List of top Physics Questions

In refraction, light waves are bent on passing from one medium to the second medium, because, in the second medium:

According to Bernoulli's equation $\frac{P}{\rho g}+h+\frac{1}{2} \frac{v^{2}}{g}=$ constant The terms $A, B$ and $C$ are generally called respectively :

A wire mesh consisting of very small squares is viewed at a distance of $8 \,cm$ through a magnifying converging lens of focal length $10\, cm$, kept close to the eye. The magnification produced by the lens is

A wire is cut into four pieces, which are put together by sides to obtain one conductor. If the original resistance of wire was $ R $ , the resistance of the bundle will be:

A uniform rod of length $\ell$ and mass $m$ is free to rotate in a vertical plane about $A$. The rod initially in horizontal position is released. The initial angular acceleration of the rod is (Moment of inertia of rod about $A$ is $\frac{m \ell^{2}}{3}$ ):

When sound waves travel from air to water, which one of the following remains constant?

If $a_{r}$ and $a_{t}$ represent radial and tangential accelerations, the motion of a particle will be uniformly circular if:

Consider the following equation of Bernoulli's theorem. $P+\frac{1}{2} \rho v^{2}+\rho g h=K \text { (constant) }$ The dimensions of $K / P$ are same as that of which of the following ?

An $L-C$ circuit is in the state of resonance. If $C=0.1\, \mu F$ and $L=0.25\, H$, neglecting ohmic resistance of circuit, what is the frequency of oscillations?

A forward biased diode is :-

Which of the following statements is incorrect?

Which of the following statements is incorrect ?

Which one of the following is not a derived unit ?

A body initially at rest is moving with uniform acceleration $a$. Its velocity after $n\, s$ is $v$. The displacement of the body in $2\, s$ is :

The first diffraction minimum due to single slit diffraction is $ \theta $ , for a light of wavelength $5000\,?$. If the width of the slit is $ 1\times 10^{-4}, $ then the value of $\theta$ is :

The magnetic force on a point charge is $\vec{ F }= q (\vec{ V } \times \vec{ B })$ Here, $q=$ electric charge $\vec{ V }=$ velocity of point charge $\vec{ B }=$ magnetic Held The dimension of $\vec{B}$ is :

A velocity of a particle at an instant is $10\, m / s$. After $3\, s$ its velocity will become $16\, m / s$. The velocity at $2\, s$, before the given instant will be :

Two stones are projected with same velocity $v$ at an angle $\theta$ and $(90-\theta)$. If $H$ and $H_{1}$ are the greatest heights in the two paths, what is the relation between $R , H$ and $H_{1}$ ?

A particle moves with a velocity $(5i -3j + 6k) ms^{-1}$ undre the influence of a constant force $F=(10 i +10 j +20 K)N .$ The instantaneous power applied to the particle is

A weight $w$ is suspended from the midpoint of a rope, whose ends are at the same level. In order to make the rope perfectly horizontal, the force applied to each of its ends must be:

The energy spectrum of $\beta$-particles [number N(E) as a function of $\beta$-energy E] emitted from a radioactive source is :

In a series resonant $LCR$ circuit, the voltage across $R$ is $100$ volts and $R = 1\,\Omega$ with $C = 2\mu F$. The resonant frequency $\omega$ is $200$ rad/s. At resonance the voltage across $L$ is :

In a common-base mode of a transistor, the collector current is 5.488 mA for an emitter current of 5.60 mA. The value of the base current amplification factor ($\beta$) will be :

A string is stretched between fixed points separated by $75.0\, cm$. It is observed to have resonant frequencies of $420\, Hz$ and $315\, Hz$. There are no other resonant frequencies between these two. Then, the lowest resonant frequency for this string is :

Which of the following units denotes the dimensions $[ML^2/Q^2],$ where $Q$ denotes the electric charge ?