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Physics

A massless square loop, of wire of resistance \( 10 \, \Omega \), surrounding a mass of \( 1 \, \text{g} \), hangs vertically with one of its sides in a uniform magnetic field of \( 10^{3} \, \text{G} \), directed outwards in the shaded region. A dc voltage \( V \) is applied to the loop. For what value of \( V \), the magnetic force will exactly balance the weight of the supporting mass of \( 1 \, \text{g} \)? \( \text{(If sides of the loop = } 10 \, \text{cm}, \, g = 10 \, \text{ms}^{-2} \text{)} \)

2.

The figure represents the momentum time \( (p - t) \) curve for a particle moving along an axis under the influence of the force. Identify the regions on the graph where the magnitude of the force is maximum and minimum respectively? If \( (t_{3} - t_{2}) < t_{1} \).

3.

Electric field in a certain region is given by \( \vec{E} = \left( \frac{A}{x^{2}} \hat{i} + \frac{B}{y^{3}} \hat{j} \right) \). The SI unit of \( A \) and \( B \) are:

4.

In a series LR circuit with \( X_{L} = R \), power factor is \( P_{1} \). If a capacitance \( C \) with \( X_{C} = X_{L} \) is added to the circuit the power factor becomes \( P_{2} \). The ratio of \( P_{1} \) to \( P_{2} \) will be:

5.

Speed of an electron in Bohr’s \( 7^{\text{th}} \) orbit for hydrogen atom is \( 3.6 \times 10^{6} \, \text{m/s} \). The corresponding speed of the electron in \( 3^{\text{rd}} \) orbit, in \( \text{m/s} \) is:

6.

Choose the correct relationship between Poisson ratio \( (\sigma) \), bulk modulus \( (K) \) and modulus of rigidity \( (\eta) \) of a given solid object.

7.

A person has been using spectacles of power \( -1.0 \) dioptre for distant vision and a separate reading glass of power \( 2.0 \) dioptres. What is the least distance of distinct vision for this person?

8.

Two isolated metallic solid spheres of radii \( R \) and \( 2R \) are charged such that both have same charge density \( \sigma \). The spheres are then connected by a thin conducting wire. If the new charge density of the bigger sphere is \( \sigma' \). The ratio \( \frac{\sigma'}{\sigma} \) is:

9.

A sinusoidal carrier voltage is amplitude modulated. The resultant amplitude modulated wave has maximum and minimum amplitude of \( 120 \, \text{V} \) and \( 80 \, \text{V} \) respectively. The amplitude of each sideband is:

10.

Match Column-I with Column-II.

Choose the correct answer from the options given below:

11.

A small object rest, absorbs a light pulse of power \( 20 \, \text{mW} \) and duration \( 30 \, \text{ns} \). Assuming speed of light as \( 3 \times 10^{8} \, \text{m/s} \), the momentum of the object becomes equal to:

12.

If the gravitation field in the space is given as \( \left( -\frac{K}{r^{2}} \right) \). Taking the reference point to be at \( r = 2 \, \text{cm} \) with gravitational potential \( V = 10 \, \text{J/kg} \). Find the gravitational potential at \( r = 3 \, \text{cm} \) in SI unit. (Given, that \( K = 6 \, \text{cm/kg} \))

13.

The output waveform of the given logical circuit for the following inputs \( A \) and \( B \) as shown below, is:

14.

The height of liquid column raised in a capillary two of certain radius when dipped in liquid \( A \) vertically is, \( 5 \, \text{cm} \). If the tube is dipped in a similar manner in another liquid \( B \) of surface tension and density double the values of liquid \( A \), the height of liquid column raised in liquid \( B \) would be _______ \( \text{m} \).

15.

The charge flowing in a conductor changes with time as \( Q(t) = \alpha t - \beta t^{2} + \gamma t^{3} \). Where \( \alpha \), \( \beta \) and \( \gamma \) are constants. Minimum value of current is:

16.

The pressure \( (P) \) and temperature \( (T) \) relationship of an ideal gas obeys the equation \( PT^{2} = \text{constant} \). The volume expansion coefficient of the gas will be:

17.

The magnetic moments associated with two closely wound circular coils \( A \) and \( B \) of radius \( r_{A} = 10 \, \text{cm} \) and \( r_{B} = 20 \, \text{cm} \) respectively are equal if: (Where \( N_{A}, I_{A} \) and \( N_{B}, I_{B} \) are number of turn and current of \( A \) and \( B \) respectively)

18.

