JEE Main 2024 Feb 1 Shift 2 — Physics

Match List - I with List - II.

List - I (Number)	List - II (Significant figure)
(A) 1001	(I) 3
(B) 010.1	(II) 4
(C) 100.100	(III) 5
(D) 0.0010010	(IV) 6

Choose the correct answer from the options given below :

Train A is moving along two parallel rail tracks towards north with speed 72 km/h and train B is moving towards south with speed 108 km/h. Velocity of train B with respect to A and velocity of ground with respect to B are (in $\mathrm{ms}^{-1}$) :

A cricket player catches a ball of mass 120 g moving with 25 m/s speed. If the catching process is completed in 0.1 s then the magnitude of force exerted by the ball on the hand of player will be (in SI unit) :

A body of mass 4 kg experiences two forces $\vec{F}_1 = 5\hat{i} + 8\hat{j} + 7\hat{k}$ and $\vec{F}_2 = 3\hat{i} - 4\hat{j} - 3\hat{k}$. The acceleration acting on the body is :

A disc of radius R and mass M is rolling horizontally without slipping with speed $v$. It then moves up an inclined smooth surface as shown in figure. The maximum height that the disc can go up the incline is :

a disc rolling horizontally with speed v towards an inclined plane; maximum height reached on the incline marked h

A light planet is revolving around a massive star in a circular orbit of radius R with a period of revolution T. If the force of attraction between planet and star is proportional to $R^{-3/2}$ then choose the correct option :

A big drop is formed by coalescing 1000 small droplets of water. The surface energy will become :

A diatomic gas ($\gamma = 1.4$) does 200 J of work when it is expanded isobarically. The heat given to the gas in the process is :

If the root mean square velocity of hydrogen molecule at a given temperature and pressure is 2 km/s, the root mean square velocity of oxygen at the same condition in km/s is :

$\mathrm{C_1}$ and $\mathrm{C_2}$ are two hollow concentric cubes enclosing charges 2Q and 3Q respectively as shown in figure. The ratio of electric flux passing through $\mathrm{C_1}$ and $\mathrm{C_2}$ is :

a small cube containing charge 2Q placed inside a larger cube; charge 3Q lies inside the larger cube but outside the smaller one

A galvanometer (G) of $2\ \Omega$ resistance is connected in the given circuit. The ratio of charge stored in $\mathrm{C_1}$ and $\mathrm{C_2}$ is :

a bridge circuit powered by a 6 V battery; one pair of opposite arms has resistors $4\ \Omega$ and $6\ \Omega$, the other pair has capacitors $C_1 = 4\ \mu F$ and $C_2 = 6\ \mu F$, with galvanometer G across the middle

In an ammeter, 5% of the main current passes through the galvanometer. If resistance of the galvanometer is G, the resistance of ammeter will be :

A transformer has an efficiency of 80% and works at 10 V and 4 kW. If the secondary voltage is 240 V, then the current in the secondary coil is :

If frequency of electromagnetic wave is 60 MHz and it travels in air along $z$ direction then the corresponding electric and magnetic field vectors will be mutually perpendicular to each other and the wavelength of the wave (in m) is :

A microwave of wavelength 2.0 cm falls normally on a slit of width 4.0 cm. The angular spread of the central maxima of the diffraction pattern obtained on a screen 1.5 m away from the slit, will be :

Monochromatic light of frequency $6 \times 10^{14}$ Hz is produced by a laser. The power emitted is $2 \times 10^{-3}$ W. How many photons per second on an average, are emitted by the source ?

(Given $h = 6.63 \times 10^{-34}$ Js)

From the statements given below :

(A) The angular momentum of an electron in $n^{\text{th}}$ orbit is an integral multiple of $\hbar$. (B) Nuclear forces do not obey inverse square law. (C) Nuclear forces are spin dependent. (D) Nuclear forces are central and charge independent. (E) Stability of nucleus is inversely proportional to the value of packing fraction.

