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KHAN ACADEMY
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MDCAT PRACTICE TEST
1. Total No of Question 200 3. No Negative marking each question carry 1 mark
2. Total Marks 200 4. Time duration to attempt the paper shall be 210 Minutes
Biology: 81 MCQs Chemistry:45 MCQs Physics:36 MCQs English: 9 MCQs Logical.R: 9 MCQs
NOTE: THERE ARE 180 QUESTIONS, PRINTED ON 08 PAGES, PLEASE CHECK ALL PAGES BEFORE
ATTEMPTED THE PAPER
BIOLOGY 11. (c) Flagella
Explanation: Flagella is an independent
KHAN ACADEMY
structure which is not linked to active mass
1. (c) Cellulose movement of cytoplasm.
Explanation: Cellulose is used for a variety
12. (a) Translation
of industrial purposes in making OR
Explanation: As rough endoplasmic
processing of explosives, textiles, dialysis
reticulum has the role of protein synthesis
membrane, plastic papers and
(translation in specific).
cinematography.
13. (c) Lipid synthesis
2. (b) Flexibility
Explanation: R.E.R is rough due to
Explanation: Lignification refers to the
attachment of ribosomes and because of these
process by which lignin, a complex organic
ribosomes it is involved in protein synthesis.
polymer, is deposited in the cell walls of
certain plant cells. 14. (d) Sedimentation
Explanation: Performing repeatedly
3. (d) Fiber
centrifugation sediments of 80s, 70s
Explanation: Macrofibrils (i.e., having
ribosomes and their subunit are sedimented
diameter in micrometers) of cellulose are seen
and distinguished.
in cell wall of plant cells.
15. (b) R.E.R
4. (a) Golgi bodies
Explanation: Vesicles that pinch of from
Explanation: As polysaccharide synthesis
R.E.R flow converge and fuse to form Golgi
and increasing surface area of cell wall are
cisterna.
roles of Golgi application, So, mainly
components of cell wall are secreted by Golgi 16. (d) Mechanical support
bodies. Explanation: All given are functions of Golgi
bodies except the mechanical support which is
5. (c) Outermost
role of endoplasmic reticulum.
Explanation: The primary wall is outermost
true and first layer of cell wall, while all other 17. (b) Phagocyte
properties of cell wall are specific to Explanation: All given options tell about the
secondary wall. roles of lysosomes while phagocytes are
macrophages i.e., a complete cell, not an
6. (b) Globular proteins
organelle.
Explanation: 60-80% of cell membrane is
comprised of globular or 3d – proteins, 18. (c) Importing color to fruits and flower
moreover tertiary or quaternary confirmation 19. (b) ATP synthesis
of proteins show globular nature. Explanation: Both glycogenesis and Tay-
7. (b) Sheet sach’s disease are congenital disease as well –
Explanation: Extrinsic proteins lie on outer known as lysosomal storage diseases (LSDs),
surface and placed among phospholipids; while it has no direct relation with ATP
some extend from one end to other end like synthesis.
transmembrane proteins while they are not in 20. (b) Lysosomal malfunction
the form of sheets. Explanation: Both words lysosomes and
8. (b) All of these phagosomes are same in function but don’t
Explanation: All 3 previous models about show an abnormal activity. So, given
plasma membrane were limited in details and condition is only observed due to lysosomal
unaccepted now a days because of detailed malfunction.
model representation by fluid Mosaic model. 21. (a) Erythroblast
9. (a) Ribosome Explanation: Erythroblasts are immature,
while, erythrocytes are mature RBCs hence
10. (b) Prokaryote
they lack mitochondria and nucleus.
Explanation: Eukaryotic cell shows
compartmentalization and division of labor, 22. (d) All of these
while in prokaryotic cell all such functions if Explanation:
occur are carried out in its cytoplasm.
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23. (d) All of these 38. (a) Lysosomes

Explanation: Explanation: Lysosomes are membrane-
24. (a) Chloroplasts bound organelles found in animal cells that
Explanation: Only plastids and vacuoles in contain digestive enzymes. They are
cell possess pigments among plants, hence responsible for breaking down waste
chloroplast are seen as heterogenous structure materials, cellular debris, and foreign
with grana or granules. substances.
25. (b) Stroma 39. (b) In the interior of the membrane
Explanation: Stroma is the site for dark Explanation: A phospholipid molecule is a
reaction where CO2 is fixed by Rubisco for key component of the cell membrane, forming
sugar synthesis. the phospholipid bilayer.
