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

Q1. Medical termination of pregnancy is considered safe up to _________ of pregnancy.

A. Twelve weeks

B. Eight weeks

C. Six weeks

D. Eighteen weeks

Answer : Option A
Explaination / Solution:

Medical termination of pregnancy is considered safe up to twelve weeks or three months. At the end of three months all organs of foetus are formed. It is fetal to mother in case of MTP after three months.

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

Q2. The resistance of a metallic conductor increases due to

A. Change in carrier density

B. increase in the number of collisions between the carriers

C. Change in dimensions of the conductor

D. increase in the rate of collisions between the carriers and vibrating atoms of the conductor

Answer : Option C
Explaination / Solution:

Resistance of a metal of length l , area A is

R = \frac{m l}{n e^{2} τ A}

where n is the carrier density, m the mass of the electron , e the charge of the electron and

τ

, the average time between two collisions. at constant temperature, n and

τ

remain constant.

\frac{m}{n e^{2} τ}

is constant at constant temperature and is called

ρ

∴ R = \frac{ρ l}{A}

The resistance increases if the length increases or the area decreases.

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

Q3. A beam of alpha particles is incident on a target of lead. A particular alpha particle comes in “head-on” to a particular lead nucleus and stops 6.5

\times 1 0^{- 14}

m away from the center of the nucleus. (This point is well outside the nucleus.) Assume that the lead nucleus, which has 82 protons, remains at rest. The mass of the alpha particle is 6.64

\times 1 0^{- 27}

kg . Calculate the electrostatic potential energy at the instant that the alpha particle stops. Express your result in MeV.

A. 3.73 MeV

B. 3.63 MeV

C. 3.83 MeV

D. 3.93 MeV

Answer : Option B
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science National Income and Related Aggregates Prepare / Learn

Q4. Which of the following will you include while estimating domestic product of India?

A. Profits earned by branch of American bank in India.

B. Rent received by resident Indian from his property in Singapore.

C. Salaries of Indians working in Japanese Embassy in India

D. Salaries paid to Koreans working in the Indian embassy in Korea

Answer : Option A
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science Organic compounds containing Nitrogen Prepare / Learn

Q5. When one of the following reacts with NaOH, the product is sodium benzoate

A. benzaldehyde

B. benzoic acid

C. benzene hydroxide

D. benzene

Answer : Option B
Explaination / Solution:

Benzoic acid reacts with NaOH to form sodium benzoate.

UPSC Civil services Entrance exams General Studies test # General Science Electrostatic Potential and Capacitance Prepare / Learn

Q6. A parallel plate capacitor of capacitance C is connected to a battery and is charged to a potential difference V. Another capacitor of capacitance 2C is similarly charged to a potential difference 2V. The charging battery is then disconnected and the capacitors are connected in parallel to each other in such a way that the positive terminal of one is connected to the negative terminal of the other. The final energy of the configuration is

A. zero

B. 9/2CV2

C. 25/6CV2

D. 3/2CV2

Answer : Option D
Explaination / Solution:

The charges Q1 and Q2 on the two capacitors

Q_{1} = C V; Q_{2} = (2 C) (2 V) = 4 C V

.The capacitors are connected in parallel in such a way that the positive plate of one is connected to the negative plate of the other. The common potential

V = \frac{Q_{2} - Q_{1}}{C + 2 C} = \frac{4 C V - C V}{3 C} = V

.The final energy

U_{f} = \frac{1}{2} C V^{2} + \frac{1}{2} (2 C) V^{2} = \frac{3}{2} C V^{2}

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

Q7. Molecular formula represents

A. average fractionall ratio of various atoms present in a compound

B. the exact number of different types of atoms present in a molecule of a compound

C. whole number ratio of different types of atoms present in a molecule of a compound

D. ratio of masses of various atoms present in a compound

Answer : Option B
Explaination / Solution:

Molecular formula is the exact no. of atoms present in a molecule of a compound.

Molecular formula of a compound is related with its empirical formula as ,

Mollecular formula = ( Empirical formula ) n

where n represents a positive integer .

UPSC Civil services Entrance exams General Studies test # General Science Consumers Equilibrium and Demand Prepare / Learn

Q8. One factor that causes a leftward shift of the demand curve out of the following is

A. Fall in income

B. Rise in the price of complementary goods

C. Rise in income

D. Fall in the price of substitute goods

Answer : Option A
Explaination / Solution:
No Explaination.

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

Q9. A thin uniform rod of length 2l and mass M is acted upon a constant torque. The angular velocity changes from zero to ωω in time t. The value of torque is