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Physics · PYQ NEET UG 2023
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1621 questions
Physics · UNITS AND MEASUREMENT
What determines the precision of a measurement reflected by the number of significant figures?
Read answer →Physics · SYSTEMS OF PARTICLES AND ROTATIONAL MOTION
Four particles of masses \( 1\text{ kg} \), \( 2\text{ kg} \), \( 3\text{ kg} \), and \( 4\text{ kg} \) have position vectors \( \mathbf{r}_1 = (\hat{\mathbf{i}} + 2\hat{\mathbf{j}} + 3\hat{\mathbf{k}})\text{ m} \), \( \mathbf{r}_2 = (2\hat{\mathbf{i}} - \hat{\mathbf{j}} + \hat{\mathbf{k}})\text{ m} \), \( \mathbf{r}_3 = (-\hat{\mathbf{i}} + 3\hat{\mathbf{j}} - 2\hat{\mathbf{k}})\text{ m} \), and \( \mathbf{r}_4 = (3\hat{\mathbf{i}} - 2\hat{\mathbf{j}} + 2\hat{\mathbf{k}})\text{ m} \). The magnitude of the position vector of their centre of mass is:
Read answer →Physics · PYQ NEET UG 2017
The given electrical network is equivalent to
Read answer →Physics · LAWS OF MOTION
A loaded truck of mass \( 4000 \text{ kg} \) and a light car of mass \( 1000 \text{ kg} \) have the same linear momentum. If the speed of the light car is \( 24 \text{ m s}^{-1} \), the speed of the loaded truck is:
Read answer →Physics · WORK, ENERGY AND POWER
Referring to the force-displacement graph shown below, an applied force F acts on a block moving along a straight line on a rough horizontal surface against a constant friction force \( f = -50 N \). The total net work done on the block over the entire \( 20 m \) distance is:
Read answer →Physics · PYQ NEET UG 2018
At what temperature will the r.m.s. speed of oxygen molecules become just sufficient for escaping from the Earth's atmosphere? (Given: Mass of oxygen molecule \( = 2.76 \times 10^{-26}\text{ kg} \), Boltzmann's constant \( k_{\text{B}} = 1.38 \times 10^{-23}\text{ J K}^{-1} \))
Read answer →Physics · PYQ NEET UG 2021
In the product \( \vec{F} = q(\vec{v} \times \vec{B}) = qv \times (B_1\hat{i} + B_2\hat{j} + B_3\hat{k}) \) For \( q = 1 \) and \( \vec{v} = 2\hat{i} + 4\hat{j} + 6\hat{k} \) and \( \vec{F} = 4\hat{i} - 20\hat{j} + 12\hat{k} \) What will be the complete expression for \( \vec{B} \)?
Read answer →Physics · PYQ NEET UG 2019(1)
At a point A on the earth's surface the angle of dip, \( \delta = +25^\circ \). At a point B on the earth's surface the angle of dip, \( \delta = -25^\circ \). We can interpret that:
Read answer →Physics · UNITS AND MEASUREMENT
Consider the following measured values: (i) \( 0.002030\text{ m} \), (ii) \( 2.030 \times 10^3\text{ m} \), (iii) \( 2030\text{ m} \). The number of significant figures in (i), (ii), and (iii) respectively are:
Read answer →Physics · Electrostatic Potential
An electric dipole of dipole moment \( p = 2 \times 10^{-8}\text{ C m} \) is placed in an electric field. At a point \( r = 1\text{ m} \) along the axis of the dipole, what is the magnitude of the electrostatic potential? (\( \frac{1}{4\pi\varepsilon_0} = 9 \times 10^9\text{ N m}^2\text{ C}^{-2} \))
Read answer →Physics · PYQ NEET UG 2019(1)
A copper rod of \( 88\text{ cm} \) and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is: (\( \alpha_{\text{cu}} = 1.7 \times 10^{-5}\text{ K}^{-1} \) and \( \alpha_{\text{Al}} = 2.2 \times 10^{-5}\text{ K}^{-1} \))
Read answer →Physics · SYSTEMS OF PARTICLES AND ROTATIONAL MOTION
Given below are two statements: Statement I: When a girl sitting on a swivel chair stretches her arms horizontally, her moment of inertia about the axis of rotation increases, leading to a decrease in her angular speed. Statement II: In the absence of external torque, the rotational kinetic energy of the girl-chair system remains strictly conserved during the stretching and folding of arms. In the light of the above statements, choose the most appropriate answer from the options given below:
Read answer →Physics · PYQ NEET UG 2022
Two point charges \( -q \) and \( +q \) are placed at a distance of \( L \), as shown in the figure. The magnitude of electric field intensity at a distance \( R \) (\( R \gg L \)) varies as:
Read answer →Physics · SYSTEMS OF PARTICLES AND ROTATIONAL MOTION
Three particles, each of mass \( m \), are situated at the vertices of an equilateral triangle. The centre of mass of this three-particle system lies at:
Read answer →Physics · GRAVITATION
The gravitational force between two point masses \( m_1 \) and \( m_2 \) separated by distance \( r \) is \( F \). If the mass \( m_1 \) is increased by \( 100\% \), mass \( m_2 \) is decreased by \( 50\% \), and the distance between them is halved, the new gravitational force will be:
Read answer →Physics · GRAVITATION
In the given diagram, a point mass \( m \) is located at depth \( d \) from the Earth's surface. What fraction of the Earth's total mass \( M_E \) contributes to the gravitational force acting on this mass, assuming uniform density?
Read answer →Physics · MOTION IN A STRAIGHT LINE
Given below are two statements: Statement I: The average velocity of an object can be zero even if its average speed is non-zero. Statement II: The magnitude of average velocity is always equal to average speed. In the light of the above statements, choose the most appropriate answer from the options given below:
Read answer →Physics · UNITS AND MEASUREMENT
If the length \( l = 16.2 \pm 0.1 \text{ cm} \), what is the percentage error in the measurement of length \( l \)?
Read answer →Physics · Electrostatic Potential
A parallel plate capacitor is charged to a potential \( V \) by a battery. The battery is then disconnected and a dielectric slab of dielectric constant \( K \) is completely inserted between the plates. If the initial electrostatic energy stored was \( U_0 \), what is the work done by the external agent in inserting the slab slowly?
Read answer →Physics · MOTION IN A PLANE
A particle thrown vertically upwards from ground reaches a maximum height \( H \). The ratio of the time taken by the particle to reach height \( \frac{3}{4}H \) during its upward motion to the total time of flight \( T_f \) is:
Read answer →Physics · Electrostatic Potential
Given below are two statements: Statement I: The total net charge on a parallel plate capacitor bearing charges \( +Q \) and \( -Q \) on its two plates is \( 2Q \). Statement II: The capacitance of a parallel plate capacitor is doubled if the separation between the plates is halved while maintaining the plate area constant. In the light of the above statements, choose the most appropriate answer from the options given below:
Read answer →Physics · UNITS AND MEASUREMENT
How many significant figures do the exact numbers appearing in formulae like \( 2\pi \) in \( T = 2\pi\sqrt{\frac{L}{g}} \) have?
Read answer →Physics · PYQ NEET UG 2016(2)