26. (c) One or more 40. (d) Prokaryotic cells do not have a
Explanation: Number of nucleoli as well membrane bounded nucleus but eukaryotic
nuclei in cell can be one, two or more, both cells do have such a nucleus
for nucleus and cell respectively. Explanation: The key difference between
27. (d) Chromatin prokaryotic and eukaryotic cells lies in their
Explanation: Chromosomes as threads are nuclear structure:
clearly observed when they coil and condense Prokaryotic cells (e.g., bacteria and archaea)
during cell division while, uncoiled and lack a true nucleus. Their genetic material is
uncondensed form is chromatin. located in a region called the nucleoid, which
28. (b) Short chain amino acids is not surrounded by a membrane.
Explanation: Murein as peptide (Amino acid) Eukaryotic cells (e.g., plants, animals, fungi,
– glycan (Carbohydrate) complex has protists) have a well-defined, membrane-
polysaccharides covalently bonded to shorter bounded nucleus where the DNA is enclosed.
chain amino acids. 41. (c) Mitochondria
29. (c) Sarcoplasmic reticulum Explanation:
Explanation: All other options are 42. (b) Phagocytosis
organelle/structures restricted plants while Explanation: Endocytosis is the process by
sarcoplasmic reticulum is found in amino which cells engulf external substances by
acids. folding their membrane around the material to
30. (c) Vacuole bring it inside.
Explanation: Vacuoles mostly store 43. (c) Calcium and magnesium pectate
substances like food, water, wastes etc, and Explanation: The middle lamella is the
not involved in any synthesis itself directly. outermost layer found between the primary
31. (b) Its rigid cell walls of adjacent plant cells. It acts as a
Explanation: Hence plasma membrane is a cementing layer, helping to hold cells together
fluid floating structure it is never a rigid in plant tissues.
structure. The main component of the middle lamella is
32. (d) Glycogen pectin, specifically in the form of calcium and
Explanation: As glycogen is animal starch or magnesium pectates.
polysaccharide reserve, it cannot be seen in These pectates form a gel-like structure that
plant cytoplasm. provides adhesion and flexibility between
33. (a) Roots plant cells.
Explanation: Chromoplasts mainly give 44. (a) Chloroplast
color i.e., other than green, helping in Explanation: In autotrophic eukaryotes (like
pollination as well providing variety of colors. plants and algae), the chloroplast is the
34. (a) Nucleic acids organelle responsible for photosynthesis, the
Explanation: Nucleic acids are part of process by which sugars (like glucose) are
hereditary material, other essential synthesized using light energy.
compounds like ATP and coenzymes hence 45. (c) Lysosomes
they are not stored, moreover all other Explanation: Lysosomes are membrane-
biomolecules are stored in leucoplasts. bound organelles found mainly in animal
35. (c) Ribosomes and mitochondria cells, and their primary function is to store
Explanation: Protein synthesis primarily and use hydrolytic enzymes to break down.
occurs in ribosomes, located in the cytoplasm 46. (d) Golgi bodies (Of plant cells)
of both prokaryotic and eukaryotic cells. Explanation: Dictyosomes are flattened,
36. (a) Mitochondria membrane-bound sacs that are part of the
Explanation: The power house of the cell Golgi apparatus, also known as Golgi bodies.
is the mitochondrion (plural: mitochondria). 47. (c) Golgi bodies
37. (b) Inner nuclear membrane Explanation: The endoplasmic reticulum
Explanation: (ER) and Golgi apparatus are the main
organelles involved in the modification and
routing of newly synthesized proteins. The ER
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plays a crucial role in protein synthesis and Calcium storage in muscle cells.
lipid metabolism. Proteins are synthesized on 55. (c) Chloroplast
ribosomes associated with the ER, and then Explanation: Chloroplasts are organelles
modified within the ER lumen. The Golgi found only in plant cells and some algae,
apparatus further processes and sorts these where they carry out photosynthesis —
proteins before they are transported to their converting light energy into chemical energy
final destinations. (glucose).
48. (a) Ribosomes Animal cells do not have chloroplasts
Explanation: "Palade granules" are another because they obtain energy by consuming
name for ribosomes. These are cellular organic material, not by photosynthesis.
structures responsible for protein 56. (d) All of the above
synthesis. George E. Palade discovered these Explanation: Vacuole, Golgi apparatus, and
granules in 1955, and they are now commonly Endoplasmic reticulum (ER) are all single
known as ribosomes. membrane-bound organelles. This means each
49. (c) Cell membrane is enclosed by a single lipid bilayer membrane
Explanation: The cell membrane, also called separating its internal contents from the
the plasma membrane, acts as a selective cytoplasm.
barrier, controlling which substances can Vacuole: A storage organelle, especially large
enter or leave the cell, thus maintaining its in plant cells, enclosed by a single membrane
internal environment. called the tonoplast.
