPSC Civil services Entrance exams General Studies test # General Science Organic Chemistry Some Basic Principles and Techniques Prepare / Learn

Q4. In general, in the molecules containing multiple bonds,_____ provide the most reactive centres. Choose the most appropriate one.

A. Π bonds

B. σ bond

C. hyperconjugation

D. p orbitals

Answer : Option A
Explaination / Solution:

pie bonds are the most reactive centers.

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

Q5. According to Farady's law for a coil having N turns, the total induced emf is given by

A. e=μ0NdϕBdt

B. e=μ0N2dϕBdt

C. e=−dϕBdte=−NdϕBdt

D. e=−dϕBdt

Answer : Option C
Explaination / Solution:

The induced electromotive force in any closed circuit is equal to the negative of the time rate of change of the magnetic flux enclosed by the circuit.

induced emf for a coil having 1 turns will be $e = - \frac{d ϕ_{B}}{d t}$

The flux of all the turns will be added up. So the induced emf for a coil having N turns will be $e = - N \frac{d ϕ_{B}}{d t}$

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

Q6. Stopping potential in the experimental set up shown in figure is

A. negative potential

V_{0}

given to the plate A for which the photocurrent stops or becomes zero

B. positive potential

V_{0}

given to the plate A for which the photocurrent stops increasing

C. positive potential

V_{0}

given to the plate A for which the photocurrent saturates

D. positive potential

V_{0}

given to the plate A for which the photocurrent stops or becomes zero

Answer : Option A
Explaination / Solution:

The negative potential of the plate at which the photo electric current becomes zero is called stopping potential or cut-off potential. Its value is negative because some electron reach to the plate with their kinetic energy at zero potential.

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

Q7. Smog which doesn’t contain any secondary pollutants is

A. Modern smog

B. Native smog

C. Photochemical smog

D. Classical smog

Answer : Option D
Explaination / Solution:

Classical smog does not contain any secondary pollutants. It is a mixture of fog, sulfur dioxide and coal smoke particulates. Photochemical smog is formed by chemical reactions of sunlight, nitrogen oxide and voltalic organic compounds in the atmosphere to form secondary pollutants.

UPSC Civil services Entrance exams General Studies test # General Science Some Basic Concepts of Chemistry Prepare / Learn

Q8. SI units for Base Physical Quantities of length, mass and current are

A. decimetre, kilogram, ampere

B. meter, gram, ampere

C. meter, kilogram, candela

D. meter, kilogram, ampere

Answer : Option D
Explaination / Solution:

The International System of units ( abbreviated as SI ) is modern form of metric system , and is most widely used form of measurements . It comprises of a coherent system of measurement built of seven base units . The base units for length , mass and current in this system of measurements are , " meter , kilogram , ampere " ,symbolised respectively as as m ,kg , A

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

Q9. AgCN reacts with haloalkanes to form isocyanide. Haloalkanes react with KCN to form alkyl cyanides as main product

A. KCN is mainly covalent in nature

B. KCN provides cyanide ions in solution.

C. AgCN provides cyanide ions in solution.

D. AgCN is mainly ionic in nature

Answer : Option B
Explaination / Solution:

AgCN is covalent in nature while KCN is ionic so KCN produces CN- in the solution. CN- is an ambient nucleophile i.e. it can form bond from both C and N atoms. KCN is an ionic compound so both C and N sides are available for the formation of bond, but C-C bond is stronger than C-N bond so cynide is formed. AgCN is a covalent compound so only N side is available for CN to form bond and thus isocynide is formed

UPSC Civil services Entrance exams General Studies test # General Science System of Particles and Rotational Motion Prepare / Learn

Q10. considering binary (double) stars in our frame of reference, the trajectories of the stars are a combination of

A. (i) uniform motion in a circle of the centre of mass and (ii) circular orbits of the stars about the centre of mass

B. (i) uniform motion in a straight line of the centre of mass and (ii) circular orbits of the stars about the centre of mass

C. i) uniform motion in a straight line of the centre of mass and (ii) elliptical orbits of the stars about the centre of mass

D. i) uniform motion in a straight line of the centre of mass and (ii) straight line motion of the stars about the centre of mass

Answer : Option B
Explaination / Solution:

A double star or visual double is a pair of stars that appear close to each other in the sky as seen from Earth when viewed through an optical telescope.

In absence of external force Centre of mass of double star moves like a free particle. In Centre of mass frame both stars moving in a circle about the Centre of mass which is at rest and both star are diametrically opposite to each other.

Thus in our frame of reference, the trajectories of the stars are a combination of (i) uniform motion in a straight line of the Centre of mass and (ii) circular orbits of the stars about the Centre of mass.

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