NEET Physics Class 11 Questions

If a wave gets refracted into a denser medium, then which of the following is true?

Taking the Bohr radius as a₀ = 53 pm, the radius of Li⁺⁺ ion in its ground state, on the basis of Bohr’s model, will be about

If the unit of force is 100 N, unit of length is 10 m and unit of time is 100 s, what is the unit of mass in this system of units?

A steel rail of length 5 m and area of cross section 40 cm² is prevented from expanding along its length while the temperature rises by 10°C. If coefficient of linear expansion and Young's modulus of steel are 1.2 × 10⁻⁵ K⁻¹ and 2 × 10¹¹ Nm⁻² respectively, the force developed in the rail is approximately:

A truck and a car moving with the same kinetic energy are brought to rest by the application of brakes which provide equal retarding forces. Which of them will come to rest in a shorter distance?

In a linear simple harmonic motion (SHM) (A) Restoring force is directly proportional to the displacement. (B) The acceleration and displacement are opposite in direction. (C) The velocity is maximum at mean position. (D) The acceleration is minimum at extreme points. Choose the correct answer from the options given below:

If a gas is compressed adiabatically by doing work of 150 J the change in internal energy of the gas is

The stress-strain graph for a metal wire is as shown in the figure. In the graph, the region in which elasticity is maintained the ultimate strength and fracture points are represented by

If the frequency of human heart is 1.25 Hz, the number of heart beats in 1 minute is

The pressure of a gas changes linearly with volume from A to B as shown in figure. If no heat is supplied to or extracted from the gas then change in the internal energy of the gas will be

How much mass has to be converted into energy to produce electric power of 500 MW for one hour?

A particle executing simple harmonic motion with time period T. The time period with which its kinetic energy oscillates is

The volume thermal expansion coefficient of an ideal gas at constant pressure is directly proportional to (Here T = absolute temperature of gas)

Which of the following options are correct?

The maximum load a wire can withstand without breaking, when its length is reduced to half of its original length, will

With increase in temperature, the viscosity of

What is the ratio of the shortest wavelength of the Balmer series to the shortest wavelength of the Lyman series?

Figures (a), (b), (c) and (d) show variation of force with time. The impulse is highest in figure.

Identify the correct statements from the following: (A) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket is negative. (B) Work done by gravitational force in lifting a bucket out of a well by a rope tied to the bucket is negative. (C) Work done by friction on a body sliding down an inclined plane is positive. (D) Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity in zero.

When a conservative force does positive work on a body

If a graph is plotted between T² and r³ for a planet, then its slope will be (where Ms is the mass of the sun)

The power radiated by a black body is P and it radiates maximum energy at wavelength \( \lambda_0 \). If the temperature of the black body is now changed so that it radiates maximum energy at wavelength \( 3\lambda_0 \), the power radiated by it becomes nP. The value of n is:

A pipe open at both ends has fundamental frequency f in air. The pipe is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now

Which one of the following is \( \nu_m - T \) graph for perfectly black body? \( \nu_m \) is the frequency of radiation with maximum intensity. T is the absolute temperature.

Two planets A and B of radii R and 1.5 R have densities ρ and ρ/2 respectively. The ratio of acceleration due to gravity at the surface of B to A is :

The total energy of the body executing S.H.M. is E. Then the kinetic energy when the displacement is half of the amplitude, is

The percentage decrease in the weight of a rocket, when taken to a height of 32 km above the surface of earth will be : (Radius of earth = 6400 km)

The value of \( \gamma = \frac{C_p}{C_v} \), for hydrogen, helium and another ideal diatomic gas X (whose molecules are not rigid but have an additional vibrational mode), are respectively equal to

The temperature of a gas is –50°C. To what temperature the gas should be heated so that the rms speed is increased by 3 times?

In thermodynamics, heat and work are:

Two blocks each of mass m is connected to the spring of spring constant k as shown in the figure. If the blocks are displaced slightly in opposite directions and released, they will execute simple harmonic motion. The time period of oscillation is

The distance of Neptune and Saturn from the sun is nearly 10¹³ and 10¹² meter respectively. Assuming that they move in circular orbits, their periodic times will be in the ratio

During an isothermal expansion of an ideal gas

A sample of gas is at 0°C. To what temperature it must be raised in order to double the r.m.s. speed of the molecule

The phase difference between oscillatory motion of two points separated by a distance of \( \frac{\lambda}{2} \) is (where \( \lambda \) is the wavelength)

A particle acted upon by constant forces 4î + ĵ − 3k̂ and 3î + ĵ − k̂ is displaced from the point î + 2ĵ + k̂ to point 5î + 4ĵ + k̂. The total work done by the forces in SI unit is

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. Choose the correct answer from the options given below:

A string fixed at its both ends vibrates in 5 loops as shown in the figure. The total number of nodes and antinodes are respectively

A trolley of mass 20 kg is attached to a block of mass 4 kg by a massless string passing over a frictionless pulley as shown in the figure. If the coefficient of kinetic friction between trolley and the surface is 0.02, then the acceleration of the trolley and block system is (Take g = 10 m s⁻²)

A body with mass 5 kg is acted upon by a force F = (−3î + 4ĵ)N. If its initial velocity at t = 0 is v = (6î − 12ĵ) ms⁻¹, the time at which it will just have a velocity along the Y⁻axis is

The escape velocity of a planet having mass 6 times and radius 2 times as that of earth is

1 kilowatt hour (kWh) is equal to

Inside a uniform spherical shell :

A particle executing SHM according to the equation \( x = 5 \cos \left( 2\pi t + \frac{\pi}{4} \right) \) in SI units. The displacement and acceleration of the particle at \( t = 1.5 \) s is

When the elevator moves upward with constant acceleration

Two particles of mass 5 kg and 10 kg respectively are attached to the two ends of a rigid rod of length 1 m with negligible mass. The centre of mass of the system from the 5 kg particle is nearly at a distance of:

A body weighs 250 N on the surface of the Earth. How much will it weigh halfway down to the centre of the Earth?

The excess of pressure inside a soap bubble than that of the outer pressure is

The acceleration due to gravity at a height 1 km above the Earth is the same as at a depth d below the surface of Earth. Then

A square lead slab of side 50 cm and thickness 10 cm is subjected to a shearing force (on its narrow face) of 9 × 10⁴ N. The lower edge is riveted to the floor. How much will the upper edge be displaced? (Shear modulus of lead = 5.6 × 10⁹ N m⁻²)