50. (c) Secondary wall Golgi Apparatus: Involved in modification,
Explanation: In plant cells, the secondary sorting, and packaging of proteins and lipids,
cell wall is located closest to the plasma surrounded by a single membrane.
membrane. The primary cell wall forms first, Endoplasmic Reticulum (ER): A network of
but after the cell reaches its mature size, a membranous tubules and sacs involved in
secondary cell wall may be deposited between protein (rough ER) and lipid (smooth ER)
the plasma membrane and the existing synthesis; it is enclosed by a single
primary cell wall. This secondary wall membrane.
provides additional structural support and 57. (d) Mitochondria
rigidity to the cell. Explanation: Lysosomes contain digestive
51. (b) Decreases enzymes that break down various biological
Explanation: At high temperatures, cell polymers like proteins, nucleic acids,
membranes become more fluid. This carbohydrates, and lipids, essentially acting as
increased fluidity is due to the greater kinetic the "garbage disposal" of the cell.
energy of the phospholipid molecules, causing 58. (c) Endoplasmic Reticulum
them to move more freely within the Explanation:
membrane. This increased movement can 59. (c) Release of calcium ions from muscle
affect membrane permeability and the contractions
function of membrane-bound proteins. Explanation: The sarcoplasmic reticulum is
52. (d) The cell wall is mainly composed of primarily associated with calcium storage and
cellulose muscle contraction. It is a specialized form
Explanation: The cell wall is a rigid, of endoplasmic reticulum found in muscle
protective outer layer found in plant cells, cells, acting as a calcium reservoir. When a
fungi, and some prokaryotes (like bacteria). In muscle needs to contract, the sarcoplasmic
plant cells, the primary component of the cell reticulum releases stored calcium ions into the
wall is cellulose. cytoplasm, triggering the contraction process.
53. (b) Cell Biology 60. (a) Always faces outwards, towards
Explanation: Cell Biology (also called extracellular space
cytology) is the branch of biology that deals Explanation: In the plasma membrane,
specifically with the study of cells — their carbohydrates are mostly found attached to
types, structures, functions, and organelles. lipids (glycolipids) or proteins (glycoproteins)
It involves understanding how cells operate, on the outer (extracellular) surface of the
communicate, reproduce, and contribute to the membrane.
life of organisms. These carbohydrate chains face outwards into
54. (d) Smooth Endoplasmic Reticulum the extracellular environment, where they
Explanation: The Smooth Endoplasmic play important roles in:
Reticulum (Smooth ER) is a type of Cell recognition
endoplasmic reticulum that lacks ribosomes Cell signaling
on its surface and is primarily involved in: Protection
Lipid synthesis, including the synthesis of Adhesion
phospholipids which are essential components Carbohydrates do not face inward into the
of cell membranes. cytoplasm or the nonpolar (hydrophobic)
Detoxification of harmful substances.
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interior of the membrane because they are 66. (b) Telocentric chromosome
hydrophilic (water-attracting). Explanation: A telocentric chromosome has
61. (a) Chromatin its centromere located at the very end (tip) of
Explanation: The nuclear matrix is a the chromosome. This results in the
network of fibrous proteins found inside the chromosome having essentially only one arm.
nucleus, providing structural support and This configuration means the chromosome
organizing the contents of the nucleus. looks like a rod with the centromere at the tip.
Chromatin, which consists of DNA and 67. (b) 23
associated proteins (mainly histones), is a Explanation: An oocyte is a female gamete
major constituent of the nucleus and is (egg cell).
embedded in the nuclear matrix. Gametes are haploid cells, meaning they
Chromatin contains the genetic material and contain half the number of chromosomes
is responsible for regulating gene expression compared to somatic (body) cells.
and DNA replication. In humans, the diploid number (total
62. (b) Nucleolus chromosomes in somatic cells) is 46.
Explanation: The nucleolus is a dense region Therefore, an oocyte contains 23
found inside the nucleus of eukaryotic cells. chromosomes (haploid number), so that upon
It is the primary site of ribosomal RNA fertilization with a sperm (also 23
(rRNA) synthesis and the assembly of chromosomes), the zygote will have the
ribosomal subunits. normal diploid number of 46.
rRNA genes are transcribed in the nucleolus, 68. (a) Kinetochores
and the rRNA molecules combine with Explanation: Kinetochores are protein
proteins to form the small and large subunits complexes that form as disc-shaped
of ribosomes. structures on the surface of the centromere
63. (c) Nucleolus region of a chromosome.
