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

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

Q1. When methylamine reacts with HCl the product is

A. methane and methyl chloride

B. methyl ammonium chloride

C. methylammonia

D. methonoate chloride

Answer : Option B
Explaination / Solution:

M e N H 2

reacts with HCl to form salt.

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

Q2.

Consider the situation shown in the figure. The capacitor A has a charge q on it whereas B is uncharged. The charge appearing on the capacitor B a long time after the switch is closed is

A. q/2

B. 2q

C. q

D. zero

Answer : Option D
Explaination / Solution:

the charge –q is bound to the charge +q. Therefore no charge will appear on the capacitor B. The capacitor B will acquire a charge only if a battery ( driving force) is put in the circuit.

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

Q3. One mole is the amount of a substance that contains as many particles or entities as there are atoms in

A. exactly 14 g (or 0.014 kg) of the

^{14} C

isotope

B. exactly 12 g (or 0.012 kg) of the

^{14} C

isotope

C. exactly 12 g (or 0.012 kg) of the

^{14} C

isotope

D. exactly 12 g (or 0.012 kg) of the

^{13} C

isotope

Answer : Option C
Explaination / Solution:

One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g of the $^{12} C$ isotope .

A mole of a substance always contains the same number of entities , no matter what the substance may be. In order to determine this number precisely , the mass of carbon -12 atom was determined by mass spectrometer and found to be equal to 1.992648 x 10-23 g. Knowing that one mole of carbon weighs 12 g . the number of atoms in it is equal to :

6.0221367 x 1023

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

Q4. The marginal product is above the average product curve, when the average product is:

A. None of above

B. Increasing

C. Decreasing

D. Becomes constant

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

Q5.

Three thin uniform rods each of mass M and length L are placed along the three axis of a Cartesian coordinate system with one end of each rod at the origin. The M.I. of the system about z- axis is

M L^{2}

M L^{2}

(2/3)ML2

M L^{2}

M L^{2}

M L^{2}

M L^{2}

Answer : Option B
Explaination / Solution:

Moment of inertia about an axis passing through edge

$I = \frac{M L^{2}}{3}$

Moment of inertia of system about z-axis

$\begin{aligned} I = I_{x} + I_{y} + I_{z} \\ I = \frac{M L^{2}}{3} + \frac{M L^{2}}{3} + 0 \\ I = \frac{2}{3} M L^{2} \end{aligned}$

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

Q6. Soldering of two metals possible because of the property of

A. viscosity

B. surface tension

C. osmosis

D. cohesion

Answer : Option D
Explaination / Solution:
No Explaination.

UPSC Civil services Entrance exams General Studies test # General Science Structural Organisation in Animals Prepare / Learn

Q7. The lymph in frog lacks

A. WBCs and few proteins

B. RBCs and few proteins.

C. Plasma and WBCs

D. RBC and plasma

Answer : Option B
Explaination / Solution:

The lymph is different from blood. It is known as tissue fluid. Lymph is yellowish in colour as it lacks RBCs and few proteins.

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

Q8.

Identify the virus in figure given below

A. TMV

B. Bacteriophage

C. Retrovirus

D. HIV

Answer : Option B
Explaination / Solution:

A bacteriophage is a virus that infects and replicates within a bacterium.Bacteriophages are composed of proteins that encapsulate a DNA or RNA genome, and may have relatively simple or elaborate structures.

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

Q9. The law of conservation of energy is.

A. is valid only for Newtonian mechanics

B. thought to be valid across all domains of nature, from the microscopic to the macroscopic

C. is valid only for relativistic mechanics

D. is valid only for applied mechanics

Answer : Option B
Explaination / Solution:

The law of conservation of energy is thought to be valid across all domains of nature, from the microscopic to the macroscopic. It is routinely applied in the analysis of atomic, nuclear and elementary particle processes. At the other end. all kinds of violent phenomena occur in the universe all the time. Yet the total energy of the universe (the most ideal isolated system possible!) is believed to remain unchanged.

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

Q10. The general formula of a cycloalkane is