The emf of a cell having internal resistance \(1~ \Omega\) is balanced against a length of \(330~\text{cm}\) on a potentiometer wire. When an external resistance of \(2 ~\Omega\) is connected across the cell, the balancing length will be:
| 1. | \(220~\text{cm}\) | 2. | \(330~\text{cm}\) |
| 3. | \(115~\text{cm}\) | 4. | \(332~\text{cm}\) |
Level 3: 35%-60%
NEET - 2023
Hints
A \(1\) kg object strikes a wall with velocity \(1\) ms–1 at an angle of \(60^\circ\) with the wall and reflects at the same angle. If it remains in contact with the wall for \(0.1\) s, then the force exerted on the wall is:
| 1. | \(30\sqrt3~\text N\) | 2. | zero |
| 3. | \(10\sqrt3~\text N\) | 4. | \(20\sqrt3~\text N\) |
Subtopic: Newton's Laws |
82%
Level 1: 80%+
NEET - 2023
Hints
The angular momentum of an electron moving in an orbit of a hydrogen atom is \(1.5\left(\frac h\pi\right).\) The energy in the same orbit is nearly:
| 1. | \(-1.5~\text{eV}\) | 2. | \(-1.6~\text{eV}\) |
| 3. | \(-1.3~\text{eV}\) | 4. | \(-1.4~\text{eV}\) |
Subtopic: Bohr's Model of Atom |
83%
Level 1: 80%+
NEET - 2023
Hints
A particle is executing uniform circular motion with velocity \(\vec v\) and acceleration \(\vec a.\) Which of the following is true?
| 1. | \(\vec v\) is a constant; \(\vec a\) is not a constant. |
| 2. | \(\vec v\) is not a constant; \(\vec a\) is not a constant. |
| 3. | \(\vec v\) is a constant; \(\vec a\) is a constant. |
| 4. | \(\vec v\) is not a constant; \(\vec a\) is a constant. |
Subtopic: Circular Motion |
68%
Level 2: 60%+
NEET - 2023
Hints
A simple pendulum oscillating in air has a period of \(\sqrt3\) s. If it is completely immersed in non-viscous liquid, having density \(\left(\dfrac14\right)^{\text{th}}\) of the material of the bob, the new period will be:
| 1. | \(2\sqrt3\) s | 2. | \(\dfrac{2}{\sqrt3}\) s |
| 3. | \(2\) s | 4. | \(\dfrac{\sqrt 3}{2}\) s |
Subtopic: Angular SHM |
54%
Level 3: 35%-60%
NEET - 2023
Hints
Incorrect set of quantum numbers from the following is:
1. n=4, l=3, m1 =-3, -2, -1, 0, +1, +2, +3, ms=-1/2
2. n=5, l=2, m1 =-2, -1, +1, +2, ms=+1/2
3. n=4, l=2, m1 = -2, -1, 0, +1, +2, ms=-1/2
4. n=5, l=3, m1 =-3, -2, -1, 0, +1, +2, +3, ms=+1/2
1. n=4, l=3, m1 =-3, -2, -1, 0, +1, +2, +3, ms=-1/2
2. n=5, l=2, m1 =-2, -1, +1, +2, ms=+1/2
3. n=4, l=2, m1 = -2, -1, 0, +1, +2, ms=-1/2
4. n=5, l=3, m1 =-3, -2, -1, 0, +1, +2, +3, ms=+1/2
Subtopic: Quantum Numbers & Schrodinger Wave Equation |
83%
Level 1: 80%+
NEET - 2023
Hints
| Assertion (A): | Ionization enthalpy increases along each series of transition elements from left to right. However, small variations occur. |
| Reason (R): | There is a corresponding increase in nuclear charge which accompanies the filling of electrons in the inner d-orbitals. |
| 1. | (A) is True but (R) is False |
| 2. | (A) is False but (R) is True |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
Subtopic: d-Block Elements- Properties & Uses |
75%
Level 2: 60%+
NEET - 2023
Hints
Given below are two statements:
1. Statement I is correct but Statement II is incorrect
2. Statement I is incorrect but Statement II is correct
3. Both Statement I and Statement II are correct
4. Both Statement I and Statement II are incorrect
| Statement I : | Propene on treatment with diborane gives an addition product with the formula \((CH_3)_2-CH)_3 -B \) |
| Statement II : | Oxidation of \((CH_3)_2-CH)_3 -B\) with hydrogen peroxide in presence of \(NaOH \) gives propan-2-ol. |
1. Statement I is correct but Statement II is incorrect
2. Statement I is incorrect but Statement II is correct
3. Both Statement I and Statement II are correct
4. Both Statement I and Statement II are incorrect
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
Level 4: Below 35%
NEET - 2024
Hints
Find the molecule that is paramagnetic among the following.
1. Hydrogen (H₂)2. Lithium (Li₂)
3. Carbon (C₂)
4. Oxygen (O₂)
Subtopic: M.O.T |
83%
Level 1: 80%+
NEET - 2024
Hints
For a weak acid HA, the percentage of dissociation is nearly 1% at equilibrium.
If the concentration of acid is 0.1 mol L-1, then the correct option for its Ka at the same temperature will be:
If the concentration of acid is 0.1 mol L-1, then the correct option for its Ka at the same temperature will be:
| 1. | \(1 \times 10^{-4}\) | 2. | \(1 \times 10^{-6} \) |
| 3. | \(1 \times 10^{-5} \) | 4. | \(1 \times 10^{-3} \) |
Subtopic: Ionisation Constant of Acid, Base & Salt |
69%
Level 2: 60%+
NEET - 2023
Hints
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