NEET Unit Test - 2 - NEET MCQ

We know W = mg

At a height h, above the surface of earth, weight is given as,

4/9 x 72

= 32 N

Hooke’s law: a law stating that the strain in a solid is proportional to the applied stress within the elastic limit of that solid.
In the OA line Hooke’s law is valid because stress is directly proportional to strain.

K = power × thickness (m) ÷ area × ∆T
K = (J s^-1) (m) ÷ (m²) (K)
K = J m^-1 s^-1 k^-1

  (orbital speed υ₀ of a satellite)

Near the earth’s surface is equal to 1/√2
times the escape velocity of a particle on earth’s surface) Now from conservation of mechanical energy: Decrease in kinetic energy = increase in potential energy

Axis is along AD so Moment of inertia of first mass is zero and 2nd and 3rd masses are at distance of 6/2 from axis, so by using simply I=mr² we get, I=60×36/4+60×36/4=1080 g cm²

Energy in 1 revolution=2 x P x a x l=2 x 9 x104 x 0.2 x0.6 j=21600J
Energy in n revolutions= 21600nJ
Power=E/t=21600n/t=21600 x 5=18000 J/s= 108000/746 h.p=144.77 h.p.

Stress = F⟂/A = (Mass x Acceleration⟂)/Cross-sectional Area

= (550 kg x 9.8 m/s²)/ (0.30×10−4 m²)

= 1.8×10⁸ Pa

Young's ModulusSteel (Y) = 20×10¹⁰ Pa = Stress/Strain

=> Strain = Stress/Y = 1.8×108 Pa / 20×10¹⁰ Pa

= 9.0×10⁻⁴ 

For the composite system, energy conservation yields no net energy flow in or out of the system.
Let final temperature be T
Then, heat absorbed by A+heat absorbed by B+heat absorbed by C=0

Here in the question m₁=m₂=m₃

Higher the value of K_H, lower is the solubility of gas in the liquid.

(iii) and (iv) will form ideal solutions hence do not form azeotropes. Azeotropes have same composition in liquid and vapour form when distilled.

To determine which binary mixtures will have the same composition in the liquid and vapor phases, we need to identify mixtures that form ideal solutions. In an ideal solution, the composition of the liquid phase and the vapor phase is the same at equilibrium.

Here’s a brief analysis of each mixture:

1. Ethanol + Chloroform:

   • This mixture does not behave ideally due to strong hydrogen bonding interactions between ethanol and chloroform, which can cause deviations from Raoult's Law.

2. Nitric Acid + Water:

   • Nitric acid and water form a non-ideal solution. Nitric acid forms strong hydrogen bonds with water, resulting in significant deviations from ideal behavior. Thus, the composition in the liquid and vapor phases will not be the same.

3. Benzene + Toluene:

   • Benzene and toluene form an ideal solution. The interactions between benzene and toluene are similar, and thus the composition of the liquid and vapor phases will be the same.

4. Ethyl Chloride + Ethyl Bromide:

   • Ethyl chloride and ethyl bromide also form an ideal solution. The interactions between these two similar substances lead to minimal deviations from ideal behavior.

Based on the above analyses, the mixtures that will have the same composition in the liquid and vapor phases are:

2. (iii) and (iv)

So the correct answer is:

2. (iii) and (iv)

Rate of disappearance of SO₂ = Rate of formation of SO₃ But quantity is to be expressed in terms of moles.
Rate of formation of SO₃ = 100 kg SO₃ min-¹ 

NaCl → Na⁺ + Cl⁻
No. of moles of Na⁺ ions = 0.025
No. of Na⁺ ions = 0.025 x 6.023 x 10²³ = 1.505 × 10²²

C₄H₁₀(g) + 13/2O₂  →  4CO₂(g) + 5H₂O(l)
∆N_g = (n_g)_product - (n_g)_reactant
= 4-(13/2+1) = -7/2
or ∆N_g is negative.
∆H = ∆U + ∆N_gRT
SInce ∆n_g is negative therefore ∆H is less than ∆U.

Mass of solvent = 1000 g
Molar mass of urea (NH₂CONH₂) = 60gmol⁻¹
0.25 mole of urea = 0.25 × 60 = 15g
Total mass of solution = 100 + 15 = 1.015kg
1.015 kg of solution contain urea = 15g
2.5 kg of solution = 

For heat added at constant volume, Work doe = 0
∆U = _T1∫^T2 nC_v,mdT
Or ∆U = nC_v,m∆T
∆T = ∆U/nC_v,m = 100/1×33.33 = 3
So, the correct answer is 3

Renal calculi are characterized by the presence of an insoluble mass of crystallized salts within the kidney. These formations can vary in size and composition, often leading to symptoms such as severe pain, hematuria (blood in urine), and urinary obstruction. It is crucial to manage these calculi through dietary changes, hydration, and medical interventions to prevent complications like kidney damage or recurrent stone formation.

Topic in NCERT: Renal calculi

Line in NCERT: "Renal calculi: Stone or insoluble mass of crystallised salts (oxalates, etc.) formed within the kidney."

Topic in NCERT: Structure of Contractile Proteins
Line in NCERT: Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other

The rate of photosynthesis typically stops increasing at about 10% of full sunlight, a point known as light saturation, beyond which other factors become limiting.

Both statements (i) and (iv) are correct. Asthma is a difficulty in breathing caused by inflammation of the bronchi and bronchioles, and the binding of oxygen to hemoglobin is primarily related to the partial pressure of O2.

Statements (ii) and (iii) are not correct. The respiratory system starts at the external nostrils and extends to the alveoli, not the terminal bronchioles. The epiglottis is a flap of cartilage that covers the glottis to prevent the entry of food into the larynx during swallowing, not the other way around.

Auxin is a plant hormone known for its role in promoting cell elongation, especially in the stem. It regulates various aspects of growth and development by facilitating the stretching of cell walls, allowing cells to expand.

Solution: The alveoli are the primary sites for the exchange of gases. They are tiny, balloon-like structures in the lungs where oxygen is absorbed into the blood and carbon dioxide is released from the blood. This process is facilitated by the large surface area and thin walls of the alveoli, making them perfectly suited for gas exchange.

Vascular bundles in which cambium is present between xylem and phloem are called open vascular bundles and those in which cambium is absent are called closed vascular bundles.

The blood circulation from heart to lungs and back to heart is pulmonary circulation and the circulation between heart to tissue and back to heart is systematic circulation and both are included in double circulation.

When facts are used in respiration, the RQ is less than 1, e.g. for the breakdown of tripalmitin,

Topic in NCERT: Respiratory quotient

Line in NCERT: "when carbohydrates are used as substrate and are completely oxidised, the rq will be 1, because equal amounts of co2 and o2 are evolved and consumed, respectively, as shown in the equation below :"