Explanation: The nucleolus is a dense, non- They serve as the attachment sites for
membrane-bound structure inside the nucleus. spindle fibers (microtubules) during mitosis
It is primarily involved in ribosomal RNA and meiosis, facilitating the proper
(rRNA) synthesis and ribosome assembly. segregation of chromosomes.
Unlike organelles such as mitochondria, Kinetochores play a crucial role in
endoplasmic reticulum, and lysosomes, which chromosome movement and alignment during
are surrounded by membranes, the nucleolus cell division.
does not have a membrane separating it 69. (c) Waste digestion
from the nucleoplasm. Explanation: The ER is involved in protein
64. (a) Centromere and lipid synthesis, and it also plays a role in
Explanation: The centromere is the primary calcium storage, but not in waste digestion.
constriction on a chromosome visible under a Waster digestion is primarily the function of
microscope during cell division. lysosomes.
It is the region where the two sister 70. (a) Rough ER has ribosomes, while smooth
chromatids are held together and where the ER does not.
kinetochore forms. Explanation: Rough Endoplasmic Reticulum
The centromere plays a crucial role during (Rough ER) has ribosomes attached to its
mitosis and meiosis, serving as the attachment surface, giving it a "rough" appearance under
site for spindle fibers that pull chromatids a microscope. These ribosomes are the sites of
apart. protein synthesis.
65. (d) Metacentric chromosome Smooth Endoplasmic Reticulum (Smooth ER)
Explanation: Chromosomes are classified lacks ribosomes on its surface and is involved
based on the position of their centromere, primarily in lipid synthesis, detoxification,
which divides the chromosome into two arms: and calcium storage.
Metacentric chromosome: The centromere is 71. (b) Smooth ER
located in the middle, producing two equal Explanation: Smooth ER is the primary site
arms (p and q arms are roughly the same for lipid and steroid hormone synthesis.
length). 72. (a) Lumen
Sub-metacentric chromosome: The Explanation: The ER lumen is the space
centromere is off-center, creating one arm enclosed by the ER membrane.
longer than the other. 73. (d) Both b and c
Acrocentric chromosome: The centromere is Explanation: The smooth endoplasmic
very close to one end, resulting in a very reticulum (Smooth ER) is involved in several
short (or satellite) arm and a long arm. key functions, including:
Telocentric chromosome: The centromere is Lipid synthesis: It synthesizes phospholipids
at the very end of the chromosome, so there and steroids necessary for membrane
is essentially only one arm visible. formation and hormone production.

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Detoxification: Smooth ER helps detoxify KHAN ACADEMY

drugs, poisons, and metabolic waste products, 82. (c) CH4
especially in liver cells. Explanation: Methane has molecular and
74. (b) Nucleus empirical formula identical
Explanation: The ER membrane is directly 83. (b) Composition of substance
connected to the outer membrane of the Explanation: Composition is shown by
nuclear envelope. chemical formula
75. (c) Calcium ion storage and release 84. (c) Avogadro’s number
Explanation: The sarcoplasmic reticulum, a Explanation: Avogadro number is the
specialized from of ER found in muscle cells, number of particles in one mole of a
is crucial for regulating calcium levels during substance
muscle contraction. 85. (c) 12g
76. (c) Camillo Golgi Explanation: n=N/NA and n=m/M
Explanation: Camillo Golgi was an Italian 86. (d) 0.01 x 1023
physician who first discovered Golgi Explanation: N = n x NA
complex, which is a single membrane bound n = m/M
organelle. It consists of five eight membrane 87. (c) 88/78
bound sacs called cisternae. Explanation: n = m/M
77. (d) Golgi apparatus d = m/v and m = d x v
Explanation: Golgi apparatus is prominent in 88. (a) 16g
cells that are specialized for secretion like Explanation: 1 g – atom atomic mass
goblet cell of intestinal epithelium secrete a 89. (c) 0.1 mol of S
large amount of mucus. Cell secretion takes Explanation: 56g Fe = 1 mol
place from trans Golgi through exocytosis. 32g S = 1 mol
78. (b) Golgi apparatus So, 5.6g Fe = 0.1 mol S
Explanation: Golgi apparatus modifies and 90. (c) 22.4 liters of water at STP
transport proteins and lipids that have been Explanation: A mole is defined as:
built in the endoplasmic reticulum to the 6.022×1023 entities (Avogadro's number NA)
outside of the cell or to other locations in the of a substance.
