NEET Physics | Daily MCQs Practice Questions | 26 July 2024 | NEET Exam

In the circuit, the forward resistance of each diode is 50Ω and the reverse resistance of each diode is infinite. Find the current through 20 Ω resistor :

A mercury drop of radius 1 cm is sprayed into 10⁶ droplets of equal size. Calculate the energy expanded if surface tension of mercury is 35 × 10^–3 N/m :

Two open pipes A and B are sounded together such that 2 beats are heard. Now A is closed beat frequency is still 2. What is the ratio of length's of pipe :

Sodium and copper have work function 2.3 eV and 4.5 eV respectively then the ratio of their threshold wavelengths is nearest to:

A body moves in a circular path of radius r = 500 m with tangential acceleration a₁ = 2 m/s². When its tangential linear velocity is 30 m/s, the total acceleration will be :

A slit of width 'd' is illuminated by light of wavelength 5000 Å. For what value of 'd' will the first maximum fall at an angle of diffraction of 30° :

The minimum angle of deviation is 30° by a hollow prism filled with liquid. Ray of light refracted at an angle 30° . The refractive index of liquid is :

A 5.5m long string has a mass of 0.035 kg. If the tension in the string is 77N, then the speed of a transverse wave on the string is :

In the circuit shown, the heat generated in the 5Ω resistor due to current flowing through it is 10 cal/sec. The heat generated in the 4Ω resistor is :

The equation of SHM is $\mathrm{y}=\mathrm{a\; sin}\left(2\mathrm{\pi nt}+\mathrm{\alpha }\right)$ . then its phase at time t is:

The driver of a three-wheeler moving with a speed of 36 km/h sees a child standing in the middle of the road and brings his vehicle to rest in 4.0 s just in time to save the child. What is the average retarding force on the vehicle ? The mass of the three-wheeler is 400 kg and the mass of the driver is 65 kg:

The stress versus strain graphs for wires of two materials A and B are as shown in the figure. If Y_A and Y_B are the Young's modulii of the materials, then :

A spherical ball of radius 3.0 × 10^–4 m and density 10⁴ kg/m³ falls freely under gravity through a distance h before entering a tank of water. If after entering the water the velocity of the ball does not change, final h will be. Viscosity of water is 9.8 × 10^–6 N-s/m² :

The density of air at pressure of 10⁵ N/m² is 1.2 kg/m³ under these conditions the V_rms of the air molecules in m/s is:

Three conducting rods of same material and cross-section are shown in figure. Temperature of A, D and C are maintained at 20°C, 90°C and 0°C. The ratio of lengths of BD and BC if there is no heat flow in AB is:

Given below are two statements :

Assertion I: The Bohr model is applicable to hydrogenic atoms. It cannot be extended to even two electron atoms such as helium

Reason II : The formulation of Bohr model involves electrical force between positively charged nucleus and electron. It does not include the electrical forces between electrons which necessarily appear in multi-electron atoms.

 In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements :

Statement I: The nuclear force does not distinguish between neutron and proton.

Statement II : Energy associated with nuclear processes are about a million times larger than chemical process.

In the light of the above statements, choose the most appropriate answer from the options given below :

Figure shows a rectangular conductor PQRS in which conductor PQ is free to move assume there is no friction and Magnetic field is uniform inward the plane of paper resistance of:

Statement I: If rod PQ is projected towards right with speed v = v₀ at t = t₀ it will move with uniform speed afterwards.

Statement II : There will be a constant current in Loop PQRS.

In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements :

Statement I: For an ideal gaseous system work is done by the gas in an adiabatic process if gas is cooled.

Statement II : The heat absorbed by the gas goes entirely to change its internal energy and its temperature.

 In the light of the above statements, choose the most appropriate answer from the options given below :

The distance between two rails is 1.2 m. The centre of gravity of the train is at a height of 2 m from the ground. The maximum safe speed of the train on the circular path of radius 150 m is :