List of top Physics Questions

A thin lens is a transparent optical medium bounded by two surfaces, at least one of which should be spherical. Applying the formula for image formation by a single spherical surface successively at the two surfaces of a lens, one can obtain the 'lens maker formula' and then the 'lens formula'. A lens has two foci - called 'first focal point' and 'second focal point' of the lens, one on each side.
thinlens isatransparentopticalmedium
Calculate the Reynolds number for a liquid with density 1 g/cm³ and viscosity 8 × 10⁻⁴ Pa·s, flowing at 0.5 m/s through a pipe of diameter 4 cm.
Energy is not carried by
Of the various series of the hydrogen spectrum, which of the following lies wholly in the ultraviolet region?
Isotopes of an element have a different number of
The process of heat transfer in which heat is transferred with actual migration of medium particles is known as
If the radius of Bohr's first orbit is \( a_0 \), what is the radius of the \( n \)th orbit?
A gun of mass 1000 kg fires a projectile of mass 1 kg with a horizontal velocity of 100 m/s. The velocity of recoil of the gun in the horizontal direction is
NAND gate means
Which logic gate is represented by the following combination of logic gates?
logic gate is represented by the following combination of logic gates
The number of turns in the primary coil of a transformer is 200 and the number of turns in the secondary is 10. If 240 V AC is applied to the primary, the output from the secondary is –
On increasing the reverse bias to a large value in a PN junction diode, current
The output of the two-input OR gate is high
Photons and alpha particles have the same de-Broglie wavelength. What is the same for both of them?
An Astronomical Unit, or AU, is the average distance between
Displacement current is due to -
The isotope generally used for the treatment of cancer is -
In Young's double slit experiment, the central point on the screen is -
Which of the following materials is the most suitable for making a permanent magnet?
Cyclotron cannot accelerate
For which of the following is magnetic susceptibility negative?
Two sources of light are said to be coherent when both give out light waves of the same
What does the area under acceleration-time graph represent for any given time interval?
A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is \( B \). It is then bent into a circular coil of \( n \) turns. The magnetic field at the centre of this coil of \( n \) turns will be
Why can't the DC ammeter measure an alternating current?