NEET Practice Test - 5 - NEET MCQ

A uniformly wound solenoidal coil of self-inductance 1.8×10−4 H and resistance 6 Ω is broken up into two identical coils. These identical coils are then connected in parallel across a 15 V battery of negligible resistance. The steady-state current through the battery in ampere is

A piece of metal weighs 45 g in air and 25 g in a liquid of density 1.5 x 10³ kg-m^-3 kept at 30°C. When the temperature of the liquid is raised to 40°C, the metal piece weighs 27 g. The density of liquid at 40°C is 1.25 x 10³ kg-m^-3. The coefficient of linear expansion of metal is

Two radioactive materials X₁ and X₂ have decay constants 10λ and λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X₁ to that of X₂ will be 1/e after time

A particle is released from rest from a tower of height 3h. The ratio of time taken to fall equal heights hh i.e., t₁ : t₂ : t₃ is

An impulse J is applied on a ring of mass m along a line passing through its centre O. The ring is placed on a rough horizontal surface. The linear velocity of centre of ring once it starts rolling without slipping is

The rms value of the electric field of the light coming from the Sun is 720 N C⁻¹. The average total energy density of the electromagnetic wave is

Three identical blocks of masses m = 2 kg are drawn by a force F = 10.2 N on a frictionless surface, then what is the tension (in N) in the string between the blocks B and C?

A metallic square loop ABCD is moving in its own plane with velocity V in a uniform magnetic field perpendicular to its plane as shown in the figure. EMF is induced

What is the relation between the refractive indices μ₁ and μ₂? If the behaviour of light rays is as shown in the figure.

In Young's double slit experiment, the 10th maximum of wavelength λ₁ is at a distance of y₁ from the central maximum. When the wavelength of the source is changed to λ₂, 5th maximum is at a distance of y₂ from its central maximum. The ratio y₁/y₂ is

Young's modulus of steel is 19 × 10¹⁰ N/m². Express it in dyne/cm². Here dyne is the CGS unit of force.

Ionisation potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. The spectral lines emitted by hydrogen atoms according to Bohr's theory will be

The unit of permittivity of free space is

Choose the incorrect statement.

Three capacitors C₁ = 3 μF, C₂ = 6 μF and C₃ = 12 μF are joined in series. This series combination is connected to a 14 volt source. The P.D across the plates of capacitor C₂ is

In the circuit shown below, C₁ = 3 μF ; C₂ = 6 μF ; C₃ = 6 μF ; C₄ = 12 μF and C₅ = 9 μF. The total energy stored in these five capacitors is

In the circuit shown, R₁ = 10 Ω; R₂ = 20 Ω; R₃ = 30 Ω and R₄ = 20 Ω. Potential difference between b and d (V_b - V_d) is

For the circuit shown below, when the switch S is closed, then the total amount of charge that flows from point a to point b through the switch, is

In the infinite ladder network shown below, if R = 1.235 Ω, then the effective resistance between the points a and b (approximately) is (√5 = 2.235)

In the circuit shown below, if the tap key K is pressed at time t = 0, then which of the following statements is false?

The electrostatic field lines

The electric field decreases most rapidly, with distance for

Eight identical spherical liquid drops each charged to potential of 2 volt. They coalesce to make one big spherical liquid drop, whose potential is

A uniform electric field of 50√2 Vm^-1, exists in XY plane, making an angle of 45° with positive X axis as shown in below figure. The potential difference [V_A - V_B] is

A point charge Q is located at a distance R/2 From the centre of an uncharged conducting spherical shell as shown in below figure. The electric field at a distance 3R from the point charge is

In the circuit shown, the effective resistance between the points a and b is

In the circuit shown, the effective resistance between the points a and b is