cell. The molar mass of a substance in grams (e.g.,
79. (d) Amino acid metabolism 44 g of CO₂ is 1 mole because its molar mass
Explanation: Golgi apparatus involves the = 44 g/mol).
metabolism of carbohydrates, and lipids, but 22.4 liters of a gas at STP (Standard
not of amino acid, so, amino acid metabolism Temperature and Pressure) equals 1 mole of
is incorrect. Synthesis of glycolipids and gas, not liquid or solid.
sorting of glycoprotein also takes place in 91. (b) Theoretical yield
Golgi apparatus. Explanation: The amount of product
80. (a) 22 pairs of autosomes and 1 pair of sex calculated from a balance chemical equation
chromosomes is called theoretical yield.
Explanation: Humans have a total of 46 92. (c) Acetic acid
chromosomes arranged in 23 pairs. Explanation: Both have same empirical
Out of these 23 pairs: formula
22 pairs are autosomes (non-sex 93. (b) 5 NA
chromosomes). Explanation: 1 mol carbonic acid = 62 g = 5
1 pair is the sex chromosomes (XX in NA sigma bonds
females, XY in males). So, 31g = 0.5 mol = 2.5NA
This combination determines the genetic 94. (b) Limiting reactant
makeup and sex of the individual. Explanation: Limiting reagent produces the
81. (c) Mitochondria least amount of product.
Explanation: The nucleus is a membrane- 95. (b) 50%
bound organelle that contains: Explanation: Efficiency of reaction =
Nuclear envelope: Double membrane percentage yield
surrounding the nucleus. % yield – 28 Actual yield / 56 theoretical
Nucleolus: Dense region involved in yield.
ribosomal RNA synthesis.
96. (c) 28g
Chromatin: DNA-protein complex
Explanation: Theoretical yield is calculated
containing genetic material.
on the basis of balanced chemical equation
Mitochondria are separate organelles
CaCO3 → CaO + CO2
located in the cytoplasm and are not part of
1 mol = 1 mol
the nucleus. They are responsible for energy
100 g = 56 g
(ATP) production.
50 g = 28 g
CHEMISTRY
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97. (c) Both a and b 111. (b) 200g

Explanation: Product can be measured in any 𝑚𝑎𝑠𝑠 𝑜𝑓 𝑜𝑥𝑦𝑔𝑒𝑛
Explanation: 𝑚𝑜𝑙𝑎𝑟 𝑚𝑎𝑠𝑠 𝑜𝑓 𝑜𝑥𝑦𝑔𝑒𝑛 =
unit of mass, volume, etc. 𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑜𝑥𝑦𝑔𝑒𝑛
98. (a) No concept of LR & ER 24.4
Explanation: When reactants are present in 67.2
Now mass of oxygen = 22.4 x 32 => 96g
stoichiometric ratio then there is no limiting
Mass of CaCO3 containing 96g oxygen ⟹
reactant & excess reactant. 96
99. (b) CO2 x 100 ⟹ 200𝑔
48
Explanation: Micro molecule has MF and 112. (b) 44.2L of methane gas at STP
EF. Here CO2 is micro molecule. Explanation: We need to find the total
100. (c) Atom number of atoms in each option. This includes
Explanation: An atom is the smallest unit of all atoms in each molecule times the number
an element that retains its chemical properties. of molecules.
101. (c) Salt solution 113. (b) 3.32 x 10-24
Explanation: Salt solution is a mixture, not a Explanation: No. of moles of O2 =
substance. 𝑀𝑎𝑠𝑠 (𝑎𝑚𝑢) x 1.66 x 10−24
𝑀𝑜𝑙𝑎𝑟 𝑀𝑎𝑠𝑠 𝑜𝑓 𝑂2
102. (d) All are stoichiometric assumptions
Explanation: All the given statements are 114. (b) 72L
𝑀𝑎𝑠𝑠 (𝑔)𝑜𝑓 𝐶𝐻4
stoichiometric assumptions Explanation: 𝑀𝑜𝑙𝑎𝑟 𝑀𝑎𝑠𝑠 𝑜𝑓 𝐶𝐻 =
4
103. (d) None of these 𝑉𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝐶𝐻4
Explanation: The stoichiometric ratio of 24
hydrogen to oxygen is 2 : 1 115. (d) None of these
104. (d) None of these Explanation: None of the given options is a
Explanation: Gay Lussac’s Law of diatomic molecule of a compound.
combining volumes is only valid for gases. An example of a diatomic molecule that is a
105. (a) CO compound would be HCl (hydrogen chloride)
Explanation: The reactant that is consumed or CO (carbon monoxide).
earlier is the limiting reactant. 116. (a) Element
106. (b) 15 cm3 Explanation: Co is a symbol.