A ball of mass \( 200 \, \text{g} \) rests on a vertical post of height \( 20 \, \text{m} \). A bullet of mass \( 10 \, \text{g} \), travelling in horizontal direction, hits the centre of the ball. After collision both travels independently. The ball hits the ground at a distance \( 30 \, \text{m} \) and the bullet at a distance of \( 120 \, \text{m} \) from the foot of the post. The value of initial velocity of the bullet will be (if \( g = 10 \, \text{m/s}^{2} \)).

19.

As per the given figure, a small ball \( P \) slides sown the quadrant of a circle and hits the other ball \( Q \) of equal mass which is initially at rest. Neglecting the effect of friction and assume the collision to be elastic, the velocity of ball \( Q \) after collision will be: \( (g = 10 \, \text{m/s}^2) \).

20.

Heat is given to an ideal gas in an isothermal process.
A. Internal energy of the gas will decrease.
B. Internal energy of the gas will increase.
C. Internal energy of the gas will not change.
D. The gas will do positive work.
E. The gas will do negative work.

21.

In the following circuit, the magnitude of current \( I_{1} \) is _______ \( \text{A} \).

22.

In a screw gauge, there are \(100\) divisions on the circular scale and the main scale moves by \(0.5 \, \text{mm}\) on a complete rotation of the circular scale. The zero of circular scale lies \(6\) divisions below the line of graduation when two studs are brought in contact with each other. When a wire is placed between the studs, \(4\) linear scale divisions are clearly visible while \(46^{\text{th}}\) division the circular scale coincide with the reference line. The diameter of the wire is _______ \( \times 10^{-2} \, \text{mm} \).

23.

In an experiment for estimating the value of focal length of converging mirror, image of an object placed at \(40 \, \text{cm}\) from the pole of the mirror is formed at distance \(120 \, \text{cm}\) from the pole of the mirror. These distances are measured with a modified scale in which there are \(20\) small divisions in \(1 \, \text{cm}\). The value of error in measurement of focal length of the mirror is \( \frac{1}{K} \, \text{cm} \). The value of \( K \) is _______.

24.

A horse rider covers half the distance with \(5 \, \text{m/s}\) speed. The remaining part of the distance was travelled with speed \(10 \, \text{m/s}\) for half the time and with \(15 \, \text{m/s}\) for other half of the time. The mean speed of the rider averaged over the whole time of motion is \( \frac{x}{7} \, \text{m/s} \). The value of \( x \) is _______.

25.

A point source of light is placed at the centre of curvature of a hemispherical surface. The source emits a power of \( 24 \, \text{W} \). The radius of curvature of hemisphere is \( 10 \, \text{cm} \) and the inner surface is completely reflecting. The force on the hemisphere due to the light falling on it is _______ \( \times 10^{-8} \, \text{N} \).

26.

A thin uniform rod of length \( 2 \, \text{m} \), cross sectional area \( A \) and density \( d \) is rotated about an axis passing through the centre and perpendicular to its length with angular velocity \( \omega \). If value of \( \omega \) in terms of its rotational kinetic energy \( E \) is \( \sqrt{\frac{\alpha E}{A d}} \) then value of \( \alpha \) is _______.

27.

As per the given figure, if \( \frac{dI}{dt} = -1 \, \text{A/s} \) then the value of \( V_{AB} \) at this instant will be _______ \( \text{V} \).

28.

In Young’s double slit experiment, two slits \( S_{1} \) and \( S_{2} \) are \( d \) distance apart and the separation from slits screen is \( D \) (as shown in figure). Now if two transparent slobs of equal thickness \( 0.1 \, \text{mm} \) but index \( 1.51 \) and \( 1.55 \) are introduction in the path of beam \( (\lambda = 4000\ Å\ \) from \( S_{1} \) and \( S_{2} \) respectively. The central bright fringe spot will shift by ________ number of fringes.

29.

The general displacement of a simple harmonic oscillator is \( x = A \sin \omega t \). Let \( T \) be its time period. The slope of its potential energy \( (U) \) - time \( (t) \) curve will be maximum when \( t = \frac{T}{\beta} \). The value of \( \beta \) is ________.

30.

A capacitor of capacitance \( 900 \, \mu \text{F} \) charged by a \( 100 \, \text{V} \) battery. The capacitor is disconnected from the battery and connected to another uncharged identical capacitor such that one plate of uncharged capacitor connected to positive plate and another plate of uncharged connected to negative plate of the charged capacitor. The loss of energy in this process is measured as \( x \times 10^{-2} \, \text{J} \). The value of \( x \) is ________.

JEE Main 2023 30th Jan Morning Shift

Physics Chemistry Mathematics

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The output waveform of the given logical circuit for the following inputs \( A \) and \( B \) as shown below, is:

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