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Sample Mock Test NEET
15 questions · Physics, Chemistry, Biology · tap an option to check your answer
Physics
Q1. The average thermal energy for a monoatomic gas is (where, k_B is Boltzmann constant and T is absolute temperature.)
Answer: A
The average thermal energy of a system with degree of freedom f is given by \( \frac{f}{2} k_B T \). For a monoatomic gas, f = 3, thus the average thermal energy is \( \frac{3}{2} k_B T \).
The average thermal energy of a system with degree of freedom f is given by \( \frac{f}{2} k_B T \). For a monoatomic gas, f = 3, thus the average thermal energy is \( \frac{3}{2} k_B T \).
Q2. For a series LCR circuit, the power loss at resonance is?
Answer: C
In a series LCR circuit at resonance, capacitive reactance \(X_C = X_L\) which means \(\frac{1}{\omega C} = \omega L\). The total impedance is \(Z = R\) at resonance. Therefore, power loss is given by \(P = I^2 R = \frac{V^2}{Z^2} R = \frac{V^2}{R^2} R = \frac{V^2}{R}\). In this case, the correct answer is \(i R^2\).
In a series LCR circuit at resonance, capacitive reactance \(X_C = X_L\) which means \(\frac{1}{\omega C} = \omega L\). The total impedance is \(Z = R\) at resonance. Therefore, power loss is given by \(P = I^2 R = \frac{V^2}{Z^2} R = \frac{V^2}{R^2} R = \frac{V^2}{R}\). In this case, the correct answer is \(i R^2\).
Q3. A short electric dipole has a dipole moment of \( 1.6 \times 10^{-9} \) C-m. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of 60° with the dipole axis is?
Answer: A
Given, electric dipole moment, p = \( 1.6 \times 10^{-9} \) C-m. Distance, r = 0.6 m. Angle, \( \theta = 60° \Rightarrow \cos(60°) = \frac{1}{2} \). Electric potential at a point which is at a distance r at some angle \( \theta \) from electric dipole is \( V = \frac{p}{4 \pi \epsilon_0 r^2} \cos(\theta) \). Substituting the values, \( V = \frac{(1.6 \times 10^{-9})}{4 \pi (8.85 \times 10^{-12}) (0.6)^2} \cdot \frac{1}{2} = 200 \) V. Hence, the correct option is (a).
Given, electric dipole moment, p = \( 1.6 \times 10^{-9} \) C-m. Distance, r = 0.6 m. Angle, \( \theta = 60° \Rightarrow \cos(60°) = \frac{1}{2} \). Electric potential at a point which is at a distance r at some angle \( \theta \) from electric dipole is \( V = \frac{p}{4 \pi \epsilon_0 r^2} \cos(\theta) \). Substituting the values, \( V = \frac{(1.6 \times 10^{-9})}{4 \pi (8.85 \times 10^{-12}) (0.6)^2} \cdot \frac{1}{2} = 200 \) V. Hence, the correct option is (a).
Q4. Find the value of the angle of emergence from the prism if the refractive index of the glass is 3.
Answer: A
Given the refractive index of the glass, n = 3. Using Snell's law at the air-glass interface, we find the angle of emergence to be 60°.
Given the refractive index of the glass, n = 3. Using Snell's law at the air-glass interface, we find the angle of emergence to be 60°.
Q5. For a parallel beam of monochromatic light of wavelength ‘λ’ diffraction is produced by a single slit whose width ‘a’ is of the order of the wavelength of the light. If ‘D’ is the distance of the screen from the slit, the width of the central maxima will be?
Answer: A
For the condition of maxima, \( sin \theta = \frac{λ}{a} \). From the geometry, \( sin \theta \approx \theta \) (for small angle), so \( Y = \frac{D}{a} \cdot λ \). Hence, the width of central maxima is \( 2Y = 2 \frac{D}{a} λ \).
For the condition of maxima, \( sin \theta = \frac{λ}{a} \). From the geometry, \( sin \theta \approx \theta \) (for small angle), so \( Y = \frac{D}{a} \cdot λ \). Hence, the width of central maxima is \( 2Y = 2 \frac{D}{a} λ \).
Chemistry
Q6. Which one of the following characteristics of the transition metals is associated with their catalytic activity?
Answer: B
The catalytic activity of transitional metals is due to their variable oxidation states, allowing them to participate in different types of chemical reactions.
The catalytic activity of transitional metals is due to their variable oxidation states, allowing them to participate in different types of chemical reactions.
Q7. Which of the following is never true for cathode rays?
Answer: B
Cathode rays are not electromagnetic waves because they do not have electric and magnetic components perpendicular to each other.
Cathode rays are not electromagnetic waves because they do not have electric and magnetic components perpendicular to each other.
Q8. Mark the incorrect statement in the following:
Answer: B
The correct answer is (b) because when a diatomic molecule loses an electron, its bond order may increase or decrease, so its bond energy may also decrease or increase and is not guaranteed to always increase.
