AIIMS Physics Mock Test - 1 - NEET MCQ

A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragements with equal masses fly in mutually perpendicular directions with speeds of 21 m/sec. The velocity of the heaviest fragment will be

A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are

de-Broglie hypothesis treated electrons as

Gases begin to conduct electricity at low pressure because

In a discharge tube at 0.02 mm, there is formation of

The effective value of a.c. in a circuit is 10 A. The peak value of current is

A coil of inductances 300mH and resistance 2 Ω is connected to a source of voltage 2V. The current reaches half of its steady state value in

On increaing the number of electrons striking the anode of an X-ray tube, which one of the following parameters of the resulting X-ray would increase

A generator at a utility company produces 100 A of current at 4000 V. The voltage is stepped up to 240000 V by a transformer before it is sent on a high voltage transmission line. The current in transmission line is

If the current is halved in a coil, then the energy stored is how much times the previous value

Which rays are not the portion of electro magnetic spectrum?

A conducting sphere of radius 10 cm is charged with 10 μC. Another uncharged sphere of radius 20 cm in allowed to touch it for some time. If both the spheres are separated, then surface density of charges on the spheres will be in the ratio of

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

If the K.E of a particle is doubled, then its momentum will

At a common temperture, a block of wood and a block of metal feel equally cold or hot. The temperatures of block of wood and block of metal are

A wire of resistance 20 Ω is covered with ice and a voltage of 210 V is applied across the wire, then rate of melting the ice is

A magnetic needle suspended freely orients itself

In Fig. 16.38, a third point charge -q is placed at point P. What is the electric force on -q due to the other two point charges?

A magnetic needle is kept in a non-uniform magnetic field. It experiences

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 bomb of mass 9 kg explodes into two pieces of masses 3kg and 6kg. The velocity of 3kg mass is 16m/s . The K.E of 6kg mass is

Which of the following is used as neutron absorber in the nuclear reactor?

A simple harmonic motion is represented by :y = 10 sin (20 t + 0.5). The amplitude of this motion 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): Hollow prism forms no spectra as a solid equilateral prism of glass.
Reason(R): Neglecting the thickness of the hollow glass surface, the media is same. So dispersion is not to take place.

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): We cannot think of a magnetic configuration with three poles.
Reason(R): A bar magnet does exert a torque on itself due to its own field.

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): Surface area of a drop of liquid reduces to reduce energy.
Reason(R): Molecules on the surface of a drop have more energy than the molecules in the interior.

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 laser beam of 0.2 W can drill holes through a metal sheet whereas a 1000 W torch light cannot.
Reason (R): The frequency of laser is much higher than torch light.