NEET Mock Test - 9 - NEET MCQ

If Planck's constant is given as 6.4 x 10 ^{− 34} J − sec, and electron charge is 1.6 x 10⁻¹⁹ coulomb, the minimum wave length of X - rays emitted, when a 10 KeV electron is completely stopped by a target is

In a given network, each resistance has value of 6 Ω. The point X is connected to point A by a copper wire of negligible resistance and point Y is connected to point B by the same wire. The effective resistance between X and Y will be

Two resistances are joined in parallel whose resultant is 6/8 ohm. One of the resistance wire is broken and the effective resistance becomes 2Ω. Then the resistance in ohm of the wire that got broken was

When yellow light incident on a surface no electrons are emitted while green light can emit. If red light is incident on the surface then

Which quantity is fixed of an object which moves in a horizontal circle at constant speed?

Who indirectly determined the mass of the electron by measuring the charge of the electron ?

Monochromatic light of frequency f incident on emitter having threshold frequency f₀. The kinetic energy of ejected electron will be

If the momentum of a photon is p, then its frequency is

A coil has 1000 turns and 500 cm² as its area. The plane of the coil is placed at right angles to a magnetic induction field of 2 x 10 ^{− 5} web ∕ m². The coil is rotated through 180° in 0.2 seconds. The average e.m.f. induced in the coil, in millivolts is

Maxwell's equation describe the fundamental laws of

The difference between soft and hard X-rays is

The capacitance of an isolated spherical conductor of radius 15 cm is

There is a uniform electric field of strength 10³v/m along y axis.A body of mass 1gm and charge 10^-6C is projected into the field from origin along the positive x-axis with a velocity 10m/s.Its speed in m/s after 10s is (neglect air resistance)

If the radius of the earth were to shrink by 1% its mass remaining same, the acceleration due to gravity on the earth's surface would

Mode of transmission of heat, in which heat is carried by the moving particles, is

The root mean square velocity of hydrogen molecules at 300 K is 1930 m/s. Then the r.m.s. velocity of oxygen molecules at 1200 K will be

A block of mass 10 kg is placed on a rough horizontal surface having coefficient of friction μ = 0.5. If a horizontal force of 100 N is acting on it, then acceleration of the block will be (Take g = 10 m−s⁻²)

Two concentric circular coils of ten turns each are situated in the same plane. Their radii are 20 cm and 40 cm and they carry respectively 0.2 A and 0.3 A current in opposite direction. The magnetic field in telsa at the centre is

When 2 A current is passed through the coil of a tangent galvanometer, it gives a deflection of 45°. For 60° deflection, the current must be

A wire of length 2 m carrying a current of 1 A is bent to form a circle, the magnetic moment of the coil is

The surface tension of soap solution is 25x10⁻³ N-m⁻¹. The excess pressure inside a soap bubble of diameter 1 cm is

Which of the following affets the elasticity of a substance?

In carbon cycle of fusion

After two hours, 1/16 of the initial amount of a certain radioactive isotope remains undecayed. The half life of the isotope is

A particle is having kinetic energy 1/3 of the maximum value at a distance of 4 cm from the mean position. Find the amplitude of motion

Two radioactive substances A and B have decay constants 5 λ and λ respectively. At t = 0 they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be (1/e)² after a time interval

A ray is incident on an equilateral prism of μ = 2 such that ray inside the prism goes parallel to the base. Find angle of minimum deviation?