Explanation: CO + 1/2O2 → CO2 117. (b) Compound anions
10 cm3 = 5cm3 Explanation: Molecular anions are
O2 left = 5 cm3 negatively charged ions consisting of
CO2 formed 10 cm3 molecules (like OH⁻, NO₃⁻).
10 cm3 + 5 cm3 = 15 cm3 Compound anions typically refer to
107. (d) None of these polyatomic anions (such as sulfate SO₄²⁻,
Explanation: In the given reaction reactants phosphate PO₄³⁻), which are very common in
are given in the stoichiometric ratio therefore nature, minerals, and chemical compounds.
no limiting reactant. Compound cations are positively charged
108. (a) Percentage yield polyatomic ions (like NH₄⁺, hydronium H₃O⁺),
Explanation: Theoretical yield measures the but they are generally less abundant compared
efficiency of the reaction. to anions in natural and chemical
environments.
109. (a) Silicon dioxide
Among these, compound anions (polyatomic
Explanation: Silicon dioxide (SiO₂) is a giant
anions) are the most abundant, especially in
covalent network solid, not a discrete
minerals, salts, and biological systems.
molecule. In substances like carbon dioxide
(CO₂) and water (H₂O), molecules exist as 118. (c) BF3
individual units with specific molecular Explanation: Because BF3 is a hypovalent
formulas that describe the actual number of molecule.
atoms in each molecule. 119. (b) O2
However, silicon dioxide forms a continuous Explanation: Due to larger stoich. Moles of
3D network of silicon and oxygen atoms, with H2 and less stoich. Moles of O2.
no individual SiO₂ molecules. While SiO₂ is 120. (d) No concept of LR and ER
used to indicate the empirical formula (the Explanation: Given amounts are in stoich.
simplest ratio), it does not represent a true Ratio.
molecular formula, because you can't isolate a 121. (b) 78g
single molecule of SiO₂ from the structure. Explanation: % Element =
𝐴𝑡𝑜𝑚𝑖𝑐 𝑀𝑎𝑠𝑠 x 𝑁𝑜 𝑜𝑓 𝑎𝑡𝑜𝑚𝑠
110. (b) 6 𝑀𝑜𝑙𝑎𝑟 𝑀𝑎𝑠𝑠 𝑜𝑓 𝐶𝑜𝑚𝑝𝑜𝑢𝑛𝑑
= x 100
Explanation: No. of gram molecules of 122. (b) 30
𝑉𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝐶𝑙2
chlorine gas = Explanation: C.A. of AICl3 is Al. No of
22.4
67.2 Moles of Valence electrons of Al in 5 moles
= = 3 𝑔𝑟𝑎𝑚 𝑚𝑜𝑙𝑒𝑐𝑢𝑙𝑒𝑠 AlCl3 is 5 x 6 = 30
22.4
Now No. of gram atoms = 2 x 3 6 gram atoms
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123. ((b) Free radical 134. (c) Momentum

Explanation: A free radical is neutral and has Explanation: For any collision occurring in
unpaired electron in V-Shall and Hydroxyl an isolated system, momentum is conserved.
group (𝑂̇𝐻) has unpaired electron. The total amount of momentum of the
124. (d) MF,EF and FU collection of objects in the system is the same
Explanation: Chemical formula of Covalent before the collision as after the collision.
compound is M.F and F.U. Here ratio is 135. (b) 250m
simplest hence also E.F. Explanation: Maximum height => HMax =
1000
125. (d) No molecular mass for NaCI = 250𝑚
4
Explanation: Sodium chloride (NaCl) is an 136. (a) Weight
ionic compound, not a molecule. ∆𝑃
It forms a giant ionic lattice made up of Na⁺ Explanation: As we know that ∆𝑡 = 𝑊
and Cl⁻ ions arranged in a repeating pattern, Hence rate of change of momentum equals to
so it does not have discrete molecules. weight of the body.
