Practice Test - NEET MCQ

We can use a capacitor of suitable capacitance as a choke coil because the average power consumed per cycle in an ideal capacitor is zero. Therefore, like a choke coil, a condenser can reduce AC without power dissipation.

equation of alternating voltage , E = 200√2sin(100t)
compare this equation with E₀sin(ωt)
so,  E₀=200√2 volts
ω= 100 rad/s
now, E_rms=E₀/√2
= 200√2/√2 = 200 volts .
given, capacitance of capacitor, C = 10^-6 F
so, reactance of capacitor,  X_C=1/ω_C
=1/(10^-6x100)
=10⁴
so, the reading of Ammeter, I=E_rms/X_C
= 200/10⁴ A = 20 × 10^-3 A = 20mA
hence, option (b) is correct.

The opposition offered by a capacitor for the flow of A.C is called capacitive reactance.
Xc = 1/wC
it's SI unit is ohm

As we know,
Average power in ac circuit is given by P=V_rms​i_rms​cosϕ 
For pure capacitive circuit ϕ=90^o so P=0

Natural Frequency of an LC Oscillator

- The natural frequency of an LC oscillator is determined by the values of the inductance (L) and capacitance (C) in the circuit.

- The LC oscillator is a type of oscillator circuit that uses a combination of inductors and capacitors to generate oscillations at a specific frequency.

- The natural frequency of an LC oscillator can be calculated using the formula:

f = 1 / (2 * π * √(LC))
 

As charges and velocities are same
F=q(V×B)
So having the same magnitude of charge and same velocity, they'll experience the same magnitude of force.

Given, i₁​=i₂​=i
∴F=μ_0​i²l​/2πb
Hence, force per unit length is F=μ₀​i²​/2πb

The long straight wire and side AB  carry current in the same direction, hence will attract each other.
The long straight wire and side CD carry current in the opposite direction, hence will repel each other.
Force on side BC  will be equal and opposite to force on side DA.
Since CD  is farther from the wire than AB,  the force of attraction on  AB  will exceed the force of repulsion on CD.
Hence, there will be a net force of attraction on the loop ABCD and it will move towards the wire.

parallel currents attract from the below figure.
and similarly, in antiparallel currents repel.parallel currents attract from the below figure.
and similarly, in antiparallel currents repel.

Tert-butyl chloride forms most stable 3° carbocation. So will give white precipitate of AgCl with AgNO₃ solution immediately.

Hence, option (B) is the answer.

During racemisation, carbocation intermediate is formed.

Hence option (A) is the answer.

Reactivity in S_N2 is inversely proportional to steric hindrance.

Hence the correct order of reactivity is CH₃Cl > CH₃CH₂Cl > (CH₃)₂CHCl > (CH₃)₃CCl

Hence, Option (c) is the answer.

In order to obtain ethoxy ethane from ethanol, the ethanol must be subjected to the effect of concentrated sulphuric acid at 413 Kelvin or 140°C as shown below:

Reaction involves rearrangement of carbocation

It is an oxo process of synthesis of alcohols.

The triploblastic animals have three prominent germ layers known as ectoderm, endoderm and mesoderm. Thymus gland develops from two hollow elongations (third and fourth pharyngeal pouches) of endoderm which descends to the embryonic thorax by the end of eight weeks of gestation. The lymphoid cells of the gland originate from mesoderm. Thus, the correct answer is option B.

Addison's disease is caused due to hyposecretion of steroid hormones from adrenal glands. The steroid hormones are cortisol and aldosterone which are secreted from adrenal cortex.
Cretinism is the retarded mental and physical development due to hyposecretion of thyroid hormones.
Dwarfism is the retarded physical development due to hyposecretion of growth hormone during period of skeletal growth.
Sterility is the inability of an individual to produce offspring.
So, the correct answer is 'Addison's disease'.

The term Lipid was coined by Bloor. Lipids are the esters of fatty acid and alcohol. These are hydrophobic that is these are insoluble in water but soluble in benzene, ether and chloroform. As these are insoluble in water when they are added with water they separate to form two layers.

Starch can hold I₂ (iodine) molecules in the helical portion. The starch-I₂ is blue in colour. Cellulose does not contain complex helices and hence cannot hold I₂ and hence remain colourless.

Nissl’s grains are mainly present in cyton and dendrite and absent in axons.

These granules are rough endoplasmic reticulum with rosettes of the free ribosome, the site for protein synthesis.

• Thalamus is the part of the brain that acts as a relay center to receive and transmit general sensations except for smell.
• It is located in the forebrain superior to the midbrain.
• It receives and processes almost all types of sensory information except for the sense of smell, which is processed by the olfactory bulb. 
• The thalamus then sends this information to the appropriate areas of the cerebral cortex, where it is further processed and interpreted.

In our body, the neural and the endocrine system jointly coordinate and integrate all the activities of the organs so that they function in a synchronised fashion.

• Brain cavities are filled with cerebrospinal fluid (CSF). In subarachnoid space, the CSF acts as shockproof cushion to prevent injury in case of an accident.
• It also helps to distribute nutrients and remove waste products from the brain and spinal cord, and it helps to regulate the pressure inside the skull by providing a hydraulic cushion.

Coordination is the process through which two or more organs interact and complement the functions of one another. For example, the functions of muscles, lungs, heart, blood vessels, kidney, and other organs are coordinated while performing physical exercises.

• Nerve fibres do not show the property of elasticity and contractility. Nerve fibres are specialized to transmit impulses form one part of the body to other.
• These properties are typically associated with muscle cells. Elasticity refers to the ability of a material to return to its original shape after being stretched or deformed, while contractility refers to the ability of muscle cells to generate force and contract.

The thick segment of the ascending limb of Henle's loop extends as DCT. Cortical nephrons do not have vasa recta. PCT and DCT are situated in cortex of the kidney. Bowman's capsule encloses the glomerulus.