Physics NEET Daily MCQs Practice Questions | 1 August, 2024

The power factor of circuit is $1\sqrt{2}$. The capacitance of the circuit is equal to :-

A parallel plate capacitor is connected to a battery as shown in figure. Consider two situations:

A:  Key K is kept closed and plates of capacitors are moved apart using insulating handle.
B:  Key K is opened and plates of capacitors are moved apart using insulating handle.

Two bodies of masses 5 kg and 1 kg are moving with velocities $2\hat{i} - 7\hat{j} + 3\hat{k}$ and $-10\hat{i} + 35\hat{j} - 3\hat{k}$ m/s respectively. The velocity of the centre of mass of the two-body system is:

There is a current of 40 amperes in a wire of 10^-6 m² area of cross-section. If the number of free electrons per m³ is10²⁹ , then the drift velocity will be

A meter bridge set up with null deflection in the galvanometer shown below in the figure. The length of uniform wire of resistor R is 3.14 m and its measured diameter is 0.2 mm. Find resistivity of resistor R :

If electric field in a non-magnetic medium for E.M. wave is given by

$\vec{E} = 1200 \sin \left( 10^8 t + \frac{Z}{3} \right) \hat{j} \text{ V/m}$

then $\vec{B}$ is:

Figure shows two equipotential lines in xy-plane for an electric field. The x-component E_x and  y-component E_y of the electric field in the space between these equipotential lines are, respectively-

Altitude at which acceleration due to gravity decreases by 0.1% approximately : (Radius of earth = 6400 km)

A particle moving with constant acceleration covers a distance of 30m in the 3rd second. It covers a distance of 50m in the 5th second what is the acceleration of the particle :

A long solenoid has 200 turns per cm and carries a current i. The magnetic field at its centre is 6.28 × 10^-2 weber/m² . Another long solenoid has 100 turns per cm and it carries a current i/3. The value of the magnetic field at its centre is :-

Consider a bar magnet having pole strength 4 A-m, magnetic length 8 cm and area of cross-section 1 cm$^2$. Then the intensity of magnetization $I$ is:

The human eye can nearly detect a yellow light (6000 Å) that delivers $1.7 \times 10^{-18}$ watt to the retina. Nearly how many photons per second does the retina receive:

The work function of a metal is 2.5 eV. If a radiation of wavelength 4000 Å falls on it, the maximum kinetic energy of emitted photoelectrons is:

The de-Broglie wavelength of a particle accelerated with 150 volt potential is $10^{-10}$ m. If it is accelerated by 600 volts, its wavelength will be:

Consider an electron in the n^th orbit of a hydrogen atom inthe Bohr's model. The circumference of the orbit can be expressed in terms of the de-Broglie wavelength λ of that electronas :-