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#1BiologyNEET2025Plant Physiology🔥 95 asked
Which complex of the electron transport chain does NOT pump protons across the inner mitochondrial membrane?
A.Complex I (NADH dehydrogenase)
B.Complex II (Succinate dehydrogenase)
C.Complex III (Cytochrome bc₁)
D.Complex IV (Cytochrome c oxidase)
#2BiologyNEET2025Human Physiology🔥 118 asked
Which of the following correctly describes the role of HCl in the stomach?
A.It activates trypsinogen into trypsin
B.It converts pepsinogen into pepsin and provides an acidic medium
C.It emulsifies fats for lipase action
D.It activates enterokinase in the duodenum
#3ChemistryNEET2025Organic Compounds Containing Oxygen
Propanone reacts with 2,4-dinitrophenylhydrazine (2,4-DNP) to form:
A.An oxime
B.A semicarbazone
C.A 2,4-dinitrophenylhydrazone
D.A Schiff base
#4ChemistryJEE Main2025Environmental Chemistry
Which of the following reactions represents the formation of ozone in the stratosphere?
A.3O₂ → 2O₃ (direct combination)
B.O₂ + UV → 2O; O + O₂ → O₃ (Chapman mechanism)
C.O₃ → O₂ + O (only decomposition)
D.N₂ + O₂ → 2NO (thermal reaction)
#5ChemistryJEE Main2025Polymers
Buna-N rubber is a copolymer of:
A.Butadiene and styrene
B.Butadiene and acrylonitrile
C.Isoprene and styrene
D.Chloroprene and butadiene
#6ChemistryJEE Main2025s-Block Elements
The product formed when Na₂O₂ reacts with water is:
A.NaOH + O₂
B.NaOH + H₂O₂
C.NaOH + H₂
D.Na₂O + H₂O
#7ChemistryJEE Main2025The Solid State
An element with molar mass 27 g/mol forms an FCC lattice with density 2.7 g/cm³. The edge length of the unit cell is (Nₐ = 6 × 10²³):
A.2.0 × 10⁻⁸ cm
B.3.0 × 10⁻⁸ cm
C.4.0 × 10⁻⁸ cm
D.4.05 × 10⁻⁸ cm
#8ChemistryJEE Main2025The Solid State
In an antifluorite structure (like Na₂O), the positions of cations and anions compared to the fluorite structure are:
A.Both occupy the same positions
B.Cations and anions exchange positions
C.Cations occupy octahedral voids instead of tetrahedral
D.Anions form a BCC arrangement
#9ChemistryJEE Main2025Surface Chemistry
The shape of Freundlich adsorption isotherm plotted as log(x/m) vs log P is:
A.A parabola
B.A straight line with slope 1/n
C.An exponential curve
D.A hyperbola
#10PhysicsNEET2025Rotational Motion
A uniform sphere rolls down an incline without slipping. The acceleration down the incline is proportional to:
A.sin θ only
B.sin θ / (1 + I/(MR²))
C.g sin θ directly
D.R / sin θ
#11MathematicsJEE Main2025Applications of Derivatives
The absolute maximum of f(x) = x³ − 3x + 2 on [−2, 2] is:
#12MathematicsJEE Main2025Circles
The number of tangents that can be drawn from the point (5, 0) to the circle x² + y² = 9 is:
A.0
B.1
C.2
D.infinitely many
#13MathematicsJEE Main2025Circles
The equation of the tangent to x² + y² − 4x − 6y + 9 = 0 at the point (2, 1) is:
A.x = 2
B.x + y = 3
C.2x + y = 5
D.y = 1
#14MathematicsJEE Main2025Complex Numbers
The polar form of z = −√3 + i is
A.2(cos π/6 + i sin π/6)
B.2(cos 5π/6 + i sin 5π/6)
C.2(cos 7π/6 + i sin 7π/6)
D.2(cos 11π/6 + i sin 11π/6)
#15MathematicsJEE Main2025Complex Numbers
The point dividing the join of z₁ = 2 + 3i and z₂ = 6 + 7i internally in the ratio 1 : 3 is
A.3 + 4i
B.4 + 5i
C.5 + 6i
D.4 + 3i
#16MathematicsJEE Main2025Complex Numbers
If |z − 2 − 3i| = 5, the minimum value of |z| is
A.5 − √13
B.√13 − 5
C.5 + √13
D.5
#17MathematicsJEE Main2025Differentiation
If f(x) = (x − 1)(x − 2)(x − 3), then f'(x) at x = 0 is:
#18MathematicsCUET2025Differentiation
The derivative of e^(3x+2) with respect to x is:
A.e^(3x+2)
B.3e^(3x+2)
C.(3x+2)e^(3x+1)
D.2e^(3x+2)
#19MathematicsJEE Main2025Limits and Continuity
lim(x→∞) (1 + 1/x²)^(x²) equals:
#20MathematicsJEE Main2025Limits and Continuity
f(x) = { x + 1, if x < 1; 3, if x = 1; 3x − 1, if x > 1 }. At x = 1, f has:
A.Jump discontinuity
B.Removable discontinuity
C.No discontinuity (f is continuous)
D.Infinite discontinuity