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

Q1. Arrange the following in descending order based upon number of carbon atoms in Kreb cycle a) α-ketoglutaric acid b) citric acid c) Acetyl coA d) Succinic acid

A. a), b), c), d)

B. a), d), b), c)

C. b), a), d), c)

D. b), c), d), a)

Answer : Option C
Explaination / Solution:

In kerb cycle citric acid consists of 6C atoms ,α-ketoglutaric acid consist of 5C atoms, succinic acid consists of 4 C atoms and Acetyl co A consists of 2C atoms,

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

Q2.

In $B F_{3}$ , molecule below the dipole moment is zero although the B- F bonds are oriented at an angle of $12 0^{0}$ to one another. Net dipole moment in $B F_{3}$ molecule is

A. zero

B. one

C. three

D. two

Answer : Option A
Explaination / Solution:

BF3 has symmetrical structure in which the three B-F bonds are oriented at an angle of 120° to one another. Also the three bonds lie in one plane and the dipole moments of these bonds cancel one another giving net dipole moment equal to zero.

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

Q3.

A rectangular loop and a circular loop are moving out of a uniform magnetic field region to a field-free region with a constant velocity v as shown in fig. In which loop do you except the induced EMF to be constant during the passage out of the field region if the field is normal to the loops.

A. Both of them

B. rectangular loop

C. none

D. circular loop

Answer : Option B
Explaination / Solution:

The induced EMF is expected to be constant in the case of a rectangular loop. In case of a circular loop, the rate of change of area of the loop during the passage out of the field region is not constant, whereas it is constant for rectangular loop.

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

Q4. In order to increase the kinetic energy of ejected photoelectrons, there should be an increase in

A. Both the wavelength and intensity of radiation

B. intensity of radiation

C. wavelength of radiation

D. frequency of radiation

Answer : Option D
Explaination / Solution:

$K_{max} = h v - ϕ_{0}$

Work function depends only on nature of metal.

So that kinetic energy of an electron increase when frequency of radiation increases.

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

Q5. Soil pollution :
i. can be of two types- positive and negative
ii. soil erosion is an example of positive soil pollution

A. both the statements are wrong

B. both the statements are correct

C. Statement ii) is correct but i) is wrong

D. Statement i) is correct but ii) is wrong

Answer : Option D
Explaination / Solution:

Addition of harmful substances in soil is called soil pollution. Soil pollution is of two types positive and negative. Addition of organic wastes increase the productivity so positive. Soil erosion is the removal of top fertile layer of soil that reduce its fertility so it is a negative soil pollution.

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

Q6. Grignard reagent should be prepared under anhydrous conditions because

A. the carbon – Mg bond is covalent but polar

B. They are highly reactive

C. All the below

D. the Mg – halogen bond is ionic

Answer : Option C
Explaination / Solution:

R—MgX is very reactive.

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

Q8.

The acceleration due to gravity at the North Pole of Neptune is approximately 10.7 m/s2 . Neptune has mass 1.0 $\times$ $1 0^{26}$ kg and radius 2.5 $\times$ $1 0^{4}$ km and rotates once around its axis in about 16 h. What is the gravitational force on a 5.0-kg object at the north pole of Neptune?