NTA JEE Main 26th July 2022 Shift 2 - Physics

Two projectiles are thrown with same initial velocity making an angle of $$45°$$ and $$30°$$ with the horizontal respectively. The ratio of their respective ranges will be

Two masses $$M_1$$ and $$M_2$$ are tied together at the two ends of a light inextensible string that passes over a frictionless pulley. When the mass $$M_2$$ is twice that of $$M_1$$, the acceleration of the system is $$a_1$$. When the mass $$M_2$$ is thrice that of $$M_1$$, the acceleration of the system is $$a_2$$. The ratio $$\dfrac{a_1}{a_2}$$ will be

A ball of mass $$0.15 \text{ kg}$$ hits the wall with its initial speed of $$12 \text{ m s}^{-1}$$ and bounces back without changing its initial speed. If the force applied by the wall on the ball during the contact is $$100 \text{ N}$$, calculate the time duration of the contact of ball with the wall.

A body of mass $$8 \text{ kg}$$ and another of mass $$2 \text{ kg}$$ are moving with equal kinetic energy. The ratio of their respective momenta will be

A body is projected vertically upwards from the surface of earth with a velocity equal to one third of escape velocity. The maximum height attained by the body will be (Take radius of earth $$= 6400 \text{ km}$$ and $$g = 10 \text{ m s}^{-2}$$)

The area of cross section of the rope used to lift a load by a crane is $$2.5 \times 10^{-4} \text{ m}^2$$. The maximum lifting capacity of the crane is 10 metric tons. To increase the lifting capacity of the crane to 25 metric tons, the required area of cross section of the rope should be (take $$g = 10 \text{ m s}^{-2}$$)

An ice cube of dimensions $$60 \text{ cm} \times 50 \text{ cm} \times 20 \text{ cm}$$ is placed in an insulation box of wall thickness $$1 \text{ cm}$$. The box keeping the ice cube at $$0°C$$ of temperature is brought to a room of temperature $$40°C$$. The rate of melting of ice is approximately: (Latent heat of fusion of ice is $$3.4 \times 10^5 \text{ J kg}^{-1}$$ and thermal conductivity of insulation wall is $$0.05 \text{ W m}^{-1} °C^{-1}$$)

A gas has $$n$$ degrees of freedom. The ratio of specific heat of gas at constant volume to the specific heat of gas at constant pressure will be

A transverse wave is represented by $$y = 2\sin(\omega t - kx) \text{ cm}$$. The value of wavelength (in cm) for which the wave velocity becomes equal to the maximum particle velocity, will be

Two uniformly charged spherical conductors $$A$$ and $$B$$ of radii $$5 \text{ mm}$$ and $$10 \text{ mm}$$ are separated by a distance of $$2 \text{ cm}$$. If the spheres are connected by a conducting wire, then in equilibrium condition, the ratio of the magnitudes of the electric fields at the surface of the sphere $$A$$ and $$B$$ will be

A source of potential difference $$V$$ is connected to the combination of two identical capacitors as shown in the figure. When key $$K$$ is closed, the total energy stored across the combination is $$E_1$$. Now key $$K$$ is opened and dielectric of dielectric constant $$5$$ is introduced between the plates of the capacitors. The total energy stored across the combination is now $$E_2$$. The ratio $$\dfrac{E_1}{E_2}$$ will be

A battery of $$6 \text{ V}$$ is connected to the circuit as shown below. The current $$I$$ drawn from the battery is

Two concentric circular loops of radii $$r_1 = 30 \text{ cm}$$ and $$r_2 = 50 \text{ cm}$$ are placed in $$X-Y$$ plane as shown in the figure. A current $$I = 7 \text{ A}$$ is flowing through them in the direction as shown in figure. The net magnetic moment of this system of two circular loops is approximately

A velocity selector consists of electric field $$\vec{E} = E\hat{k}$$ and magnetic field $$\vec{B} = B\hat{j}$$ with $$B = 12 \text{ mT}$$. The value $$E$$ required for an electron of energy $$728 \text{ eV}$$ moving along the positive x-axis to pass undeflected is (Given, mass of electron $$= 9.1 \times 10^{-31} \text{ kg}$$)

The oscillating magnetic field in a plane electromagnetic wave is given by $$B_y = 5 \times 10^{-6} \sin[1000\pi(5x - 4 \times 10^8 t)] \text{ T}$$. The amplitude of electric field will be

Light travels in two media $$M_1$$ and $$M_2$$ with speeds $$1.5 \times 10^8 \text{ m s}^{-1}$$ and $$2.0 \times 10^8 \text{ m s}^{-1}$$ respectively. The critical angle between them is