Therefore, it does not have a molecular mass; 137. (a) 1N
∆𝑃 ∆𝑃
instead, we talk about its formula mass (or Explanation: 𝐹 = ∆𝑡 => 𝑚𝑎 = ∆𝑡 (1)(1) =
formula weight). ∆𝑃
The formula mass of NaCl = atomic mass of = 1𝑁
∆𝑡
Na (23 amu) + atomic mass of Cl (35.5 amu) 138. (b) Impulse
= 58.5 amu. ∆𝑃
Explanation: 𝐹 = ∆𝑡 => 𝐹 x ∆𝑡 = ∆𝑃 =
126. (b) 40 / 80 x 100
𝐴𝑌 Impulse =
Explanation: %𝑦 = 𝑇𝑌 x 100 Hence it represents change in momentum.
PHYSICS 139. (c) Acceleration
∆𝑦 ∆𝑉
KHAN ACADEMY Explanation: Slope = 𝑡𝑎𝑛𝜃 = ∆𝑥 = ∆𝑡 =
127. (a) 76o Acceleration
𝑉12 𝑠𝑖𝑛2 𝜃 𝑉12 𝑠𝑖𝑛2𝜃 140. (a) 10m/s
Explanation: 𝐻 = 𝑅 ⇒ and
4𝐻
2𝑔 2𝑔 Explanation: 𝑉𝑓 = 𝑔𝑡 = 10 x 1 sec =
𝑡𝑎𝑛𝜃 = ⇒ 𝜃 = 𝑡𝑎𝑛−1 (4) = 70𝑜 10𝑚/𝑠
𝑅
128. (a) 1 : 1 141. (a) 48km/h
𝑉12 𝑠𝑖𝑛2𝜃 2𝑉1 𝑉2 2(60)(40)
Explanation: As 𝑅 = Explanation: < 𝑉 > = 𝑉 +𝑉 = 60+40 =
𝑔 1 2
𝑉12 𝑠𝑖𝑛2(30) 2(60)(40)
Range with 𝜃 = 30 ⇒ 𝑅30 = 𝑜
= = 48𝑘𝑚/ℎ
𝑔 100

𝑉12 𝑠𝑖𝑛60 3 𝑉12

142. (d) Position vector
= √2 Explanation: Only position vector will be
𝑔 𝑔
𝑉12 𝑠𝑖𝑛2(60) changes.
Range with 𝜃 = 60𝑜 ⇒ 𝑅60 = = 143. (a) 5m
𝑔
𝑉12 𝑠𝑖𝑛120𝑜 3 𝑉12 Explanation: 𝑆 = 𝑆1 + 𝑆2 = 3 + 2 = 5𝑚
= √2 144. (b) 4m towards north
𝑔 𝑔
Range will be same for two angles whose sum Explanation: 𝑑⃗ = 𝑑⃗2 = 10 − 6 = 4𝑚
is 90. 145. (c) Impulse
129. (d) All of these Explanation: Impulse = ∆𝑃 𝑉 = 𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡
𝑉12 𝑠𝑖𝑛2𝜃 Impulse = 0 𝑃 = 𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡 => ∆𝑃 = 0
Explanation: As 𝑅 = , so the range of
𝑔
146. (d) 0
projectile depends upon V1, 𝜃 and g. Explanation: In one vibration total
130. (a) Acceleration displacement will be zero → Closed path
Explanation: The vertical motion of a
147. (c) Impulse
particle during its free fall. Here the
Explanation: Impulse = 𝐹 x ∆𝑡 = 𝑁. 𝑆𝑒𝑐
acceleration is constant, being equal to g or a.
148. (d) 20 cm
131. (b) 300%
Explanation:
Explanation: %∆𝐻 = (𝐻1 − 𝐻) x 100 =
149. (b) 1 : 3
(4 − 1) x 100 = 300%
Explanation: Slope = 𝑡𝑎𝑛𝜃 𝑆𝑙𝑜𝑝𝑒 = 𝑉
132. (a) 50m 𝑉𝐴 𝑡𝑎𝑛30
Explanation: Range of projectile at 15o => 𝑉 ∝ 𝑡𝑎𝑛𝜃 = = 1∶3
𝑅𝑀𝑎𝑥 100 𝑉𝐵 𝑡𝑎𝑛60
𝑅15𝑜 = 2 = 2 = 50𝑚 150. (b) 20cm
𝟖𝑯
133. (c) 𝑻 = 𝟐 Explanation:
𝒈
𝑉12 𝑠𝑖𝑛2 𝜃 2𝑉1 𝑠𝑖𝑛𝜃
151. (c) 25m/s
Explanation: 𝐻 = ,𝑇 = = 𝑉 +𝑉 20+30
Explanation: < 𝑉 > = 1 2 2 = 2 = 2 =
50
2𝑔 𝑔
2 4𝑉12 𝑠𝑖𝑛2 𝜃 8𝐻
𝑇 = = 25𝑚/𝑠
𝑔2 𝑔

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152. (a) Momentum unfocused, partial reading, often due to digital

Explanation: The product of mass and interruptions.
