AIIMS Physics Mock Test - 10 - NEET MCQ

The weight of a man in a lift moving upward is 608N while the weight of the same man in the lift moving downwards with the same acceleration is 368N. His normal weight in newtons is

Monochromatic X - rays of wavelength 0 . 124 Å undergo compton scattering through an angle 60 º from a carbon block. The wavelength of the scatterted X - rays in Å , is

The energy required to charge a parallel plate condenser of plate separation d and plate area of cross-section A such that the uniform electric field between the plates is E, is

The work functions for sodium and copper are 2 eV and 4 eV. Which of them is suitable for a photocell with 4000Å light

When ultraviolet rays are incident on a metal plate, then the photoelectric effect does not occurs. It occurs by the incidence of

Consider the following statements regarding the properties of X-rays and electrons :(I) Both ionise gases (II) Both are deflected by electric and magnetic fields (III) Both cause fluorescence in some substances (IV) Both affect the photographic plate. Which of the above statements are correct ?

The ratio of secondary to the primary turns in a transformer is 3 : 2. If the power output be P, then the input power, neglecting all losses, must be equal to

Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon

In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor, when the energy is stored equally between the electric and magnetic field is

The switch in the circuit to the right is initially open. It is closed at time t = 0. Which of the following statements is false?

Which scientist experimentally proved the existance of electromagnetic waves?

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

The region between two concentric spheres of radii R₁ and R₂ includes a volume charge density given by ρ = a r where a is a constant and r is the distance from the centre. There is a charge Q located at the centre. The value of a for which the region R 1 ≤ r ≤ R 2 has a constant electric field intensity is

A body of mass 2 kg is projected vertically upwards with a velocity of 2 m sec⁻¹. The K.E. of the body just before striking the ground is

A long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be

A black body, at a temprature of 227ºC, radiates heat at a rate of 20 cal m⁻²s⁻¹. When its temperature is raised to 727ºthe heat radiated by it in cal m⁻²s⁻¹ will be closest to

The resistance of two bulbs of the same voltage are in the ratio 1:2. On connecting them in parallel the power consumption will be in the ratio

The magnetic lines of force inside a bar magnet

Isogonic lines are those for which

A wire can be broken by applying a load of 200 N.The force required to break another wire of the same length and same material, but double in diameter, is

In the above question, the impulse acting on the object is

Cobalt = 60 has half life of 5.3 years. The time taken for 7/8 of the original sample to disintegrate will be-

A simple pendulum of length 'l' has a maximum angular displacement (θ). The energy of a bob of mass m at the end of the displacement is

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Thomson's method of determining e m of positive rays, a parabola is obtained on the screen.
Reason(R): Electric field e and magnetic field B are kept parallel to each other.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Pressure of a gas in a discharge tube for the production of cathode rays is of the order of 10^-1mm of mercury.
Reason(R): At very low pressure, the number of atoms will be too small.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The centre of mass of an extended object is that point on the object where the resultant of all the external forces acting on the body acts.
Reason(R) : An object under the effect of several external forces moves as if it were a particle placed at its centre of mass and all forces transferred to the point.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The slope of work-time graph gives instantaneous power.
Reason(R): Instantaneous power is dot product of force and displacement.