NEET Mock Test - 32 - NEET MCQ

An X - ray tube is operated at a constant potential difference and it is required to get X - ray of wavelength not less then 0.2 nano-metres. Then the potential difference in kilo-volts is [h = 6.63 x 10⁻³⁴ J-sec ; e = 1.6 x 10⁻¹⁹ C ; c = 3 x 10⁸ ms⁻¹]

The potential difference between the terminals of a cell in open circuit is 2.2 volts. With resistance of 5 ohm across the terminals of a cell, the terminal potential difference is 1.8 volt. The internal resistance of the cell is

Two wires of the same material are given. The first wire is twice as long as the second and has twice the diameter of the second. The resistance of the first will be

A particle of mass m moves with constant speed along a circular path of radius r under the action of force F. Its speed is

In photo electric effect the stopping potential is

An electron of charge 'e' coulomb passes through a potential difference of V volts. Its energy in 'joules' will be

The energy of a photon of light with wavelength 5000Å is approximately 2.5eV. This way the energy of an X-ray photon with wavelength 1Å would be

During X-ray formation if voltage is increased

A bar magnet is released into a copper ring which is directly below it. What about the acceleration of the magnet?

The pressure exerted by an electromegnetic wave of intensity I on a non-reflecting surface is (where c = Velocity of light)

Heat radiations propagate with the speed of

The capacity of a condenser with two identical plates separated by a distance 'd' in air is 'C'. If the distance of separation is reduced to d/2 , the capacity is

If the distance between the plates of a parallel plate condenser is halved and the dielectric is doubled, then its capacity increases by

Which of the following is the example of ideal black body

The value of g on the moon is 1/6th that on earth. A body weighing 60 kg on the earth, has weight on the moon

The factor not needed to calculate heat lost or gained when there is no change of state, is

A cyclist moving with a speed of 4.9 m−s⁻¹ on a level road can take a sharp circular turn. The coefficient of friction between the cycle tyres and road is 0.5, then radius of the turn is

A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction in such a way that its axis makes an angle of . The magnetic flux linked with the disc is

Relative permittivity and permeability of a material are ℇ_r and μ_r , respectively . Which of the following values of these quantities are allowed for a diamagnetic material ?

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show

The extension in a string, obeying the Hooke's law, is x. The speed of sound in the stretched string is v. If the string is extended to 1.5 x, then speed of sound will be

The radio - isotope of this element is used in the treatment of cancer

A capillary tube (A) is dipped in water . Another identical tube (B) is dipped in a soap water solution . Which of the following shows the relative nature of the liquid columns in two tubes ?

In a nuclear reactor the excess reactivity can be controlled by using ---- rods

When two deuterium nuclei fuse together, in addition to tritium, we get a

Time period of a simple pendulum of length l is T₁ and time period of a uniform rod of the same length l pivoted about one end and oscillating in a vertical plane is T₂. Amplitude of oscillations in both the cases is small. Then T₁/T₂ is

With respect to air, critical angle in a medium for light of red colour [λ₁] is θ. Other facts remaining same, critical angle for light of yellow colour [λ₂] will be