Choose the correct answer from the options given below :

Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660 nm. The band gap of photodiode is found to be $\left(\frac{X}{8}\right)$ eV. The value of X is :

(Given, $h = 6.6 \times 10^{-34}$ Js, $e = 1.6 \times 10^{-19}$ C)

To measure the temperature coefficient of resistivity $\alpha$ of a semiconductor, an electrical arrangement shown in the figure is prepared. The arm BC is made up of the semiconductor. The experiment is being conducted at 25°C and resistance of the semiconductor arm is 3 m$\Omega$. Arm BC is cooled at a constant rate of 2°C/s. If the galvanometer G shows no deflection after 10 s, then $\alpha$ is :

Wheatstone bridge ABCD with arm AB = 0.8 m$\Omega$, arm AD = 1 m$\Omega$, arm DC = 3 m$\Omega$, arm BC the semiconductor, galvanometer G across the middle, supply V = 5 mV

In a metre-bridge when a resistance in the left gap is 2 $\Omega$ and unknown resistance in the right gap, the balance length is found to be 40 cm. On shunting the unknown resistance with 2 $\Omega$, the balance length changes by :

A particle initially at rest starts moving from reference point $x = 0$ along $x$-axis, with velocity $v$ that varies as $v = 4\sqrt{x}$ m/s. The acceleration of the particle is ________ $\mathrm{ms}^{-2}$.

A uniform rod AB of mass 2 kg and length 30 cm at rest on a smooth horizontal surface. An impulse of force 0.2 Ns is applied to end B. The time taken by the rod to turn through at right angles will be $\frac{\pi}{x}$ s, where $x =$ ________.

One end of a metal wire is fixed to a ceiling and a load of 2 kg hangs from the other end. A similar wire is attached to the bottom of the load and another load of 1 kg hangs from this lower wire. Then the ratio of longitudinal strain of upper wire to that of the lower wire will be ________.

[Area of cross section of wire $= 0.005\ \mathrm{cm}^2$, $Y = 2 \times 10^{11}\ \mathrm{Nm}^{-2}$ and $g = 10\ \mathrm{ms}^{-2}$]

A mass m is suspended from a spring of negligible mass and the system oscillates with a frequency $f_1$. The frequency of oscillations if a mass 9 m is suspended from the same spring is $f_2$. The value of $\frac{f_1}{f_2}$ is ________.

Suppose a uniformly charged wall provides a uniform electric field of $2 \times 10^4$ N/C normally. A charged particle of mass 2 g being suspended through a silk thread of length 20 cm and remain stayed at a distance of 10 cm from the wall. Then the charge on the particle will be $\frac{1}{\sqrt{x}}$ $\mu$C where $x =$ ________. [use $g = 10$ m/s$^2$]

In an electrical circuit drawn below the amount of charge stored in the capacitor is ________ $\mu$C.

a 10 V battery in series with $R_1 = 4\ \Omega$; a branch with capacitor $C = 10\ \mu F$ in series with $R_2 = 5\ \Omega$ connected in parallel with $R_3 = 6\ \Omega$

A moving coil galvanometer has 100 turns and each turn has an area of 2.0 $\mathrm{cm}^2$. The magnetic field produced by the magnet is 0.01 T and the deflection in the coil is 0.05 radian when a current of 10 mA is passed through it. The torsional constant of the suspension wire is $x \times 10^{-5}$ N-m/rad. The value of $x$ is ________.

A coil of 200 turns and area 0.20 $\mathrm{m}^2$ is rotated at half a revolution per second and is placed in uniform magnetic field of 0.01 T perpendicular to axis of rotation of the coil. The maximum voltage generated in the coil is $\frac{2\pi}{\beta}$ volt. The value of $\beta$ is ________.

In Young's double slit experiment, monochromatic light of wavelength 5000 Å is used. The slits are 1.0 mm apart and screen is placed at 1.0 m away from slits. The distance from the centre of the screen where intensity becomes half of the maximum intensity for the first time is ________ $\times 10^{-6}$ m.

A particular hydrogen - like ion emits the radiation of frequency $3 \times 10^{15}$ Hz when it makes transition from n = 2 to n = 1. The frequency of radiation emitted in transition from n = 3 to n = 1 is $\frac{x}{9} \times 10^{15}$ Hz, when $x =$ ________.