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

Q1. Cutting and tiding of fallopian tube to avoid pregnancy is called

A. Sterilisation

B. Vasectomy

C. Tubectomy

D. Copper T

Answer : Option C
Explaination / Solution:

Cutting and tiding of fallopian tube to avoid pregnancy is called tubectomy. It is a surgical method of contraception. This method is used only when no more child is required in future. It can be done only in female.

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

Q2. It is found experimentally that for small thickness t, the number of α-particles scattered at moderate angles is proportional to t. What clue does this linear dependence on t provide?

A. scattering is predominantly due to multiple collisions

B. scattering is predominantly due to deflecting fields being proportional to t

C. scattering is predominantly due to no collison

D. scattering is predominantly due to a single collision

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q3. National Income is a

A. Stock concept

B. Hypothetical concept

C. Non economic concept

D. Flow concept

Answer : Option E
Explaination / Solution:
No Explaination.

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

Q4. Benzene diazonium chloride reacts with phenol in which the phenol molecule at its para position is coupled with the diazonium salt to form p – hydroxyazobenzene

A. Carbon tetra chloride

B. DDT

C. Iodoform

D. Coupling reaction

Answer : Option D
Explaination / Solution:

This normal N-N coupling.

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

Q5. The plates of a parallel plate capacitor are 10 cm apart and have area equal to 2m². If the charge on each plate is

8.85 \times 1 0^{- 10} C

, the electric field at a point

A. outside the plates will be zero

B. between the plates will change from point to point

C. between the plates will be

25 N C^{- 1}

D. between the plates will be zero

Answer : Option A
Explaination / Solution:

The electric field outside two large plates with opposite charge densities will be zero.

The electric field between the plates of the capacitor

and it is a constant electric field.

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

Q6.

For the reaction

Which is the limiting reagent for this reaction ?

A. H2O

B. N2O4

C. N2

D. N2H4

Answer : Option B
Explaination / Solution:

Chemical reactions rarely occur completely when exactly the right amounts of reactants are taken to react together to yield products as per its stoichiometry .One of the reactants will be used up ,before another runs out.Thus , the reactant which is consumed first is known as limiting reagent

For the given reaction ,

2 N2 H4 (l) + N2 O4 (l) ------> 3 N2 (g) + 4 H2 O (l)

as per its stoichiometry , if only the right and exact amount of N2 O4 is taken , the reaction may not go to completion .As such it would be consumed first & is , therefore , the limiting reagent.

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

Q7. Weak Nuclear Force

A. is responsible for a common form of radioactivity called beta decay

B. is responsible for holding the electrons and the nucleus together

C. is responsible for holding the electrons of the nucleus together

D. is responsible for holding the constituents of the nucleus together

Answer : Option A
Explaination / Solution:

The weak nuclear force stops a neutron from decaying into a proton and an electron. When this happens, an electron leaves the atom. This is known as beta decay.

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

Q8. The value of elasticity in case of a horizontal line will be

A. One

B. Zero

C. Infinity

D. Greater than one

Answer : Option C
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 circular ring of mass M and radius R is rotating about its central axis with angular velocity. Four point objects each of mass m are attached gently to the opposite ends of two perpendicular diameters, the angular velocity of the ring is given by

A. MM+4m⋅ω

B. M+4mM⋅ω

C. M−4mM+4m⋅ω

D. MM+m⋅ω

Answer : Option A
Explaination / Solution:

Let $ω$ be the angular velocity of the Ring of Mass M , thus the moment of inetia about given axis is I1 = $M R^{2}$ and the four point objects are genlty placed at perpendicular diameters at opposite end, so thus the distance of each object from axis of rotation is R, so total moment of inetia of ring and four objects is I2 = $M R^{2} + 4 m R^{2}$

According to law of conservation of angular momentum I1 $ω$ = I2 $ω$ 2 , So on solving $ω_{2} = (\frac{M R^{2}}{M R^{2} + 4 m R^{2}}) ω$ = $\frac{M}{M + 4 m} \cdot ω$

UPSC Civil services Entrance exams General Studies test # General Science Mechanical Properties of Fluids Prepare / Learn

Q10. It is easier to spray water to which soap is added, because

A. Addition of soap to water increases its density

B. Addition of soap to water makes surface tension of water zero

C. Addition of soap to water decreases surface tension of water

D. Addition of soap to water increases surface tension of water

Answer : Option C
Explaination / Solution:

Addition of soap decreases the surface tension of water , as we know the energy of spraying is directly proportional to the surface tension .