NEET Mock Test - 29 - NEET MCQ

The threshold frequency for photo electric effect for a metal surface is found to be 4. 8 x 10¹⁶ H z . The stopping potential required when the metal is irradiated by radiation of frequency 5.6 x 10¹⁶ H z is (taking h = 6.6 x 10 ^{− 34} J sec and e = 1.6 x 10 ^{− 19} C)

Cream gets separated out of milk when it is churned, it is due to

We have two wires A and B of same mass and same material. The diameter of the wire A is half of that B. If the resistance of wire A is 24 ohm then the resistance of wire B will be

For a cell terminal potential difference is 2.2 V When circuit is open and reduces to 1.8 V when cell is connected to a resistance of R=5 Ω. Determine the internal resistance of the cell (r)

Photon of 5.5eV energy fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 4.0eV. The stopping voltage required for these electrons are

Which of the following statements is correct

In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become

Out of the folowing statement which is NOT true?

A loop of area 0.1 m² rotates with a speed of 60 rps perpendicualr to a magnetic field of 0.4 T. If there are 100 turns in the loop, maximum voltage induced in the loop is

Which of the following electromagnetic waves have the smallest wavelength?

The electric field intensity of the surface of a solid charged sphere of radius r and volume charge density ρ, is given by

The ratio of charge to potential of a capacitor is known as its

A black body has a wavelength of λ at temperature 2000 K. Its corresponding wavelength at temperature 3000 K will be

Radius of the earth is 6400 km. The radius of the orbit of a stationary satellite is about

At a given temperature the ratio of r.m.s. velocities of hydrogen molecule and helium atom will be

The vector sum of two forces is perpendicular to their vector differences. In that case, the forces

A galvanometer of resistance 100Ω gives full scale deflection, when 100 μA current is passed through it. If it is used as an ammeter by using a resistance of 0.1 Ω, then minimum value of current in the circuit so that ammeter gives full scale deflection now is,

If a diamagnetic solution is poured into a U-tube and one arm of this U-tube is placed between the poles of a strong magnet, with the meniscus in line with the field, then the level of solution will

The pole strength of a 12cm long bar magnet is 20 A-m. The magnetic induction at a point 10cm away from the centre of the magnet on its axial line is

A capillary tube when immersed vertically in a liquid records a rise of 3 mm. If the tube is immersed in the liquid at an angle of 60° with the vertical, then height of the liquid in the capillary tube will be

Two wires of same radius and length are subjected to the same load. One wire is of steel and the other is of copper. If Young's modulus of steel is twice that of copper, then ratio of elastic potential energies stored per unit volume in steel wire to that in copper wire is

The function of the moderator in a nuclear reactor is

The work done by a simple pendulum, in one complete oscillations, is

In a Rutherford scattering experiment when a projectile of charge z₁ and mass M₁ approaches a target nucleus of charge z₂ and mass M₂, the distance of closest approach is r₀. The energy of the projectile is:

The amount of energy released when one milligram of matter is annihilated is

A convex lens of focal length 0.5 m and concave lens of focal length 1 m are combined .The power of resulting lens will be

The refracting angle of a prism A is small. The correct statement for the dispersive power of a prism is that dispersive power