NEET Practice Test - 24 - NEET MCQ

If μ_r, μ_k and μ_s represent the coefficients of rolling friction, kinetic and static friction, then

A heavy stone hanging from a massless string of lengt 15m, is projected horizontally with speed 147ms^-1. Th speed of the particle at the point where the tension i the string equals the weight of the particle, is

Kirchhoff’s I and II laws are based on conservation of

A balloon with mass m is descending with an acceleration a (where, a < g) . How much mass could be removed from it, so that its starts moving up with an acceleration a?

​The work function of a metallic substance is 5 eV. The threshold frequency is approximately

Initial angular velocity of a circular disc of mass M is ω₁.Then, two small spheres of m are attached gently two diametrically opposite points on the edge of the disc. What is the final angular velocity of the disc?

What is the ratio of the shortest wavelength of the Balmer series to the shortest wavelength of the Lyman series?

Three blocks of masses 4 kg, 2 kg, 1 kg respectively are in contact on a frictionless table as shown in the figure. If a force of 14 N is applied on the 4 kg block, the contact force between the 4 kg and the 2 kg block will be

Use of eddy currents is done in the following except

If a body coated black at 600 K surrounded by atmosphere at 300 K has cooling rate r₀, the same body at 900 K, surrounded by the same atmosphere, will have cooling rate equal to

Consider the following statements and select the incorrect statement.

What is the value of inductance L for which the current is maximum in a series L-C-R circuit with C = 10_μF and ω = 1000s^-1?

At the centre of a cubical box +Q charge is placed. The value of total flux that is coming out a wail is

A body when fully immersed in a liquid of specific gravity 1.2 weight 44 gwt. The same body when fully immersed in water weight 50 gwt. The mass of the body is

According to the kinetic theory of gases, the pressure exerted by a gas on the walls is measured as

A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of 

The fundamental frequency of a closed end organ pipe is n. Its length is doubled and radius is halved. Its frequency will become nearly

In a vande Graaff generator, the voltage of a metallic spherical shell is 15 x 10⁵ V and electric field around the electrode is 15 x 10⁷ Vm^-1, then the minimum radius of the metallic spherical shell is

A particle moves such that its acceleration ‘ a ’ is given by a = - bx where x is the displacement from equilibrium position and b is constant. The period of oscillation is

A 120 W, 60 V bulb is to be operated on a 120 V DC supply. For this a resistor of resistance R is connected in series with the bulb. The value of R is

The magnetic field of earth at the equator is approximately 4 x 10^-5 T . The radius of earth is 6.4 x 10⁶ m. Then the dipole moment of the earth will be nearly of the order of:

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

A passenger travels along the straight road for half the distance with velocity v₁ and the remaining half distance with velocity v₂. Then average velocity is given by

Maxwell’s modified form of Ampere’s circuital law is

A solid cylinder of mass m & radius R rolls down inclined plane without slipping. The speed of its C.M. When it reaches the bottom is

In Young’s double slit experiment, the intensity at a point where the path difference is λ/6 (λ being the wavelength of light used) is I. If I_o denotes the maximum intensity  is equal to

Steam is passed into 22 gm of water at 20°C. The mass of water that will be present when the water acquires a temperatue of 90°C (Latent heat of steam is 540 cal/g) is