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NEET - 6 - Physics
Quiz by Deepa Dhamnani
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​Three identical spherical shells, each of mass m and radius r are placed as shown in the figure. Consider an axis XX’ which is touching the two shells and passing through diameter of the third shell. Moment of inertia of the system consisting of these three spherical shells about XX’ axis is:
mr2
16/5Â mr2
11/5 mr2
4mr2
For an object thrown at 450 with horizontal, the maximum height (H) and horizontal range (R) are related as
Three identical spherical shells, each of mass m and radius r are placed as shown in the figure. Consider an axis XX’ which is touching the two shells and passing through diameter of the third shell. Moment of inertia of the system consisting of these three spherical shells about XX’ axis is:
Two coils of self inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is
22g of carbon dioxide at 270 C is mixed in a closed container with 16g of oxygen at 370 C . If both gases are considered as ideal gases, then the temperature of the mixture is
If the length of rod A is (3.25 + 0.01) cm and that of B is (4.19 + 0.01) cm , then the rod B is longer than rod A by
The luminosity of the Rigel star is 17000 times that of the sun. Assume both to be perfectly black bodies. If the surface temperature of the sun is 6000K, then the temperature of the star is around (Take 17000¼ = 11.4 )
Two slits S1 and S2 illuminated by a white light source give a white central maxima. A transparent sheet of refractive index 1.25 and thickness t1 is placed in front of S1 . Another transparent sheet of refractive index 1.50 and thickness t2Â is placed in front of S2 . If central maxima is not affected, then the ratio t1Â : t2 will be
De-Broglie wavelength of an electron accelerated by a voltage of 50V is close toÂ
(|e| = 1.6 x 10-19Â C, m6 =9.1 x 10-31Â kg, h=6.6 x 10-34 J s)
In p-type semiconductor the majority and minority charge carriers are respectively
Two long parallel conductors are placed at right angles to a metre scale at the 2 cm and 6 cm marks as shown in the figure......They carry currents of 1A and 3A respectively. They will produce zero magnetic field at (ignore earth’s magnetic field)
The amplitude of the two waves is in ratio 5 : 2. If all other conditions for the two waves are same, then what is the ratio of their energy densitites?
The potential difference between A and B in the following figure is
A particle undergoes uniform circular motion. About which point on the plane of the circle will the angular momentum of the particle remains conserved?
Charge Q, 2Q and –Q are given to three concentric conducting spherical shells A, B and C respectively, as shown in the figure. The ratio of charges on the inner and outer surface of the shell C will be
A container with insulating walls is divided into two equal parts by a partition fitted with a valve. One part is filled with an ideal gas at pressure p and temperature T, whereas the other part is completely evacuated. If the valve is suddenly opened, the pressure and temperature of the gas will be
A man running at a speed of 5km/h finds that the rain is falling vertically. When he stops running, he finds that the rain is falling at an angle of 600 with the horizontal. The velocity of rain with respect to running man is
The length of a wire of a potentiometer is 100 cm and the emf of its standard cell is E volt. It is employed to measured emf of a battery whose internal resistance is 0.5 Ω . If the balance point is obtained at 1 = 30 cm from the positive end, the emf of the battery is
Uranium -238 decays to Thorium -234 with half-life 5 x 109 yr. The resulting nucleus is in the excited state and hence further emits γ -rays to come to the ground state. It emits 20 γ -rays per second. The emission rate will drop to 5 γ -rays per second in
A circular coil of 100 turns and effective diameter 20 cm carries a current of 0.5A. It is to be turned in a magnetic field of B = 2T from a position in which the normal to the plane of the coil making an angle θ with magnetic field changes from θ = 00 to θ =1800 . The work required in this process is
A mixture consists of two radioactive materials A1 and A2 with half-lives of 20s and 10s respectively. Initially, the mixture has 40g of A1 and 160g of A2. The amount of the two in the mixture will become equal after
In Young’s double-slit experiment, d = 0.1 mm, D = 20 cm, and λ = 5460 A0 , the angular position of first dark fringe will be
Positively charged particles are projected into a magnetic field. If the direction of the magnetic field is along the direction of motion of the charged particles, the particles get
To send 10% of the main current through a moving coil galvanometer of resistance 9Ω , shunt S required is
A smooth steel ball strikes a fixed smooth steel plate at an angle θ with the vertical. If the coefficient of restitution is e, the angle at which the re-bounce will take place:
A coil of circular cross-section having 1000 turns and 4 cm2 face area is placed with its axis parallel to a magnetic field which decreases by 10-2Â Wbm-2 in 0.01s. The e.m.f. induced in the coil is:
The mirror in the blow case is
A stone is projected vertically upward to reach maximum height h. The ratio of its kinetic energy to its potential energy at a height 4/5h, will be
A force given by F = fxi + fyj + fzk acts on a particle which moves from (a, b, c) to (d, e, f). The work done by the force F is: (Here A1, A2, A3 are magnitude of area bounded)
The identical square rods of metal are welded end to end as shown in (a) figure, Q cal of heat flow through this combination in 4 min. If the rods were welded as shown in the figure (b), then same amount of heat will flow through the combination in:
Identify the gate and match A, B, Y in the bracket to check.
