COMEDK Mock Test - 5 - JEE MCQ

This represents the XOR function.

157900  implies that the population is believed to be within the range of about 157850 to about 157950.

In other words, the population is 157900 ± 50. The “plus-or-minus 50” appended to this number means that we consider the absolute uncertainty of the population measurement to be 50 – (–50) = 100.

We can also say that the relative uncertainty is 100/157900, which we can also express as 1 part in 1579, or 1/1579 = 0.000633, or about 0.06 percent.

∴

Hence, zero is the correct answer.

in horizontal direction  

in vertical direction

Since, P_r​=P_b​ 
r for red and b for blue.
P_r​=P_b​
or, n_r​× (hc/λr)  ​=nb​× (hc​/λ_b)​
or,  ​(n_r/n_b)​​= λ_r​​/λ_b ​
Since, the wavelength of red bulb is greater than the wavelength of blue bulb.
or,  n_r​>n_b

Acceleration,

Acceleration will be zero when,

At t = 0, v = 0.

Let p0 = atmospheric pressure,

p1 and p2 = pressures inside the two bubbles

Let r = radius of curvature of the common surface

Red light and blue light have different wavelengths and different frequencies. Blue light has shorter waves, with wavelengths between about 450 and 495 nanometres. Red light has longer waves, with wavelengths around 620 to 750 nanometres. Blue light has a higher frequency and carries more energy than red light.

Length , l = 4,234 m
Breadth, b = 1.005 m
Thickness , t = 2.01 x 10^-2 m
Volume = l x b x t
⇒ V = 4.234 x 1.005 x 0.0201 = 0.0855289 = 0.0855 m³ (significant figure = 3)

The electronic configurations of the given elements are -

Removal of two electrons from Eu gives it the configuration [Xe] 4f⁷ which is a stable half-filled configuration.

(a) Nylon−6,6 is the polymer of hexamethylene diamine and adipic acid. It is made by the condensation of given monomers.

(b) Nylon−6 os also a condensation polymer of caprolactum. It is a polymide.

(c) Dacron is also a condensation polymer of ethylene glycol and terephthalic acid. It is an example of polyester.

(d) Buna−S is an addition polymer of 1,3, butadiene and styrene.

Hence, only (4) is not a condensation polymer.

∴ (4) is the correct option.

H_β line is formed due to the transition of electrons from 4 to 2.

 for a strong acid and a strong base = 
Let 
NaOH, CH₃COONa are strong electrolytes and are fully dissociated in the aqueous solutions.
∴ -57.1 - x = -55.9
x = -1.2 kJ mol^-1
Therefore, 

For the reaction: P + 2Q → R, when concentration of 'Q' is doubled, the half-life does not change, hence reaction is first-order with respect to 'Q'.
This is because for the first order reaction, rate constant is independent from initial concentration of the reactant.
When the concentration of 'P' is made four times, the rate of reaction becomes double. It means the reaction is half-order with respect to 'P'.
Hence, the rate law expression is:

Overall order = 1 + 1/2 = 3/2
Units of the rate constant = (mol L^-1)^{(1 - n)} s^-1
So, unit of rate constant is L^1/2 mol^-1/2 s^-1.

Total vapour pressure (VP) of mixture = VP of pentane in mixture + VP of hexane in mixture
P_T = (Mole fraction of pentane × VP of pentane) + (Mole fraction of hexane × VP of hexane)
P_T = 
VP of pentane in mixture = VP of mixture × Mole fraction of pentane in vapour
88 = 184 x Mole fraction of pentane in vapour
Or, mole fraction of pentane in the vapour phase = 88/184 = 0.4782 

Sorption is the common term used for both absorption and adsorption. Absorption is the incorporation of a substance in one state into another of a different state (e.g., liquids being absorbed by a solid or gases being absorbed by water). Adsorption is the physical adherence or bonding of ions and molecules onto the surface of another molecule. The term 'sorption' is preferred when it is suspected that both processes are operative.

Volume strength of H₂O₂ = Normality × 5.6

According to law of equivalence.

N₁V₁(KMnO₄) = N₂V₂(H₂O₂)

2 × 100 = 1.786 × V₂

Radium is an extremely rare element which was first discovered in 1898 by Pierre and Marie Curie. Marie Curie was awarded with a second Nobel Prize in 1911 for her discovery of radium: a Prize in chemistry, this time, making her the first woman to be awarded with a Nobel Prize in this particular field. The isotopes of radium are highly radioactive, with the most stable isotope being radium−226, which has a half-life of 1600 years and decays into radon gas.

On April 20, 1902, Marie and Pierre Curie successfully isolate radioactive radium salts from the mineral pitchblende in their laboratory in Paris. In 1898, the Curies discovered the existence of the element radium in their research of pitch blende.

= 1.10 - 0.0295
= 1.0705 V