AIIMS Physics Mock Test - 6

A charged particle is released from rest in a region of steady and uniform electric and magnetic fields which are parallel to each other. The particle will move in a

If momentum of a particle is doubled, then its de-Broglie's wavelength will

A certain piece of silver of given mass is to be made like a wire. Which of the following combinations of length (L) and the area of cross-section (A) will lead to the smallest resistance

A 2kg ball moving at 24 ms^-1 undergoes inelastic head-on collision with a 4 kg ball moving in the opposite direction at 48 ms^-1. If the coefficient of restitution is 2/3, their velocities in ms^-1 after impact are

Quantam nature of light is explained by which of the following phenomenon

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

The coil of a dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. The phenomenon can be correctly described as

Quantity that remains unchanged in a transformer is

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

What is the value of inductance L for which the current is a maximum in series LCR circuit with C = 10 μF and ω = 1000s⁻¹ ?

The maximum distance upto which TV transmission from a TV tower of height h can be received is propotional to

Which of the following represents the emf of a battery?

A parallel plate capacitor is made by stacking n equally spaced plates connected alternatively. If capacitance between any two adjacent plates is C, then the resultant capacitance is

A particle of mass m is moving in a horizontal circle of radius r under a centripetal force equal to - K/r², where K is a constant. The total energy of the particle is

If the unit of force and length be each increased by four times, then the unit of energy is increased by

At temprature T, the poewr radiated by a body is Q watts. At the temprature 3T the power radiated by it will be

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current, if it dissipates 22.5 W, the resistance of fuse wire will be

A bar magnet of pole strength 2 A-m is kept in a magnetic field of induction 4 x 10⁻⁵ wbm⁻² such that the axis of the magnet makes an angle 30º with the direction of the field. The couple acting on the magnet is found to be 80 10⁻⁷N-m . Then the distance between the poles of the magnet is

A bar magnet of magnetic moment M and length L is cut into two equal parts each of length L/2. The magnetic moment of each part will be

How much force is required to produce an elongation of 0.2% in the length of a brass wire of diameter 0.6 mm? (Take Young's modulus for brass = 0.9x10¹¹ N-m⁻²)

A body is imparted motion rest to move in a straight line. If it is then obstructed by an opposite force, then

Radioactive disintegration differs from a chemical change in being

Two springs of constants k₁ and k₂, have equal highest velocities, when executing SHM. Then, the ratio of their amplitudes (given their masses are eqaul) will be

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): Electrical resistivity of typical insulator (≃ 10¹⁴Ω-m) is about 10²² times that of metal (≃ 10^-8Ω-m) while in case of heat it is only about 10³ (as K_Ag ≃ 400 W/mk while K_glass ≃ 1 W/mk)
Reason(R): In electrical conduction only free electrons take part while in thermal conduction both lattice and free electrons contribute.

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): When light goes from a medium of refraction index 1.5 to a medium of refraction index , 1.6, its speed decreases by 1.875 x 10⁸ m/s.
Reason(R): Refraction index

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):A certain radioactive substance has a half life period of 30 days. Its disintegration is 0.0231 day.
Reason(R):Decay constant varies inversely as half life.

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): When net force is perpendicular to direction of velocity, it just changes its direction and not magnitude.
Reason (R): This results in uniform circular motion.

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): Orbiting satellite or body has K.E. of always less than that of Potential energy.
Reason(R): For any bound state, the magnitude of potential energy is always twice that of kinetic energy (K.E.)

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): In series LCR circuit, the resonance is equal and opposite to the capacitive reactance.
Reason (R): At resonance the inductive reactance is equal and opposite to the capacitive reactance.

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): Every oscillatory motion cannot be treated as simple harmonic, under small oscillation.
Reason(R): Even under larger oscillation restoring force should be proportional to displacement for being S.H.M.

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): When temperature of gas remains constant, speed of sound changes.
Reason(R) :   ( symbols have their usual meaning) 

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): A current carrying wire produces electric field.
Reason(R): The current in a wire is due to the flow of free electrons in a definite direction.

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): An excess charge placed on an insulated conductor resides entirely on its outer surface.
Reason(R) : The excess charge placed inside a conductor will set up electrical fields insides the conductor which set up internal currents.

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): Everybody will have natural tendency to remain at rest.
Reason(R): Force always acts in the direction of motion.

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): Force between two parallel current carrying conductors is always of attraction.
Reason(R): Force per unit length = (symbols have their usual meaning).

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 direction of deflection of canal rays is the same as that of a stream of positively charged particles.
Reason(R): Canal rays cause fluoroscence when incident on certain materials.

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 path of γ-rays in Wilson's chamber are very thin continuous lines.
Reason(R):γ-rays produce very little ionisation.

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): Neutrons can be accelerated by cyclotron.
Reason(R): Neutrons are too heavy.

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): Out of galvanometer, ammeter and voltmeter resistance of ammeter is lowest and resistance of voltmeter is highest.
Reason(R): An ammeter is connected in series and a voltmeter is connected in parallel in a circuit.

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.

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): A system of cylinder with non-accelerated motion of piston and larger temperature gradient is called a quasistatic process.
Reason(R) In quasi-static processes, the pressure and temperature of the surrounding and the cylinder are the same.

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): A charged particle undergoes non-rectilinear motion in a constant magnetic field. The only force acting on the particle is the magnetic force. Then kinetic energy of this particle remains constant but momentum of the particle changes.
Reason(R) : A force that always acts on the particle in direction perpendicular to its velocity does no work on the particle. But whenever a force acts on the particle, momentum of the particle changes.

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): There is a minimum wave-length below which no X-ray is emitted.
Reason(R): This wavelength depends on the material of the target.

An electric motor exerts a force of 40 N on a cable and pulls it by a distance of 30 m in one minute. The power supplied by the motor is

Two balls are projected making an angle of 30º and 45º respectively with the horizontal. If both have same velocity at the highest points of their paths, then the ratio of their velocities of projection is

The colour of light wave that travels with maximum speed in glass is

Band spectrum is formed due to

Red light is used as danger signal because it is

The typical ionisation energy of a donor in silicon is

The dominant contribution to current comes from holes in case of

Three equal resistors connected in series across a source of e.m.f. together dissipate 10 watt. If the same resistors are connected in parallel across the same e.m.f., then the power dissipated will be

The unit of gravitational constant is

'Parsec' is the unit of

In a biprism expt., by using light of wavelength 5000 Å, 5 mm wide fringes are obtained on a screen 1.0 m away from coherent sources. The separation between two coherent sources is

In a Young's experiment, two coherent sources are placed 0.90 mm apart and the fringes are observed one metre away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of monochromatic light used would be

In Young's double slit interference experiment the wavelength of light used is 6000 Å . If the path difference between waves reaching a point P on the screen is 1.5 microns, then at that point P

A cord is used to lower vertically a block of mass M by a distance d with constant downward acceleration g/4. Work done by the cord on the block is