velocity is called Momentum 𝑃 = 𝑚𝑉 168. (c) Looking at the context of the sentence
153. (a) Impulse Explanation: Context cluses help readers
Explanation: Impulse = 𝐹 x ∆𝑡 => 𝐹 = ∆𝑡
1 infer meaning without external help
On swinging his hands backward, he increases 169. (c) To provoke thought or emphasize a
the time in which the velocity of the ball will point
become zero. This decreases the rate of Explanation: Rhetorical questions are used to
change of momentum and thus reduces the make readers think, not a get answers.
force acting on the fielder’s hand. This avoids 170. (c) A conclusion draw from evidence
the chances of hurting hands. Explanation: Inferences are logical
154. (d) Change in velocity conclusions based on evidence and reasoning.
∆𝑉 171. (c) Comprehend the text more effectively
Explanation: 𝐴 = 𝐿 x 𝜔 𝑎 = ∆𝑡 So, ∆𝑉 = Explanation: Knowing the author’s intent
𝑎 x ∆t improves understanding and interpretation.
155. (a) 1 : 1 LOGICAL RESONING
Explanation: Acceleration is independent of
KHAN ACADEMY
mass of a body. So, final velocity is same.
172. (d) Some flowers that fade quickly may not
156. (b) 20o,70o
be roses
Explanation: The angle whose sum is 90 =>
Explanation: Not all flowers are roses, so
20o + 70o = 90o
flowers that fade quickly may or may not be
157. (a) 0o
roses.
Explanation: The velocity increasing the
173. (c) There is a fire or heat source producing
acceleration is positive so, 𝜃 = 0.
smoke
158. (a) 10N
∆𝑃 100 Explanation: Smoke usually indicates the
Explanation: 𝐹 = ∆𝑡 = 10 = 10𝑁 presence of fire or heat, but it doesn’t confirm
159. (a) 5sec the exact cause.
∆𝑃 𝑃 𝑚𝑉
Explanation: 𝐹 = ∆𝑡 => ∆𝑡 = 1𝐹 = 1𝐹 = 174. (c) You drop a glass, and it breaks
(1)(10) 30
Explanation: Dropping the glass directly
= = 5 𝑆𝑒𝑐 causes it to break – a clear cause effect
6 6
160. (b) 5 : 7 relationship.
𝑆 2𝑛 −1 2(3)−1 6−1
Explanation: 𝑆1 = 2𝑛1−1 = 2 x 4 = 8−1 = 175. (b) some actors may be fit
2 2 Explanation: Only some actors are dancers,
5/7 and dancers are fit, so some actors may be fit.
161. (d) 50m/s 176. (a) You either support this policy, or you’re
Explanation: 𝑉𝑓 = 𝑉𝑙 + 𝑎𝑡 = 0 + (10 x 5) = unpatriotic
50𝑚/𝑠 Explanation: A false dilemma limits choices
162. (b) 4 : 3 to two when more exist.
Explanation: Identical bodies interchange 177. (b) John is driving faster
their velocities. Explanation: Based on the given – cause –
ENGLISH effect relationship, increased speed may lead
KHAN ACADEMY to more fuel use.
163. (b) Deep reading promotes empathy and 178. (c) Viruses are unaffected by antibiotics
critical thinking Explanation: Antibiotics don’t treat viral
Explanation: The author contrasts deep infections; this shows a misunderstanding of
reading with digital distractions and highlights medical treatment.
the benefits of deep reading. 179. (b) The sun rises every day; therefore, it
164. (c) A rich and immersive experience will rise tomorrow
Explanation: The passage describes deep Explanation:
reading as “Slow, immersive, rich.” 180. (a) Correlation is not causation
165. (c) It may reduce the depth of Explanation: One example doesn’t disprove
understanding a general claim, also, other variables may be
Explanation: Technology is said to increase involved.
but potentially reduce comprehension.
166. (b) Critical
Explanation: The author critically addresses
the decline of deep reading due to digital
distractions.
167. (a) Reading in parts without focus
Explanation: “Fragmented reading” refers to

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