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

Q2.

If an electron accelerated from rest through a potential of 200 V acquires a speed of 8.4 $\times 1 0^{6} m s^{- 1}$ , then its e/m is

A. 1.86

\times 1 0^{11} C k g^{- 1}

B. 1.76

\times 1 0^{11} C k g^{- 1}

C. 1.66

\times 1 0^{11} C k g^{- 1}

D. 1.96

\times 1 0^{11} C k g^{- 1}

Answer : Option B
Explaination / Solution:

eV0=12mv2em=v22V0=(8.4×106)22×200=1.76×1011CKg−1

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

Q3. Why does the solubility of alkaline earth metal carbonates and sulphates in water decrease down the group?

A. lattice enthalpy decreases down the group

B. size of anions being much shorterer compared to cations

C. hydration enthalpy decreases down the group

D. coordination numbesr more than four

Answer : Option C
Explaination / Solution:

Solubility of sulphates and carbonates decreases down the group because of decrease in hydration energy. which is insufficient to over come the lattice energy of ions.

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

Q4. With reference to the figure the value of

d_{M}

can be calculated by

A. dM=2RhT−−−−−√

B. dM=2RhR−−−−−√

C. dM=2RhT−−−−−√+2RhR−−−−√

D. dM=2RhT−−−−−√+RhR−−−−√

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q5. Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. Name the type of intermediate formed in the first step of the following addition reaction.

H_{3} C - - - HC = C H_{2} + H^{+} \to ?

1^{\circ}

Carbanion

1^{\circ}

Carbocation

2^{\circ}

Carbanion

1^{\circ}

Carbocation

Answer : Option B
Explaination / Solution:

A secondary carbocation is formed.

UPSC Civil services Entrance exams General Studies test # General Science Indian Economy on the Eve of Independence Prepare / Learn

Q7. Jute industries were dominated by

A. None

B. Indian

C. Both

D. Foreigners

Answer : Option D
Explaination / Solution:

The jute mills dominated by the foreigners were mainly concentrated in Bengal.

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

Q8. The half life periods of a reaction at initial concentration 0.1 mol/L and 0.5 mol/L are 200 s and 40 s respectively. The order of the reaction is

A. 12

Answer : Option D
Explaination / Solution:

As initial concentration is increased half life is decreasing so order of reaction is 2.

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

Q9. Which of the following is not rule for constructing a line graph

A. Both Y-scale and X-scale must be labeled

B. Equal magnitude must be represented by equal distances

C. None

D. Y scale must begin at one as origin similarly Y-scale

Answer : Option D
Explaination / Solution:

An arithmetic line graph is also called time series graph. In this graph time (hour, day/date, week, month, year, etc.) is plotted along x-axis and the value of the variable (time series data) along y-axis. A line graph by joining these plotted points, thus, obtained is called arithmetic line graph (time series graph). It helps in understanding the trend, periodicity, etc. in a long term time series data.

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

Q10. An instrument used by government to stabilise prices

A. SSP

B. SHP

C. Buffer Stock

D. MSP

Answer : Option C
Explaination / Solution:

Buffer stock is an instrument use by the government to stablise price. it is built up in the years of surplus production and is used during shortage. Such a policy ensures regularity in supply even when production is uneven.