A particle of mass m is projected upwards with velocity v=ve /2, where ve is the escape velocity then at the maximum height the potential energy of the particle is: (R is radius of earth and M is mass of earth)
A particle moves in a circle of radius 0.5m at a speed that uniformly increases. Find the angular acceleration of a particle if its speed changes from 2 m/s to 4 m/s in 4 seconds?
1 gm of water at 1000CÂ is completely converted into steam at 1000CÂ . 1 m steam occupies a volume of 1650 cc. (Neglect the volume of 1 gm of water at 1000C ). At the pressure of 105Â N / m2Â , latent heat of steam is 540 cal/gm (1 calorie = 4.2 Joule). The increase in the internal energy in Joules is
A simple pendulum consisting of a mss M attached in a string of length L is released from rest at an angle α . A pin is located at a distance l below the pivot point. When the pendulum swings down, the string hits the pin as shown in the figure. The maximum angle θ which string makes with the vertical after hitting the pin is
The ends of stretched wire of length L are fixed at x = 0 and x = L. In one experiment the displacement of the wire is y1 = Asin (π x / L) sin ωt and energy is E1 and in other experiment its displacement is y2 = Asin (2 πx / L)sin 2 ωt and energy is E2 . Then
Kmax (ineV )Â = 3 , and frequency of light (in Hz) = 1 x 1015 for a metal used as a cathode in a photoelectric experiment. The threshold frequency of light for the photoelectric emission from the metal is
A capacitance of 2 μF is required in an electrical circuit across a potential difference of 1.0 kV. A large number of 1 μF capacitors are available which can withstand a potential difference of not more than 300V. The minimum number of capacitors required to achieve this is:
A rocket of mass 4000 kg is set for vertical firing. How much fuel must be consumed per second so that the rocket may have initial upwards acceleration of magnitude 19.6 m / s2 . [Exhaust gases speed = 980 m/s]
1 mole of a gas with γ = 7/5 is mixed with 1 mole of a gas γ = 5/3, then the value of γ for the resulting mixture is
An electromagnetic wave of frequency 1 x 1014 Hz is propagating along z-axis. The amplitude of the electric field is 4 V/m. If ∊0 = 8.8 x 10-12C2 / N - m2 , then the average energy density of electricfield will be
The algebraic sum of two co-initial vectors is 16 units. Their vector sum is 8 units and the resultant of the vectors are perpendicular to the smaller vector. Then magnitudes of the two vectors are
In a Young’s double slit experiment, slits are separated by 0.5 mm, and the screen is placed 150 cm away. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes on the screen. The lest distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide is:
Terminal speed of 2 cm radius ball in a viscous liquid is 20 cms-1 . Then the speed of 1 cm radius ball in the same liquid is
In a pond of water, a flame is held 3m above the surface of the water. A fish is at depth of 4 m from the water surface. Refractive index of water is 4/3. The apparent height of the flame from the eyes of fish is-
A particle is projected with velocity v0 along x-axis. The deceleration on the particle is proportional to the square of the distance from the origin i.e., a = -x2. The distance at which particle stops is