General Science | General Studies test | UPSC Civil services Entrance exams Online Objective Test

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

Q1. The discovery that led to development of first antibiotic was made by

A. Pauling

B. Pasteur

C. Flemming

D. Jenner

Answer : Option C
Explaination / Solution:

The discovery of first antibiotic was related to A.Flemming observations about the secretion of some chemicals from Penicillium notatum that prohibited the growth of bacteria.

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

Q2. As Soham, ages with chronic CAD the lumen of his coronary artery may get nearly completely obstructed Result is flow of blood to heart tissue is restricted such that the tissue receives inadequate supply of oxygen rich blood and this condition is diagnosed as :

A. Myocardial infarction

B. Hypertension

C. Myocardial ischemia

D. Heart failure

Answer : Option C
Explaination / Solution:

In case of chronic CAD, the lumen of coronary artery may get nearly completely obstructed that results into restricted flow of blood to heart. The tissue receives inadequate bloods called myocardial ischemia.

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

Q3.

In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of

2 .0 \times 1 0^{10}

Hz and amplitude 48 V

m^{- 1}

.wavelength of the wave and amplitude of the oscillating magnetic field are

A. 2.5

\times 1 0^{- 2} m

, 2.6

\times 1 0^{- 7}

B. 1.8

\times 1 0^{- 2} m

, 1.8

\times 1 0^{- 7}

C. 1.5

\times 1 0^{- 2} m

, 1.6

\times 1 0^{- 7}

D. 2.2

\times 1 0^{- 2} m

, 1.6

\times 1 0^{- 7}

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q4. Which one of the following is paramagnetic?

A. N2

D. O3

Answer : Option C
Explaination / Solution:

The number of electrons in Nitrogen are 7 and in oxygen are 8. Hence the number of electrons that would be present in the molecular orbitals in NO are 7 + 8 = 15. As the number of electrons are odd, all the electrons in NO molecule cannot be paired. Hence, a single electron would be present in a π*2p orbital. Therefore NO is an odd electron species and the gas is hence paramagnetic due to the presence of unpaired electron.

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

Q5. A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5 s, change of flux linkage with the other coil is

A. 30 Wb .

B. 35 Wb

C. 45 Wb

D. 40 Wb

Answer : Option A
Explaination / Solution:

Δϕ=MΔi=1.5×20=30Wb

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

Q6. Lactic acid is formed by the process of

A. Glycolysis

B. Kreb’s cycle

C. Incomplete oxidation

D. Fermentation

Answer : Option C
Explaination / Solution:

Lactic acid is formed by the process of incomplete oxidation of glucose in presence of insufficient oxygen. Lactic acid is formed in muscle cells due to incomplete oxidation to cause cramps.

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

Q7. Potency of injury that can be caused by a radioactive isotope will not depend upon

A. its place of availability

B. its rate of being absorbed and excreted

C. its ionising power

D. its penetrating ability

Answer : Option A
Explaination / Solution:

Radioactive isotopes releases harmful radiations that may cause injury to health. Potency of injury will depends upon its rate of being absorbed or excreted, penetrating ability and its ionizing power and not on the place of availability.

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

Q8. Freons diffuses unchanged into the stratosphere. It can

A. damages the natural ozone balance.

B. Because freons diffuses unchanged into the stratosphere so cannot cause depletion ofozone layer.

C. initiate radical chain in the stratosphere reactions

D. Answers B and C

Answer : Option D
Explaination / Solution:

Freons disturbs the natural ozone balance and initial free radical rxn.

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

Q10. If a beam goes undeflected in Thomson’s experiment, then speed of the electron is (given E = 30 V

c m^{- 1}

and

B = 6 x 10-4 T)

A. 6.5

\times 1 0^{6}

m/s

B. 5.5

\times 1 0^{6}

m/s

C. 5

\times 1 0^{6}

m/s

D. 6

\times 1 0^{6}

m/s

Answer : Option C
Explaination / Solution:

If a beam goes undeflected then

$\begin{aligned} F_{E} = F_{M} \\ q E = q v B \\ E = 30 V c m^{- 1} = 30 \times 100 V m^{- 1} \\ B = 6 \times 10^{- 4} T \\ v = \frac{E}{B} = \frac{30 \times 100}{6 \times 10^{- 4}} = 5 \times 10^{- 6} m / s \end{aligned}$