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Sample Mock Test NEET
15 questions · Physics, Chemistry, Biology · tap an option to check your answer
Physics
Q1. In p-type semiconductor, the majority charge carriers are
Answer: A
Semiconductors doped with acceptor atoms are called p-type semiconductors, where holes act as majority carriers due to their larger number compared to electrons in the conduction band.
Semiconductors doped with acceptor atoms are called p-type semiconductors, where holes act as majority carriers due to their larger number compared to electrons in the conduction band.
Q2. A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at a distance of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is:
Answer: A
The intensity of sound I is inversely proportional to the square of the distance from the source. Thus, I ∝ 1/r^2. The ratio of intensities at points P and Q is I_P/I_Q = (r_Q^2)/(r_P^2) = (3^2)/(2^2) = 9/4. Hence, the correct answer is option (a).
The intensity of sound I is inversely proportional to the square of the distance from the source. Thus, I ∝ 1/r^2. The ratio of intensities at points P and Q is I_P/I_Q = (r_Q^2)/(r_P^2) = (3^2)/(2^2) = 9/4. Hence, the correct answer is option (a).
Q3. The moment of inertia of a uniform circular disc of radius R and mass M about an axis passing from the edge of the disc and normal to the disc is
Answer: D
Using the parallel axis theorem, the moment of inertia about an axis through the center is \( \frac{1}{2}MR^2 \), and then applying the theorem gives \( I = \frac{3}{2}MR^2 \) for the edge axis.
Using the parallel axis theorem, the moment of inertia about an axis through the center is \( \frac{1}{2}MR^2 \), and then applying the theorem gives \( I = \frac{3}{2}MR^2 \) for the edge axis.
Q4. The number of photons emitted, on the average, by a laser producing monochromatic light of frequency 6.0×10^14 Hz and power 2×10^−3 W is
Answer: A
Power emitted, \( P = 2 \times 10^{-3} \text{ W} \). The energy of one photon is given by \( E = h \nu = 6.6 \times 10^{-34} \times 6.0 \times 10^{14} \). The number of photons emitted per second is given by \( n = \frac{P}{E} = \frac{2 \times 10^{-3}}{6.6 \times 10^{-34} \times 6.0 \times 10^{14}} = 5 \times 10^{15} \).
Power emitted, \( P = 2 \times 10^{-3} \text{ W} \). The energy of one photon is given by \( E = h \nu = 6.6 \times 10^{-34} \times 6.0 \times 10^{14} \). The number of photons emitted per second is given by \( n = \frac{P}{E} = \frac{2 \times 10^{-3}}{6.6 \times 10^{-34} \times 6.0 \times 10^{14}} = 5 \times 10^{15} \).
Q5. A particle executes simple harmonic oscillation with an amplitude a. The period of oscillation is T. The minimum time taken by the particle to travel half of the amplitude from the equilibrium position is?
Answer: C
Let the displacement equation of the particle executing SHM be x = a sin(ωt). For the particle to travel half of the amplitude from the equilibrium position, we set x = a/2. Solving the equation gives t = T/12.
Let the displacement equation of the particle executing SHM be x = a sin(ωt). For the particle to travel half of the amplitude from the equilibrium position, we set x = a/2. Solving the equation gives t = T/12.
Chemistry
Q6. What is the chemical formula for water?
Answer: A
Water is composed of two hydrogen atoms and one oxygen atom. Hence, its chemical formula is H2O.
Water is composed of two hydrogen atoms and one oxygen atom. Hence, its chemical formula is H2O.
Q7. Which of the following types of forces bind together the carbon atoms in diamond?
Answer: B
In diamond, each carbon atom undergoes sp³ hybridisation and is covalently bonded to three other carbon atoms by single bonds.
In diamond, each carbon atom undergoes sp³ hybridisation and is covalently bonded to three other carbon atoms by single bonds.
Q8. Which of the following acid will form an (i) anhydride on heating and (ii) acid imide on strong heating with ammonia?
