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

Q1. The main plant body of the bryophyte is

A. Haplo-diplontic

B. Diplo-haplontic

C. Haploid

D. Diploid

Answer : Option C
Explaination / Solution:

The main plant body of the bryophyte is haploid. It produces gametes, hence is called a gametophyte.

UPSC Civil services Entrance exams General Studies test # General Science Cell The Unit of Life Prepare / Learn

Q2. The centrioles are absent in

A. Human cell

B. Plant cell

C. Bacterial cell

D. Animal cell

Answer : Option B
Explaination / Solution:

Animal cells have centrioles which are absent in almost all plant cells.

UPSC Civil services Entrance exams General Studies test # General Science Collection of Data Prepare / Learn

Q3. How sample method is differ from census method on the basis of cost?

A. Sample method enssures the correctness of the data

B. Census is less time consuming

C. It is less expensive

D. It is suitable when universe comprises of homogeneous nature

Answer : Option C
Explaination / Solution:

Under sampling technique a lot of expenses are saved both in terms of money and energy not only in the collection of data but also in the ministration, transport and training etc. This is because in sample technique only an action of the population is studied and examined to arrive at the desired conclusion, thus, economy is maintained in all the phases of the enquiry conducted under this technique.

UPSC Civil services Entrance exams General Studies test # General Science Environment Sustainable Economic Development Prepare / Learn

Q4. Which of the following are renewable resources (i) Trees (ii) Coal (iii) Water (iv) Fish. Options are

A. I,IV

B. II,III

C. I,III

D. I, II

Answer : Option A
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science Molecular Basis of Inheritance Prepare / Learn

Q5. Operon concept was given by

A. Griffith and Monod

B. Jacob and Sharp

C. Roberts and Sharp

D. Francois Jacob and Jacques Monod

Answer : Option D
Explaination / Solution:

Jacob and Monod (1961) gave the concept of Operon model to explain the gene regulation in prokaryotes using simple experiments to grow E. coli in petriplates containing histidine, lactose or lactose and glucose in the medium.

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

Q6. Reactance of a 3.00-H inductor at a frequency of 80.0 Hz is

A. 1480 Ω

B. 1490 Ω

C. 1500 Ω

D. 1508 Ω

Answer : Option D
Explaination / Solution:

L = 3 H

f = 80 Hz

Inductive reactance $X_{L} = ω L = 2 π f L = 2 \times 3.14 \times 80 \times 3 = 1508 Ω$

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

Q7. In a Wheatstone’s bridge, P = 9 ohms, Q = 11 ohms, R = 4 ohms and S = 6 ohms. How much resistance must be put in parallel to the resistance S to balance the wheatstone bridge?

A. 26.4 ohms

B. (44/9) ohms

C. 18.7 ohms

D. 24 ohms

Answer : Option A
Explaination / Solution:

Let a resistance M be put in parallel to S and the equivalent resistance of the parallel combination be X. In the bridge balance condition

$\begin{array}{l} \frac{X}{R} = \frac{Q}{P} \\ \Rightarrow X = R \times (\frac{Q}{P}) \\ X = 4 \times \frac{11}{9} = \frac{44}{9} \end{array}$

In the parallel combination of S and M,

$\begin{array}{l} \begin{array}{l} \frac{1}{X} = \frac{1}{S} + \frac{1}{M} \\ \frac{1}{M} = \frac{1}{X} - \frac{1}{S} \\ \Rightarrow \frac{1}{M} = \frac{9}{44} - \frac{1}{6} = \frac{10}{264} \end{array} \\ ∴ M = 26.4 Ω \end{array}$

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

Q8. Two pendulums have time periods T and 5T/4. They are in phase at their mean positions at some instant of time. What will be their phase difference when the bigger pendulum completes one oscillation?

A. 30

^{0}

B. 60

^{0}

C. 45

^{0}

D. 90

^{0}

Answer : Option D
Explaination / Solution:

Assuming bigger pendulum as the pendulum of bigger time period i.e.having time period $5 T / 4$

As the two pendulums start at the same time in simple harmonic motion from the mean position,their initial phase angles are zero

The bigger pendulum completes its one oscillation in time $t = 5 T / 4$ and comes back to the mean position.During this time the point on reference circle associated with SHM rotates by an angle 2π

If ω represents the angular velocity of the reference point associated with SHM of first pendulum of time period T,then the phase of the this pendulum after $5 T / 4$ s willbe

$ω 5 T / 4 = ω T + ω T / 4$

$= 2 π + 2 π / 4$

$2 π + π / 2$

Hence the phase difference

$2 π + π / 2 - 2 π = π / 2$

= 90 $^{0}$

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

Q9.

The peroxide that gives H2O2 on treatment with dilute $H_{2} S O_{4}$ is

A. TiO2

B. MnO2

C. PbO2

D. BaO2

Answer : Option D
Explaination / Solution:

Barium peroxide react with sulfuric acid to produce hydrogen peroxide and barium sulfate.

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

Q10. The entire collections of plants/seeds having all diverse alleles for all the genes of a crop is called

A. Genome

B. Germplasm

C. Herbarium

D. Gene library

Answer : Option B
Explaination / Solution:

The entire collections of plants, seeds, plant parts having all diverse alleles for all the genes of a crop is called germplasm collections. Different parts of plants are kept at different temperature.

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