The correct answer is (b) because when a diatomic molecule loses an electron, its bond order may increase or decrease, so its bond energy may also decrease or increase and is not guaranteed to always increase.
Q9. The vapour pressure of benzene at a certain temperature is 640 mmHg. A non-volatile and non-electrolyte solid, weighing 2.175 g is added to 39.08 g of benzene. If the vapour pressure of the solution is 600 mm Hg, what is the molecular weight of solid substance?
Answer: C
According to Raoult’s law, \( \frac{p^\circ - p}{p^\circ} = \frac{m}{M} \) where \( p^\circ \) is the vapour pressure of pure benzene, \( p \) is the vapour pressure of the solution, \( m \) is the mass of solute, and \( M \) is the molecular weight of the solute. Using the values: \( p^\circ = 640 \text{ mmHg}, p = 600 \text{ mmHg}, m = 2.175 \text{ g}, W = 39.08 \text{ g} \), we find that the molecular weight of the solid substance is approximately 69.40 g/mol.
According to Raoult’s law, \( \frac{p^\circ - p}{p^\circ} = \frac{m}{M} \) where \( p^\circ \) is the vapour pressure of pure benzene, \( p \) is the vapour pressure of the solution, \( m \) is the mass of solute, and \( M \) is the molecular weight of the solute. Using the values: \( p^\circ = 640 \text{ mmHg}, p = 600 \text{ mmHg}, m = 2.175 \text{ g}, W = 39.08 \text{ g} \), we find that the molecular weight of the solid substance is approximately 69.40 g/mol.
Q10. The best method for the separation of naphthalene and benzoic acid from their mixture is
Answer: D
The best method for separating naphthalene and benzoic acid is sublimation, as it applies to organic compounds that transition directly from solid to vapor on heating. Naphthalene is volatile while benzoic acid is non-volatile due to dimer formation via hydrogen bonding, making sublimation effective for this separation.
The best method for separating naphthalene and benzoic acid is sublimation, as it applies to organic compounds that transition directly from solid to vapor on heating. Naphthalene is volatile while benzoic acid is non-volatile due to dimer formation via hydrogen bonding, making sublimation effective for this separation.
Biology
Q11. During DNA replication, the strands separate by
Answer: C
The enzyme helicase is responsible for unwinding the DNA helix, allowing the strands to separate during replication.
The enzyme helicase is responsible for unwinding the DNA helix, allowing the strands to separate during replication.
Q12. Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.
Answer: C
Typhoid fever is caused by the bacterium Salmonella typhi and the Widal test is the confirmatory test for typhoid, which is based on antigen-antibody reaction. Typhoid fever or enteric fever has an incubation period of 1 to 2 weeks and it is usually transmitted through contaminated food and water.
Typhoid fever is caused by the bacterium Salmonella typhi and the Widal test is the confirmatory test for typhoid, which is based on antigen-antibody reaction. Typhoid fever or enteric fever has an incubation period of 1 to 2 weeks and it is usually transmitted through contaminated food and water.
Q13. Chronic autoimmune disorder affecting neuromuscular junction leading to fatigue, weakening and paralysis of skeletal muscle is called as?
Answer: C
Myasthenia gravis is defined as an autoimmune neuromuscular disorder that leads to fluctuating muscle weakness and fatigue. The cause of this disease is circulating antibodies that block acetylcholine receptors at the post-synaptic neuromuscular junctions. Other options are incorrect as muscular dystrophy is characterized by progressive degeneration of muscle fibers, gout is related to uric acid accumulation, and arthritis involves joint swelling and tenderness.
Myasthenia gravis is defined as an autoimmune neuromuscular disorder that leads to fluctuating muscle weakness and fatigue. The cause of this disease is circulating antibodies that block acetylcholine receptors at the post-synaptic neuromuscular junctions. Other options are incorrect as muscular dystrophy is characterized by progressive degeneration of muscle fibers, gout is related to uric acid accumulation, and arthritis involves joint swelling and tenderness.
Q14. During sewage treatment, biogases are produced, which include:
Answer: A
Biogas produced during sewage treatment primarily consists of methane, hydrogen sulphide, and carbon dioxide. This mixture is mainly generated through the activity of bacteria called methanogens.
Biogas produced during sewage treatment primarily consists of methane, hydrogen sulphide, and carbon dioxide. This mixture is mainly generated through the activity of bacteria called methanogens.
Q15. The most striking example of point mutation is found in a disease called?
Answer: D
Sickle-cell anaemia is an example of point mutation. It is a genetic disease reported from negroes due to a molecular mutation of gene Hb A on chromosome 11 which produces β-chain of adult haemoglobin. In this disease nucleotide triplet CTC is changed to CAC, these changes take place at a particular point of chromosome, so they are called as point mutation.
Sickle-cell anaemia is an example of point mutation. It is a genetic disease reported from negroes due to a molecular mutation of gene Hb A on chromosome 11 which produces β-chain of adult haemoglobin. In this disease nucleotide triplet CTC is changed to CAC, these changes take place at a particular point of chromosome, so they are called as point mutation.
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