Answer: B
An αβ-dicarboxylic acid with same-side (syn) orientation of —COOH group is able to form anhydride (cyclic) and imide (cyclic). Among isomeric benzene dicarboxylic acids, only benzene-1,2-dicarboxylic acid (phthalic acid) will respond to the below reactions.
An αβ-dicarboxylic acid with same-side (syn) orientation of —COOH group is able to form anhydride (cyclic) and imide (cyclic). Among isomeric benzene dicarboxylic acids, only benzene-1,2-dicarboxylic acid (phthalic acid) will respond to the below reactions.
Q9. In which of the following molecules/ions the central atom is sp² hybridised?
Answer: D
BF₃ has 3σ-bonds, which corresponds to sp² hybridisation, and NO₂⁻ has 2σ-bonds and 1 lone pair, also corresponding to sp² hybridisation. Thus, the correct answer is BF₃ and NO₂⁻.
BF₃ has 3σ-bonds, which corresponds to sp² hybridisation, and NO₂⁻ has 2σ-bonds and 1 lone pair, also corresponding to sp² hybridisation. Thus, the correct answer is BF₃ and NO₂⁻.
Q10. What is the chemical formula for water?
Answer: A
Water, a vital substance for all known forms of life, has the chemical formula H2O. This means each molecule of water consists of two hydrogen atoms covalently bonded to one oxygen atom. The significance of water in biological and chemical processes cannot be overstated, as it acts as a solvent, a reactant, and a product in various reactions.
Water, a vital substance for all known forms of life, has the chemical formula H2O. This means each molecule of water consists of two hydrogen atoms covalently bonded to one oxygen atom. The significance of water in biological and chemical processes cannot be overstated, as it acts as a solvent, a reactant, and a product in various reactions.
Biology
Q11. Which of the following statements is true?
Answer: A
The correct answer is (a) Vessels are multicellular with narrow lumen. Each vessel consists of a number of components called 'vessel members' arranged end-to-end, running parallel to the long axis of the organ.
The correct answer is (a) Vessels are multicellular with narrow lumen. Each vessel consists of a number of components called 'vessel members' arranged end-to-end, running parallel to the long axis of the organ.
Q12. Which statement is correct about the centre of origin of plants?
Answer: A
The centres of origin of plants are more appropriately called the centres of diversity. These are the areas of maximum diversity of these species.
The centres of origin of plants are more appropriately called the centres of diversity. These are the areas of maximum diversity of these species.
Q13. “Ramachandran plot” is used to confirm the structure of.
Answer: B
‘Ramachandran plot’ is used to confirm the structure of proteins. Ramachandran plot is a plot of the angles-phi (\(\phi\)) and psi (\(\psi\)) of amino acids found in a peptide chain. This plot was developed by GN Ramachandran, an Indian Scientist in 1963.
‘Ramachandran plot’ is used to confirm the structure of proteins. Ramachandran plot is a plot of the angles-phi (\(\phi\)) and psi (\(\psi\)) of amino acids found in a peptide chain. This plot was developed by GN Ramachandran, an Indian Scientist in 1963.
Q14. Evolutionary convergence is development of
Answer: A
Convergent evolution or adaptive convergence refers to the development of similar adaptive functional structures in unrelated groups of organisms, such as the wings of insects, birds, and bats.
Convergent evolution or adaptive convergence refers to the development of similar adaptive functional structures in unrelated groups of organisms, such as the wings of insects, birds, and bats.
Q15. Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom
Answer: A
All single-celled eukaryotic organisms such as chrysophytes, euglenoids, dinoflagellates, and slime moulds are classified under the kingdom Protista. This kingdom encompasses a diverse range of microorganisms that are predominantly unicellular.
All single-celled eukaryotic organisms such as chrysophytes, euglenoids, dinoflagellates, and slime moulds are classified under the kingdom Protista. This kingdom encompasses a diverse range of microorganisms that are predominantly unicellular.
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