Your Target is to secure Good Rank in NEET - 2020

Important Instructions:

(1) There is only one correct option.

(2) Duration of Test is 1 Hour and Questions Paper Contains 45 Questions. The Max. Marks are 180.

(3) Each correct answer carries 4 marks, while 1 mark will be deducted for every wrong answer. Guessing of answer reduces your effort. 

1 / 45

In Young’s double-slit experiment, the separation between the slits is halved and the distance between the slits and the screen is doubled. The fringe width is

2 / 45

In A.C. circuit in which inductance and capacitance are joined in series, current is found to be maximum when the value of inductance is 0.5 H and the value of capacitance is 8 μF. The angular frequency of applied alternating voltage will be

3 / 45

One end of uniform wire of length L and of weight W is attached rigidly to a point in the roof and a weight W1 is suspended from its lower end. If s is the area of cross section of the wire, the stress in the wire at a height 3L/4  from its lower end is

4 / 45

Figure shows a small mass connected to a string, which is attached to a vertical post. If the ball is released when the string is horizontal as shown, the magnitude of the total acceleration of the mass as a function of the angle q is:

5 / 45

A cylindrical block of area of cross-section A and of material of density r is placed in a liquid of density one-third of density of block. The block compresses a spring and compression in the spring is one-third of the length of the block. If acceleration due to gravity is g, the spring constant of the spring is

6 / 45

A point charge of magnitude + 1 μC is fixed at (0, 0, 0). An isolated uncharged spherical conductor, is fixed with its center at (4, 0, 0). The potential and the induced electric field at the centre of the sphere is :

7 / 45

The moment of inertia of a regular circular disc of mass 0.4 kg and radius 100 cm about the axis perpendicular to the plane of the disc and passing through its centre is

8 / 45

10 g of ice at 0ºC is mixed with 100 g of water at 50ºC. What is the resultant temperature of mixture?

9 / 45

The displacement vs time of a particle executing SHM is shown in figure. The initial phase Φ

10 / 45

Two equal masses m1 and m2 moving along the same straight line with velocities + 3 m/s and – 5m/s respectively, collide elastically. Their velocities after the collision will be respectively

11 / 45

The graph (fig.) below describes the motion of a ball rebounding from a horizontal surface being released from a point above the surface. Assume the ball collides each time with the floor inelastically. The quantity represented on the yaxis is the ball's (take upward direction as positive)

12 / 45

Consider a vector F = 4 i – 3 j. Another vector that is perpendicular to F is

13 / 45

The electric field at a distance r from the centre in the space between two concentric metallic spherical shells of radii r1 and r2 carrying charge Q1 and Q2 is (r1 < r < r2)

14 / 45

An aeroplane flying at a constant speed releases a bomb. As the bomb moves away from the aeroplane, it will

15 / 45

Two bodies of masses m and 4m are moving with equal kinetic energies. The ratio of their linear momenta will be

16 / 45

The P-V equation for a process of an ideal gas is given by

17 / 45

Heat is required to change 1 kg of ice of –20ºC into steam. Q1 is the heat needed to warm the ice from –20ºC to 0ºC, Q2 is the heat needed to melt the ice, Q3 is the heat needed to warm the water from 0ºC to 100ºC and Q4 is the heat needed to vaporize the water. Then

18 / 45

Which of the following waves have the maximum wavelength ?

19 / 45

Which of the following gates corresponds to the truth table given below?

A  B  Y
1  1  0
1  0  1
0  1  1
0  0  1

20 / 45

A current carrying wire in the neighbourhood produces

21 / 45

A radioactive sample at any instant has its disintegration rate 5000 disintegrations per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (per minute) is

22 / 45

Masses of 1 kg each are placed 1 m, 2 m, 4 m, 8 m,..... from a point P. The gravitational field intensity at P due to these masses is

23 / 45

The internal energy of an ideal gas increases during an isothermal process when the gas is

24 / 45

We have a galvanometer of resistance 25 Ω . It is shunted by a 2.5 Ω wire. The part of total current that flows through the galvanometer is

25 / 45

A cell of internal resistance r is connected to an external resistance R. The current will be maximum in R, if

26 / 45

The effective capacitance of combination of equal capacitors between points A and B shown in figure is

27 / 45

A pulley of radius 2 m is rotated about its axis by a force F = (20t – 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg-m2 the number of rotations made by the pulley before its direction of motion is reversed, is:

28 / 45

The sprinkling of water reduces slightly the temperature of a closed room because

29 / 45

The angular velocities of three bodies in simple harmonic motion are ω1, ω2, ω3 with their respective amplitudes as A1, A2, A3. If all the three bodies have same mass and velocity, then

30 / 45

Consider a thermodynamic system. If ΔU represents the increase in its internal energy and W the work done by the system, which of the following statements is true ?

31 / 45

Which one of the following is NOT a correct statement about semi-conductors?

32 / 45

The dimensions of angular momentum, latent heat and capacitance are, respectively.

33 / 45

A closed argon pipe and an open argon pipe are tuned to the same fundamental frequency. What is the ratio of their lengths?

34 / 45

The masses of the three wires of copper are in the ratio of 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistance is

35 / 45

Impedance of circuit when a resistance R and an inductor of inductance L are connected in series in an A. C. circuit of frequency n, is

36 / 45

Angle between magnetic meridian and geographical meridian is called

37 / 45

The radius R of the soap bubble is doubled under isothermal condition. If T be the surface tension of soap bubble, the work done in doing so is given by

38 / 45

The electric field associated with an e.m. wave in vacuum is given by E = î40 cos(kz - 6 x 108t),   where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is

39 / 45

The point charges Q and –2Q are placed at some distance apart. If the electric field at the location of Q is E. Then, the electric field at the location of –2Q will be

40 / 45

The maximum electric field that can be held in air without producing ionisation of air is 107 V/m. The maximum potential therefore, to which a conducting sphere of radius 0.10 m can be charged in air is

41 / 45

If the wavelength of the first line of the Balmer series in the hydrogen spectrum is λ, then the wavelength of the first line of the Lyman series is

42 / 45

A vessel of depth x is half filled with oil of refractive index μ1 and the other half is filled with water of refractive index μ2. The apparent depth of the vessel when viewed from above is

43 / 45

Heat energy absorbed by a system in going through a cycle process shown in figure is


44 / 45

Upper part of a prism is cut. The ray diagram of a ray incident at first refracting surface is as shown in figure. The minimum deviation that can be produced by the prism is

45 / 45

Light of wavelength 200 Å fall on aluminium surface. Work function of aluminium is 4.2 eV. What is the kinetic energy of the fastest emitted photoelectrons?

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