JEE Main entrance exam Question Bank Solutions for Physics (JEE Main)

The equation λ = `1.227/"x"` nm can be used to find the de Brogli wavelength of an electron. In this equation x stands for:

Where,

m = mass of electron

P = momentum of electron

K = Kinetic energy of electron

V = Accelerating potential in volts for electron

The ratio of wavelengths of proton and deuteron accelerated by potential V_p and V_d is 1 : `sqrt2`. Then, the ratio of V_p to V_d will be ______.

A particle of mass 4M at rest disintegrates into two particles of mass M and 3M respectively having non zero velocities. The ratio of de-Broglie wavelength of particle of mass M to that of mass 3M will be:

An electron of mass m_e, and a proton of mass m_p = 1836 m_e are moving with the same speed. The ratio of the de Broglie wavelength `lambda_"electron"/lambda_"proton"` will be:

For which of the following particles will it be most difficult to experimentally verify the de-Broglie relationship?

In a Frank-Hertz experiment, an electron of energy 5.6 eV passes through mercury vapour and emerges with an energy 0.7 eV. The minimum wavelength of photons emitted by mercury atoms is close to ______.

A logic gate circuit has two inputs A and B and output Y. The voltage waveforms of A, B and Y are shown below.

The logic gate circuit is ______.

Which of the following gives a reversible operation?

Which one of the following is the Boolean expression for NOR gate?

A TV transmission tower has a height of 140 m and the height of the receiving antenna is 40 m. What is the maximum distance upto which signals can be broadcasted from this tower in LOS (Line of Sight) mode? (Given: radius of earth = 6.4 × 10⁶ m).

The bulk modulus of a liquid is 3 × 10¹⁰ Nm^-2. The pressure required to reduce the volume of liquid by 2% is ______.

A solid sphere of radius r made of a soft material of bulk modulus K is surrounded by a liquid in a cylindrical container. A massless piston of the area floats on the surface of the liquid, covering the entire cross-section of the cylindrical container. When a mass m is placed on the surface of the piston to compress the liquid, the fractional decrement in the radius of the sphere `((dr)/r)`, is ______.

The normal density of a material is ρ and its bulk modulus of elasticity is K. The magnitude of the increase in density of the material, when a pressure P is applied uniformly on all sides, will be ______.

The pressure P₁ and density d₁ of diatomic gas `(ϒ = 7/5)` changes suddenly to P₂(> P₁) and d₂ respectively during an adiabatic process. The temperature of the gas increases and becomes ______ times of its initial temperature.

`("given"  d_2/d_1 = 32)`

A monoatomic gas at pressure P and volume V is suddenly compressed to one eights of its original volume. The final pressure at constant entropy will be ______.

The speed of light in media 'A' and 'B' are 2.0 × 10¹⁰ cm/s and 1.5 × 10¹⁰ cm/s respectively. A ray of light enters from medium B to A at an incident angle 'θ'. If the ray suffers total internal reflection, then ______.

A cell E₁ of emf 6 V and internal resistance 2 Ω is connected with another cell E₂ of emf 4 V and internal resistance 8 Ω (as shown in the figure). The potential difference across points X and Y is ______.

An object viewed from a near point distance of 25 cm, using a microscopic lens with magnification '6', gives an unresolved image. A resolved image is observed at infinite distance with a total magnification double the earlier using an eyepiece along with the given lens and a tube of length 0.6 m, if the focal length of the eyepiece is equal to ______ cm.

A particle is oscillating according to the equation X = 7 cos 0.5 πt, where 't' is in second. The point moves from the position of equilibrium to maximum displacement in time:

A battery of EMF 10V sets up a current of 1A when connected across a resistor of 8Ω. If the resistor is shunted by another 8Ω resistor, what would be the current in the circuit? (in A)