A nucleus of mass $$M$$ at rest splits into two parts having masses $$\dfrac{M'}{3}$$ and $$\dfrac{2M'}{3}$$ ($$M' < M$$). The ratio of de Broglie wavelength of two parts will be

Mass numbers of two nuclei are in the ratio of $$4:3$$. Their nuclear densities will be in the ratio of

The maximum and minimum voltage of an amplitude modulated signal are $$60 \text{ V}$$ and $$20 \text{ V}$$ respectively. The percentage modulation index will be

In a Vernier Caliper 10 divisions of Vernier scale is equal to the 9 divisions of main scale. When both jaws of Vernier calipers touch each other, the zero of the Vernier scale is shifted to the left of zero of the main scale and 4th Vernier scale division exactly coincides with the main scale reading. One main scale division is equal to $$1 \text{ mm}$$. While measuring diameter of a spherical body, the body is held between two jaws. It is now observed that zero of the Vernier scale lies between 30 and 31 divisions of main scale reading and 6th Vernier scale division exactly coincides with the main scale reading. The diameter of the spherical body will be:

If $$\vec{A} = 2\hat{i} + 3\hat{j} - \hat{k} \text{ m}$$ and $$\vec{B} = \hat{i} + 2\hat{j} + 2\hat{k} \text{ m}$$. The magnitude of component of vector $$\vec{A}$$ along vector $$\vec{B}$$ will be ______ m.

The radius of gyration of a cylindrical rod about an axis of rotation perpendicular to its length and passing through the center will be ______ m. Given, the length of the rod is $$10\sqrt{3} \text{ m}$$.

A uniform heavy rod of mass $$20 \text{ kg}$$, cross sectional area $$0.4 \text{ m}^2$$ and length $$20 \text{ m}$$ is hanging from a fixed support. Neglecting the lateral contraction, the elongation in the rod due to its own weight is $$x \times 10^{-9} \text{ m}$$. The value of $$x$$ is ______. (Given: Young's modulus $$Y = 2 \times 10^{11} \text{ N m}^{-2}$$ and $$g = 10 \text{ m s}^{-2}$$)

As per given figures, two springs of spring constants $$K$$ and $$2K$$ are connected to mass $$m$$. If the period of oscillation in figure (a) is $$3 \text{ s}$$, then the period of oscillation in figure (b) will be $$\sqrt{x} \text{ s}$$. The value of $$x$$ is ______.

Three point charges of magnitude $$5 \mu C$$, $$0.16 \mu C$$ and $$0.3 \mu C$$ are located at the vertices $$A$$, $$B$$, $$C$$ of a right angled triangle whose sides are $$AB = 3 \text{ cm}$$, $$BC = 3\sqrt{2} \text{ cm}$$ and $$CA = 3 \text{ cm}$$ and point $$A$$ is the right angle corner. Charge at point $$A$$ experiences ______ N of electrostatic force due to the other two charges.

A potentiometer wire of length $$300 \text{ cm}$$ is connected in series with a resistance $$780 \Omega$$ and a standard cell of emf $$4 \text{ V}$$. A constant current flows through potentiometer wire. The length of the null point for cell of emf $$20 \text{ mV}$$ is found to be $$60 \text{ cm}$$. The resistance of the potentiometer wire is ______ $$\Omega$$.

In a coil of resistance $$8 \Omega$$, the magnetic flux due to an external magnetic field varies with time as $$\phi = \dfrac{2}{3}(9 - t^2)$$. The value of total heat produced in the coil, till the flux becomes zero, will be ______ J.

In the given figure, the face $$AC$$ of the equilateral prism is immersed in a liquid of refractive index $$n$$. For incident angle $$60°$$ at the side $$AC$$, the refracted light beam just grazes along face $$AC$$. The refractive index of the liquid $$n = \dfrac{\sqrt{x}}{4}$$. The value of $$x$$ is ______. (Given refractive index of glass $$= 1.5$$)

Two lighter nuclei combine to form a comparatively heavier nucleus by the relation given below:
$$_1^2X + _1^2X = _2^4Y$$
The binding energies per nucleon of $$_1^2X$$ and $$_2^4Y$$ are $$1.1 \text{ MeV}$$ and $$7.6 \text{ MeV}$$ respectively. The energy released in this process is ______ MeV.

The typical transfer characteristic of a transistor in CE configuration is shown in figure. A load resistor of $$2 \text{ k}\Omega$$ is connected in the collector branch of the circuit used. The input resistance of the transistor is $$0.50 \text{ k}\Omega$$. The voltage gain of the transistor is ______.