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NTA NEET MOCK TEST – 5 PHYSICS
Quiz by Vaijayanthi Pillai
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After a perfectly inelastic collision between two identical particles which were moving with the same speed in different directions, the speed of the particles become half the initial speed.The angle between the velocities of the two particles before collision is
The wavelength corresponding to the maximum energy, released during an atomic explosion was 2.93x 10-10m . Given that the wien’s constant b= 2.93 x10-3 m K ,then the maximum temperature attained must be of the order of
A bob of mass m is tied with a thread and is made to move in a circular path on a horizontal frictionless table about point O as shown in the figure. A hypothetical electric field exists in the radial direction along the surface of the table. In this condition, the bob is uncharged and the tension in the threads is T. If now the bob is given some charge, then
Consider the situation show in the figure. The wall is smooth but the surfaces of blocks A and B in contact are rough. The friction on A due to B in equilibrium
An engine is attached to a wagon through a shock absorber of length 1.5m. The entire system with a total mass of 5000 kg was moving with a speed of 36 1 kmh , when the brakes are applied to bring it to rest. In this process, the spring of the shock absorber gets compressed by 1.0m, if 90% of the energy of the wagon is lost due to friction, the spring constant is
If R1 and R2 are the resistance of the filaments of 200W and 100 W electric bubs operated at 220V, then R 1/ R2 is
If N0 is the initial mass of a substance with half-life t1/2 =5 years, then the amount of substance left after 15 years in
A block of mass 2 kg is attached to the spring of spring constant 50 N/m. The block is pulled to a distance of 5 cm from its equilibrium position (at x = 0) on a horizontal frictionless surface and released at t = 0 from rest. The expression for its displacement at anytime t is
Two coherent point sources S1 and S2 are separated by a small distance d as shown in the figure. The fringes obtained on the screen will be
In the figure shown below, an ideal gas is carried around the cyclic process. How much work is done in one cycle if P0 =8 atm and V0 =7.00 litre?
One-litre of oxygen at a pressure of 1 atm and two-litre of nitrogen at a pressure of 0.5 atm, are introduced into a vessel of volume one-litre. If there is no change in temperature, the final pressure of the mixture of the gases [in atm) is
A coil having 200 turns has a surface area of 0.15 m2 . A magnetic field applied perpendicular to the coil changes from 0.2 T to 0.6 T in 0.4 s, then the induced emf [in V] is
A sound wave of frequency f propagating through the air with a velocity c, is reflected from a wall which is moving away from the stationary source with a constant speed v. The frequency of the reflected wave, measured by the observer at the position of the source is
A boy and a man carry a uniform rod of length L, horizontally in such a way that the boy gets 1/4th of the load. If the boy is at one end of the rod, the distance of the man from the other end is
A body is dropped from a certain height above the surface of the earth. When it loses U amount of its potential energy, it acquires a velocity v. The mass of the body is
The dimensional formula for the magnetic field is
Two particles are projected simultaneously in the same vertical plane, from the same point, but with different speeds and at different angles with horizontal. The path followed by one, as seen by the other is
The diagram of a logic circuits is given below. The output A of the circuit is represented by
The instantaneous current and voltage of an AC circuit are given by i =10sin(314t)AandV =100sin(314t)V What is the power dissipation in the circuit?
An object is approaching a thin convex lens of focal length 0.3 m with a speed of 0.01 m/s. The magnitude of the rate of change of lateral magnification of image when the object is at a distance of 0.4m from the lens is
A wire of natural length l , Young’s modulus Y and area of cross-section A is extended by x . Then the energy stored in the wire is given by
A copper disc of the radius 0.1m is rotated about its centre with 20 revolutions per second in a uniform magnetic field of 0.1 T with its plane perpendicular to the field. The emf induced across the radius of the disc is
Figure shows the acceleration – time graphs of a particle. Which of the following represents the corresponding velocity time graph?
A given quantity of an ideal gas is at the pressure P and the absolute temperature T. The isothermal bulk modulus of the gas is
The radiation emitted by a star A is 10,000 time that of the sun. If the surface temperature of the sun and the star A are 8000K and 2000K respectively. the ration of the radii of the star A and the sun i
How many times larger is the spacing between the energy levels with n = 3 and n= 4 than the spacing between the energy levels with n = 8 and n = 9 for a hydrogen like atom or iron?
In the following, which one of the diodes is reverse biased?
A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth’s horizontal magnetic field of 24 microtesla. When horizontal field 18 microtesla is produced opposite to the earth’s field by placing a current carrying wire, the new time period of the magnet will be
Three cells of emf 1 V and internal resistance 1 each are connected as shown. Effective emf of combination between the points P and Q is
An elevator is going upward and the variation in the velocity of the elevator is as given in the graph. What is the height of which the elevator takes the passengers?
When the angle of incidence on a material is 60 0 , the reflected light is completely polarized. The velocity of the refracted ray inside the material is 1 (in ms -1
When monochromatic radiation of intensity I falls on a metal surface, the number of photoelectrons and their maximum kinetic energy are N and T respectively. If the intensity of radiation is 2I, the number of emitted electrons and their maximum kinetic energy are respectively
A transformer of efficiency 90% has turns ratio 10 : 1. If the voltage across the primary is 220V and current in the primary is 0.5A, then the current in secondary is
Three particles start from the origin at the same time, one with a velocity v1 along the x-axis, second along the negative y-axis with v2 and the third particle moves along the line x = y. The velocity of third particle, so that three may always lie on the same line is:
A laser beam is sent to the moon and reflected back to earth by a mirror placed on the moon by an astronaut. If the moon is at 3,84,000 km distance from earth, how long does it take the light to make the round trip?
The wheel of a toy car rotates about an axis on the rough surface. Its angular frequency slows down from 400 rps to 200 rps in 2 s. Then its angular retardation in rad s -2 is
An electron having kinetic energy 10 eV is circulating in a path of radius 0.1 m in an external magnetic field of intensity 10-4 T. The speed of the electron will be
A convec lens is immersed in a liquid, whose refractive index is equal to the refractive index of the material of the lens. Then its focal length will
Two bodies of masses 10 kg and 100 kg are separated by a distance of 2m. The gravitational potential at the mid-point of the line joining the two bodies is