MHT CET Mock Test - 5 - JEE MCQ

Escape velocity is the minimum velocity with which the body has to be projected vertically upwards from the surface of the earth so that it crosses the gravitational field of earth and never returns back on its own.

The mechanism of transfer of heat between two adjacent parts of a body because of their temperature difference is known as conduction. This is the definition of conduction.

An oscillator is an electronic circuit that converts DC from a power supply to an AC signal. An oscillator produces a periodic and oscillating signal. An oscillator is like an amplifier that gives positive feedback to the circuit. Positive feedback means that a portion of output is combined in phase with the input.

ε₁+ε₂=I₁R,ε₁−ε₂=I₂R
Dividing ε₁=( I₁+I₂/I₁-I₂)ε₂

Voltage gain   =β× (R_c​​/R_b​)
Or,   Voltage gain =0.6×(24/3)​=4.8

Potential difference(V) across the terminals of a cell
i. Discharging of cell when cell is supplying current,
Therefore, V=V_P+V_Q=E-Ir, i,r., V<E
ii. charging of cell when cell is taking current,
V=VP-V_Q=E+Ir, i.e., V>E
iii. When the cell is short circuited i.e., external resistance is zero,
=> I=E/r
=>  V=V_P-V_Q=E-Ir=0 i.e., V=0

Stable equilibrium is attained when potential energy of the dipole system is minimum which is possible at an inclination of 0°.

Given, the maximum kinetic energy: K_max​=4eV
If V₀​ be the stopping potential, then K_max​=eV_0​
⇒eV_0​=4eV 
⇒V₀​=4V

When a diamagnetic material is placed in an external magnetic field the spin motion of electrons is so modified that the electrons which produce the moments in the direction of the external field show down while the electrons which produce magnetic moments in opposite directions get accelerated.
Thus, a net magnetic moment is induced in the opposite direction of the applied magnetic field. Hence the substance is magnetized opposite of the external field. Thus, it moves from stronger. Weaker parts of the magnetic.
 

The correct answer is Option B.
Potassium soaps are softer to the skin than sodium soaps. These can be prepared by using potassium hydroxide solution in place of sodium hydroxide.
Potassium soaps are used in shampoo, shaving cream and bathing soaps etc sodium soaps are toilet soaps used for washing purposes.
 

Explanation: The atom which defines the structure of a family of organic compounds and their properties is called a functional group. Functional groups are specific groups of atoms or bonds within molecules that are responsible for the characteristic chemical reactions of those molecules.

Aggregation of colloidal particles into insoluble precipitate by addition of some suitable electrolyte is called coagulation.

Teflon has CF₂=CF₂ as monomer unit.

Epoxidation is an example of electrophilic ad dition at olefin ic bonds. Therefore, greater the electron density at olefinic bond, greater its reactivity. Electron donating groups increases reactivity while electron withdrawing group s like — CF₃ decreases reactivity.

Greater the number of hydroxy groups , greater its a bility to form H-bonds with water, hence greater solubility.

Antioxidants are additives capable of delaying or preventing rancidity of food due to oxidation, and therefore, lengthen the shelf life of products. They are very important in the food industry because they allow foods to conserve their nutritional properties and their quality levels. Antioxidants do not improve the quality of food, but it does help them to keep for a longer period of time. There is a wide variety of antioxidants from natural and synthetic origin, which are usually used in food. The most common uses of antioxidants are oils, margarines, confectionery, baked goods, pastries, snacks, cereals and sauces. Some natural antioxidants used in the food industry are Tocopherols, Ascorbic Acid or Rosemary Extract.

In S_N1 reaction, some of the substrate, even after ionisation, remains associated as an intimate ion pair preventing nucleophilic attacks from front side and gives inverted product.

Due to partial reaction of nucleophile with intimate ion pair, net inversion of configuration is observed although predominant reaction occurs at planar carbocation giving racemic products.

It gives racemic mixture of oxiranes.

(a)

Nearest neighbours are along the diagonal at the half distance apart, Diagonal AB = √3a

∴ Distance of the nearest neighbour

Next nearest neighbours are along the cell edge = 520 pm

K-atom at the centre is surrounded by eight K-atoms as nearest neighbours.

In bcc, coordination number is six as next nearest neighbours

Each type of RNA functions differently, among them mRNA which is also known as messenger RNA carries genetic information from DNA in the form of series of a three-base codon, which specifies the amino acid.

C₄H₁₀ = 80 ml
CH₄ = xml  CO = y ml
x + y = 120 ml

total CO₂ volume
= 320 + x + y ml
= 320 + 120
= 440 ml

The correct answer is option C
CH_3​CH₂​CONH₂​ (A)⟶ CH₃​ − CH₂ ​− NH₂​ (B)⟶ ​CH_3​ − CH₂ ​− OH
In the above sequence A & B respectively are Br₂​/KOH and HNO₂​
The first step is Hoffmann bromamide degradation reaction in which an amide (propanamide) is converted to an amine  (ethylamine) containing one carbon atom less. The reagent A is bromine in presence of KOH. In the second step, aliphatic primary amine (ethyl amine) reacts with nitrous acid (reagent B) to form aliphatic primary alcohol (ethyl alcohol).
 

Out of integers from 1 to 11, there are 5 even and 6 odd integers.
Let A – both the numbers chosen are odd
B –sum of the numbers chosen is even. 

The two curves meet in (0 , 0) and (1, 1).The required area lies above the curve y = x² and below x = y² and is equal to ;

Hence ,slope of tangent at (a , b) = -b/a . Therefore , the equation of tangent at (a , b ) is ;